Apollo-11/Comanche055/SXTMARK.agc

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# Copyright: Public domain.
# Filename: SXTMARK.agc
# Purpose: Part of the source code for Comanche, build 055. It
# is part of the source code for the Command Module's
# (CM) Apollo Guidance Computer (AGC), Apollo 11.
# Assembler: yaYUL
# Reference: pp. 222-235
# Contact: Ron Burkey <info@sandroid.org>,
# Fabrizio Bernardini <fabrizio@spacecraft.it>
# Website: http://www.ibiblio.org/apollo.
# Mod history: 16/05/09 FB Transcription Batch 2 Assignment.
#
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# The contents of the "Comanche055" files, in general, are transcribed
# from scanned documents.
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#
# Assemble revision 055 of AGC program Comanche by NASA
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# 2021113-051. April 1, 1969.
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#
# This AGC program shall also be referred to as Colossus 2A
#
# Prepared by
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# Massachusetts Institute of Technology
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# 75 Cambridge Parkway
# Cambridge, Massachusetts
#
# under NASA contract NAS 9-4065.
#
# Refer directly to the online document mentioned above for further
# information. Please report any errors to info@sandroid.org.
# Page 222
# PROGRAM NAME - SXTMARK DATE- 5 APRIL 1967
# PROGRAM MODIFIED BY 258/278 PROGRAMMERS LOG SECTION SXTMARK
# MOD BY- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 116
# FUNCTIONAL DESCRIPTION-
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# SXTMARK IS CALLED FROM INTERNAL ROUTINES WHICH MAY REQUIRE STAR OR LANDMARK MARKINGS BY THE ASTRONAUT. IF
# THE MARK SYSTEM IS NOT IN USE, SXTMARK RESERVES A VAC AREA FOR MARKING AND REQUESTS EXECUTION OF THE MKVB51
# ROUTINE VIA THE EXECUTIVE JOB PRIORITY LIST. R21 USES THIS ROUTINE TO DETERMINE IF THE MARK SYSTEM CAN BE
# USED. IF YES, SXTMARK RETURNS TO R21 TO PERFORM ITS OWN MARK REQUESTS VIA THE V51 FLASH.
# CALLING SEQUENCE-
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# CAF (NO. MARK REQUESTS IN BITS 1-3 OF A)
# TC BANKCALL
# CADR SXTMARK
# NORMAL EXIT MODE-
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# SWRETURN
# ALARM OR ABORT EXIT MODE-
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# ABORT
# OUTPUT-
# 1) MARKSTAT CONTAINS MARK VALUE (BITS 14-12) AND VAC AREA ADDRESS
# 2) QPRET = VAC AREA POINTER VALUE
# 3) 1ST WORD OF RESERVED VAC AREA SET TO +0
# 4) PRIO32 PLACED IN A REGISTER
# ERASABLE INITIALIZATION-
# 1) BITS 1-3 OF A = NO. MARKS REQUESTED
# 2) BITS 2,3 OF EXTVBACT =0
# 3) A VAC AREA MUST BE AVAILABLE (WORD 1 = ADDRESS OF VAC AREA)
# DEBRIS-
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# A,Q,L,RUPTREG1,MARKSTAT,QPRET,BIT2 OF EXTVBACT
BANK 13
SETLOC SXTMARKE
BANK
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EBANK= MRKBUF1
COUNT 07/SXTMK
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SXTMARK INHINT
TS RUPTREG1 # NUMBER OF MARKS WANTED
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CAF SIX # BIT2 = MARKING SYSTEM IN USE
MASK EXTVBACT # BIT3 = EXTENDED VERB IN PROGRESS
CCS A
TC MKABORT # SET THEREFORE ABORT
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# Page 223
CAF BIT2 # NOT SET
ADS EXTVBACT # SET IT, RESET IN ENDMARK
TC MARKOK # YES, FIND VAC AREA
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MKABORT TC BAILOUT
OCT 01211
MARKOK CCS VAC1USE # FIND VAC AREA
TC MKVACFND
CCS VAC2USE
TC MKVACFND
CCS VAC3USE
TC MKVACFND
CCS VAC4USE
TC MKVACFND
CCS VAC5USE
TC MKVACFND
TC BAILOUT
OCT 01207
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MKVACFND AD TWO # ADDRESS OF VAC AREA
TS MARKSTAT
INDEX A
TS QPRET # STORE NEXT AVAILABLE MARK SLOT
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CAF ZERO # STORE VAC AREA OCCUPIED
INDEX MARKSTAT
TS 0 -1
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TC CHECKMM # BACKUP MARK ROUTINE USES SXTMARK
MM 53
TCF +2
TCF SWRETURN
TC CHECKMM
MM 54
TCF +2
TCF SWRETURN
CAF BIT12 # DESIRED NUMBER OF MARKS IN 12-14
EXTEND
MP RUPTREG1
XCH L
ADS MARKSTAT
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CAF PRIO32 # ENTER MARK JOB
TC NOVAC
EBANK= MARKSTAT
2CADR MKVB51
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RELINT
TCF SWRETURN # SAME AS MODEEXIT
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# Page 224
# PROGRAM NAME - MKRELEAS DATE- 5 APRIL 1967
# PROGRAM MODIFIED BY 248/278 PROGRAMMERS LOG SECTION SXTMARK
# MOD BY- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 116
# FUNCTIONAL DESCRIPTION-
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# MKRELEAS IS EXECUTED BY INTERNAL ROUTINES TO RELEASE THE MARK SYSTEM TO MAKE IT AVAILABLE TO OTHER INTERNAL
# SYSTEM ROUTINES. IT ALSO CLEARS THE COARSE OPTICS FLAG BIT AND DISABLES THE OPTICS ERROR COUNTER.
# CALLING SEQUENCE-
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# TC BANKCALL
# CADR MKRELEAS
# NORMAL EXIT MODE-
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# SWRETURN
# ALARM OR ABORT EXIT MODE- NONE
# OUTPUT-
# 1) BIT9 OPTMODES SET TO 0
# 2) OPTIND SET TO -1
# 3) 1ST WORD OF VAC AREA SET TO VAC ADDRESS TO SIGNIFY AVAILABILITY.
# 4) MARKSTAT CLEARED
# 5) BIT2 CHANNEL 12 SET TO 0
# ERASABLE INITIALIZATION- NONE
# DEBRIS-
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# A,MARKSTAT,BIT9,OPTMODES OPTIND,BIT2 CHANNEL 12
MKRELEAS CAF ZERO # SHOW MARK SYSTEM NOW AVAILABLE
XCH MARKSTAT
MASK LOW9
CCS A
INDEX A
TS 0
MKRLEES INHINT
CS BIT9 # COARSE OPTICS RETURN FLAG.
MASK OPTMODES
TS OPTMODES
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CA NEGONE
TS OPTIND # KILL COARSE OPTICS
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CS BIT2 # DISABLE OPTICS ERROR COUNTER
EXTEND
WAND CHAN12
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RELINT
TC SWRETURN
# Page 225
# PROGRAM NAME - MARKRUPT DATE- 5 APRIL 1967
# PROGRAM MODIFIED BY 258/278 PROGRAMMERS LOG SECTION SXTMARK
# MOD BY- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 116
# FUNCTIONAL DESCRIPTION-
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# MARKRUPT STORES CDUS,OPTICS AND TIME AND TRANSFERS CONTROL TO THE MARKIT,MARK REJECT OR KEYCOM ROUTINES IF
# BITS IN CHANNEL 16 ARE SET AS REQUIRED.
# CALLING SEQUENCE-
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# ROUTINE ENTERED VIA KEYRUPT2 WHEN MARK,MARK REJECT OR DSKY KEYS DEPRESSED BY THE OPERATOR.
# NORMAL EXIT MODE-
# MARKIT, MKREJECT, OR POSTJUMP ROUTINES (MARK,MARK REJECT, OR DSKY CODE)
# ALARM OR ABORT EXIT MODE-
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# ALARM AND RESUME
# OUTPUT-
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# RUPTSTOR+5 = CDUT, RUPTSTOR+3 = CDUS, RUPTSTOR+2 = CDUY,
# RUPTREG3 = CDUZ, RUPTSTOR+6 = CDUX, RUPTSTOR+1 AND SAMPTIME+1 =TIME1,
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# RUPTSTOR AND SAMPTIME = TIME2
# ERASABLE INITIALIZATION-
# CDUT,CDUS,CDUY,CDUZ,CDUX,TIME2,TIME1,CHANNEL 16 BITS 6,7 OR 1-5
# DEBRIS-
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# A,QRUPT,RUPTREG3,SAMPTIME,SAMPTIME+1,RUPTSTOR TO RUPTSTOR+6 EXCEPT RUPTSTOR+4 (LOCATION 67)
MARKRUPT TS BANKRUPT # STORE CDUS AND OPTICS NOW
CA CDUT
TS MKCDUT
CA CDUS
TS MKCDUS
CA CDUY
TS MKCDUY
CA CDUZ
TS MKCDUZ
CA CDUX
TS MKCDUX
EXTEND
DCA TIME2 # GET TIME
DXCH MKT2T1
EXTEND
DCA MKT2T1
DXCH SAMPTIME # RUPT TIME FOR NOUN 65.
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XCH Q
TS QRUPT
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CAF BIT6 # SEE IF MARK OR MKREJECT
# Page 226
EXTEND
RAND NAVKEYIN
CCS A
TC MARKIT # ITS A MARK
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CAF BIT7 # NOT A MARK, SEE IF MKREJECT
EXTEND
RAND NAVKEYIN
CCS A
TC MKREJECT # ITS A MARK REJECT
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KEYCALL CAF OCT37 # NOT MARK OR MKREJECT, SEE IF KEYCODE
EXTEND
RAND NAVKEYIN
EXTEND
BZF +3 # IF NO INBITS
TC POSTJUMP
CADR KEYCOM # IT,S A KEY CODE, NOT A MARK.
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+3 TC ALARM # ALARM IF NO INBITS
OCT 113
TC RESUME
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# Page 227
# PROGRAM NAME - MARKCONT DATE- 19 SEPT 1967
# PROGRAM MODIFIED BY 258/278 PROGRAMMERS LOG SECTION SXTMARK
# MOD BY- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 116
# FUNCTIONAL DESCRIPTION-
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# MARKCONT IS USED TO PERFORM A SPECIAL MARK FUNCTION FOR R21, TO EXECUTE A SPECIAL DISPLAY OF OPTICS AND TIME OR
# TO PERFORM A MARK OF THE STAR OR LAND SIGHTING BASED UPON FLASHING V-N.
# CALLING SEQUENCE-
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# FROM MARKDIF
# NORMAL EXIT MODE-
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# TASKOVER
# ALARM OR ABORT EXIT MODE-
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# ALARM AND TASKOVER
# OUTPUT-
# 1) FOR R21-
# EBANK=EBANK7
# MRKBUF1 TO MRKBUF1+6 = TIME2,TIME1,CDUY,OPTICX,CDUZ,OPTICSY,CDUX OF CURRENT R21 MARK FUNCTION.
# MRKBUF2 TO MRKBUF2+6 CONTAINS PREVIOUS R21 MARK VALUES.
# 2) FOR SPECIAL DISPLAY JOB-
# RUPTREG1 AND MRKBUF1 = CDUS,RUPTREG2 AND MRKBUF1 +1 = CDUT.
# RUPTREG3 AND MRKBUF1 +2 = TIME2,RUPTREG4 AND MRKBUF1 +3 = TIME1
# 3) FOR NORMAL MARKING-
# DECREMENT BITS14-12 OF MARKSTAT BY 1,
# BIT10 MARKSTAT SET TO 1,INCREMENT QPRET BY 7,
# STORE TIME2,TIME1,CDUY,CDUS,CDUZ,CDUT AND CDUX IN VAC+1 TO VAC+7
# ERASABLE INITIALIZATION-
# 1) FOR R21-
# BIT14 OF STATE+2 =1, MRKBUF1 TO MRKBUF1+6, ITEMP1, RUPTREG3,
# RUPTSTOR TO RUPTSTOR+6 EXCEPT RUPTSTOR+4
# 2) FOR SPECIAL DISPLAY JOB-
# BIT14 OF STATE+2 =0,MARKSTAT =+0,RUPTREG1,RUPTREG2,RUPTREG3
# RUPTREG4,RUPTSTOR,RUPTSTOR+1,RUPTSTOR+3,RUPTSTOR+5,
# BIT12 OF STATE+5 (V59 FLAG),MRKBUF1 THRU MRKBUF1+3
# 3) FOR NORMAL MARKING-
# BIT14 OF STATE+2 =0,MARKSTAE =VAC ADDRESS, A REG, ITEMP1, RUPTREG3,
# RUPTSTOR TO RUPTSTOR+6 EXCEPT RUPTSTOR+4.
# DEBRIS-
# 1) FOR R21-
# A,ITEMP1,MRKBUF1,MRKBUF2
# 2) FOR SPECIAL DISPLAY JOB-
# A,RUPTREG1,RUPTREG2,RUPTREG3,RUPTREG4,MPAC TO MPAC+3
# 3) FOR NORMAL MARKING-
# A,MARKSTAT,ITEMP1,QPRET,VAC+1 TO VAC+7 OF VAC AREA IN USE
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# Page 228
MARKCONT CAF BIT14
MASK STATE +2 # R21 MARK (SPECIAL MARKING FOR R21)
EXTEND
BZF MARKET # NOT SET THEREFORE REGULAR MARKING
MARKIT1 CAF SIX # SPECIAL FOR R21
TC GENTRAN # TRANSFER MRKBUF1 TO MRKBUF2
ADRES MRKBUF1
ADRES MRKBUF2
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CAF SIX # TRANSFER CURRENT MARK DATA TO MARKBUF1
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TC GENTRAN
ADRES MKT2T1
ADRES MRKBUF1
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TCF TASKOVER
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MARKET CCS MARKSTAT # SEE IF MARKS CALLED FOR
TC MARK2 # COLLECT MARKS
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CAF TWO # IS MARKING SYSTEM IN USE (BIT2)
MASK EXTVBACT
EXTEND
BZF MARKET3 # MARKING NOT CALLED FOR
CAF BIT12
MASK STATE +5 # V59FLAG
EXTEND
BZF MARKET3 # IF V59FLAG NOT SET-MARK UNCALLED FOR
CAF PRIO5 # CALIBRATION MARK (SET) FOR P23
TC NOVAC # SPECIAL DISPLAY JOB
EBANK= MRKBUF1
2CADR MARKDISP
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CAF SIX
TC GENTRAN # TRANSFER MARK DATE TO MARKDOWN
ADRES MKT2T1
ADRES MARKDOWN
CAF SIX
TC GENTRAN # TRANSFER MARK DATA TO MRKBUF1 FOR
ADRES MKT2T1 # SPECIAL DISPLAY OF SHAFT AND TRUNNION
ADRES MRKBUF1 # IF V59 ACTING
TCF TASKOVER
MARKET3 TC ALARM
OCT 122 # MARKING NOT CALLED FOR
TCF TASKOVER
114ALM TC ALARM # MARK NOT WANTED
OCT 114
TCF TASKOVER
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# Page 229
# STORE MARK DATA IN MKVAC AND INCREMENT POINTER
MARK2 AD 74K # SEE IF MARKS WANTED-REDUCE MARKS WANTED
EXTEND
BZMF 114ALM # MARK NOT WANTED-ALARM
TS MARKSTAT
COM
MASK BIT10 # SET BIT10 TO ENABLE REJECT
ADS MARKSTAT
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MASK LOW9
TS ITEMP1
INDEX A
XCH QPRET # PICK UP MARK SLOT-POINTER
TS ITEMP2 # SAVE CURRENT POINTER
AD SEVEN # INCREMENT POINTER
INDEX ITEMP1
TS QPRET # STORE ADVANCED POINTER
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VACSTOR EXTEND
DCA MKT2T1
INDEX ITEMP2
DXCH 0
CA MKCDUY
INDEX ITEMP2
TS 2
CA MKCDUS
INDEX ITEMP2
TS 3
CA MKCDUZ
INDEX ITEMP2
TS 4
CA MKCDUT
INDEX ITEMP2
TS 5
CA MKCDUX
INDEX ITEMP2
TS 6
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CAF PRIO34 # IF ALL MARKS MADE FLASH VB50
MASK MARKSTAT
EXTEND
BZF +2
TCF TASKOVER
CAF PRIO32
TC NOVAC
EBANK= MARKSTAT
2CADR MKVB50
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TCF TASKOVER
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# Page 230
# PROGRAM NAME - MKREJECT DATE- 5 APRIL 1967
# PROGRAM MODIFIED BY 258/276 PROGRAMMERS LOG SECTION SXTMARK
# MOD BY- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 116
# FUNCTIONAL DESCRIPTION-
# ROUTINE ALLOWS OPEATOR TO REJECT MARK MADE PRIOR TO ACCEPTANCE AND ALLOWS A NEW MARK TO BE MADE BY ASTRONAUT
# CALLING SEQUENCE-
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# FROM MARKRUPT IF BIT7 OF CHANNEL 16 IS 1.
# NORMAL EXIT MODE-
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# RESUME
# ALARM OR ABORT EXIT MODE-
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# ALARM AND RESUME
# OUTPUT-
# 1) FOR R21-
# MRKRUP1 SET TO -1
# 2) FOR NORMAL MARKING-
# BIT10 MARKSTAT =0,INCREMENT NO. MARKS BY 1,DECREMENT QPRET BY 7
# ERASABLE INITIALIZATION-
# 1) FOR R21-
# BIT14 OF STATE+2 SET TO 1
# 2) FOR NORMAL MARKING-
# BIT14 OF STATE+2 SET TO 0, MARKSTAT,QPRET
# DEBRIS-
# 1) FOR R21-
# A,MARKSTAT,EBANK
# 2) FOR NORMAL MARKING-
# A,MARKSTAT,ITEMP1,QPRET
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MKREJECT CAF BIT14
MASK STATE +2 # R21 MARK (SPECIAL MARKING FOR R21)
EXTEND
BZF MRKREJCT # NOT SET THEREFORE REGULAR REJECT
CA NEGONE # -1 (FOR R22)
TS MRKBUF1 # -0 IN TIME IS FLAG TO R22 SIGNIFYING A
TC RESUME # REJECTED MARK
MRKREJCT CCS MARKSTAT # SEE IF MARKS BEING ACCEPTED
TC REJECT2
TC ALARM # MARKS NOT BEING ACCEPTED
OCT 112
TC RESUME
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REJECT2 CS BIT10 # SEE IF MARK HAD BEEN MADE SINCE LAST
MASK MARKSTAT # REJECT, AND SET BIT10 TO ZERO TO
XCH MARKSTAT # SHOW MARK REJECT
# Page 231
MASK BIT10
CCS A
TC REJECT3
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TC ALARM # DONT ACCEPT TWO REJECTS TOGETHER
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OCT 110
TC RESUME
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REJECT3 CAF LOW9 # DECREMENT POINTER TO REJECT MARK
MASK MARKSTAT
TS ITEMP1
CS SEVEN
INDEX ITEMP1
ADS QPRET # NEW POINTER
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CAF BIT12 # INCREMENT MARKS WANTED AND IF FIELD
AD MARKSTAT # IS NOW NON-ZERO, CHANGE TO VB51 TO
XCH MARKSTAT # INDICATE MORE MARKS WANTED
MASK PRIO34 # INDICATE MORE MARKS WANTED
CCS A
TC RESUME
CAF PRIO32
TC NOVAC
EBANK= MARKSTAT
2CADR MKVB51
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TC RESUME
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# Page 232
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# PROGRAM DESCRIPTION MKVB51 AND MKVB50
# AUTHOR-BARNERT DATE-2-15-67 MOD-0
# PURPOSE FLASH V51N70,V51N43, OR V51 TO REQUEST MARKING,
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# AND V50N25 R1=16 TO REQUEST TERMINATE MARKING.
# CALLING SEQUENCE AS JOB WITHIN SXTMARK
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# EXIT TO ENDMARK UPON RECEIPT OF V33, V34 CAUSES GOTOP00H, ENTER
# RECYCLES THE DISPLAY
# NOTE- SXTMARK AUTOMATICALLY CHANGES FROM CALLING MKVB51 TO MKVB50 WHEN
# SUFFICIENT MARKS HAVE BEEN MADE, AND THE REVERSE WHEN A MARK
# REJECT REDUCES THE NUMBER MADE BELOW THAT REQUIRED
# SUBROUTINES CALLED- BANKCALL, GOMARK2,GOODEND,ENDMARK,WAITLIST
# ALARM OR ABORT MODES - NONE
# ERASABLE USED-VERBREG,MARKSTAT,QPRET,DSPTEM1
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# OUTPUT MARKSTAT=VAC ADDRESS
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# QPRET= NO.MARKS
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MKVB51 TC BANKCALL # CLEAR DISPLAY FOR MARK VERB
CADR KLEENEX
CAF VB51 # DISPLAY MARK VB51
TC BANKCALL
CADR GOMARK4
TCF TERMSXT # VB34-TERMINATE
TCF ENTANSWR # V33-PROCEED-MARKING DONE
TCF MKVB5X # ENTER-RECYCLE TO INITIAL MARK DISPLAY
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TERMSXT TC CLEARMRK # CLEAR MARK ACTIVITY.
TC CHECKMM
MM 03
TCF +2
TC TERMP03
TC POSTJUMP
CADR TERM52
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TERMP03 TC UPFLAG
ADRES TRM03FLG
ENTANSWR CAF LOW9 # PUT VAC ADR IN MARKSTAT AND NO. OF
MASK MARKSTAT # MARKS MADE IN QPRET BEFORE LEAVING
TS MARKSTAT # SXTMARK
COM
INDEX MARKSTAT
AD QPRET
# Page 233
EXTEND
BZMF JAMIT # NO MARKS MADE, SHOW IT IN QPRET, R53
EXTEND # WILL PICK IT UP AND RECYCLE
MP BIT12 # THIS PUTS NUMBER MARKS-1 IN A
AD ONE
JAMIT INDEX MARKSTAT # STORE NO OF MARKS MADE
TS QPRET
INHINT # SERVICE OPTSTALL INTERFACE WITH
CAF FIVE
TC WAITLIST
EBANK= MARKSTAT
2CADR ENDMARKS
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TC ENDMARK # KNOCKS DOWN MARKING FLAG + DOES ENDOFJOB
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ENDMARKS CAF ONE
TC IBNKCALL
CADR GOODEND
MKVB5X CAF PRIO34
MASK MARKSTAT # RE-DISPLAY VB51 IF MORE MARKS WANTED
CCS A # AND VB50 IF ALL IN
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TCF MKVB51
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MKVB50 CAF R1D1 # OCT 16
TS DSPTEM1
CAF V50N25
TCF MKVB51 +3
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V50N25 VN 5025
VB51 VN 5100
OCT37 = LOW5
# PROGRAM NAME - MARKIT DATE- 19 SEPT 1967
# CALLING SEQUENCE
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# FROM MARKRUPT IF CHAN 16 BIT 6 = 1
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# EXIT
# RESUME
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# INPUT
# CDUCHKWD. ALSO ALL INITIALIZATION FOR MARKCONT
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# OUTPUT
# MKT2T1,MKCDUX,MKCDUY,MKCDUZ,MKCDUS,MKCDUT
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# ALARM EXIT
# NONE
MARKIT CCS CDUCHKWD
TCF +3 # DELAY OF CDUCHKWD CS IF PNZ
# Page 234
TCF +2
CAF ZERO
AD ONE # 10 MS IF NO CHECK
TC WAITLIST
EBANK= MRKBUF1
2CADR MARKDIF
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TCF RESUME
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SETLOC SXTMARK1
BANK
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COUNT 20/SXTMK
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# PROGRAM NAME - MARKDIF DATE- 19 SEPT 1967
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# CALLING SEQUENCE
# WAITLIST FROM MARKIT
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# EXIT
# TASKOVER TO IBNKCALL TO MARKCONT
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# INPUT
# OUTPUT FROM MARKIT, INPUT TO MARKCONT, CDUCHKWD
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# OUTPUT
# RUPTSTOR - RUPTSTOR+3,RUPTREG3,RUPTSTOR+5 - RUPTSTOR+6
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# ALARM EXIT
# ALARM AND TASKOVER
MARKDIF CA CDUCHKWD # IF DELAY CHECK IS ZERO OR NEG,ACP MARK
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EXTEND
BZMF MKACPT
CS BIT1
TS MKNDX # SET INDEX -1
CA MKCDUX
TC DIFCHK # SEE IF VEHICLE RATE TO MUCH AT MARK
CA MKCDUY
TC DIFCHK
CA MKCDUZ
TC DIFCHK
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MKACPT TC IBNKCALL
CADR MARKCONT # MARK DATA OK, WHAT DO WE DO WITH IT
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DIFCHK INCR MKNDX # INCREMENT INDEX
EXTEND
INDEX MKNDX
# Page 235
MSU CDUX # GET MARK(ICDU) - CURRENT(ICDU)
CCS A
TCF +4
TC Q
TCF +2
TC Q
AD NEG2 # SEE IF DIFFERENCE GREATER THAN 3 BITS
EXTEND
BZMF -3 # NOT GREATER
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TC ALARM # COUPLED WITH PROGRAM ALARM
OCT 00121
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TCF TASKOVER # DO NOT ACCEPT