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HP Key Notes Vol 8 No 2

1. Calculation for Cryogenic Proces sing and Calculation for Head Loss and Cen trifugal Pump Douglas L Pearson M D for his Medical Dental Service Business Revenue Analysis John L Gilby for his 41 82905B Word Processor Patrick Imbimbo for his DCOMP And last but certainly not least Lewan Associates of Pueblo Colorado also won an HP 75 for being the HP Dealer through whom Douglas Pearson submitted his winning pro gram Congratulations once again and enjoy those fantastic HP 75s Page 2 KEY NOTES V8N2 Aug 83 About Orders And Postage If you order anything listed in KEY NOTES or in the Library Catalog and you live outside the U S and Canada be sure to make your payment in U S dollars It is also far better to use checks or money orders drawn on a U S bank and please make sure your paymentaccom panies your order This small action can save you much time on delivery and prevent many headaches Because of postage and packaging costs for overseas shipments we impose a 10 surcharge on all orders sent to addresses outside the U S and Canada Again in order to speed delivery be sure you add the overseas 10 surcharge to the total price of your order This does not apply for Solutions Books purchased from the Corvallis Users Library they require only the normal 3 50 postage and handling charge levied for all Solutions Books purchased from the Library Also if you are u
2. e ep O HEWLETT PACKARD L STO RCL Featuring this last issue Neither Snow Nor Rain Nor 2 Where Do Go From Here 2 The HP 41 and PPC 4 Years Later 3 Can an HP 41 Change Your Life 4 Book Reviews 5 More HP 75 Software Released T HP 75 Math Pac Review 7 Can Handhelds Aid High Technology 8 HP IL Acoustic Coupler Introduced 10 Graphics for the HP 75C 11 Routines Techniques Tips Etc 11 Third Part Hardware 13 Old Soldiers Never Die 15 August 1983 Vol 8 No 2 HP key Notes Published Quarterly By Subscription 5 yr 2 00 My Last Editorial If you have ever received a letter from me you know I like to use a friendly informal personal touch And since this is the last time I shall write to all of you Pll make it friendly informal and once again personal A long time ago I lost count but I am certain that there are well over 2 million copies of KEY NOTES scattered far and wide across this planet Earth For me they represent more than just over 30 million pages to which I have put my hand and name To me they represent a legacy you have given to me rarely does anyone every destroy a copy of KEY NOTES That is quite a compliment and I shall forever cherish it Thank you every one of my loyal readers It s been quite an interesting time In the past 94 years of producing KEY NOTES quite a large number of you have asked me Why do
3. 12 GTO a2 26 TONE 8 13 KO 2 27 EXD 14 RDN And now one more problem this one from VTN pdb The original routine was sub mitted by Ed Keefe who did send me a much better version last week However I think it pertinent that we point out why the original didn t work properly Heres a fix from Donald Beaty who is in the Department of Physics at the College of San Mateo in San Mateo California 41 Ed Keefe s base translation routine pub lished in KEY NOTES for January March 1983 V7N1 has an important defect When convert ing from HEX to DECIMAL some values are processed incorrectly For example converting 7 to decimal yields a Converting 8DDB to decimal results in 7643 rather than the correct value of 36315 With the added steps below the program works correctly and is quite useful a 38 13 GTO 87 BB KY 144LBL 86 a9 GTO 86 15 RIH 1 RDN 16 48 is 17 AOD 12 MOD 18 LBL 87 Mr Beaty also included a very friendly and very neat routine he often uses for transla tions I wish I had more space Now here s one for you to figure out I ve done most of the work for over 9 years but this time I leave the work to you If the above fix works think about the next letter It is my last problem for you Ed Here s another fix for the above problem It s from Peter Galvin of the Weslyan Univer sity Computing Center in Middleton Con necticut 41 The XD r
4. cients this function alone justifies the cost of the ROM Both real and complex zeros are found in order of increasing magnitude given as complex entries in a complex matrix used this function to locate the zeros of the Lengendre polynomials and checked the answers against the 15 place tables in the National Bureau of Standards Handbook and found every solution accurate within one digit in the last place This is indicative of the mathematical performance of the HP 75 Math ROM The two functions called FNROOT and IN TEGRAL were innovative when introduced on the HP 34C calculator FNROOT will find a zero of any equation in the form f x 0 If no solution exists FNROOT will find the next best thing The INTEGRAL function will find the definite integral of f x over a finite interval These two functions are improved in the HP 75 Math ROM Both FNROOT and INTEGRAL allow the user to specify a tolerance factor for the function f x Thus the accuracy of the solution can be made to match that of f x If you haven t used a num erical integrator or root solver before you ll ap preciate the power provided by these two func tions that solve certain problems that can only be solved by numerical methods If you have been using functions similar to these you ll ap preciate the speed and increased precision of the HP 75 For many users FNROOT and IN TEGRAL together with SYS will be the most often used functions in the ROM The FOUR k
5. professional on the go By inserting simple commands throughout the text the copy is automatically formatted when printed margins paragraphs pagina tion headings and justification all to the user s specifications A help file is provided for reviewing all commands and their functions and a custom overlay highlights redefined keys that can be used as typing aids Additional features include a distribution list function merge file and slide command With the distribution list capability docu ments are easily customized names addres ses etc can be inserted automatically at pre determined lines The Merge file feature allows the user to insert often used text in letters facilitating the production of form letters Letter size and slant can be adjusted with the slide command for plotting on the HP 7470A Plotter on either paper or acetate for overhead transparencies HP 75 SURVEYING PAC The HP 75 Surveying Pac 00075 15012 is a portable tool to aid surveyors and engineers in solving many common surveying problems The pac consists of one integrated program rather than a collection of individual rou tines that provides a versatile and sophisti cated tool for use in the field Traverse inverse curve layout and radia staking calculations are made easily and quickly The unique data entry system allows you to select one of a variety of input modes regardless of the output mode desired If en tries are u
6. skilled work and is very labor intensive but when you want to put more software in your machine this trick helps Some people will even modify HP 41s to speed them up wire modules inter nally etc This of course voids HP s warranty am only reporting on what many users are doing with their HP 41s The HP 41 system is strongly supported by Hewlett Packard The Extended Modules give more memory and more functions especially those dealing with Alpha handling The Ex tended Functions Module for example is one of the most important modules a user can have in his or her machine Another universal module is the Time Module Having automatic time and date is a feature that once you get used to having you wonder how you got along without it These modules add power to the HP 41 but the real powerhouse is the HP IL Module The HP IL Module allows the HP 41 to be a controller in an HP IL loop This is necessary for such items as the HP 82161A Digital Cassette Drive and the HP 82162A Thermal Printer When average people look at HP IL and all the modules available for the HP 41 they may believe that the HP 41 has an infinite capacity to absorb money there is so much that you could spend money on But that is the beauty of the system You may expand your system as your needs and skills grow Why would you buy a machine that couldn t do what you want it to do With the right hardware and software you can make the HP 41 do just a
7. 41C After a short demonstration was speechless More importantly when asked him to rate his selection he stated very simply There is nothing like an HP anywhere for any price The price was beyond a writer s means but began saving everywhere could The incredi ble beauty and power of the 41C and the loy alty of its owners rejuvenated my interests in technology and made up my mind to go back to school wae 6 a I now have a 41C a degree and 20 credits toward a Masters in Computer Science with a 3 8 average left the writing job and have re cently been hired as a Computer Consuitant to Yale University and an EDP Auditor for the same company Salesman Writer Computer Consultant Thank you gentlemen for a new career With the family growing doubt if I ll get the many accessories for a few years but for right now the 41C keeps me more than happy Hewlett Packard will always have a very spe cial place in my life and assure you that you will never be without at least one East Coast spokesman Keep up the great work Sincerely Richard Dorozenski Waterbury Connecticut A FINAL NOTE ON A KEY PERSON As Henry indicated in his edito rial this is his last issue as Editor of Key Notes Over the past 9 years he has provided a valuable two way channel of information between those who make Hewlett Packard products and those who use them Henry s belief that any Page 16 KEY NOTES
8. Definite integrals Finite Fourier Transform These functions are provided as a set of BASIC statements or keywords With the Math Pac ROM plugged into the HP 75 these keywords are instantly available to be used in programs or may be executed directly in calculator mode The ROM is coded in machine language ensuring optimal numeric accuracy reliabil ity and speed The HP 75 Math Pac began shipping in June wtih a U S list price of 145 00 U S dollars See note at bottom of cover HP 75 Math Pac Review If you read KEY NOTES cover to cover you know about the new Math Pac for the HP 75 We are pleased that we have permission from PPC see article elsewhere in this issue to print this review of our new pac it was written for the Computer Journal of PPC by John Kennedy a Director on the Board of PPC And because we think very highly of this new pac we are very glad to see that an expert agrees with our assessment A short biog raphy on John Kennedy follows the article The HP 75 Math Pac ROM plugs into any one of the three ports on the HP 75 and acts as a language extension file that adds many mathe matically sophisticated keywords to the BASIC language More precisely the 16K Advanced Math ROM adds 89 new keywords to the already powerful HP BASIC The following is a list of a few of the more significant capabilities tunctions in the ROM 1 Rounding and truncation to any specified place value 2 Hyperbol
9. RTH B8 FE 39 16 END From South Carolina let s travel far north to Lively Ontario Canada to the home of Sean M Hill and his HP 41 His contribution is short but useful 41 In one of my HP 41 programs needed to clear the stack and LASTX but preserve a number in the X register The following routine labelled KEEPX does the trick GL LBL KEEPS 2 Re 83 ELST a4 so L 05 RTH A END If you own an HP 41 with a card reader and do a lot of calculating in a program and use only the stack this tip will help you keep track or keep stack of what you are doing Just prior to a portion of your program where you are doing a lot of stack manipulation place a 7PRSTK When program execution reaches this line the stack will be reviewed for you and you can tell if your data is in the correct position s for your following manipulations After your program is debugged you can delete all the 7PRSTKs to save memory and speed execution That 7PRSTK is explained in the card reader manual Print stack HP 67 97 compati bility function If printer is attached prints the contents of T Z Y X If no printer views the contents If printer is not present or disabled stack lift is enabled Ed Overseas in M hlacker West Germany there is an HP 41 that holds a Time Module but does it keep Erwalt Philipp on time Let s see 41 For more than ten years have been an RPN fan and want to thank you very much for t
10. TIMER 2 01 OFF TIMER 2 50 BYE The timer wakes us up here Send the CLEAR LOOP until it makes it around the loop 60 ON ERROR GOTO 70 70 CLEAR LOOP 80 DISP loop up HP 75 AUTOLOOP Program Makes Looping Easy Let s face it it is easier to automatically assign peripherals in the HP IL loop than to do it manually each time That s why you ll like this new Library program AUTOLOOP is a language extension LEX file that automatically performs an ASSIGN IO when the HP 75 is turned on All HP IL devices connected to the HP 75 are assigned predetermined device names and the first display and printer devices are automatically made into DISPLAY IS and PRINTER IS de vices AUTOLOOP therefore greatly simpli fies the process of being able to assign and use peripheral devices since all you have to do is simply turn on the HP 75 The AUTOLOOP magnetic card also pro vides an auto start capability that allows the user to define a series of commands such as RUN PROGNAME that will be executed when the HP 75 is turned on The program number is 75 0104 the size is 1 track of a magnetic card the price is 10 and availability is September 1 1983 U S dollars See note at bottom of cover Page 10 KEY NOTES V8N2 Aug 83 HP IL Acoustic Coupler Introduced The ability to perform HP IL based data communications over voice quality telephone lines has been realized with the introduction of the HP 82168A Aco
11. again be providing a prompt turn around for all requests And remember all orders telephoned directly to the Users Li brary are shipped the same day The 20 Library membership fee 35 out side the U S and Canada entitles members to The Programmer s Reference Guide 10 2 HP 41 Solutions Books 25 2 Series 40 Catalog Issues 10 TOTAL 45 You have to admit that this is still one of the best buys you can find HP 41 Structural Design Solutions Book is excluded from this offer SERIES 70 USERS LIBRARY NEWS Complimentary memberships in the Series 70 Users Library are still being sent to every customer who returns the We Need Your Help questionnaire included in the HP 75 boxes Membership includes a catalog of avail able programs with a documentation guide two sets of program submittal forms and one Users Library program These members will also receive future information about the Series 70 Library USERS LIBRARY PROGRAM SUBMITTAL CONTEST WINNERS ANNOUNCED Congratulations to the Grand Prize Win ners of the HP 75 Portable Computers But before you read their names we want to thank each one of you who so enthusiasti cally promoted the Contest You nearly buried us in paper and although this caused a huge backlog we are sure that in the long run everyone will profit from a lot of excellent submittals The Grand Prize Winners are Jen Chien Jeffrey Huang for his pro grams
12. from PPC Dictionary 2545 West Camden Place Santa Ana CA 92704 U S A Note Make sure for all the above books that you include in your remittance any state or local taxes you are required to pay Failure to do so may cause a long delay in receiving your purchase Make sure also that all pay ments are in U S dollars it is far better to use checks drawn on a U S bank Ed More HP 75 Software Released If you own the new HP 75C Portable Com puter you will want to read through the fol lowing announcements and then visit your local HP Dealer for a demonstration or for further information HP 75 VISICALC The new 00075 15014 HP 75 VisiCalc pro vides you with a truly portable electronic worksheet that is more powerful than many desktop versions With it you may identify and define column row headers as wel as call data from one worksheet to another in mem ory and then use it in calculations Applications for HP 75 VisiCalc vary in cluding Finance Analyze stock and bond portfolios organize rental property records Business Calculate break even points and income analyze cash flow planned expenses and professional service fees compute de preciation Sales Calculate sales vs overhead and re tail markup forecast sales Statistics Analyze tabular data gathered in the field Science Engineering Perform experimen tal data reduction and engineering design analysis Especially
13. fuel or home heat ing oil It is being developed by a research team named Sea Labs Inc in Bellevue Wash ington Dave Stedman is a vice president of the firm Combustion efficiencies exceeding 85 have been attained by this microproces sor controlled burner Configured in the small size of the develop ment test unit shown in the photos the 10 000 BTU hr burner consumes only 290 milliliters less than of a quart of diesel fuel per hour and in this size it is suitable for heating mod ern small energy efficient housing or trailer type housing It is also suitable for augmenta tion of solar home heating electric heating and heat pumps Using a 12 volt power sup ply the small unit can heat live on board boats sail or fishing boats and cabin cruisers In larger sizes the design provides a far more efficient oil burner for home heating furnaces Evolution of the burner began in 1979 when a member of the Sea Labs team was involved in marketing a kerosene burning heater for boats Service problems that developed when the heater was fueled with anything but high quality illumination kerosene resulted in the start of a search for solutions A team of spe cialists in the technologies involved was as sembled and that team became Sea Labs Inc Designs were developed that would operate satisfactorily on all grades of kerosene but it became apparent that a burner that would digest diesel fuel efficiently would have broader ap
14. manual for this unusual ROM is an abso lute work of art easily worth the price of the ROM itself The list of routines some using Synthetic Programming in this outstanding 8K ROM would require an entire page Well over 8 000 of these ROMs have been sold worldwide But there s more to PPC than journals and ROMs and a Center If you have been a steady reader of KEY NOTES you will recog nize the desire that other readers have to just discover what others are doing with their per sonal computation products It is the camaraderie of the PPC members then that makes it work as an information gathering and disbribution service that is incomparable Members know each other and help each other There is a free flow of ideas and knowl edge and everyone learns from the whole of the entire group Although I am the editor of this company newsletter I am also a long time member of PPC having been given member number 2001 long before the membership ever came near that total probably because of my out of this world prediction about eventual mem bership I have watched PPC struggie through some difficult times and I have of fered a helping hand on many occasions Many of you who read KEY NOTES also are PPC members and I have been privileged to know you through that association And since this is my last KEY NOTES see Editorial I want you to know that there is at least one alternative That is why
15. must be in U S dollars Send only money orders or checks which must be drawn on a U S bank Pay ments must include stated postage and hand ling Allow up to 5 weeks for delivery DATA PROCESSING ON THE HP 41C CV written by William C Phillips is a new 147 page spiral bound book in 8 5 by 11 inch format 21 6 x 28 cm recently published by EduCALC Publications This book is actualy Volume 1 of a series on data processing on the HP 41C CV It is more appropriately Fundamentals of Program De sign and File Processing The book opens with some basic surveys of HP 41 hardware RPN and simple programming Then the au thor leads you into the real meat of this book the structural techniques of program design When you have absorbed and mas tered that File Creation and File Processing are explained The book winds up with a study of two large programs and they are studied in detail as examples of what the book is all about The programs are not only excellent examples but also very useful as the basis for your own cash register and running inventory setup in your business This book assumes that you are familiar with the basic commands for the HP 41C CV and that you know how to program it It also assumes that you have more than a basic HP 41 although it is still very useful if that s all you own The author William C Phillips is currently employed at Plan Services Inc a Dunn and Bradstree
16. this article is titled Where Do I Go From Here with Here meaning KEY NOTES I cannot officially sanction PPC but after a 9 year personal assocation with them I certainly can recom mend that you look into PPC as an alternative to KEY NOTES However you can decide for yourself For more information about PPC and a sample issue of the club s newsletter send a self addressed large folded envelope 9 x 12 inches 23 8 x 30 5 cm with first class postage for 2 ounces 56 7 grams to PPC Dept KN 2545 West Camden Place Santa Ana California 92704 U S A If you live out side the U S make sure you include a legible address label and international postal coupons for 56 7 grams 2 ounces A letter is not necessary and will only slow the response Note PPC is not sponsored nor in any way officially sanctioned by Hewlett Packard Co Ed PPC isa registered trademark of the Personal Programming Center Incorporated The HP 41 and PPC 4 Years Later A long time ago in V6N4 I promised to you an article from Richard J Nelson founder and President of PPC see article else where in this issue and editor of the two PPC journals I am very pleased to be able to print that promise in this my last issue of KEY NOTES It is a follow on to his original im pression of the HP 41 when we released that machine in 1979 V3N3 and it is an interest ing history of PPC s interface with the HP 41 system
17. to automatically After extensive development and test work by the Sea Labs team of engineers ther modynamicists and microprocessor control design personnel a simple reliable design re quiring few critical parts has evolved The unit burns the fuel cleanly to a new high level of thermal efficiency offering high reliability and long component life This design is contin uing to undergo further testing for materials evaluation packaging improvements relia bility and long term operational capability As you can see in the photos personal com putation devices such as the HP 41 and the HP 75 along with the use of HP IL measure ment devices and transducers really can be used to not only instigate high technology research but also form the basis for develop An overall shot of the development test setup That s the HP 3421A Data Acquisition Con trol Unit in the center The prototype furnace at right Here s a close up of the HP 75C doing some data acquisition chores and monitoring the preheat phase Temperature and time are dispiayed on the TV monitor ment tools monitoring facilities and output data collectors and interpreters These small computers can also handle the tasks of debugging and of establishing parameters As controllers they also permit easy and accu rate dynamic change capabilities when deal ing with the thermal characteristics that were being researched in this application Even t
18. DL type devices allow 4 8 or 16K of RAM Random Access Memory to be added to the HP 41 This type of memory re quires special programs to transfer MCODE machine code into and out of memory They are much like extended memory These devices are used to develop MCODE and run user writ ten MCODE MLDL is short for Machine Lan guage Development Laboratory Software for the HP 41 is as diverse as you can imagine Everything from ultra sound mea surements of the unborn to landing the Space Shuttle has been programmed for the HP 41 One of the newest topics is Data Processing on the HP 41 and there are several books now available or soon to be released In many of the books these programs are available in bar code cassette tape and in some cases magnetic cards The cost of HP 41 commercial software is in the range of 5 to 15 of machine cost There are thousands of free programs avail able from the articles mentioned above All this is in addition to HP s Library Pacs and ROMs There are many custom ROMs available cover ing everything from stock market analysis to hydraulics Page 4 KEY NOTES V8N2 Aug 83 Accessories include carrying cases magnetic card holders programming forms and even special battery holders One of the most interest ing items that group in this category is multiple modules in one package There are people who open modules and rewire up to two additional modules into the same case This requires
19. Here When the KEY NOTES newsletter was dis continued late in 1982 and ever since then people asked me What else is there for us Well as far as HP calculators and handheld computers are concerned the only source of information other than KEY NOTES is dis pensed by PPC an independent user s club headquartered in Santa Ana California and having branches or chapters all over the United States and the rest of the world PPC or as it is now known Personal Pro gramming Center was founded by Richard J Nelson in June 1974 He first edited and published a newsletter called 65 Notes and it pertained largely to the first programmable HP machine the HP 65 Since then PPC has grown and grown and today there are 5 300 active members worldwide and it continues to grow Recently the club became a not for profit corporation registered in the state of Califor nia and they have their own board of mana gers and so on Richard J Nelson the founder is still the editor and he is also the club s president and main motivating force They now print both the PPC Calculator Journal and the Computer Journal of PPC PPC is dedicated to gathering and dis seminating users information related to per sonal programming As noted above these activities cover both personal calculators and personal computers and each has its own reg ularly published Journal PPC also serves the need for timely information related to the se
20. I think you will like what he has to say Ed Richard J Nelson also alias Ed In the August 1979 issue of HP KEY NOTES had an opportunity to describe my reactions to the newly introduced HP 41 Now have an opportunity that is very unusual get to report on the same subject four years later First some background When the HP 65 was introduced in January 1974 was one of many thousands of customers who became dedi cated users In fact became so involved that started a club for such users it was called the HP 65 Users Club edited and published a newsletter that described what other dedicated users were doing with their machines That was in June 1974 Much has happened in the last nine years We have seen the HP 67 and HP 97 improve on the HP 65 and the HP 41C further improve on those models The HP 65 Users Club is now called PPC and has grown to 5 300 members in 55 countries and with over 50 local chapters We edit and publish two Jour nals one dedicated to programmable cal culators and one to personal computers PPC has over 3 000 square feet of space dedicated to a library museum computer center and pub lication production space We are the oldest non commercial personal computer users group We are independent and supported by our membership The purchase of an HP 65 nine years ago has certainly changed my life PPC is now legally known as the Personal Programming Center an
21. U S dollars or a check drawn on a U S bank please Ed Page 12 KEY NOTES V8N2 Aug 83 If you are interested in column formatted printer outputs but do not have the HP 82180A Extended Functions Memory Module this input by Ken Dawson of Alpine Califor nia is for you 41 Here is a subroutine often use to pro vide a column formatted printer output without the X Functions Module This routine is 22 bytes shorter than the routine submitted by Mr Vas allo in V6N4p11a and it permits the sign to precede the printed value rather than placing it in a trailing position BLeLBL CPX AS Kea 82 STO Z a9 CTO 84 Q3 LBL 86 18 RIN 84 BSE Y 11 SKPCHR 85 18 12 RDH B 7 13 RCX 07 INT 14 RTN To use the routine place the desired number of spaces to the left of the decimal point in the Y register the value to be printed in the X regis ter and then XEQ CPX This procedure should be repeated until the desired number of columns has been generated at which point the PRBUF or ADV commands should be given Are you a TV fan Do you try all the many programs now available via cable and or satel lite Then you ll want to try this routine from Robert D Lowmaster who watches TV in Palmerton Pennsylvania 41 Maybe some of your readers may find this routine useful if they have or plan on getting an earth station The routine computes the look azimuth and elevation angle to any domestic satellite The factor on line 30 is
22. V8N2 Aug 83 one can learn to program Hewlett Packard programmable calculators resulted in a publica tion that has been informative stimulating and fun As Henry retires from Hewlett Packard I m sure you ll join me in thanking him for his many years of dedi mpi cated service to both HP and it s customers and wish him every success in his future efforts Dan Terpack General Manager Portable Computer Division
23. and I thought it ap propriate to tell you about Henry s demise And yes we gave Henry a proper and decent retirement Ed KEY NOTES V8N2 Aug 83 Page 15 We Get Letters The following letter as sent to our Company headquarters in Palo Alto California As you can see it is addressed to the two founders of this Company I ve had it since March of 1982 but never had the space to print it In this last issue of KEY NOTES however I think it fit ting that it appears here To Bill Hewlett and Dave Packard THANKS felt you might like to know that one of your products literally changed the course of my life before actually owned it Originally a Physics major in college left prematurely because of a death in the family Without that degree struggled through several jobs unfulfilled and unmotivated Finally landed a job writing for a daily paper While covering a news story at a local pawn shop began a conversation with a young engineering student who happened to be looking for a used HP calculator He told me that it was a futile effort because no one ever parted with an HP calculator really didn t know what he was talking about but it sparked my interest came from the days of sliderules and a calcu lator was a toy to me The following day visited an electronics store and viewed the line of programmables The salesman saving the best for last brought out an HP
24. at line 23 returns the original x to the x register B1 eLBL DUT 12 CLA 82 SF 21 13 ARCL Y O3 FS 55 14 ALENG 84 GTO gi 15 XOY a5 k 16 p AREL x 17 24 a7 AYIEN i8 8S RTH 19 ABS A9 LBL Ai 20 XER SEPCHR 18 XER ACR 21 XE ACA 11 ALENG 22 KER PRBUF 23 ROY 24 END Continued KEY NOTES V8N2 Aug 83 Page 11 Travelling almost due east from Corvallis over halfway across the U S we come to Ann Arbor Michigan a beautiful college town I remember from the early 1950s when I at tended General Motors Institute in Flint Michigan It is also the home of M Douglas Reeves HP 41CV which uses the following routine 41 have been an HP user since the HP 35 first came out me too Ed_ and currently have an HP 41CV with which am very impressed However have had the same problem as mentioned by Dr Keith Bernstein in V4N3P12C with specifying a format field Below is a modified version of subroutine FA that uses fewer steps and reduces the problem when the number to be accumulated is longer than the field specified This routine requires that the number or alpha data to be accumulated must be in the Y register and the length of the field must be in the X register It also requires the HP 82180A Extended Functions Memory Module and a printer G1 LBL FA 2 CLA B3 ARCL Y 4 ALENG 85 BE X gt 8 87 SKPCHR 88 ACA 9 END Here is another input from Ann Arb
25. be sure to add 12 for the cassette and 3 50 postage and handling for the book The indi vidual programs also may be ordered indepen dently through the Users Library Some HP IL video interfaces do not have graphics capabilities U S dollars See note at bottom of cover Routines Techniques Tips Etc The routines techniques and tips furnished in this column are contributed by people from all walks of life and with various levels of mathematical and programming skills While the routines might not be the ultimate in programming they do represent new ideas and solutions that others have found for their applications You might have to modify them to fit your personal application Lets start the ball rolling with a fairly easy hut useful routine from the pen of Wyman W Trotti Jnr who lives in Cavee South Carolina and works in the real estate and insurance business 41 use my HP 41C primarily for financial analysis so it generally stays in FIX 2 mode However sometimes like to peek at some more decimal places So have assigned the enclosed program to the FIX key If the machine is in the FIX 2 mode the program executes FIX 6 if it is set for anything other than FIX 2 it executes FIX 2 picked FIX 6 because six are usually enough decimal places for my purposes B1eLBL FX 9 GTO 2 82 FS to LOeLBL 8i 63 GTO i ti FIX 84 FS 37 12 RTH 5 GTO Gl L34LBL G2 B FC 38 14 FIK 6 GTO 8l 15
26. bout any task reasonable for a handheld computer HP IL opens the door to the whole world of other com puters and peripherals The RS 232C Interface for example allows the HP 41 to transfer text and programs to other computers terminals printers etc The Video Interface allows you to display your data on as big a CRT TV screen as you wish This is great for group presenta tions or classroom work An example of interfacing the HP 41 to another computer is not only in documenting programs By transferring your HP 41 program to a larger computer that has a touch type keyboard and text editing features it is possible to annotate large HP 41 programs for documen tation purposes There are even suppliers that offer computer software that allows HP 41 pro grams to be written and debugged on another computer system This may not seem important to the average user but it illustrates the power and capability of the HP 41 as well as its accep tance in the marketplace With the HP IL inter faces available it is possible for the HP 41 to communicate with almost any smart electronic device You can even drive the largest HP bed plotter with the HP 41 It may not win any speed records but with the HP 41 HP IL HP IB inter face it is possible The HP 41 is well known by the user commu nity There is very little that is not known by skilled and long time users The writing of MCODE programs is a good example MCODE programming
27. chniques use row operations Gaussian elimination but the LU decomposition accomplishes an equivalent re Page 8 KEY NOTES V8N2 Aug 83 sult using the CROUT method with partial pivot ing and extended precision arithmetic This ac counts for the HP 75 s unusual ability to find an LU decomposition or an inverse for a singular matrix If that sounds contradictory get the ROM and see how it treats singular matrices as nearly singular Finding a matrix inverse or solving a system of equations couldn t be simpler The ROM key words that perform these functions are INV and SYS Both INV and SYS operate on square matrices only Although other versions of BASIC have similar functions the HP 75 Math ROM does these with care Again the LU decompos ition is the key The SYS keyword can also be used to find a matrix inverse This is more accu rate and faster than the INV function but the SYS keyword does consume more memory than INV As an example the 3x3 matrix 5 0 1 8 001 4 6 4 2 3 is nearly singular and the HP 75 Math ROM calculates its inverse as 0042612E 13 1000 2000 999999999997 5000 1000 666666666666 2000 3999 66666667 Multiplying A x A yields 1 0 0 3 99609061388E 12 1 00000002 1 99829552E 12 0 99999999 This performance is nothing short of excellent My favorite function in the ROM is the polyno mial root solver called P ROOT If you need to find the zeros of any polynomial with real coeffi
28. cognized that it will benefit the readers of KEY NOTES to have at least a partial listing of what is avail able today for their personal computation products Please remember These products are presented in KEY NOTES for your con venience and KEY NOTES reserves the right to exclude any product Also the listing of a product in this column does NOT constitute an endorsement by Hewlett Packard Company The listed specifications and prices have been taken from the pertinent manufacturer s literature If you have questions or need further information about anything in this column do NOT contact HP direct your in quiry to the manufacturer PORT amp MEMORY EXTENDERS These two devices are flat thin boxes that fit under the HP 41 and are held in place with fabric fasteners A short cable at the top end has a plug that connects directly into a port The Port X Tender provides seven more plug in positions six are switchable and with three left in the HP 41 gives a total of 10 plug in positions It will accept the HP IL Module A lithium battery maintains not only memory for modules plugged into the device but also time if the Time Module is installed No modifications are required to your HP 41 Carrying case to hold the HP 41 and Port X Tender is available U S list price is 149 95 The Memory X Tender is very similar to the Port X Tender except that one switch selects Bank A or B and each bank can hold one Exten
29. customers For example it s menu driven al lowing easy access to commands via a single keystroke Clear concise prompts make user input easy A HELP file is provided to let the user instantly review the commands when necessary And two setup files included with the product equip your modem with special code words for logging on to your account with THE SOURCE and the Dow Jones News Re trieval Service The Data Communications Pac provides HP 75 users with a versatile yet friendly terminal emulation capability It is available now at your local HP Dealer and the price is only 175 Dow Jones News Retrieval Service is a registered trademark of Dow Jones amp Company Inc SMTHE SOURCE is a service mark of Source Telecomputing Corp a subsidiary of Reader s Digest Association HP 75 MATH PAC The HP 75 Math Pac 00075 15015 is a powerful versatile software package that solves a wide range of mathematical prob lems from simple numeric and base conver sion to sophisticated polynomial rootfinding The range of mathematical capability pro vided is unprecedented in a portable comput ing product The Math Pac function set includes Real scalar functions e Base conversions Convenient input and output of arrays e Explicit and implicit array redimensioning e Extensive real and complex matrix opera tions Complete set of complex functions e Sophisticated polynomial rootfinder Solution to f x 0
30. d am working on the 40th have submitted 7 of them 6 are in review and 1 has been accepted and is in the new Catalog Addendum The programs cover a vari ety of subjects from calculus to video games And of course Nantucket and Solid Bar Graph Note This was one year ago Ed have been adding steadily to my system and am now saving for the HP 75C Imagine what new worlds that is going to illuminate for me Now all this sounds like must be some sort of brain No so For instance in calculus can t get to first base without my HP 41CV think that people tend to overrate me God bless them and are impressed with what do when they should be impressed with what the HP 41CV is doing My wife says that programming has brought me out of the doldrums that have been in for the last 8 years and that am my old self again She forgot to tell me whether that was good or bad As far as am concerned it is certainly for the good Thank heaven for HP I ve written enough I ve got to get back to my programming now Thanks again for your interest Robert L Keystroke Gardner Anamosa lowa There is much more to this story Mr Gard ner has even appeared during HP Days at local HP Dealer locations and has often as sisted our HP Field Sales personnel And al though I have not personally met Mr Gardner I think that my 9 years on KEY NOTES qualifies my assessment of him as an amaz ing per
31. d we sponsor regional conferences and local meetings in addition to producing our two regular Journals As you can imagine talk to a lot of HP users every day seven days a week have probably written edited and published more material on the HP 41 than any person outside of HP The comments that follow are mine but must also admit that have had thousands of other users educating me and their inputs are also included When the HP 41 was introduced it was de scribed by HP as A Whole New Standard How has the HP 41 been received What are users doing with their HP 41s How long will the HP 41 be around What new applications of the HP 41 can be expected will try to answer these questions with an overview of the HP 41 as it is used today in my first article in August 1979 made mention of the HP 41 as part of a system At that time we had no idea of what HP had in store for us with HP IL The HP 41 had four ports and several devices to plug into these ports Whenever you get a large number of compo nents in a system the system becomes more complicated The HP 41 is no exception Be cause the HP 41 was designed as a system component it was almost guaranteed a long life It is the system concept that makes the HP 41 the mind boggling product that it is When the HP 67 came along set my HP 65 aside to pick up the HP 67 used the two machines together for about six months before my HP 65 was finally l
32. ded Functions and two Extended Memory Modules The seventh slot is provided for the HP IL Module U S list price is 99 00 Add 5 handling and postage for each de vice For further information AME Design 2554 Lincoln Blvd Suite 5000 Marina Del Rey CA 90291 Telephone 213 306 1249 GORDON ELECTRONICS BATTERY PACKAGE This product consists of a charger for four N size nickel cadmium rechargeable bat teries The unit is simple to operate a fail safe red LED glows only when the batteries are charging Advantages of this system are stated as The batteries are charged outside the HP 41 so the computer never needs to be plugged in if a reserve set of batteries are used plus these batteries have more than twice the capacity of present half size cells Also one charger can serve more than one HP 41 U S list price is 35 for the charger and four batteries and 11 for an extra set of four batteries both prices postpaid Available in U S only For more information Gordon Electronics 27933 Briones Way Los Altos Hills CA 94022 EPROM Erasable Programmable Read Only Memory technology permits you to erase a chip s memory image and re use it with a new program image This erase and re program function can be repeated hundreds of times The process of putting a new image into an EPROM is often referred to as burn ing the chip This process requires not only sophisticated equipment but also s
33. designed for the single line dis play the HP 75 VisiCalc has added features and benefits that enhance its versatility Column row headers may be defined by the user with descriptive title A typical A6 cell for example may be January Taxes One worksheet may call data from another worksheet in memory and use this data in calculations Cell formulas in a worksheet may access BASIC programs Variable column widths allow greater flexi bility in designing worksheets The built in HP 75 editing feature allows the user to easily edit data entries and long formulas without unnecessary reentering The HP 75 is also expandable with HP IL peripherals add an HP IL compatible inter face monitor and printer and view VisiCalc on a full screen with hard copy output The value of the electronic worksheet has already been proven HP 75 VisiCalc maxi mized for the portable environment provides all the features of VisiCalc plus advanced features that enhance the power and versatil ity of both this product and the HP 75 itself HP 75 VisiCalc began shipping in July with a U S list price of 195 00 VisiCalc ia a trademark of Visicorp HP 75 TEXT FORMATTER PAC Now available Text Formatter 00075 15019 U S list price 95 00 complements the built in text editing capabilities of the HP 75 Text Formatter allows the production of short formatted memos and documents anytime anyplace a must for the business
34. e the book was originally published It is now universally available to HP 41 users all over the world This 91 page 8 5 by 1l inch 21 6 by 28 cm format book is unique in that it is a sort of glossary quick reference guide to the HP 41 system and some of the HP IL devices It in cludes over 900 of the most used functions in alphabetical order and each function is de scribed outlined and cross referenced to other functions it might affect or those that can be used with it Also included in the book is an execution timing chart for HP 41 func tions a subroutine decision table special synthetic instructions to use to assign any function to any key and to produce 128 tones from 0 05 to 5 seconds in 16 frequencies refer ence charts for the printer and timer module and lots more It is a very useful and very handy book especially if you have a com plete HP 41 system and have trouble remem bering all the functions that are available and what they are for The book is available from PPC see below and all proceeds from the sale of the book go toward helping to make PPC a better source of information to a wider range of users If you live in the U S Canada or Mexico the price is 11 70 postpaid Californians be sure to include your 6 or 6 sales tax Else where in the world the price is 13 45 and you must pay by check in U S dollars drawn on a U S bank Allow at least 3 weeks for delivery Order books
35. e what is available A lot of HP Dealers now stock these products in their stores or they can help you order what you desire Remember none of these products except where specifically stated is endorsed by Hew lett Packard For information prices and delivery consult the listed manufacturers Old Soldiers Never Die The following letter is true I ve had it for a long time always wondering if people would believe this story Maybe now they will But read the letter first the editorial remarks that follow will prove to you once and for all time that HP builds THE best calculators you can buy and that old soldiers never die they just retire Dear Sir Enclosed are the remains of Henry P I a cal culator which has been my constant compan ion for about 4 years When new Henry was a handsome fellow without peer among calcula tors He was greatly in demand and had to wait about 8 weeks for the pleasure of his company In a very short time Henry proved he was more than a looker In four years he demonstrated unmatched integrity and never reported in too ill to work He proved his mettle in the cities in the mountains and in dust bowls His performance in the U S Canada Virgin Islands and in Europe was exemplary On May 1 1975 while performing in his usual capable manner Henry P I died violently He accidentally fell into a bucket of 1200 F char in the city of Pretoria Republic of Sout
36. eferably by checks drawn on a U S bank TRAMP SHIPPING ARITHMETIC by John Weale is a 120 page softbound book available from the EduCALC Mail Store for 27 00 see postage and shipping details above under Data Processing book This is a series of well tried calculator pro grams written by a practicing ship operator concerned with everyday problems of commer cial ship operation While they are written for the HP 67 calculator these programs can eas ily be adapted to other models of equal capac ity such as the HP 41C The book is divided into sections relating to voyage estimating speed and fuel consump tion and financial calculations For more in formation about the book other books in the series or for availability in Europe etc write to Fair Play Publications 52 54 Southwark Street London SE1 1UJ England A CHRONOLOGY OF HP 41C PRO GRAMS FOR USE AND EXAMPLE by Thomas W Beers see KN V3N3p9 is a new 299 page manual in 8 5 by 11 inch format 21 6 x 28 cm and it is comb bound Forestry Professor Beers Purdue Univer sity Indiana now offers his personal notebook of 29 programs in manual form with complete documentation including directions exam ples program listings formulas and even references to U S Forest Service Technical Reports etc These programs include such useful topics as Timber Volume and Inven tory Sawmill Log Profit Margin Log Vol umes Tree Heights Statistics Probabilit
37. eft at home When set aside my HP 67 to pick up the HP 41 never touched my HP 67 again It was like going from a bubble gum machine into a giant candy store The HP 41 is the only machine of its type on the market When say of its type am referring to its being designed to be used handheld describe this kind of machine as a vertical format machine The HP 41 is a go anywhere do any thing machine won t repeat the long list of accessories that are available for the HP 41 but it is probably useful to describe what the HP 41 user has available today Let s divide this topic into Sup port Documentaiton Hardware Software and Accessories Continued KEY NOTES V8N2 Aug 83 Page 3 Support Documentation consists of the books and publications available to help the users im prove their understanding and application of the machine There are many books on program ming and applications There are books in French German and Spanish that am aware of and many of these books have been reported on the pages of HP KEY NOTES In addition to the programming books for beginners and the tips and techniques books there are even books on new languages for the HP 41 The most famous of course is one developed by PPC members It is called Synthetic Programming and it allows the user to program on the systems level The latest techniques involve what might be called machine language programming PPC members call this MCODE program
38. enough to send a guy into delirium tremors However had spent the money so thought had better make some use of it So started in word by word page by page Pressing every key the manual told me to press and working out every example until was sure that understood it One month later came to page 275 That was last February of 1982 From then on knew that was on to something You see l found that with a computer could solve a complex problem or a simple one for that matter once and then never had to solve that problem again Just key in different values vari ables How brilliant can a guy be This is all there was to that difficult thing Known as prog ramming was now a Computer Programmer was pretty proud of myself can tell you might add here that have since examined many computer manuals and now consider the one for the HP 41CV to be a masterpiece have failed to find one error in it technical or typo graphical At this point joined the Users Library or dered several programs and decided that wanted to write a program of my own So looked around and found the equation for com pound interest and then altered it to accommo date continuous compounding Well what do you know the darn thing matched the computer at the Savings and Loan Company to the penny By this time was truly in love and often worked straight through the night So far have written 39 programs an
39. ers Since there are many matrix operations in the ROM HP has provided functions that make matrix input output natural and convenient Matrices can be composed of either real or complex numbers and a clever use is made of a redimension statement REDIM that essen tially allows you to switch back and forth be tween a real and a complex matrix A real valued matrix can be considered as a matrix of complex numbers where each adjacent pair of real num bers represent the real and imaginary parts of a complex number Thus any matrix with an even number of columns or rows with the trans pose function can be considered as a complex matrix In BASIC a matrix is given a maximum size in a dimension DIM statement The REDIM statement allows the row and column sizes to be made larger or smaller as long as the total number of elements does not exceed the row x column product of the original dimension statement The Math ROM automatically provides com plex matrix multiplication complex conjugate transpose complex inverse complex determi nant and complex system of equations solu tions By combining the REDIM function and real number matrix operations you can perform any other compiex operation on a complex mat rix A powerful matrix function is the LU decom position lower upper triangular factorization The LUFACT function is fundamental in comput ing determinants finding inverses and solving systems of equations Other te
40. eyword is the Finite Fourier trans form The owner s manual discusses the re lationship between the finite and continuous Fourier transforms and also discusses using the FOUR keyword to compute the inverse Finite Fourier transform This will be very useful for those users who need to re scale data and op timize parameters that involve problems whose solution depends on Fourier series The FOUR function requires that the number of data points be an integral power of 2 Overall found the functions provided in the HP 75 Math ROM useful and powerful The owner s manual is very clear and well organized considering that this is an Advanced Math ROM found no problem at all in reading and under standing the purpose scope syntax etc with any of the functions The manual contains ap pendices that cover memory requirements error conditions messages and a keyword index If your application requires sophisticated numeri cal processing you ll find the HP 75 Math ROM is a well designed and very worthwhile easy to use product John Kennedy has an MA degree in mathematics from UCLA He teaches Mathe matics at Santa Monica College and is involved in running the College Math Lab He has had an interest in computing for six years and started with an HP 25 John has written sev eral articles on number theory and numerical methods as applied to programmable cal culators and was Math Coordinator for the PPC ROM Ed Can Handheld
41. h Africa Upon returning to the states considered courses of action One neither mourns an old friend forever nor tosses him in the trash can send Henry to you in hopes that Hewlett Packard has a hall of fame for old calculators which have given distinguished service above and beyond that expected and which have died with their boots on If such an honor is not available to Henry please give him a decent burial After all he is family Very Truly Yours William Solano Monroeville Pennsylvania When I received Henry PI in the mail he was sent to me for a decent burial But the more I looked at that poor incinerated blob of plastic the more curious I became I tele phoned Mr Solano and verified that it was true that the HP 35 not only had fallen into a charcoal brazier but also had stayed there over night until the fire cooled The keys seemed to operate so I dug away the mess where the recharger pins protrude at the back of the case and I took it to the R amp D Lab to put some cur rent on it I know you won t believe this but it s true The HP 35 still worked At least most of it did Henry was NOT dead only sort of retiring from a heat stroke I ll bet you think I invented all of this just for this last issue of KEY NOTES Well you re wrong The letter is genuine the HP 35 did work and I took the photos myself I needed one more ar ticle to fill up this issue
42. hat interesting KEY NOTES By the way there s a little mistake in that routine TFUNK V6N4P5 for the Time Module line 2 should be 1 1 and notjust 1 as this loops 101 times Try it also enclose another routine for the Time Module It runs the stopwatch the same way as the clock The routine is very easy to under stand and it is very useful for many purposes 1eLBL CAL 16 RON 82 1 E 5 17 HMS 83 STO B 18 RDH 4 RUNSK 19 HMS ASeLBL 88 20 Rt 06 ST BA 21 67 RCL 68 22 2 8 TIME 23 9 HMS 24 FIX 8 1 SETSH 25 VIEN 11 LBL 8i 26 X40 12 TIME 27 GTO 46 13 RCLSH 23 SH 14 RCLSW 29 END 15 TIME Meanwhile in Grosse Pointe Woods Michi gan James W Montgomery is developing routines for his HP 41 Here s one he wants to share with KEY NOTES It requires the Extended Functions Memory Module and is useful only for the HP 82143A printer 41 The enclosed subroutine is a device independent output formatting routine If you program it as shown without a printer at tached the instructions will resolve them selves at execution time later Thus the ALPHA register is left justified and the X register is right justified in the buffer and the contents are printed to the attached printer Otherwise sensing the absence of any printer device the subroutine will concatenate the stated register contents around an equals sign and stop dis playing them in the HP 41 window Notice th
43. hough you might never fully utilize the enormous potential in your HP 41 or HP 75 isn t it nice to know that such projects as the one Dave Stedman has shared with us are entirely possible with that powerful little tool you carry around with you I m sure you know the answer to that question as well as the question atop this article KEY NOTES V8N2 Aug 83 Page 9 Get Rid of Your Time Out The Easy Way We have received several questions on how to wake up HP IL devices that have been pow ered down with the HP IL Loop Power Down LPD command without having to wait 10 seconds for the HP 75C time out period One way to do this is shown below By put ting the HP 75C to sleep and waking it up with a timer the HP 75C sets an internal flag that tells it to check the HP IL loop before using it An ASSIGNIO or RESTOREIO com mand will clear this flag and set the time out back to 10 seconds but other HP IL com mands such as the CLEAR LOOP used in this program do not reset the flag until a frame has been sent out successfully The program assumes that the user has already done an ASSIGNIO The DISPLAY IS and PRINTER IS commands are needed to keep the SENDIO from getting a time out error Program to power loop down and up 10 DISPLAY IS PRINTER IS 20 SENDIO unl tl lpd Loop is now powered down Initialize timer file and set a time to wake us up in 01 seconds 30 ON TIMER 999 1000000000 RETURN 40 ON
44. ic functions and their inverses Continued KEY NOTES V8N2 Aug 83 Page 7 3 Logarithms to any base 4 Binary Octal Hex number base conver sions 5 Gamma function factorial 6 Matrix products and determinants 7 Matrix maximum minimum and row column norms 8 Vector dot products 9 Complex arithmetic operations 10 Complex transcedental functions and their inverses 11 Matrix input output including redimension ing 12 Complex matrix operations 13 Matrix LU decomposition 14 Matrix inverse and system of equations sol ution 15 Zeros of polynomials with real coefficients 16 Zeros of any real valued function 17 Definite integrals of a real valued function 18 Finite Fourier transform To keep this review to a reasonable length we will limit the discussion to the last eight items listed These are the more powerful functions that when combined with the many other utility functions make for a very capable problem sol ving tool kit as described in the owner s man ual Owners of previous models of HP program mable calculators will find many functions from the HP 34C HP 15C and HP 16C calculators present in the HP 75 Math ROM and much more The emphasis is on matrix operations but the speed and accuracy of the HP 75 will make it painful for calculator users to go back to their old machines In fact the HP 75 Math ROM compares favorably with the Math Pacs avail able for the HP 85 or HP 86 87 comput
45. illwater Drive Garland TX 75042 Telephone 214 238 1776 Horizons Technology Inc 7830 Clairemont Mesa Blvd San Diego CA 92111 Telephone 619 292 8331 Profit Management Systems 3637 4th Street N Suite 350 St Petersburg FL 33704 Telephone 813 822 1793 CUSTOM CASES FOR HP 41 These products range from a saddle leather case for just the HP 41 to a briefcase that holds the whole system Too diverse to describe in detail we ll list what s available and you can check for yourself Custom Leather Case Hand crafted rus set cowhide heavy stitching positive tuck catch Also fits Series E J A Gendron and Company N 1012 Washington Street Spokane WA 99201 Telephone 509 326 4490 Continued PORTABLE EPROM UNIT FROM HANDHELD PRODUCTS INC This new portable EPROM unit the first of its kind features the capability of 32K PROM memory for custom application pro grams and fixed data storage and is the size of the HP 41 card reader It attaches to the HP 41 in the same manner as the card reader prices availability and further information write or call Hand Held Products Inc 6401 Carmel Road Suite 110 Charlotte NC 28211 Telephone 704 541 1380 Page 14 KEY NOTES V8N2 Aug 83 HP 41 Language Contest In V6N3 we initiated a contest to name the language used by the HP 41 And by the way the contest was long ago closed so please do not submit more entries Since the e
46. is done by only a very few people but their output is increasing every day Imagine sorting 20 registers in less that one second or storing ten alpha characters in one register The HP 41 may be as simple or as complex as you wish to make it You can get into program ming the machine at three levels including stan dard user language The HP IL provides so much power that it will take another year for the user community to write all the obvious pro grams The HP 41 is competitive in the mar ketplace and is rapidly becoming the students computer Visit any college campus and you will be amazed at the number of HP 41s there are and most of them will have at least a Math Pac in them Will the HP 41 have a long life believe that answer is obvious The HP 41 will be with us for several more years HP IL insures a long life especially for any peripherals that you buy for the loop If a small portable machine is needed the HP 41 will fit the bill There is nothing on the market that can match it To me the HP 41 is today just as exciting as it was over four years ago My only problem is getting enough time to write programs for all the ideas have The HP 41 has no peer yet isn t it marvelous when a college student can have the very best 1 PPC is a registered trademark of the Personal Program ming Center Incorporated 2 The next PPC Regional Conference is August 27 and 28 at the Airport Sheraton Hotel in Orla
47. lection evaluation care and application of personal products for computing The basis of PPC is the operating philosophy that only a priceless idea is proper exchange for another priceless idea Programming techniques al gorithms for solutions to problems programs hardware innovations and machine charac teristics are representative of the many topics of interest to the users of personal calculators and computers Any activity that helps users and members to better understand their personal product for computing is suitable for PPC Local chap ter or community meetings for classes or con ferences for formal presentations at an ad vanced level are common PPC activities There is even a clubhouse at the head quarters for the Personal Programming Center in Santa Ana The Center is used as a publication production work area in which to produce the two Journals and other publica tions and it also serves as a member meeting place and as a museum for the artifacts of the modern personal calculator computer age An extensive library office conference room and publications storage area complete the Center Probably the most active day evening night is when members show up to join in for the regular stuffing party a sort of social event during which their Journal is inserted in envelopes and prepared for mail ing PPC has even contracted with HP for a custom HP 41 ROM known as the PPC ROM The
48. lems also should be addressed to the publisher not to KEY NOTES AN EASY COURSE IN PROGRAMMING THE HP 41 is a new 256 page spiral bound book published in July 1983 and the size is 8 5 x 11 inches 21 6 by 28 cm It was written by Ted Wadman and Chris Coffin both former employees of Hewlett Packard s Cor vallis Division Both are recent graduates of Oregon State University Ted as you will re member was the Technical Editor of KEY NOTES for a while he s now in Cameroon in the Peace Corps Chris formerly worked in the Customer Support department answering a lot of your questions about our products So they both have considerable hands on ex perience with the HP 41 When you attempt to document anything about the HP 41 you soon realize that the myriad symbols involved in the code present a real challenge to normal typesetting One of the big surprises you ll find in this book is that in order to circumvent the typesetting problem they simply hand printed the entire book It is truly a work of art with illustra tions by Robert Bloch and with many easy examples to follow Although the subject matter is serious enough the authors have taken a new light easy going approach in their presentation of this self paced course in learning what pro gramming is all about on the HP 41 If you are a beginner this is the book for you and if you can t learn to program your machine from this book you ll wonder ho
49. ming This is the very same type of programming that the original designers of the HP 41 used when they created the HP 41 There are no learning books on this topic as yet but hope that there will be by years end One 17 year old young woman from the PPC Orange County Chapter has even written LISP for the HP 41 FORTH is another computer type language that could be added in the future PPC has even written a 500 page book that covers programming tech niques on the HP 41 It is called the PPC ROM User s Manual In addition to the dozen or so books that support the HP 41 there are many technical articles on almost any subject that includes programs as part of the article Hardware that is used with the HP 41 includes such items as EPROM Boxes MLDL type RAM boxes Port Extenders and battery chargers to name the more important items When a number of independent manufacturers start their com panies making support hardware for a product like the HP 41 you know that they think highly of the product The EPROM box is a plug in Read Only Memory ROM that runs up to 32K of your own programs The EPROMs may be erased and reprogrammed with special equip ment The EPROM box is as expensive as the HP 41 but well worth the money if you run large data bases or long programs on your HP 41 It takes it power from the HP 41 and does not contain batteries Programs in an EPROM box run just as if they were program application modules The ML
50. n t you every publish a photo of yourself so we can know you bet ter So since this is my last KEY NOTES I thought I d grant you that small favor now aren t you sorry you asked And if you re still wandering yes the col umn title is correct am retiring very soon from Hewlett Packard and this is the last is sue of KEY NOTES that I will write I cannot predict that it will be the very last issue of KEY NOTES but that is a possibility People like me seem to be a scarce item and the Company has not found a replacement for me So I cannot foresee the future of KEY NOTES I can tell you only that HP knows the value of staying in touch with you I am sure an alternative to this newsletter will be found Second question Why are you retiring For three reasons 1 I always wanted to retire young I m 55 2 I want to pursue some personal writing projects travel a bit etc and 3 I finally can afford to do it Maybe the first two reasons aren t important but the last one sure is Probably I will take a long rest first and move back to my first love San Diego After that who knows It is a very small world and it is brimming with oppor tunities challenges and adventures Henry Horn alias Ed and Friends When you ve done what I ve done all these years and this time for departure looms sud denly before you you realize that there is still a lot you ve never done hundreds of ro
51. nd have a bad heart Other than that am in tip top shape So much for the sob story My life s vocation was that of a printer in my prime years worked for the Chicago Daily News and later for Rand McNally am a World War il veteran and all that sort of thing More sob story coming so get out your handkerchief In 1973 was forced into early retirement because of failing eyesight and returned to my home town of Anamosa lowa For the first 8 years was lost and am afraid that became quite a dull old fellow and then Well first let me go back a bit and say that due to my own indolence do not have much formal education having been an eleventh grade dropout in 1933 Since then have endea vored to somewhat improve my education at home and when the electronic calculators came out a few years ago was soon trying them all out But that wasn t enough There was so much talk about computers that decided that didn t want to live through the computer age and never understand what they were all about So made the first move and John Jorgensen and Brad Jenkins of the lowa Book Store in lowa City did me the great favor of introducing me to the HP 41CV And so now repeat and then Love at first sight You can just bet your bot tom dollar that it wasn t wondered what had let myself in for could see that it was a powerful tool but didn t know what was going to do with it The manual was
52. nd of the contest we ve tried to legally clear several names you seemed to favor but they already were registered trademarks Also it is very difficult to do this on a worldwide basis However be patient We are confident we have a winner in process and we will notify that person soon We haven t forgotten you Professional Briefcase A vacuum molded premium quality case with gravity key locks will not open when upside down and magnetic divider holders Holds an as tonishing assortment supplies Hand Held Products see address above of hardware and 41 System Case Weighs only 2 9 pounds and features sturdy aluminum shell and key locking hasps plus personalized plate for en graving In two sizes Holds a whole system Marketing Systems International 18516 Mayall Street Suite G Box NP Northridge CA 91324 Telephone 213 885 5966 HP 41 System Carrying Case Called the RPN 41 Work Station this is a system pack age designed to consolidate integrate and secure the HP 41 card reader and printer and it will also carry software and supplies Soft carrying case shoulder strap anodized aluminum extrusions very compact profes sional design Capital Calculator Company Inc 701 East Gude Drive Rockville MD 20850 Telephone 301 340 7200 These are not all the many products that are available to you today Your local HP Dealer is kept up to date on such products so you should stop in to se
53. ndo Florida USA Any HP user is welcome Can an HP 41 Change Your Life It was exactly one year ago today that I first met in a letter the extraordinary man I now bring to your attention You ve heard of him before notably as the computer Picasso who painted the Nantucket printer picture that was published on page 9 in V6N3 also one year ago Since then it has been my fond est desire to print this article for you and now since this is my last KEY NOTES see Edito rial it makes me happy that I have this oppor tunity to give this gentleman the recognition I think he deserves I asked him to supply some information and he did I rewrote it twice but soon gave up and decided to print his letter Just as he sent it to me It is priceless so is he Here then is his letter you ll love it Ed Dear Henry Thank you for your interest in my love affair with the HP 41CV Since your telephone call have been pondering how best to supply the information you want have decided to give you my general statistics and then ramble on about what do what I think and why This way you should know me pretty well by the end of this letter and then you can take it from there Before begin let me say that you are free to quote me or to make any reference you wish as to my age health education etc You have a free hand am 66 years of age now 67 Ed wear a hearing aid am legally blind a
54. nguage low level commands No additional hardware ROMs or binary pro grams are required ADDITIONAL CAPABILITIES This graphics software organized similarly to graphics presentations software for desktop computers provides a friendly method for generating good quality multicolor plots It is also compatible with mass storage and exter nal display via the HP 82161A Digital Cas sette Drive and any HP IL video interface GRAPHICS CAPABILITIES The line chart plotting program allows the generation of one plotter page multiple line graphs Seven line types and two pen colors can be used allowing a large variety of high contrast plots The bar chart plotting program provides for multiple bars a variety of hatch types and two pen colors The pie chart plot ting program produces a single pie whose sec tions may be pulled and hatched MEMORY CAPACITY Each program utility consists of two pro grams averaging 9Kb per pair that with the generated file can be used within the 16K RAM capacity of the HP 75C ORDERING INFORMATION The HP 75C Graphics Users Library Solu tions book P N 00075 13016 comes with com plete documentation commented program listings and magnetic cards and it is avail able now at your local HP Dealer Price is 45 This solutions book also may be ordered on cassette for use with the HP 82161A Digi tal Cassette Drive but must then be ordered from the Users Library in Corvallis
55. nknown the program will ask addi tional questions until enough data has been gathered to compute the answer The HP 75 Surveying Pac was released in July with a US list price of 295 00 NEW HP 75 DATA COMMUNICATIONS PAC Released August 1 the HP 75 Data Com munications Pac 00075 15035 enables you to transfer data and information to other com puters With a modem and the Data Com munications Pac an HP 75 can access other computers and commercial time sharing sys tems such as THE SOURCE and Dow Jones News Retrieval Service to obtain armchair access to stock quotes send or receive mail and access complete libraries of information anytime anywhere This HP 75 pac provides some versatile fea tures not commonly found in data communica tions software for portable computers The Data Communications Pac allows the HP 75 to be configured with either the HP 82168A Acoustic Coupler or any RS 232C compatible modem with the HP 82164A HP IL RS 232C Interface Incoming or outgoing information can be displayed in three different ways scroll information across the liquid crystal display view a full page of text using a video interface and monitor or receive hard copy output with a printer A 500 character buffer is provided to review received information Also using this package text files may be transferred to and from a host computer The Data Communications Pac provides many user friendly features for nontechnical
56. nsure about charges from publishers or third party manufacturers listed in KEY NOTES call them or write to them and determine the correct charges To do otherwise wil only cause serious delays in your order delivery Neither Snow Nor Hain Nor From that heading you might deduce that this is about Oregon in a way perhaps it is The heading refers to the inscription above the entrance to the main post office in New York City It is Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds It was paraphrased from a similar statement made by Herodotus a 5th Century B C Greek historian who was actually de scribing the mounted Persian postal system But why are we even mentioning this Well we thought it might be of interest to you that you aren t the only ones who buy and like and use HP 41s At the begining of 1983 we shipped over 4 000 HP 41CVs and over 3 200 card readers and over 3 500 thermal printers to the U S Postal Service They not only found that their application was successful but also that they wanted even more of them This month we received an order for another 3 000 HP 41CVs card readers and thermal print ers and also some battery packs The U S Postal Service uses the HP 41 sys tem to measure mail in feet believe it or not and then they use the gathered data to redistribute the work load more evenly per mail carrier in o
57. obtained by dividing the earth s radius by the satellite s orbit radius BLSLBL DOM SAT 24 STO 63 2eLBL A 20 RCL 43 3 SITE LAT 26 COS 04 PROMPT 2 REL 86 3 HR 23 COS 6 STO BB 29 4 87 SITE LONG 38 1387773 88 PROMPT al 89 HR 32 RCL B2 10 STO 8i 33 SIN LI LBL B 34 RCL 83 12 SAT LONG 35 SIK 13 PROMPT 36 7 14 PCL Bi I 15 33 ATAN 16 ST0 82 39 CHS i TAN 48 AZ 18 RCL 88 41 ARCL 93 19 SIN 42 F EL 2h 7 43 AREL amp 2i ATAN 44 AVIEH 22 188 45 ADY 23 46 END In V6N4pl 4c we printed a SORT routine that had a bug or two in it OF the many personal versions sent to us this routine by Gerhard Kruse of Drosselpfad West Ger many seemed to most aptly correct the origi nal routine 41 Using the same method as Hans Aspen berg in V6N4 here is my sorting program It does not use any data registers just the stack Key in the block of data registers to be sorted using the format bbb eee as for PRREGX where bbb is the begin address and eee is the end address of the block Then XEQ SORT The data registers will be sorted in ascending order If you change line 11 to X gt Y you ll get a sort in descending order The program uses only 48 bytes 14LBL SORT 15 KO Y 82 SIGH 16 LBL 82 O3eLBL 06 17 RDN 04 LASTX 18 ISG Z 5 ENTER 19 GTO 6i 66 ENTERT 20 RCL IND L O74LBL 8 21 X lt IND Z 8 ELY 22 STO IND L B9 RCL IND Z 23 186 L 18 RCL IND Y 24 GTO 88 ti XY 25 CLST
58. onal RAM MCO00590A retail price is 95 They were available as of July 1 1983 see address below Mountain Computer Inc 300 El Pueblo Road Scotts Valley CA 95066 Telephone 408 438 6650 KEY NOTES V8N2 Aug 83 Page 13 The third product from this company is an MC00701A HP IL 80 Column Video Inter face This video interface provides 24 rows by 80 columns or 20 rows by 40 columns and is fully compatible with the HP 82163A Video Interface It can be used with HP IL and the HP 41C CV HP 75C and Series 80 com puters This product will connect to any stan dard video monitor or it can be used with conventional TV sets if an RF modulator is added Retail price is 325 and although Mountain Computer makes this product it is now available only from Hewlett Packard and only in the U S at this time See your local HP Dealer for details or orders The HP part number is HP 92198A CUSTOM KEYBOARD OVERLAYS Custom overlays are produced by a number of manufacturers Some do the entire job some require your artwork They are produced in up to seven colors and up to four can be used on the keyboard at one time and since some are reversible this allows using eight surfaces at one time for user instructions There are usually quantity restrictions probably starting at minimum orders of 100 So if you are in the market for such products here are three manufacturers to query Dallas Development Systems 7410 St
59. ophisti cated knowledge of what takes place MOUNTAIN COMPUTER INC PRODUCTS Mountain Computer of Scotts Valley California a firm that developed peripheral products for micro computers is now offering a series of peripherals for HP products One product is a powerful EPROM Pro grammer MC000506A that is a low cost de velopment tool for use with computers having the HP IL interface This device includes software programs for HP Series 40 Series 70 and Series 80 computers These programs will read a byte of data write a byte of data verify that the EPROM has been erased create a data file from an EPROM and write a data file to an EPROM Virtually all current 24 and 28 pin EPROMs may be read pro grammed and duplicated Retail price is 450 and it is available now see address below Another Mountain Computer product is the EPROM and RAM add on unit for the HP 41C The MC00550A Applications Memory Sys tem AMS is a low cost peripheral that adds program and data space for the HP 41C CV handheld computers Three EPROM sockets are provided to hold up to 16K bytes of infor mation The optional RAM unit MC00590A plugs into the AMS and adds up to 16K bytes of RAM with battery backup The EPROM supplied with the unit provides a powerful software package including a user code pro gram to ROM translator EPROM burn soft ware using the MCI MC00506A and more The AMS MC00550A retails for 195 and the opti
60. or Michigan I wonder if these two HP 41s know each other Anyway this tip is from Jack Warner who writes about a recent arti cle in V7N1 41 The concern of Mr Peraino V7N1p7a running out of battery power in the middle of a long program does not seem to be a problem in actual practice have an HP 41C program that runs for about 30 hours and my computer has run out of power on several occasions dur ing the run Each time turned the HP 41C back on saw the low battery message in the display viewed the ALPHA register to see if the program came to a normal stop then turned the machine off plugged in the AC adapter turned the machine on again pressed R S to resume the run where it had stopped and the results of the program were unaffected It appears that in situations where there is insufficient power to keep a program running there is still enough power to maintain Continuous Memory plus a little extra so that you can turn the HP 41 on and check the program status P S The HP 41C is a great machine And the Users Library a great service I ll challenge a Censored computer any day to crunch num bers like my HP 41 Thanks for the input Mr Warner and for the compliments For those who don t know about it V7N1 was an 8 page issue that was printed inside the cover of the last Library Catalog If you want a photocopy it costs 2 50 postpaid in the U S Canada and Mexico it is 3 00 elsewhere
61. outine by Ed Keefe in the latest issue of KEY NOTES returns incorrect values if the string it is converting contains the characters 7 8 or 9 This is because of the MOD 55 done on each character This MOD correctly returns the number corresponding to the charac ters A through Z but produces the incorrect values 0 1 and 2 for 7 8 and 9 Enclosed is a listing of my modifications to the program to correct this oversight The code is a little convoluted to keep it short but essentially it makes sure it has something gt A before doing the MOD PS Thanks for the great newsletter GI LBL xD 15 RDN G2 CLR 16 48 A34LBL Bi 17 MOD a4 ATOX 184LBL 87 85 X 87 19 A6 GTO 62 28 RCL 6 07 64 2i 88 X gt 22 GTO Bi 89 GTO B 23 LBL 82 1A RDN 24 RDN 11 55 25 RCL 86 12 MOD 26 13 GTO 87 27 STOP 14 LBL 86 Thank you Peter lve enjoyed every minute of it Now I leave you to figure out who is right or are they both right What a way to go But at least you ll remember me for this one eh Ed Whoops X Ed Third Party Hardware Over the years many entrepreneurs manu facturers private parties and even calculator computer owners have asked us to advertise their products in KEY NOTES For legal and other reasons we chose not to do so in this newsletter However with the advent of HP IL for the HP 41 plus the awesome capa bilities of the HP 75 we ve re
62. plications Accordingly work on a kerosene burner was dropped and attention directed solely toward use of diesel oil as fuel At that time it was determined that there was a significant market for a relatively low heat output forced air furnace supported by the needs existent in both the marine indus trial and recreational areas For these applica tions safety and fuel storage volume were judged to be dominant design requirements and were imposed upon the furnace design in addition to assuring simplicity of operation durability minima electric power demand and low fuel consumption As the development progressed other fruit ful markets were perceived however the de sign requirements noted above were actively maintained throughout the development and dictated the component choices now repre sented in the demonstration unit In addition the gains in safety realized by the use of diesel fuel are amplified in many of the applications where storage of this fuel already exists This eliminates the complexity of separate fuel storage and the need for additional safety procedures incurred by the use of a second fuel type The use of the microprocessor temperature and burner control eliminates the need of spe cial knowledge or training by the user The thermostat is set to the desired temperature and the microprocessor controls to that tem perature and monitors the burner to assure that any deviation or malfunction is re sponded
63. rder to gain efficiency in that operation They also use the HP 41 system to gather data about how much time the mail carriers spend on sorting their mail load If too much time is spent on that the data will soon prove the need to hire a clerk and free up carriers for the actual distribution channel That this application is a huge success is very evident by the receipt of a second large order for HP 41 systems And although the U S Postal Service is a very large organiza tion and needs such tools to make repetitious jobs more efficient even a smaller sales ser vice or manufacturing operation can benefit from the use of HP 41 systems that can pre vent mistakes and gather highly useful data And if you have a repetitious operation that requires each person to do something exactly like all others doing it then maybe you need not only multiple systems but also custom ROMs Give it some thought you can call your local HP Sales Office for more informa tion on custom products or you can call Sten Andersson here at Corvallis 503 757 2000 extension 3016 not a toll free call HP 41 systems have proven invaluable in parking lot applications in gasoline service stations in market forecasting applications in hydraulic engineering applications heat ing and ventilation and many more Think about your needs maybe you are missing a chance to save large sums of money by becom ing more efficient Where Do I Go From
64. s Aid High Technology A lot of you who own high technology cal culators and handheld computers and read this newsletter must often wonder if these instruments really are put to the test in the world of high technology By and large a lot of you use your personal computation tool to make your job easier or more productive or you use it for your own business or just for pleasure But to get back to the leading sen tence yes our esoteric products are often used in developing new advanced technology and here is the story of one such incident and the person behind the machine It was approximately one year ago that I went down to the lobby at the Corvallis site to meet an engineer inventor from Washing ton He was visiting here to discuss some equipment configurations with one of our HP IL engineers and wanted to be certain of vari ous interface possibilities before attempting them The visitor was Dave Stedman and his invention was a super efficient furnace He was using the HP 41 and the HP 75C to monitor data from the prototype device and even to control some functions I have stayed in touch with him and with progress on this radical new furnace so we could report to you in KEY NOTES how it is possible to stretch the boundaries of technology using the tools that many of you already own The device presently in the patent pending stage is a quiet high efficiency furnace type of heater that burns diesel
65. son But if I ever get even remotely near Anamosa you can be sure that I will stop to meet him Since I last talked with Key stroke he has acquired an HP 75C and he is already doing amazing things with it Right after getting the HP 75C he sent to me a cas sette tape that contained The Flight of the Bumble Bee Clarinet Polka Hello Dolly and Somewhere My Love and that is old hat for him by now Also now that he has a new printer for the HP 75C we may soon see the Mona Lisa via his programming I wouldn t be surprised He has by the time you read this undergone an open heart surgery and I can only hope that it will make him healthier so he can go on pursuing his new love Just learn a lesson from all of this just over 2 years ago Mr Gardner was a rank amateur in programming He can barely see even with the aid of powerful lenses yet he mastered the art of programming You can too just do what Keystroke Gardner did and you ll soon be an amazing person your self Ed Book Reviews Books are reviewed or announced in KEY NOTES only as a service to our readers A review here does not represent an endorse ment by Hewlett Packard Company If you are unsure about the contents or usefulness of a book we suggest you first check with a local bookstore or your HP Dealer many of them stock these books If that fails write to the publisher not to KEY NOTES Availabil ity prob
66. t company in Tampa Florida as a Senior Systems Analyst working on insur Page 6 KEY NOTES V8N2 Aug 83 ance cash and billing applications He has a BS degree in mathematics and physics from John Brown University Arkansas 1979 and is married and has two daughters In 1979 he was selected as Outstanding Young Man of America by the U S Jaycees He is a U S Army veteran Viet Nam and a member of PPC having founded the Suncoast Chapter in 1982 No stranger to handhelds he s owned the HP 35 HP 25 HP 25C HP 67 and HP 41C This book really grew from the sales inven tory and receipt programs Mr Phillips wrote for his wife s dough art business After suc cessfully implementing those applications he realized that the HP 41C had much more capability than most people knew And be cause of this he decided to write a series of books the first of which is reviewed here From this first effort it is easy to see that he knows his art well and knows how to write about it To obtain the book by mail order write to EduCALC Mail Store 27953 Cabot Road Laguna Niguel CA 92677 or telephone 714 831 2637 The price is 16 95 plus 1 for surface shipping in the U S For UPS add 3 per order and 2 50 per item for U S air mail For Canada and Mexico the book is 20 45 by air mail For all other coun tries it is 22 95 by air mail Allow at least 3 weeks for overseas areas and all payments must be in U S dollars pr
67. ustic Coupler Modem Now HP IL based systems using the HP 41 or HP 75 can transfer information to and from other computers at remote locations The 300 baud battery powered portable acoustic coupler meets the Bell 113 standard and is suited for conventional G type tele phone receivers The fully automatic HP IL command controlled operation of the coupler includes an automatic power down feature that assures minimal power drain Control protocols include ENQ ACK and XON XOFF while data error detection is accomplished by parity bit selection as odd even zero or one For remote data communication applica tions where portability and compact size are needed an HP IL system using the HP 82168A Acoustic Coupler provides a light weight alternative that easily fits in a brief case The U S list price of this modem is 495 and it is available now see your local HP Dealer Extended 1 0 Module required U S dollars See note at bottom of cover Graphics For The HP 75C The new HP 75 Graphics Users Library Solutions book is a friendly software solution to generating graphical plots using the HP 75C and the HP7470A Plotter This Users Library Solutions book contains three sepa rate BASIC language utilities by which the HP 75C can generate line bar and pie charts These programs take advantage of the HP 75C s native ability to be an HP IL loop con troller to drive the plotter via HP GL HP Graphics La
68. utines you ve never printed thousands upon thousands of readers you ve never met and never will So many unfinished ideas articles plans But nothing lasts forever tomorrow after all is the beginning of the next day of my life and yesterday is but a memory You have given me many good memories for the years ahead and I am grateful for the wonder ful experience of being able to be a part of 5 A Alaska your life however small it was You might not believe it and I m sure my co workers don t but I ve enjoyed every minute of KEY NOTES except these last 20 minutes Keep on pressing those keys and thinking of good routines and programs And if you can t program your HP 67 97 41 or whatever stick with it I guarantee you it is a lot easier than writing this last editorial May all your problems be keystroke solva ble and may you never run out of memories I shall not Finis coronat opus Ed Alias Henry C Horn and Hawaii Library Corner NOTE All information in this column per tains to the HP Users Library in Corvallis Oregon All orders questions or program sub mittals should be addressed to The HP Users Library Dept 39UL 1000 NE Circle Boulevard Corvallis OR 97330 U S A GOOD NEWS After an almost unbelievable avalanche of program submittals brought on by the Li brary Contest life in the Library is returning to normal By the time you read this the Library will
69. w you ever learned to read Even if you can somewhat program an HP 41 you will find this book an excellent brush up course The book is actually a programmed course in learning what the HP 41 is all about how to use its controls and functions and how to write programs for it You are led step by step from the beginning to the end If you know a subject you are directed to go ahead If you fail to answer some questions you are sent back for a review of the subject As you progress you learn more and more until sud denly eureka you have written your very own program Examples abound and you are even led through them It is a cinch that if you read the book if you follow the directions if you work the examples and if you are familiar with the HP 41 you will learn to program it And as a real bonus I guarantee that you ll have fun doing it An amazing book read the Edito rial on page 250 first and I think you will agree Check with your local HP Dealer at your local college bookstore or at the EduCALC Bookstore 27953 Cabot Road Laguna Niguel California 92677 for copies or write to KEY NOTES V8N2 Aug 83 Page 5 Grapevine Publications Inc P O Box 25724 Portland Oregon 97225 The list price is 15 plus 2 postage and handling in the U S In Canada the book is 15 plus 3 50 for air mail For all other coun tries the price is 15 plus 6 postage air mail and handling All payments
70. y Log Scaling and much more a total of 5 527 program lines With these programs you can save time like sorting by grade within species you can avoid looking through tedi ous tables and you can minimize errors How ever you will need either an HP 41CV or an HP 41C with a Quad Memory Module and a printer is optional If you are a beginner with the HP 41 these programs written over a 3 year period can guide you through the learning process in a profitable manner because they reflect the growing knowledge of the author as his exper tise developed More experienced users should be able to find immediate applications for many of the programs Although slanted to ward the forestry field numerous statistical and other general programs are included The book can be ordered from EduCALC at the address listed above for the Data Proces sing book The list price is 31 95 and postage and handling is the same as that listed above for the Data Processing book You also can purchase a magnetic tape mini cassette for the HP 82161A for 125 and it contains all the programs Postage for the tape is the same as for a book HP 41 HP IL SYSTEM DICTIONARY This book written in 1982 by Cary Enoch Reinstein was recently donated to PPC See Where Do I Go From Here elsewhere in this issue the independent users club headquartered in Santa Ana California This second printing includes all corrections made sinc

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