Contents
1. cont d NAME PLUS MINUS SLASH APOSTROPHE LOGICAL AND G ASTERISK EQUALS SEMI COLON LEFT PAREN RIGHT PAREN COMMA PERIOD QUESTION MARK LOGICAL OR Carriage Control BACK backspace RETURN carriage return TAB advance to next tab UP line feed up ENL line feed up DOWN line feed down CON line feed down RS position to upper left of display area ERASE BREAK for display scope RETURN for line printer SPACE SPACE blank NOTE 59 77 06 07 28 13 BC 79 NAME UNDERSCORE AT SIGN POUND SIGN CENT SIGN 4 DOLLAR SIGN PERCENT SIGN COLON LEFT BRACKET RIGHT BRACKET LESS THAN lt GREATER THAN gt QUOTE LOGICAL NOT gt EXCLAMATION Special List Mode Characters SPACE POST LIST DIVIDE MULTIPLY SUBTRACT Q ADD CARRIAGE RETURN PA DELETE Ea POINTER Miscellaneous DOT curvilinear display dot dot mode 78 Codes are specified in hexadecimal and are eight bits ss means superscript B CURVILINEAR OUTPUT CLASS 2 For curvilinear output the output class field contains the following Bits 0 1 00 indicates line segment mode adjacent display points are to be connected by straight lines Ol indicates dot mode AO indicates character mode the class dependent field contains a character from Figure 2 which is to be displayed at each point2. With the exception of the first byte data transmitted over the Output Connection by the Interface consists of a continuous string of variable length records The first byte sent consists of zeros indicating message type zero to comply with Host Host protocol and should be discarded by the user At present there are three classes of records defined one corresponding to each class of OLS output alphameric curvilinear and special characters Only records of those classes which have been enabled by the user will be transmitted all other output will be suppressed locally by the Interface Each record consists of a one byte field specifying the output class a one byte output class dependent field a variable length data field and a two byte field containing the combined length in bits unsigned of the data and output class dependent fields Each record has the following form The integer above each field is the length of that field in bytes except where stated to the contrary The length of a record then is given in bits by the contents of the length field plus twenty four The significance of the data and class dependent fields and the output class assignments are given in the following sections for each output ciass A ALPHAMERIC OUTPUT CLASS 1 For alphameric output the output class field contains the following Bits 0 3 unpredictable Bits 4 7 0001 The contents of the class dependent field are unpredicta
3. and horizon tally and a character frame is 160 units wide and 224 units high The sixteen characters which define move operations are listed in Figure 3 and each is one byte long Such a character indicates a move from the current position in the specified direction a distance equal to that E of a move in the same direction from the center of a 64 unit square to its perimeter The length of the move is therefore functionally related to its direction A change in position relative to the lower right corner of the last character frame is represented by a four byte character of the form l 12 bits 12 bits x 70Q A X A Y where A X and A Y are signed quantities indicating the number of units change along each coordinate Sou FIGURE 3 SPECIAL CHARACTER VECTOR CHARACTER SET w iii DIRECTION CODE 000 0 47 022 5 48 045 0 51 067 5 52 090 0 53 112 5 54 135 0 55 157 5 56 130 0 57 202 5 58 225 0 41 247 5 42 270 0 43 292 5 44 315 0 45 337 5 46 NOTE Codes are specified in hexadecimal and are eight bits Directions are specified in degrees increasing counter clockwise from 0 at positive X in an X Y coordinate system
4. dot dot mode is character mode with the display character DOT X178 Ja l Bits 2 3 unpredictable Bits 4 7 0010 For character mode the classsdependent field contains the display character in other cases the contents of that field are unpredictable The data field contains a list of X Y display coordinates as depicted below X and Y are the x and Y display coordinates after sCaling of the i component of the vector represented by this record Each coordinate is contained in a two byte field therefore one component in four bytes and hence the context of the vector being displayed is given by the contents of the length field minus eight divided by thirty two The assumed display area is square with origin at lower left and both X and Y ranging between 0 and 4095 There is a one to one correspondence between vectors displayed and curvilinear output records transmitted C SPECIAL CHARACTER OUTPUT CLASS 3 For special character output the output class field contains the following Bits 0 3 unpredictable Bits 4 7 0011 The contents of the class dependent field are unpredictable The data field contains a contiguous string of variable length characters each representing either a move in one of sixteen directions or a change in position relative to the lower right corner of the last character frame where for alphameric and special character display the display area is square 4096 units in extent vertically
5. he is in contact with the Interface If rejected he should re issue the connection request when accepted he will be connected to the Interface A second rejection would indicate that the On Line System was inactive or that either the Interface or the NCP had exhausted its resources Over this initial connection the Interface will send eight bits of zeros indicating message type zero followed by a 32 bit socket number which it will select from a pool of socket numbers ailocated to it It will then promptly close the connection and re issue the listen to allow other users to begin login It will then request con nection of the local socket whose number was sent to the user with the foreign socket whose number is one greater than that of the user s socket Similarly it will request connection of the local socket whose number is one greater than that sent to the user with the user s socket Once these two connections have been established the Interface will consider the user logged in The two connections thus established are maintained indefinitely by the Interface Over its receive connection hereafter termed the Input Connection the Interface accepts input for OLS Over its send connection the Output Connection the Interface relays displays from OLS generated in response to the input The Interface will terminate these connections only should the On Line System terminate The user is expected to close the two connection
6. LA y A NETWORK WORKING GROUP Jim White REQUEST FOR COMMENTS 74 UCSB 16 Oct 70 SPECIFICATIONS FOR NETWORK USE OF THE UCSB ON LINE SYSTEM INTRODUCTION UCSB s On Line System OLS is available to Network users as socket number x 1l01 at site 3 Network users should log in with the following OLS accounting parameters USER NUMBER 196 ID NUMBER 57372 USER NAME site name UCLA SRI UTAH BBN MIT SDC RAND whichever is appropriate Users communicate with OLS through an intermediary process hereafter called the Interface which is addressed as socket number x 101 which is termed OLS s primary socket and can be invoked through the Logger This document is intended to provide programmers with the infor mation necessary to communicate with the Interface and to define the input expected and the output returned The reader is assumed familiar with the Culler Fried system at UCSB from a user s standpoint Specifically this document is not a user s manual for OLS The Interface conducts all Network transactions through the NCP which operates under the Host Host protocol of 3 August 70 The first message sent by the Interface is of Type 0 the first eight bits are zeros and thereafter for the life of the connection Imp message boundaries are not significant Similarly the Interface expects the first message it receives to be Type 0 discards the first eight bits assuming them to be zeros and thereafter for the lif
7. WN YAL P AX 55 ES TX pe o b AN US Moc N k a AA EN yon DARE po xP po yo y EL pomv k se pre Mn De On a ay yr aa a TARA e m A n a En OU n pal et ahir ag Nae ko n e A ASA ie sak kom MES 2E _ A A A A A A A e ee Fre DAR id E 1 A ma Se A oS ni eee e AA eT A ae aa A O yen 8 ve en 0 sol SA HO vc z C rel EN TET DI as Be De gen A tt mo ee ee Tu e ank LAN A 44 B e B213 pali a gu 5 ys b Be Bi Fuld rel fal rulo FS n HE ol MEEA EPSILON li HO de 7 swe m 5 R T E3 y ES A Ya a a E l a DE ma Sb Gan E pie ee mwen k m ii 73 an 7 J ze Q aK T Says Si y pale D3 a mn ISIT FO OA y a CM a e i q E N AS E M gu lt Hele Ge TE e Y es 5 ce PIN os M pul gals el Ki ie oes a a ad sad ai ar n eTe t ka ji j E Vi CE ki AS ETURN 5 T fan A RETE ba Treat manmi sate A ad A Ban ME kip penk nov Matas D oka Zot A Y A Yn kn Tis kk A menen ee mu PO O O pe epa pl iii o HL da ba Ak Ir a a pk an ete e y a ls 58 2 se 70 o Jomes p DE n mE TA TAB Ih a 10 Do P pij 50 Sole ix Se ye FI ee e TE Es HE CISMA AL we ETA B TA SF pack ERASE Mat A TA a saa n Me maw 1m TTEN 1a et ea A a e mme on aa y if kis A Aa TEE ART TET S Figure La INPUT KEY CODE SET THE OUTPUT CONNECTION
8. ble The data field contains the alphameric display in the form of a contiguous string of one byte characters Any char acter listed in Figure 2 may be present The list includes the Greek and Latin alphabets a variety of special symbols as well as carriage control characters such as carriage return line feed backspace and erase Alphameric output records embody system generated messages LIST mode displays lower key board activity on the TYPE level TYPE level operators such as UP and DOWN etc The appearance of the character pair BACK ERASE x 59BC in a record represents a command to erase the display scope When not immediately followed by ERASE BACK indicates a backspace operation BREAK x 79 is used to facilitate formatting of long messages that may be either printer or display scope destined in generating scope display where there are twenty five characters per line BREAK should be interpreted as a carriage return in generating printer output where longer lines are possible it shouid be interpreted as a space or blank FIGURE 2 Lower NAME Case 00 YOU BAN MON NMES OHOJNMXIVWAOTUTO ZA an THO MMT Ow tr ALPHAMERIC OUTPUT CHARACTER SET a NAME ALPHA BETA CHI DELTA EPSILON PI GAMMA THETA IOTA SIGMA KAPPA LAMBDA MU ETA OMICRON PI PHI RHO SIGMA TAU UPSILON NU OMEGA XI PSI ZETA ss 55 55 55 ss 55 ss SS SS 55 Oman AM 1 MN ro Upper Case
9. e of the connection takes no notice of Imp message boundaries A word about terminology The 360 75 is a 32 bit machine but its instruction set is byte oriented A byte is eight bits and those eights bits are numbered 0 7 from left to right Terms such as listen request connection accept a connection and reject a connection are used freely herein to describe those primitive Network functions which a user at a foreign site presumably has available to him through his NCP They are used here in the same senses in which they have frequently been used in the NWG literature LOGGING INTO THE INTERFACE To use the On Line system the Network user must establish a full duplex connection with the Interface The Interface is core resident only while at least one such duplex connection is established i e while at least one Network user is connected At all others times the Interface resides on direct access storage and must be invoked through the Logger A login sequence can always be initiated by requesting connection to OLS s primary socket While in core the Interface listens on that socket and will accept any call it receives at all others times the Logger listens on that socket and will reject the first call it receives read the Interface into core and dispatch it The Interface will then listen on the primary socket as before Thus to initiate a login sequence the user requests connection to the primary socket If accepted
10. nificance is attached to Imp message boundaries The second byte of data received is not passed to OLS but is examined by the Interfaces By appropriately selecting that second byte the user can cause to be suppressed by the Interface any or all of the three classes of output generated by OLS and potentially relayable to the user over the Output Connection The byte is interpreted as follows Bit 0 l suppress all alphameric output Bit 1 1 Suppress all curvilinear output Bit 2 1l SUppress all special character output Bits 3 7 not examined should be zeros Once made this declaration prevails for the life of the Network connections A user can avoid transmission of output classes he is unable to process and would therefore have to discard anyway thus avoiding neediess Network traffic A user operating from a teletype and capable of displaying only alphameric output for example might specify x 60 and thereby suppress all else LS ES IS AE Aa ME IS TI sd ii A to a PA E ARA A A RT DE A y Er AA ek AE Aa VA rre aa i i mm gan j i 14 er T VA l VI VI REAL Wi e YPE IS Wen 30 t Zi 32 L pie K Za V 35 ZA V kab R Be J s ae pi SC L SD SY A ee iy RA YE mn l A Mennen Ate A aswe oa man ie ec LM ROD ORT PL D EST 3 su Via a von aa e lees ESCAPE EE Z FIKESET sel TOT A A A a ee is mon 3 se MaS pou we pren op a e a e aa FL P O
11. s when finished making the local sockets available for reallocation at which time the Interface will consider the user logged off THE INPUT CONNECTION With the exception of the first two bytes data received by the Interface over the Input Connection is treated as a continuous stream of one byte key codes potentially endless in extent The Interface passes each key code unexamined to the On Line System which in turn processes it exactly as it would input from a key board connected directly to the System The set of valid key codes and its relation to the standard OLS key board are depicted in Figure 1 The Interface makes no validity check of the incoming data but OLS will detect and dis card invalid key codes Normally the first keys sent over the Input Connection i e the first keys that the Network user pushes should be those necessary to log in to OLS The user may log in and out many times during the life of the Network connection anda these Operations are transparent to the Interface The last keys sent over the Input Connection should log the user off of OLS SYST DOWN Failing to log off before terminating the Network connection allows the possibility of a later Network user s finding himself already logged in The first byte of data received over the Input Connection is discarded unexamined by the Interface which assumes it to be zeros indicating message type zero in compliance with Host Host protocol No sig
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