ECONORAM IXToM USER`S MANUAL
Contents
1. ee eee 5 8 anette as BE oan 6 Memory address 7 Block disable SWIitCNGS s lt c n5 036 eas bea ee ieee ee 7 Write enable awh es 7 Memory ee lees 7 LOGIC OlAOl aI 8 9 Memory testing 10 Oeut 22254555255 11 Customer service 12 522 222 55 Seed en kod 12 2 COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS 2355 OAKLAND AIRPORT 94614 ABOUT ECONORAM IX Congratulations on your choice of the ECONORAM IX a 32K x 8 memory board designed specifically for electrical and mechanical compatibility with the Digital Group buss sockets bypass capacitors and other components are soldered on the board in order to eliminate the most tedious and error prone aspects of the assembly of this type of kit Assembly should take only an hour or so2. 1 0 18H CoA DONE NXAD FAIL LOPA LOPB NXAD NEXT FHL FOUT FIN FDE JMP SHLT SUGGESTED ADDITIONS TO DIGITAL GROUP 2 80 CPU BOARD The following comments and fixes have been reported to us by digital group users The data lines from memory to the CPU are not terminated on the Digital Group Z 80 CPU board and because of this the CPU will occasionally get a data byte other than when accessing a non existent memogxkmtqkuwxvs with programs such as the Digital Group Memory Test Routines which use this to find memory limits These lines should be pulled up to 5 through 2 7K resistors 3 9K and 4 7K resis tors have been used with satisfactory results A convenient location to install these pullup resistors is on the eft hand side of the CPU board Above each 2102 location in the first column of IC s two unused plated through holes are pro vided for undershoot clamping diodes The right hand hole is connected to its respective data line Also on the left side of each of these 2102 s are two unused plated through holes for bypass capacitors The pullup resistors may be con nected from the top hole 5 of each of these pairs to the right hand diode pad data line above each 2102 There is glitch on the WRITE line of some 2 80 5 which if not corrected can be a problem With memo ry such as this board
3. trouble shooting and as a pseudo write protect to tect a section of code while de bugging another program WRITE ENABLE SWITCH Switch 52 8 is the WRITE ENABLE switch for the 16K block of memory This switch should be ON for normal operation However if the switch is placed in the OFF posi tion after data has been written into this block the block will be WRITE PROTECTED and the data can be read but not changed This is a very powerful tool for program develop ment and debugging since the data in the write protected block cannot be destroyed by a wayward program You must remember however that data buffers which must be changed by the program must reside outside the protected area MEMORY TESTING An excellent memory testing routine is distributed by the Digital Group which will test both the data integrity and the speed of the memory If this is unavailable to you we have in cluded a test route page 10 which gives the board a some what slow but thorough workout It can be entered in machine code through the programming options in your operating system or in source code through an assembler to use the Digital Group Assembler the mnemonics must be changed from INTEL 8080 mnemonics to Zilog 7 80 mnemonics The routine is initially set up to test a 32K segment of memory starting at 4000 hex and ending at BFFF hex The Starting address may be changed by entering the desired start address at 3001 and 300
4. E RARE TENSES 4 wee EN KAA AAAA A AAAA A MANS ant 52 74t 74153 gt 2 79 5 CONSTRUCTION Keeping the preceding information in mind it is now time to mount the various components and install the ICs into their sockets Orient the board as shown in the component layout then referring to this layout follow the steps below in the order given Figure 6 1 Before inserting any components check for any short circuits in the power distribution lines as follows A If you are working a conductive surface insulate 2 the board with sheet of cardboard or other non conducting material B If the dipswitches on your board have already been installed flip each switch to the OFF position C Measure the resistance between pins 1 and 2 of the edgeboard connector with an ohmmeter see figure 6a The resistance should be nearly infinite A reading below around 3000 ohms indicates a bad switch element and a reading near O ohms indicates an etch bridge or solder bridge between the 5 and ground traces or less likely a shorted bypass capacitor eet 2 5 4 5 f 3 2 4 gt 2 The board is shipped configured an active low memory write strobe
5. ECONORAM USER S MANUAL tte we eee eee ee 3 gii 74 9 ie i gt 5 S a pry i 221 3 ah oe 7 5 6 T ach 3 e uae 46 wy PFS SOAS 8 ee 3 satan A antennal gt lay ee gt 4 ip 4 a gt gt i ge 4 32K x 8 static memory Digital Group Buss using MM5257 TMS40L44 4MHz 21 7 te A ompuKit product from 0000090010 2179 Table of contents ee cece od wey ba wa des 3 ees 3 Parto eRe Ce Gre BOER ee eee te Ses 3 Assembly ce nde a 4
6. 006 EI RAE MDI 6 24 004 MDI 4 MDI 3 19 TD CE gt 2an 001 MDI gt gt g Ww z oo gt on gt 4 Ww gt bok _ 4 4 9 gt Coon w 5 4 2 wW wo MEM WR 5 1 gt gt GND 2 gt 2 090000 R2 52 8 1 53 WE A B C 2 8 ECONORAM COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT 94614 TO CPU DMI MA 11 MA 19 MA 9 MA 8 MA 7 MA 6 5 4 3 2 1 WE A B C CE B CECI CE D CE 01 2 D3 MDI 1 MDI 7 1 12 DIN DIN on DIN 13 1 4 15 5 CHIPS gt gt SIMILARLY 16 ARRANGED 17 A 4 6 DOUT DOUT DOUT 2 3 5 ce 008 MDOT 4 CE ce we 1007 19 8 i ti RONNE EDAT PAGE 2 2 BIT POSITION p 1 2 2 5 ee 1 wo 1 2 3 01 02 004 05 MDOG 07 MDI 12 015 16 MDI ARRAY CONSIS
7. and an active low ROM access strobe line S 100 Systems If you have a standard Digital Group system skip this step If you are assembling your board for use in a non standard system proceed as follows A To configure the board for an active high memory write strobe cut the trace between and w bar w and in Stall a jumper between c and w see figure 6b B To configure the board for an active high ROM access strobe the signal which disables RAM when the ROM is being accessed cut the trace between c and r bar ry and install a jumper between and see figure Figure 6a 3 If you have a conductive work surface remove the material which was insulating the board from it All of the ICs should be oriented so that the pin 1 end is toward the left side of the board Any numbers or other markings should nor mally be right side up with the board oriented normally as shown in the component layout diagram If any markings are upside down the IC may not be correctly instalied A common problem with boards returned for repair is im proper installation of an Sometimes a pin will bend under the IC instead of going into the proper socket contact We Figure 6b recommend inserting each IC halfway and verifying visually that all pins are started into socket Then push the the rest of the way Keeping thi
8. smoothly into the joint too little time may result in a poor joint and too much time may damage the component or the bond between the pad and the board Be especially careful when soldering dipswitches since some internal parts are thermoplastic and are very heat sensitive Clip any excess leads off fairly close to the board to keep them from bending over and touching anything Use eye pro tection while soldering or clipping leads NOTE The use of any type of solder other than a good quality rosin core solder invalidates the warranty Do not use any type of solder paste or corrosive flux under any condi tions ae ees gee ee Te Any modification of this board not approved in advance by Godbout Electronics may void your warranty IDENTIFICATION OF PARTS There are many ICs used in this kit each one must be oriented correctly for proper operation Most ICs have dot near one corner that indi cates pin 1 see figure 3 Sometimes this dot appears in conjunction with a deeply cut notch or circle Other types in dicate the pin 1 end of the IC by a deep notch or a notch within a shallow circle see figure 4 In case of doubt place the IC in front of you so that any identifying numbers read from left to right pin 1 is almost always in the lower left hand corner figure 5 NOTE If there is a recognizable mark for pin 1 always go by that rather than the printing HANDLING
9. 00 000 0100 010 01 20K 5000 120 000 0101 24K 6000 140 000 0110 011 28K 7000 160 000 0111 32K 8000 200 000 1000 100 10 36K 9000 220 000 1001 40K 000 240 000 1010 101 44K BOOO 260 000 1011 48K 000 300 000 1100 110 11 52K 0000 320 000 1101 56K 000 340 000 1110 111 60K FOOO 360 000 1111 NOTE If the desired starting address is represented as a binary number the switch setting represents the 2 3 or 4 most significant bits of that address Once you become familiar with the addresses of the various boundaries you will find it easy to re assign various boundaries you will find it easy to re assign memory blocks without referring to the above table BLOCK DISABLE SWITCHES Switch S2 4 and S2 7 are disable switches for the 8K block and the 16K block respectively These switches should be OFF for normal operation If either switch is moved to the ON position the corresponding block is effectively removed from memory although as long as power is maintained data previously stored in the block is not disturbed and may be re accessed by returning the switch to the OFF position This feature is primarily designed to allow the use ofa partially populated board any block without a full complement of memory ICs must be dis abled to prevent conflicts if other RAM in the system is assigned an address which overlaps that of the incomplete lock However the disable switch can also be used as an
10. 2 hex low byte first The end ing address may be changed by entering the high byte of the address following the last tested byte at 3004 hex if the test is to end at E7FF hex enter E8 at 3004 the memory passes the test it starts over again Three bytes have been left open at MARK 3039 hex to enable you to insert a call to a routine to display the test address if desired if any portion of memory fails the test critical information is stored and the routine enters endless loop at SHLT 3070 hex This jump to itself may be replaced by a jump to a routine which notifies you of the failure or the loop may be terminated by a RESET to your monitor from which you can examine the following locations where the information regarding the failure is stored 3069 FDE test character 306A 1 fill character 306 FHL failure address low high 3060 FOUT data expected at this address 6 FIN data read from this address The difference between FOUT and FIN should indi cate which bit is failing and together with FHL should point to the bad memory IC If several bits are different the problem could be an address decoding problem caused by the failure of one of the support chips 2 79 7 15 19 he maine Un TA 018 17 13 TE oe 11 Ai2 16 gt ECONORAM Alp 19 PAGE 1 oF 2 010 9 MA 9
11. 62 0636 If you have problems or questions which cannot be handled by mail this number can be used to connect you with our tech nical people ONLY during normal business hours 10am 5pm Pacific Time Unfortunately we cannot return calls or accept collect calls LIMITED WARRANTY INFORMATION Godbout Electronics will repair or replace at our option any parts found to be defective in either materials or workmanship for a period of 1 year from date of invoice Defective parts must be returned for replace ment If a defective part or design error causes a Godbout Electronics duct to operate improperly during the 1 year warranty period we will service it free original owner only if delivered and shipped at owner s expense to Godbout Electronics If improper operation is due to an error or errors on the part of the purchaser there may be a repair charge Purchaser will be notified if this charge exceeds 10 00 We are not responsible for damage caused by use of solder intended for purposes other than electronic equipment construction failure to follow printed instructions misuse or abuse unauthorized modifica tions use of our products in applications other than those intended by Godbout Electronics theft fire or accidents Return to purchaser of a fully functioning unit meeting all advertised specifications in effect as of date of purchase is considered to be com plete fulfillment of all warranty obligations assumed by Godbo
12. OF PARTS All integrated circuits may be damaged by static electricity however MOS Cs such as the memory ICs included with this kit more vulnerable than most You can easily accumulate a static charge on your body in the thousands of Volts range by merely walk ing across a rug or sliding into a chair on a dry day If you then touch the pins of an IC this charge can flow through the IC and damage its internal structure Most static discharges destroy the IC immediately but it is possible for a low energy static discharge to puncture the gate oxide in such manner than the IC functions properly for a while but fail some time later as metal migrates into the puncture and finally causes an internal short circuit To prevent this leave the ICs in their protective foil until needed Then before plugging in each IC touch an exposed trace on the board pin 1 or 2 on the edge connector for instance to equalize any residual charge This will force any charge to flow through your body instead of through the pins of the IC Also avoid wearing clothing which has a tendency to generate static charges Such as sweaters almost all synthetic fabrics and so on Industrial users recommend wearing a grounded wrist strap and working on a conductive surface which is grounded to the same point Almost the same pro tection can be achieved by working on a sheet of aluminum foil which is electrically connected to the wrist with a flex
13. TS 64 1 x 1096 STATIC RAMS 2 79 MEMORY TESTING ROUTINE 3000 3003 3005 30048 30 2 388B 388C 300 3018 3813 3814 3815 3816 3017 3018 3019 301 3810 38 1 381 3822 3625 3026 3027 3028 382C 382D 362 3831 3832 3833 3836 3839 303A 383C 3848 3843 3044 3045 3047 3049 304 3040 3858 3051 3052 3055 3056 3059 305 305 385C 305 3062 3065 3067 3069 306 3660 306 306 3072 3075 3076 3079 307 387D 3080 65 1 65 6F 4D 15 66 6E 00 00 10 10 67 6F 51 50 67 25 6B 6D 6E 69 7D 38 38 38 38 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 38 0010 0020 0030 STRT END DONE SCND FILL NEXT MARK NDON LOPB LOPA STAD NXAD FDE FOUT FIN FAIL SHLT LXI MVI STA ADD MOV MVI MVI SHLD XRA MOV MOV MOV MOV MOV LHLD MOV INX CMP JNZ LHLD MOV MOV MOV INX SUB JNZ CMP MOV JZ LDA NOP NOP NOP LDA CMP JZ MOV MOV MVI AD MOV JMP SHLD MOV CMP JNZ INR JNZ MOV INR JNZ LHLD JMP DS DS DS DS DS DS SHLD STA MOV STA XCHG SHLD 4000 A BAGH FIN 16H H CoA 0 0 STAD A BsA AsE AsC STAD H H FILL STAD FAIL AsC H H NDON B SCND STAD 1 FIN STRT
14. We en courage you to take the time to familiarize yourself with the featufes and the circuit design of the board prior to assem bly Several of the features such as independent block organization easy switch assignment of blocks to the desired memory address location switch selectable block disable and write protect have been unavailable to Digital Group System owners until now Upon completion of the board you will discover as thou sands of satisfied ECONORAM owners have discovered the pleasure of using a fine memory board that just works and works and works As the first company to nationally offer memory kits to computer hobbyists we thank you for choosing ECONORAM welcome to the club TECHNICAL OVERVIEW This board incorporates proven static memory tech nology using industrial design techniques and generous safety factors to avoid marginal operation Of the two currently popular approaches to memory design static and dynamic static memories are the over whelming choice in applications where speed simplicity ease of use and reliability must be considered In order to retain data dynamic memory must be con tinually refreshed This board due to its static design will retain data as long as power is applied This is of particular interest to Digital Group owners since the Digital Group system makes use of the unique ability of the Z 80 CPU to take care of dynamic memory refresh rather than using refres
15. d is comparable in cost and power consumption to dynamic memory boards THANK YOU This board is the result of much time work and ex perience on the part of a number of people In addition to thanking you for choosing this board we d like to thank the Phantom and many others for their help with this project We strive for a board that doesn t just work the first time but continues to give reliable operation for a long time If we can be of any help to you in applying this board or if you have any questions please let us know As always we solicit your comments letters and new product suggestions HAPPY COMPUTING Note THE PHANTOM is Doug Bell who pro vided the impetous for producing this kit and then wrote these instructions using a word processor text editor on his Digital Group System which included prototypes of this memory and a disk system of his own design 2 79 1 1 CUSTOMER SERVICE INFORMATION Our paramount concern is that you be satisfied with any Godbout product If this product fails to operate properly it may be returned to us see warranty information below If you have any questions about assembly performance specifica tions or need further information feel free to write us at P O Box 2355 Oakland Airport CA 94614 When writing please be as specific as possible concerning the nature of your query We maintain a 24 hour a day phone for taking orders 415 5
16. fast enough to respond to it the glitch can write garbage into whichever location happens to be on the address buss at the time The problem can be easily cor rected by the addition of a 100 pF capacitor between pin 22 of the Z 80 and ground on the CPU board Two plated through holes connected to these lines are conveniently lo cated near the lower right corner of the Z 80 and may be used to install the capacitor Although the above problems may not be noticeable on your system we feel that the addition of the recommended fixes will add an extra measure of reliability to it and perhaps help you to avoid those inexplicable program crashes These mods will help any system but are mandatory for successful 4MHz operation diode pads ground f 2 line bypa pullup resisto 5 8 required ground memory to CPU data line pullup resistors 2 7K to 4 7K 2102 10 ECONORAM COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT CA 94614 see to pin 22 WRITE 2 80 WRITE line de glitch 100 pf capacitor e NS ground CIRCUIT DESCRIPTION The heart of ECONORAM IX is the MM5257 3L or TMS40L 44 25 memory IC RAM which can store 4096 bits bits of information thus each is x 1 memory IC These are not standard MM5257 TMS40L44 s the memory ICs included in this kit are specifically tested a
17. h circuitry on each individual memory board Unfor tunately while this is a valid and economical approach it precludes the use of the normal system RESET or the use of the WAIT line since the CPU cannot continue to refresh the memory while RESET is held or CPU WAIT is used For ins tance in order to use the Digital Group disk controller with dynamic memory both the controller board and the CPU board must be modified an extra input port bit is required and special software is necessary Econoram is not subject to the above problems because of its static design The individual memory chips used on this board are grouped together to form four blocks of memory two 4K blocks one 8K block and one 16K block Each block may be assigned to any of its respective boundaries i e either 4K block to any 4K boundary the 8K block to any 8K boundary and the 16K block to any of the four 16K boundaries by set ting the starting address with the on board DIP switches no jumpers required Additional features include a write pro tect switch for the 16K block and disable switches for both the 8K and 16K blocks Also included are jumper pads for adapting the board to non standard polarities of the WRITE strobe and the ROM strobe the signal which disables the board when the bootstrap EROM is being accessed No jumpers are required for standard Digital Group systems since traces have been provided to connect the pads for the standard signal po
18. i ble wire attached to a metal watch band or loop of bare wire around the wrist If the aluminum foil can be conveniently grounded it will over even more protection leads over 4 4 ee oe Be Be Oe 1 4 244 component Figure 1 lead feed in solder iron tip where indicated by arrows gt doughnut Figure 2 Figure 5 Figure 3 Figure 4 4 ECONORAM COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT 94614 do not bend 127B eA we SIDE ees IN MADE ae 2 WAN 012 Se Ul i Component Layout 9 2 7 2 ER 0900 RRNA As 4 ieee 1 OPRAH 6 Nena 7 SAMRAT 4 A A 6 Su ve y seen 4 ogee oe A AAAS 6 Sg MORENO p MII OANA OO MEE STYRIA 7
19. larities Extra heavy power supply traces generous bypassing of power supply lines sockets for all integrated circuits careful layout and a double sided solder masked printed circuit board with complete component and switch legends make this a versatile memory board which will give excep tionally long and trouble free service Parts List Upon receipt of your kit check your parts against the list below 1 Econoram IX circuit board INTEGRATED CIRCUITS note the following parts may have letter suffixes and prefixes along with the key numbers given below 64 5257 or TMS40L44 memories 013 076 J 5 741 504 hex inverter U6 U1 2 J 1 741532 quad 2 input OR gate U5 J 1 7415139 decoder demultiplexer U7 1 7415240 TRI STATE buffer U8 4 17415266 ex NOR o c 01 04 OTHER ELECTRONIC COMPONENTS LJ 2 1 resistor packs R2 1 2 2K7 ohm watt resistors red violet red R3 4 1 39 tantalum capacitor C1 28 ceramic capacitors MECHANICAL COMPONENTS i 76 low profile sockets 2 8pole dipswitches 1 2 1 supplied already soldered to board 2 79 3 ASSEMBLY PROCEDURES There is no soldering necessary to complete this kit proper operation depends upon correct identification and handling of the parts used in its c
20. nd designated by the manufacturer as low power high speed Parts These ICs are arranged in rows that are 8 ICs wide each contributing one bit of an 8 bit byte Thus each row store 4K x 8 bits 4K bytes By connecting 8 of these rows together in parallel a total of 32K bytes of memory storage is produced Note that the bit number corresponding to a given column of ICs is indicated along the top edge of the memory array and the row number corresponding to the 4K segment within a given block is indicated along the right hand edge of the array Now that we have this storage there are other aspects to consider in order to be able to make use of it First address ing a specific location in memory and second writing data into the memory or reading data from it The logic diagram on pages 8 and 9 show the address decoding read write control memory array input buffering and output buss driver circuits for the Econoram Each row of memory ICs requires 12 address bits 1 1 to select one unique location of the 4096 available locations These bits are brought onto the board through inverting buffers so as to present only one low power TTL load to the buss and distributed to the 12 address sel ct pins on each of the memory ICs The remaining 4 address bits are also buffered decoded and if they represent a valid address for the board as determined by the settings of the address select switches used to enable the a
21. onstruction Please read this manual thoroughly before assembly SOLDERING TECHNIQUES Though no soldering should be required to complete assembly you may have to touch up an occasional void or heaven forbid even replace a component at some future date The Econoram board is so der masked with a solder resistant coating over the entire board except where solder connections are made This minimizes the chances of getting an unwanted solder bridge between adjacent traces Those who have not previously worked with a solder masked board will find that it takes considerably less solider to make a good joint since the solder does not spread out across the solder pad On this board all soldering should be done on the so der side of the board the back side or side opposite the component side Use a low wattage iron 10 25 watts with a small or PENCIL tip Use a good quality rosin core solder 60 40 alloy Because of the close spac ing of pads we recommend keeping the component leads straight up while soldering see figure 1 Bring the tip of the iron in at an angle touching both the pad and the component lead and feed a small amount of solder in at either side where the tip touches the pad and lead see figure 2 Use only enough solder to fill the joint and make a very small fillet around the lead Keep the soldering iron on the joint only long enough to make sure that the solder has wetted the lead and flowed
22. ppropriate row of memory ICs When a row of ICs is thus enabled it presents the data byte stored at the addressed location to the output buss driver This IC is normally in a high impedance state essen tially disconnected When a valid address has been ceived and a MEMORY READ strobe is received from the PU the output driver places the selected data onto the data buss to the CPU Data to be written into a memory location is buffered and presented to the data in pins of each column of memory ICs However when a memory write strobe is received from the CPU the data is loaded into the addressed location of the enabled row of ICs only When the output of a logic IC changes state it draws a very short high current spike from the power lines If unchecked the electrical noise created by these transient spikes might couple into the logic lines and cause erratic operation of the board To absorb these transients bypass capacitors are liberally placed across the power distribution lines throughout the memory array and at every support IC This board is guaranteed to operate at 4 0 MHz over the full temperature range O to 70 C and to draw less than 3500 mA 3 5 amps The typical measured current draw is less than 3000 mA at cold start up rapidly decreasing to around 2400 to 2800mA as the board warms up It is interesting to note that static RAM technology has progressed to the point at which this high performance static RAM boar
23. s in mind first insert the support ICs and then all of the memory ICs ta 4 Check the board over carefully for errors construc tion If all appears correct assembly of your board is com plete Refer to the following sections for instructions on ad dress selection and switch selectable options 6 ECONORAM IX COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT 94614 MEMORY ADDRESS ASSIGNMENT This board is configured as two 4K blocks one 8K block and one 16K block Each 4K block may be assigned to any ea of memory beginning on a 4K boundary OK 4K 8K K etc The 8K block may be assigned to any 8K bound ary OK 8K 32K 40K etc and the 16K block on any 16K boundard OK 16K 32K or 48K The only other limitation is that the assigned locations should not overlap each other or any other RAM in your system NOTE In the following table 51 is the first dipswitch S2 if the second dipswitch Each dipswitch has eight in dividual switch sections numbered 1 through 8 0 switch off and 1 switch 52 4 7 and 8 are not used for ad dress selection and are explained in the next section STARTING ADDRESS SWITCH POSITION BLOCK D hex split octal 4K 8K 16K 51 1234 52 123 52 56 51 5678 OK 0000 000 000 0000 000 00 4K 1000 020 000 0001 8K 2000 040 000 0010 001 12K 3000 060 000 0011 16K 4000 1
24. ut Electronics This warranty covers only products marketed by Godbout Electronics and does not cov other equipment used in conjunction with said products We are not f sponsible for incidental consequen tial damages Prices and specifications are subject to change without notice owing to the volatile nature and pricing structure of the electronics industry Econoram and are trademarks of W J Godbout TRI STATE is a trademark of National Semiconductor Corp Contents of this booklet 1979 by Godbout Electronics All rights reserved We encourage quotation for the purposes of product review if source if credited 1 2 ECONORAM IX COMPUKIT PRODUCT FROM GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT 94614
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