File: DTCOPY.PA of Tape: OS8/OS8-V3D/al-4695c-sa-os8-v3d-5
(Source file text)
/DECTAPE COPY, V10 / / / / / / // / / / / /COPYRIGHT (C) 1966, 1975 /DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS. / / / /THIS SOFTWARE IS FURNISHED UNDER A LICENSE FOR USE ONLY ON A /SINGLE COMPUTER SYSTEM AND MAY BE COPIED ONLY WITH THE INCLU- /SION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE, OR ANT OTHER /COPIES THEREOF, MAY NOT BR PROVIDED OR OTHERWISE MADE AVAILABLE /TO ANY OTHER PERSON EXCEPT FOR USE ON SUCH SYSTEM AND TO ONE WHO /AGREES TO THESE LICENSE TERMS. TITLE TO AND OWNERSHIP OF THE /SOFTWARE SHALL AT ALL TIMES REMAIN IN DEC. / / /THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT /NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL /EQUIPMRNT COROPATION. / /DEC ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS /SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DEC. / / / / / / /DECTAPE COPY /VERSION .B07 / / /COPYRIGHT 1968 DIGITAL EQUIPMENT CORPORATION / MAYNARD, MASS. OCTOBER,1968 / THIS PROGRAM COPIES A DECTAPE FROM ONE / SPECIFIED UNIT TO ANOTHER. ALL DECTAPE / ROUTINES ARE INTERNALLY GENERATED SO THAT / IT MAY BE RUN WITHOUT THE MONITOR SYSTEM. / / STARTING ADDRESS IS 200 / DTRA=6761 DTCA=6762 DTXA=6764 DTSF=6771 DTRB=6772 DTLB=6774 WC=7754 CA=7755 / THESE AREAS ARE USED BY DATA BREAK BUFIOT=1547 /INPUT OUTPUT BUFFER BUFCHK=4563 /RE-READ BUFFER / *20 / PAGE ZERO WORKING STORAGE BADTRY, -3 /COUNT OF READ ERRORS CURBLK, 0 /CURRENT BLOCK NUMBER TRASH1, 0 /WORKING STORAGE TRASH2, 0 /WORKING STORAGE TRASH3, 0 /WORKING STORAGE BLKCNT, 0 /NUMBEROF BLOCKS TO READ /OR MINUS THAT NUMBER SORBLK, 0 /STORAGE FOR CURBLK WORDS, 0 /NUMBER OF WORDS PER BLOCK INUNIT, 0 /INPUT UNIT IN LH OCT CHAR OUTUNI, 0 /OUTPUT UNIT IN LH OCT CHAR RESTOR, 0 /NUMBER OF WORDS TO COPY RESAVE, 0 /NEGATIVE OF BLKCNT SMICAR, 0 /CHARACTER STORAGE SMISUM, 0 /RUNNING SUM SPELIN, 0 /POINTER SEAZIK, 0 /INPUT AREA SEAZOK, 0 /TEMP STORAGE DECTWC, 0 /FLAG TO DETERMINE IF VALIDATION WILL OCCUR DECTCA, 0 /CURRENT ADDRESS STORE FIRST, 0 /STARTING BLOCK NUMBER LAST, 0 /LAST BLOCK NUMBER LENGTH, 0 /NUMBER OF WORDS TO COPY PARITY, 0 /PARITY ERROR FLAG (COUNT) MSKIN, 0 /NEGATIVE OF INUNIT PARDEL, PSTACK /POINTER TO PARITY TABLE / / PAGE ZERO SUBROUTINES DIREC, 0 CLA DTRA /FIND DIRECTION AND [400 SZA CLA /BRANCH BACK ISZ DIREC /REVERSE DIRECTION EXIT JMP I DIREC /FORWARD DIRECTION EXIT / / BACKUP, 0 /SUBROUTINE REWINDS TAPE CLA DTRA AND (670 /CLEAR DIRECTION AND MOVEMENT DTXA TAD (600 /GO IN REVERSE DTXA DTSF JMP .-1 /WAIT UNTILL DONE JMS I [ERROR /BUSYWORK FOR ERRORS JMP I BACKUP /EXIT ON ENDZONE ERROR JMP BACKUP+1 *200 BEGIN, CLA CLL /INITIALIZE DTLB TLS /TELETYPE OUTPUT JMS I [SPEAK MESS0 JMS I [SPEAK MESS1 /INPUT UNIT NUMBER JMS GETNUM /CHECK INPUT UNIT NUMBER DCA INUNIT TAD INUNIT CIA /SET UP INPUT UNIT MASK DCA MSKIN JMS I [SPEAK MESS2 /OUTPUT UNIT NUMBER JMS GETNUM TAD MSKIN /MAKE SURE UNITS ARE DIFFERENT SNA JMP BEGIN /INPUT ERROR TAD INUNIT DCA OUTUNI JMS I [SPEAK /GET FIRST BLOCK NUMBER MESSA JMS I [SMIGIT NOP DCA CURBLK TAD CURBLK CIA /STORE BEGINNING MARKER DCA FIRST JMS I [SPEAK /GET LAST BLOCK NUMBER MESSB JMS I [SMIGIT CLA CMA /KLUDGE IF NO INPUT DCA LAST TAD FIRST CLL SZA TAD LAST /MAKE SURE VALID SZA SNL CLA JMP BEGIN DTLB TAD INUNIT /INIT INPUT UNIT JMS I [FIXTAP DCA WORDS /SET UP BLOCK LENGTH TAD OUTUNI /INIT OUTPUT UNIT JMS I [FIXTAP CIA /MAKE SURE BLOCK LENGTH TAD WORDS /SAME ON INPUT AND OUTPUT SZA CLA JMP BADLEN /BLOCK LENGTH ERROR JMS I [SPEAK /TYPE OUT BLOCK LENGTH MESS3 TAD WORDS JMS I [TYPNUM JMS I [SPEAK /SEND <RETURN><LINE FEED> MESS0+11 TAD WORDS CIA /COMPUTE NUMBER OF BLOCKS DCA LENGTH /TO READ AND WRITE DCA BLKCNT /CLEAR BLOCK COUNTER TAD [3014 /LOAD BUFFER SIZE TAD LENGTH SPA JMP BADLEN /TOO MANY WORDS PER BLOCK ISZ BLKCNT /TALLY TAD LENGTH SMA JMP .-3 /CONTINUE COUNTING TAD WORDS /GET NUMBER OF TAD [-3014 /WORDS TO READ CIA /AND TO WRITE DCA RESTOR /PRESERVE IN RESTOR TAD RESTOR DCA LENGTH TAD BLKCNT /SAVE NEGATIVE OF BLKCNT CIA DCA RESAVE JMS I [SPEAK MESSC JMS I [SMIGIT NOP DCA DECTWC /SET UP VERIFY FLAG / / MAIN LOOP FOR COPY LETS, TAD CURBLK /CHECK FOR PARTIAL BLOCK TO COPY TAD BLKCNT CLL CMA IAC TAD LAST SZL JMP LETT /COPY FULL LENGTH DCA LENGTH /ADJUST WORDS TO COPY TAD RESTOR CIA TAD WORDS ISZ LENGTH JMP .-2 /COMPUTE PROPER LENGTH CIA TAD WORDS DCA LENGTH TAD [REVERS /KLUDGE COPY EXIT DCA I [COPY JMP I [COPY+1 /PERFORM THIS COPY LETT, JMS I [COPY /COPY THIS BLOCKS TAD BLKCNT TAD BLKCNT /ADVANCE CURRENT BLOCK TAD CURBLK DCA CURBLK JMS DIREC JMP LETU /FORWARD EXCEEDED CHECK LETR, TAD CURBLK /REVERSE CHECK TAD FIRST CMA SZA CLA /CHECK FOR MINUS 1 JMP LETT /CONTINUE COPY JMP I [DONE /FINISHED JOB LETU, TAD CURBLK CLL CMA IAC TAD LAST SZL CLA /CHECK FOR END OF TAPE JMP LETS JMP I [REVERV / THIS SUBROUTINE GETS INPUT / AND OUTPUT UNIT NUMBERS FROM / THE TELETYPE AND VALIDATES THEM. / GETNUM, 0 JMS I [SMIGIT NOP AND [7 CLL RTR /MOVE TO LH THREE BITS RTR JMP I GETNUM / / BADLEN, JMS I [SPEAK /BLOCK LENGTH ERROR MESS3A JMP BEGIN / / / PAGE / / THIS TURN AROUND IS ENTERRED / WHEN THE LAST COPY MOVED INTO / THE FINAL DATA AREA REVERV, TAD LAST DCA CURBLK /START OF COPY BACK JMS REVALT /CHANGE INUNIT AND OUTUNI TAD INUNIT DTCA DTXA JMS I [RESET /REPOSITION TAPE TAD OUTUNI DTCA DTXA JMS I [RESET /REPOSITION TAPE REBACK, TAD CURBLK CMA /COMPUTE NEW COPY LENGTH TAD SORBLK TAD BLKCNT SNA JMP REVERS /KLUDGE IF NOTHING TO DO DCA SORBLK /MINUS # OF BLOCKS TAD SORBLK DCA BLKCNT /SAVE THIS NUMBER TAD WORDS ISZ SORBLK JMP .-2 DCA LENGTH /LENGTH FOR COPY JMS I [COPY /PERFORM IT TAD CURBLK TAD BLKCNT TAD RESAVE /ADVANCE CURBLK DCA CURBLK TAD RESAVE DCA BLKCNT TAD RESTOR DCA LENGTH JMP I [LETR /CONTINUE COPY / / / THIS TURN AROUND IS ENTERRED / WHEN THE LAST SEARCH FOR / CURRENT BLOCK CAUSED AN END / OF TAPE ERROR / REVERT, JMS DIREC SKP JMP I [DONE /FINISHED IF DIRECTION REVERSE TAD SORBLK DCA CURBLK /RESTORE CURBLK TAD OUTUNI /RESET LOCATION OF DTCA DTXA /OUTPUT DECTAPE AND JMS I [RESET /FIND LAST BLOCK TAD [4000 /BY LOOKING FOR IMAGINARY JMS I [SEARCH /BLOCK NUMBER (KLUDGING SEARCH) NOP JMP .-3 /TRY AGAIN ON ERRORS TAD SEAZIK /MUST BE LAST BLOCK NUMBER DCA CURBLK JMS REVALT /CHANGE INUNIT AND OUTUNI JMP REBACK / / / THIS TURN AROUND IS ENTERRED WHEN THE / END BLOCK FOR COPY WAS REACHED BY A / PARTIAL BUFFER COPY. / REVERS, CLA CMA /ADJUST CURBLK POINTER TAD SORBLK DCA CURBLK TAD RESAVE DCA BLKCNT /MAKE BLKCNT NEGATIVE TAD RESTOR DCA LENGTH /RESTORE COPY LENGTH JMS REVALT /CHANGE INUNIT AND OUTUNI JMP I [LETR / REVALT, 0 TAD OUTUNI TAD [400 DCA OUTUNI /REVERSE DIRECTION TAD INUNIT TAD [400 DCA INUNIT /REVERSE DIRECTION JMP I REVALT / /THIS SUBROUTINE PERFORMS THE OPERATION /OF COPYING N BLOCKS AND VALIDATING /THE OUTPUT. /WHEN END OF TAPE IS REACHED THE ROUTINE /BRANCHES TO "REVERS", OR TO REVERT /AS APPROPRIATE. / COPY, 0 KSF /CHECK FOR <^C> JMP .+5 KRB TAD [-203 SNA JMP I [7600 CLA TAD INUNIT /LOAD STAT REG A DTCA DTXA TAD [-3 DCA BADTRY /RESTORE ERROR COUNTER JMS I [DECTAP COPO, BUFIOT /INPUT AREA 30 /READ CODE NOP /NORMAL RETURN TAD PARITY /CHECK PARITY FLAG SZA JMP I [ERRPAR /FIX MESSAGE FOR PARITY ERRORS COPZ, TAD OUTUNI /(IGNORE END ZONE) DTCA DTXA /OUTPUT UNIT & DIRECTION COPYB, JMS I [DECTAP /WRITE OUTPUT TAPE BUFIOT /OUTPUT BUFFER 50 /WRITE CODE JMP COPCPR /NORMAL RETURN TAD [REVERS /END ZONE RETURN DCA COPY /FIX UP EXIT COPCPR, TAD CURBLK DCA SORBLK /STORE CURRENT BLOCK NUMBER TAD DECTWC SZA CLA JMP I COPY /NO VERIFICATION JMS I [RESET /RETURN TO FRONT END JMS I [DECTAP /READ DATA COPR, BUFCHK /INPUT AREA 30 /READ CODE JMP .+2 /NORMAL RETURN BRANCH TAD I [WC /END ZONE RETURN TAD LENGTH CIA DCA TRASH3 /COUNTER TAD COPO DCA 17 /FORWARDS POINTER TAD COPR /REREAD BUFFER DCA 16 /SET UP POINTER COPCML, TAD I 16 CIA TAD I 17 SZA JMP COPERR /MISMATCH ON READ ISZ TRASH3 /ANY MORE WORDS JMP COPCML /LOOP JMP I COPY /MADE IT! EXIT COPERR, ISZ BADTRY /HOW MANY ATTEMPTS JMP COPERS /TRY AGAIN JMS I [SPEAK MESS5 /RE-READ ERRORS JMS I [TUNIT /TYPE UNIT NUMBER AND WAIT TAD [-3 DCA BADTRY /RESTORE ERROR COUNTER COPERS, CLA JMS I [RESET JMP COPYB /WRITE OUT BLOCK AGAIN / PAGE / THIS SUBROUTINE MOVES THE DECTAPE / BACK IN PREPARATION FOR ANOTHER / READ OR WRITE. / RESET, 0 CLA CLL /CLEAR AC AND LINK TAD [400 /CHANGE DIRECTION DTXA JMS DIREC /FIND DIRECTION TAD [6 /FORWARD MAKE +3 TAD [-3 /REVERSE MAKE -3 TAD CURBLK SPA /MAKE SURE VALUE IS PLUS JMP RESEV JMS I [SEARCH /FIND THIS BLOCK SKP CLA /FOUND IT JMP RESET+4 REEXT, DTRA AND [200 /CLEAR STOP-GO FLAG TAD [400 /AND REVERSE DIRECTION DTXA JMP I RESET RESEV, JMS BACKUP /REWIND THIS TAPE JMP REEXT / / / THIS BRANCH IS TKEN WHEN / ALL COPYING IS COMPLETED DONE, JMS I [SPEAK MESS4 JMS I [SMIGIT JMP I [BEGIN JMP I [BEGIN /THIS SUBROUTINE READS NUMBERS, /NOT EXCEEDING 4098, FROM A TELETYPE /AND RETURNS THE OCTAL VALUE OF INPUT. /THE FOLLOWING SPECIAL CHARACTERS /ARE USD...<RETURN> MARKS END OF INPUT, CAUSES A <CR><LF> /IF THE <RETURN> IS THE FIRST CHARACTER THEN /DIRECT RETURN IS TAKEN, ELSE RETURN IS TO ENTRY+2 / <^C> CAUSES A BRANCH TO 7600 / SMIGIT, 0 KCC /INITIALIZE TTY INPUT DCA SMISUM /CLEAR TEMP STORAGE JMS TTYIN /GET CHAR AND [177 TAD [200 TAD [-215 /CHECK FOR <RETURN> SNA JMP SMIXIT /EXIT ON FIRST <RETURN> ISZ SMIGIT /ADVANCE EXIT POINTER SMIGOP, TAD [12 /CHECK FOR ^C SNA JMP I [7600 /BRANCH TO MONITOR TAD [-65 /CHECK FOR DIGITS CLL TAD [10 SNL JMP SMILOP /INVALID CHARACTER DCA SMICAR /TEMP STOR TAD SMISUM /GET CHARACTER STRING CLL RAL CLL RAL CLL RAL /ROTATE TO LH POSITION TAD SMICAR /APPEND CURRENT DIGIT DCA SMISUM TAD SMICAR TAD [260 /MAKE ASCII JMS TYPE /ECHO CHARACTER SMILOP, JMS TTYIN /GET NEXT CHARACTER TAD [-215 /CHECK FOR <RETURN> SZA JMP SMIGOP /CONTINUE LOOP SMIXIT, JMS I [SPEAK /SEND A <RETURN><LINE FEED> MESS0+11 TAD SMISUM /GET INPUT STRING JMP I SMIGIT /EXIT /THIS SUBROUTINE READS A CHARACTER FROM THE TTY TTYIN, 0 KSF /WAIT UNTIL READY JMP .-1 KRB /READ TTY BUFFER JMP I TTYIN /THIS SUBROUTINE TYPES OUT A /DIGIT STRING FROM THE AC /AS FOUR OCTAL CHARACTERS TYPNUM, 0 DCA SMICAR /PRESERVE STRING VALUE TAD [-4 DCA SMISUM /INITIALIZE COUNTER TYPXL, TAD SMICAR RTL RAL /GET NEXT PRINT DIGIT DCA SMICAR /RETURN TO STRING TAD [3 AND SMICAR RAL /ENTER CURRENT DIGIT TAD [260 /MAKE ASCII JMS TYPE /TYPE DIGIT ISZ SMISUM /COUNT DIGITS JMP TYPXL /COUNTINUE LOOP JMP I TYPNUM /EXIT /THIS SUBROUTINE TYPES OUT A /MESSAGE IN "TEXT" FORMAT TWO /ASCII CHARACTERS PER WORD. /SPECIAL CHARACTERS ARE NOT /PERMITTED. A CARRIGE RETURN /AND LINE FEED PRECEED THE /MESSAGE. / JMS I [SPEAK <BRANCH TO SUBROUTINE> / MESSAGE <POINTER TO MESSAGE BUFFER> /A ZERO WORD MARKS THE /END OF THE MESSAGE. / SPEAK, 0 CLA CLL TAD [215 JMS I [TYPE /CARRIGE RETURN TAD I SPEAK /GET ADDRESS OF OUTPUT DCA SPELIN ISZ SPEAK TAD [212 JMS I [TYPE /LINE FEED SPEELH, TAD I SPELIN /GET NEXT WORD SNA /CHECK FOR ZERO JMP I SPEAK /EXIT IF ZERO AND [7700 /GET LH CHARACTER CLL RTR /MOVE TO RTR /RIGHT HAND RTR /SIX BITS JMS SPEOUT /TRANSLATE AND OUTPUT TAD I SPELIN ISZ SPELIN /ADVANCE POINTER AND [77 /GET RH CHARACTER JMS SPEOUT /TRANSLATE AND OUTPUT JMP SPEELH SPEOUT, 0 TAD [-40 /CHECK FORMAT SMA TAD [-100 /KLUDGE DIGITS FORMAT<200+XX> TAD [340 /ALPHA FORMAT <300+XX> JMS I [TYPE /OUTPUT IT JMP I SPEOUT /RETURN / /THIS SUBROUTINE TYPES OUT /THE ASCII CHARACTER IN THE AC. / TYPE, 0 TSF /WAIT UNTIL READY JMP .-1 TLS /TYPE CHARACTER CLA JMP I TYPE / /THIS SUBROUTINE TYPES OUT THE /CURRENT UNIT NUMBER TUNIT, 0 CLA DTRA AND [7000 /GET CURRENT UNIT NUMBER CLL RTL /MOVE OVER RTL TAD [260 /MAKE ASCII CODE JMS I [TYPE /TYPE IT JMS I [SMIGIT /WAIT JMP I TUNIT /EXIT JMP I TUNIT / / PAGE /THIS SUBROUTINE SEARCHES DECTAPE /IN A FORWARD OR REVERSE DIRECTION. /STATUS REGISTER A SHOULD CONTAIN /UNIT SELECT NUMBER (0-2), FORWARD /OR REVERSE, AND A5=1. /THE BLOCK NUMBER FOR WHICH THE PROGRAM IS /SEARCHING MUST BE IN THE AC. /ON ERROR RETURN THE COMAND /FOLLOWING THE "JMS" IS SKIPPED, /AN END OF TAPE ERROR WILL CAUSE /THREE MOVES INTO ENDZONE AND TWO COMMANDS FOLLOWING /THE "JMS" ARE SKIPPED SEARCH, 0 CIA /FORM TWO'S COMPLEMENT DCA SEAZOK /STORE - BLOCK NUMBER DCA SEAZIK /CLEAR INPUT WORD DTRA AND [274 DTXA /CLEAR OUT A REGISTER TAD [210 /START DEVICE DTXA JMS DIREC /DETERMINE DIRECTION TAD [NOP-CIA /FORWARD...FIX TO "NOP" TAD [CIA /REVERSE...FIX TO "CIA" DCA SEATIX /FIX UP COMMAND TAD [SEAZIK /BLOCK NUMBER INPUT DCA I [CA /PUT IN CURRENT ADDRESS CLA CMA /NUMBER OF BLOCKS=1 JMS SEARUN /FIND FIRST BLOCK MARK TAD [100 /SET CONTINUOUS MODE FLAG DTXA TAD SEAZIK /BLOCK NUMBER HERE TAD SEAZOK /MINUS BLOCK NUMBER THERE SEATIX, NOP /IFSEARCHING IN REVERSE DIRECTION *.-1 CIA /IF SEARCHING IN FORWARD DIRECTION SPA /SKIP IF DONE JMS SEARUN /FIND "N" BLOCK MARKS DTRA AND [100 /CLEAR CONTINUOUS MODE FLAG DTXA JMP I SEARCH /NORMAL EXIT SEARUN, 0 DCA I [WC /NUMBER OF BLOCKS TO READ DTXA DTSF /CHECK FOR DONE JMP .-1 DTRB /READ STATUS REGISTER B SMA CLA JMP I SEARUN /DT FLAG...NORMAL EXIT JMS I [ERROR /HANDLE ALL ERRORS ISZ SEARCH /END OF TAPE ERROR ISZ SEARCH /ALL OTHER ERRORS JMP SEARUN-4 /EXIT /THIS SUBROUTINE READS OR WRITES /<N> WORDS, IN CONTROL MODE, ON /A BLOCK(S) ASSUMING THAT /THE DECTAPE IS PROPERLY /POSITIONED. IN LINE CODE: / JMS I [DECTAP / <BUFFER> ADDRESS TO READ INTO (OR WRITE FROM) -1 / <3> IF READ, <5> IF WRITE /<<NORMAL RETURN>> /<<END OF TAPE ERROR>> /AN END OF TAPE ERROR WHILE SEARCHING /CAUSES A BRANCH TO "REVERT". /STATUS REGISTER A SHOULD CONTAIN: /AO-2 UNIT NUMBER /A3 FORWARD=0, REVERSE=1 /A4 UNIMPORTANT, SHOULD BE ZERO /A5 1 /A6-8,89 UNIMPORTANT /BLOCK NUMBER IN PAGE ZERO "CURBLK" /NUMBER OF WORDS TO READ OR /WRITE IS IN PAGE ZERO "LENGTH" / DECTAP, 0 TAD I DECTAP /GET INPUT BUFFER DCA DECTCA /STORE ISZ DECTAP DECAGN, TAD CURBLK /SEARCH FOR BLOCK JMS I [SEARCH JMP DECRUN /FOUND IT JMP DECAGN JMP I [REVERT /END ZONE ERROR DECRUN, TAD SEAZIK TAD SEAZOK /CHECK TO SEE IF FOUND BLOCK SZA JMP DECEXT-3 TAD LENGTH /SET UP WORD COUNT CIA DCA I [WC TAD DECTCA /AND INPUT OUTPUT BUFFER DCA I [CA TAD I DECTAP /GET READ OR WRITE DECLOP, DTXA /START GOING DTSF JMP .-1 DTRB /GET FLAGS SMA JMP DECEXI JMS I [ERROR JMP DECEXT-1 /ENDZONE ERROR JMS I [RESET /RESTORE POINTERS JMP DECAGN ISZ DECTAP /END OF TAPE EXIT DECEXT, ISZ DECTAP CLA JMP I DECTAP /FINISHED DECEXI, CLA TAD I [WC /HAVE WE FINISHED? SZA CLA JMP DECLOP /NO-:CONTINUE READ-WRITE DTRA /YES--CLEAR STATUS AND [274 DTXA JMP DECEXT /THIS SUBROUTINE CHECKS THE CONTENTS /OF STATUS REGISTER B. / <BRANCH> JMS I [ERROR / <+1 END OF TAPE ERROR> / <+2 ALL OTHER ERRORS> /IN ADDITION: 1--A SELECT ERROR WILL /CAUSE A TYPEOUT AND HALT. 2--A PARITY /ERROR ON OUTPUT TAPE CAUSES A /BRANCH TO "COPERS"; ON INPUT TAPE /"PARITY ERROR" IS TYPED OUT. 3--GO FLIP-FLOP /AND STATUS REGISTER A6-8 WILL BE CLEARED. / ERROR, 0 CLA CLL DTRB /GET ERROR FLAGS AND [200 /PARITY ERROR FLAG SNA CLA JMP ERNOT /HANDLE OTHER ERRORS DTXA /CLEAR FLAGS, CONTINUE READ MODE DTRA /GET UNIT NUMBER AND [7000 TAD MSKIN /CHECK FOR INPUT UNIT SZA JMP I [COPERR /ERROR ON OUTPUT UNIT TAD I [WC /PUT WORD COUNT IN PUSH CIA DCA I PARDEL /DOWN STACK ISZ PARDEL /ADVANCE POINTER ISZ PARITY /SET FLAG JMP I [DECEXI /RETURN TO READ ERNOT, DTRA /GET STATUS REGISTER A AND [274 TAD [2 /DO NOT DISTURB ERROR FLAGS DTXA /CLEAR A4 AND A6-8 DTRB /GET ERROR FLAGS RTL SMA /SKIP IF END OF TAPE ERROR JMP ERROTH CLA TAD [-3 /LOAD -3 DCA ERRSOR /STORE IN COUNT TAD [200 /GO FLIP-FLOP DTXA /SET DTSF JMP .-1 ISZ ERRSOR /HAVE WE DONE THREE TIMES JMP .-5 JMP I ERROR /EXIT ERRSOR, 0 ERROTH, ISZ ERROR /CHANGE ERROR BRANCH SZL CLA CLL /MARK TRACK ERROR RTL SNL CLA JMP I ERROR /TIMING ERROR BRANCH JMS I [SPEAK /SELECT ERROR MESSAGE ERRSEL ERRUNT, JMS I [TUNIT JMP I ERROR / PAGE / VARIOUS MESSAGES MESS0, TEXT %DECTAPE COPY V10A % MESSA, TEXT %FIRST BLOCK TO COPY (OCTAL) % MESSB, TEXT %FINAL BLOCK TO COPY (OCTAL) % ERRSEL, TEXT %SELECT ERROR ON UNIT #% PMESS, TEXT %PARITY ERROR ON BLOCK % MESSC, TEXT %VERIFY OUTPUT? (0=YES, 1=NO): % MESS1, TEXT %FROM UNIT % MESS2, TEXT %TO UNIT % MESS3, TEXT %PDP-8 WORDS PER BLOCK % MESS4, TEXT %DONE% MESS5, TEXT %WRITE ERRORS ON UNIT #% MESS3A, TEXT %BLOCK LENGTH ERROR% / / PAGE / / /THIS ROUTINE TYPES OUT PARITY ERROR MESSAGES /AND RESTORES POINTERS TO THE PUSH DOWN STACK. ERRPAR, CIA DCA PARITY /SET UP STACK COUNTER CLA CMA TAD PARDEL /MOVE POINTER BACK DCA PARDEL JMS I [SPEAK /TYPE OUT MESSAGE PMESS TAD CURBLK EPLOOP, DCA EPJK TAD I PARDEL /CHECK FOR CORRECT BLOCK NUMBER TAD WORDS /ADVANCE BLOCK WORDS COUNT DCA I PARDEL TAD I PARDEL CIA /REACHED ORIGINAL VALUE? TAD LENGTH SNA CLA JMP EPTYP /TYPE BLOCK AT ERROR JMS DIREC CLL CMA RAL /ADD ONE IF FORWARD CMA /SUBTRACT ONE IF NEGATIVE TAD EPJK /NEXT BLOCK NUMBER JMP EPLOOP /CONTINUE LOOP EPTYP, TAD EPJK JMS I [TYPNUM /TYPE BLOCK NUMBER ISZ PARITY /ADVANCE COUNTER JMP ERRPAR+2 /CONTINUE LOOP JMP I EPPEXT /RETURN TO COPY EPPEXT, COPZ /REENTRY TO COPY EPJK, 0 /WORKING STORAGE /THIS SUBROUTINE READS A RANDOM /BLOCK ON DECTAPE TO DETERMINE THE BLOCK LENGTH FIXTAP, 0 TAD [610 /FIX A REG. WORD DTCA DTXA /LOAD A STAT. REG. CLA CMA DCA I [WC /SEARCH FOR 1 BLOCK TAD [BUFIOT /FIX CURRENT ADDRESS DCA I [CA /TO READ INTO BUFFER DTSF /WAIT AROUND JMP .-1 DTRB SPA CLA JMP FIXERR /HANDLE ERROR CONDITIONS TAD [30 /CHANGE TO READ MODE DTXA DTSF /WAIT TILL READ DONE JMP .-1 TAD [200 /STOP TAPE DTXA TAD I [WC /GET BLOCK LENGTH JMP I FIXTAP /EXIT FIXERR, JMS I [ERROR TAD [400 /END OF TAPE...REVERSE DIRECTION TAD [210 /START TAPE MOVING DTXA /AND CLEAR FLAGS JMP FIXTAP+3 /TRY AGAIN /PARITY ERROR WORD COUNT STACK PSTACK, 0 / /END OF PROGRAM $