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/TTY DRIVER TASK FOR RTS-8 / / / / / / / / / /COPYRIGHT (C) 1974 BY DIGITAL EQUIPMENT CORPORATION / / / / / / / / / / /THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE /AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT /CORPORATION. DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY /FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT. / /THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE PURCHASER /UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND CAN BE COPIED /(WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY FOR USE IN SUCH /SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING BY DIGITAL. / /DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE /OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY /DIGITAL. / / / / / / / / / / /TASK DATA BLOCK: CUR= 0 INIWT= 0 IFNDEF KBDEV < KBDEV= 03 TTDEV= 04 > IFNDEF CONSOL <CONSOL=1> /DEFAULT IS CONSOLE IFNZRO CONSOL <TASK= TTY> IFNDEF TASK <TASK= 10> /A GOOD NUMBER FOR TESTING KSFX= KBDEV 10+6001 KCCX= KBDEV 10+6002 KRSX= KBDEV 10+6004 KRBX= KBDEV 10+6006 TSFX= TTDEV 10+6001 TCFX= TTDEV 10+6002 TSKX= TTDEV 10+6005 /PDP 8/E ONLY TLSX= TTDEV 10+6006 /THE RTS-8 TELETYPE DRIVER PRINTS AND INPUTS LINES OR CHARACTER /STRINGS ON A TELETYPE. THE INPUT AND OUTPUT DEVICE CODES OF /THE TELETYPE ARE SPECIFIED (RESPECIVELY) BY THE PARAMETERS /"KBDEV" AND "TTDEV". IF THE PARAMETER "CONSOL" IS NOT DEFINED TO /BE ZERO, THE TELETYPE IS ASSUMED TO BE THE CONSOLE TELETYPE /AND WILL INVOKE THE MCR WHENEVER C IS TYPED ON IT. /THE FORMAT OF TTY DRIVER MESSAGES ARE: /WORD 1 USED AS EVENT FLAG FOR MESSAGE /WORDS 2-3 USED BY RTS-8 /WORD 4 FLAGS WORD - FLAGS ARE: / BIT 0 0=PACKED OUTPUT MESSAGE, 1=UNPACKED / BIT 1 0=PUT CRLF AFTER MESSAGE, 1=DO NOT / BIT 2 0=OUTPUT MESSAGE BEGINS AT WORD 6, 1= OUTPUT MESSAGE / POINTED TO BY WORD 6 / BIT 3 0=INPUT IS LINE ORIENTED, WITH EDITING / 1=INPUT IS COUNT ORIENTED W/O EDITING OR ECHOING / BIT 4 0=PERFORM I/O INDICATED BY OTHER BITS / 1=ASSIGN TTY DRIVER TO TASK IN BITS 5-11 / BITS 5-11 MAX # CHARS IN INPUT BUFFER (0 MEANS 4096) / OR TASK TO ASSIGN DRIVER TO (IF BIT 4=1) /WORD 5 IF ZERO, NO INPUT - ELSE POINTS AT INPUT BUFFER /WORD 6 OUTPUT MESSAGE OR POINTER TO MESSAGE FIELD CUR%10 *3000 MEVFLG, START, CAL FLAGS, SKPINS HALF, TTINT IFZERO PDP8E < /ONLY NEED 1 SKIP CHAIN ENTRY ON 8/E CAL SKPINS KBINT > TTMSLP, TAD ASGNEE /GET ASIGNEE (IF ANY) CAL RECEIV /TAKE THE MESSAGE OFF THE Q MADDR, 0 /GETS ADDRESS OF MESSAGE DCA MSGCDF /FIELD OF MSG IN AC AC7775 TAD MADDR DCA MEVFLG /SAVE MESSAGE EVENT FLAG ADDRESS JMS CDFMSG TAD I MADDR DCA FLAGS /FIRST WORD OF MESSAGE IS FLAGS ISZ MADDR TAD I MADDR DCA REPLYY /2D WORD OF MESSAGE IS ADDRESS FOR ISZ MADDR /REPLY FROM KBD (0 IF NONE WANTED) TAD FLAGS AND (200 SZA CLA /IS THIS AN ASSIGN CALL? JMP ASSIGN /YES - JUST ASSIGN TTY TO SENDER TAD FLAGS RTL SMA CLA /BIT 1000 OF FLAG WORD INDICATES JMP .+3 /IF MESSAGE OR POINTER TO IT FOLLOWS TAD I MADDR DCA MADDR STA DCA HALF /INITIALIZE LEFT/RIGHT SWITCH /LOOP TO UNPACK AND OUTPUT MESSAGE TTOLP, JMS CDFMSG TAD FLAGS SPA CLA /BIT 0 IF FLAG WD TELLS WHETHER JMP ONEPWD /MESSAGE IS PACKED OR UNPACKED ASCII ISZ HALF /PACKED - WHICH HALF? JMP RGHTHF AC7776 DCA HALF TAD I MADDR CLL RTR RTR RTR JMP .+3 RGHTHF, TAD I MADDR ISZ MADDR AND (77 SNA JMP CKCRLF TAD (240 /CONVERT SIXBIT TO ASCII AND (77 TAD (240 OUTCH, JMS TTOUT JMP TTOLP ONEPWD, TAD I MADDR ISZ MADDR SZA JMP OUTCH CKCRLF, TAD FLAGS RAL /BIT 1 OF FLAGS TELLS WHETHER SMA CLA /TO FOLLOW MESSAGE BY A CR/LF CTRLU, JMS CRLF TAD REPLYY SZA /IS THERE INPUT REQUIRED? JMP I (EOMESS /YES - GO GET IT EORPLY, CDF CUR /HERE IF NO INPUT OR IF INPUT FINISHED TAD MSGCDF DCA MF TAD MEVFLG CAL /POST THE SENDER'S EVENT FLAG POST /SO HE'LL KNOW HE GOT HIS INPUT MF, 0 JMP TTMSLP /NNNNNNNNNNNNNNNNNNNEXT! ASSIGN, TAD FLAGS AND (77 /GET TASK NUMBER DCA ASGNEE /SAVE AS ASSIGNED TASK JMP EORPLY ASGNEE, 0 /TASK ASSIGNMENT - 0 MEANS UNASSIGNED REPLYY, 0 /ADDRESS OF REPLY BUFFER (IF ANY) /LOW-LEVEL TTY OUTPUT CODE TTOUT, 0 DCA CDFMSG CDF CUR TAD I (INCH /GET THE LAST CHAR TYPED ON THE KEYBOARD AND (177 /STRIP OFF PARITY TAD (-17 /WAS IT O? SNA CLA JMP I TTOUT /YES - DON'T PRINT NOTHIN CAL WAITE /WAIT FOR LAST CHAR TO FINISH PTTOEV, TTOEV ISZ TTOEV /SET TTY BUSY (IN ADVANCE) TAD CDFMSG /GET CHAR TLSX /OUT WITH IT! CLA /CL(E)A(N) UP JMP I TTOUT CRLF, 0 TAD (215 JMS TTOUT TAD (212 JMS TTOUT JMP I CRLF TTINT, ZBLOCK 2 /USED FOR LINKING INTO SKIP CHAIN IFZERO PDP8E <TSFX> IFNZRO PDP8E <TSKX> /CHECK FOR KEYBOARD OR PRINTER JMP I TTINT CDF CIF CUR IFNZRO PDP8E < TSFX /WHICH ONE? JMP I (KBINT /KEYBOARD > CIF 0 TCFX TAD PTTOEV POSTDS /POST "TTY COMPLETE" EVENT FLAG TTOEV, 0 CDFMSG, 0 MSGCDF, HLT JMP I CDFMSG PAGE /INPUT REPLY FROM KEYBOARD EOMESS, DCA REPLY /SAVE REPLY BUFFER POINTER IN THIS PAGE CDF CUR TAD I (FLAGS AND (177 /GET LOW ORDER BITS OF FLAG WORD CIA RPLYL1, DCA INPCNT /SET INPUT CHAR COUNT RPLYLP, CAL WAITE PTTIEV, TTIEV /WAIT FOR KEYBOARD STRIKE ISZ TTIEV /IMMEDIATELY SET EVENT FLAG AGAIN TAD I (FLAGS JMS I (CDFMSG AND (400 /ARE WE EDITING INPUT? SZA CLA JMP NOEDIT /NO - JUST TAKE IT AS IT COMES TAD INCH AND (177 /STRIP PARITY BIT TAD (200 /NOW FORCE IT BACK IN DCA I REPLY /SAVE CHAR IN REPLY MESSAGE TAD I REPLY AND (177 /AND OUT GOES THE PARITY BIT (AGAIN) SZA TAD (-17 /IGNORE NULL AND O SNA JMP RPLYLP TAD (17-176 SMA SZA JMP RUBOUT /X - 176 GT 0 - X MUST BE 177 SZA IAC SZA TAD (175-33 /CHECK FOR 3 FLAVORS OF ALTMODE SNA JMP ALTMOD /ALT MODE IS SPECIAL END-OF-LINE DELIMITER TAD (33-15 SNA /IS THE CHAR A CARRIAGE RETURN? JMP CARRET CDF CUR TAD (15-25 SNA CLA / U? JMP I (CTRLU /YES ISZ INPCNT /IS THERE ROOM IN THE BUFFER? JMP .+3 /YES STA JMP RPLYL1 /NO - KEEP IT FULL JMS I (CDFMSG TAD I REPLY /GET THE CHAR JMS I (TTOUT /ECHO IT NEXTCH, ISZ REPLY /BUMP POINTER JMP RPLYLP /CONTINUE INPCNT, 0 /SPECIAL CHARACTER PROCESSING RUBOUT, CDF CUR TAD I (REPLYY /AC=1 ON ENTRY! CIA TAD REPLY /ARE WE AT THE BEGINNING SPA CLA /OF THE REPLY LINE? JMP RPLYLP /YES TAD (334 JMS I (TTOUT /OUTPUT A BACKSLASH STA TAD REPLY DCA REPLY /BUMP THE POINTER BACK ONE STA TAD INPCNT /REMEMBER TO INCREASE THE COUNT! JMP RPLYL1 ALTMOD, TAD (44 JMS I (TTOUT /ECHO ALT MODE AS $ STA /PUT SPECIAL DELIMITER IN MESSAGE JMS I (CDFMSG CARRET, DCA I REPLY /SET THE LAST CHAR IN THE MESSAGE JMS I (CRLF JMP I (EORPLY NOEDIT, TAD INCH DCA I REPLY /NO PARITY, NO EDITING, NO ECHOING ISZ INPCNT /IF CONSOL=0, THIS MODE CAN JMP NEXTCH /BE USED TO READ BINARY PAPER TAPES JMP I (EORPLY /KEYBOARD INPUT INTERRUPT ROUTINE AND STORAGE KBINT, IFZERO PDP8E < ZBLOCK 2 /FOR LINKING INTO SKIP CHAIN KSFX JMP I KBINT CDF CIF CUR > KRBX /READ CHARACTER AND CLEAR FLAG DCA INCH IFNZRO CONSOL < TAD INCH AND (177 TAD (-3 SNA CLA /CHECK FOR C TYPED JMP GETMCR /YES - SET "MCR REQUESTED" EVENT FLAG > CIF 0 TAD PTTIEV POSTDS /POST "KEY STRUCK" EVENT FLAG IFNZRO CONSOL < GETMCR, TAD TTIEV / C WILL DELETE ANYTHING WHICH SNA CLA /IS CURRENTLY IN THE TTY BUFFER ISZ TTIEV /BY SETTING THE EVENT FLAG NON-ZERO CDF CIF 0 /THE MCR IS STARTED UP (IF QUIESCENT) BY TAD (MCREF /POSTING THE MCR EVENT FLAG IN PAGE 0 POSTDS /OF FIELD 0. > REPLY, 0 INCH, 0 TTIEV, 1 /KEYBOARD NOT STRUCK INITIALLY PAGE $$$