Source Code

These source-code files are part of a reconstructed copy of Artemis 071, the first release of the Apollo 15 through 17 Command Module (CM) Apollo Guidance Computer (AGC) software.

The reconstruction began with source code of Artemis 072 previously transcribed from a digitized copy of that program. The code was then updated by undoing changes between the two versions. The reconstruction was verified by matching memory-bank checksums to those listed in drawing 2021154-. Note that page numbers in the reconstructed code match those on the Artemis 072 printout, although the changed code would likely have changed page numbers for a real Artemis 071 listing.

Comments from the original source code are prefixed with a single '#' symbol, whereas comments added later are prefixed by "##" or "###". Report any errors noted by creating an issue report at the Virtual AGC project's GitHub repository.

018773,000002:                                                                                                  ## Copyright:   Public domain.
018774,000003:                                                                                                  ## Filename:    SYSTEM_TEST_STANDARD_LEAD_INS.agc
018775,000004:                                                                                                  ## Purpose:     A section of Artemis revision 071.
018776,000005:                                                                                                  ##              It is part of the reconstructed source code for the first
018777,000006:                                                                                                  ##              release of the flight software for the Command Module's
018778,000007:                                                                                                  ##              (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
018779,000008:                                                                                                  ##              17. The code has been recreated from a copy of Artemis 072.
018780,000009:                                                                                                  ##              It has been adapted such that the resulting bugger words
018781,000010:                                                                                                  ##              exactly match those specified for Artemis 071 in NASA
018782,000011:                                                                                                  ##              drawing 2021154-, which gives relatively high confidence
018783,000012:                                                                                                  ##              that the reconstruction is correct.
018784,000013:                                                                                                  ## Reference:   424
018785,000014:                                                                                                  ## Assembler:   yaYUL
018786,000015:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
018787,000016:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
018788,000017:                                                                                                  ## Mod history: 2019-08-14 MAS  Created from Artemis 072.
018789,000018: 

Page 424

018791,000020: 
018792,000021: 22,3172  E5,1671                                  EBANK=   XSM                                   
018793,000022: 
018794,000023: 13,2000                                           SETLOC   E/PROG1                               
018795,000024: 13,2000                                           BANK                                           
018796,000025: 
018797,000026: 13,2036                                           COUNT*   $$/P07                                
018798,000027: 
018799,000028:                                                                                                  #  SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
018800,000029: 
018801,000030:                                                                                                  #  E/BKCALL      FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
018802,000031: 
018803,000032:                                                                                                  #  THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED.  LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
018804,000033:                                                                                                  #  IS NOT POSSIBLE.
018805,000034: 
018806,000035:                                                                                                  #  THE CALLING SEQUENCE IS:
018807,000036: 
018808,000037:                                                                                                  #                TC      BANKCALL
018809,000038:                                                                                                  #                CADR    E/BKCALL
018810,000039:                                                                                                  #                CADR    ROUTINE         WHERE YOU WANT TO GO IN FIXED.
018811,000040:                                                                                                  #                RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
018812,000041:                                                                                                  #                RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
018813,000042:                                                                                                  #                RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
018814,000043: 
018815,000044:                                                                                                  #  THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
018816,000045:                                                                                                  #  OTHER EMEMORY PROGRAMS.
018817,000046: 
018818,000047:                                                                                                  #  A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
018819,000048: 
018820,000049: 13,2036           52134        E/BKCALL           DXCH     BUF2                                  #  SAVE A,L AND GET DP RETURN.
018821,000050: 13,2037           53115                           DXCH     EBUF2                                 #  SAVE DP RETURN.
018822,000051: 13,2040           25114                           INCR     EBUF2                                 #  RETURN +1 BECAUSE DOUBLE CADR.
018823,000052: 13,2041           30006                           CA       BBANK                                 
018824,000053: 13,2042           75041                           MASK     LOW10                                 #  GET CURRENT EBANK.  (SBANK SOMEDAY)
018825,000054: 13,2043           27115                           ADS      EBUF2      +1                         #  FORM BBCON.  (WAS FBANK)
018826,000055: 13,2044           51114                           NDX      EBUF2                                 
018827,000056: 13,2045           27777                           CA       0          -1                         #  GET CADR OF ROUTINE.
018828,000057: 13,2046           04642                           TC       SWCALL                                #  GO TO ROUTINE, SETTING Q TO SWRETURN
018829,000058:                                                                                                  #  AND RESTORING A + L.
018830,000059: 13,2047           02053                           TC       +4                                    #  TX Q, V34, OR BAD STALL RETURN.
018831,000060: 13,2050           02052                           TC       +2                                    #  PROCEED OR GOOD STALL RETURN.
018832,000061: 13,2051           25114                           INCR     EBUF2                                 #  ENTER OR RECYCLE RETURN.
018833,000062: 13,2052           25114                           INCR     EBUF2                                 
018834,000063: 13,2053           53115        E/SWITCH           DXCH     EBUF2                                 
018835,000064: 13,2054           52006                           DTCB                                           
018836,000065: 

Page 425

018838,000067:                                                                                                  #  E/CALL        FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
018839,000068: 
018840,000069:                                                                                                  #  THE CALLING SEQUENCE IS...
018841,000070: 
018842,000071:                                                                                                  #                RTB
018843,000072:                                                                                                  #                        E/CALL
018844,000073:                                                                                                  #                CADR    ROUTINE         THE INTERPRETIVE SUBROUTINE YOU WANT.
018845,000074:                                                                                                  #                                        RETURNS HERE IN INTERPRETIVE.
018846,000075: 
018847,000076: 13,2055           22164        E/CALL             LXCH     LOC                                   #  ADRES -1 OF CADR.
018848,000077: 13,2056           50001                           INDEX    L                                     
018849,000078: 13,2057           30001                           CA       L                                     #  CADR IN A.
018850,000079: 13,2060           24001                           INCR     L                                     
018851,000080: 13,2061           24001                           INCR     L                                     #  RETURN ADRES IN L.
018852,000081: 13,2062           53115                           DXCH     EBUF2                                 #  STORE CADR AND RETURN.
018853,000082: 13,2063           06006                           TC       INTPRET                               
018854,000083: 13,2064           77624                           CALL                                           
018855,000084: 13,2065           01114                                    EBUF2                                 #  INDIRECTLY EXECUTE ROUTINE.  IT MUST
018856,000085: 13,2066           77776                           EXIT                                           #  LEAVE VIA RVQ OR EQUIVALENT.
018857,000086: 13,2067           23115                           LXCH     EBUF2      +1                         #  PICK UP RETURN.
018858,000087: 13,2070           16010                           TCF      INTPRET    +2                         #  SET LOC AND RETURB TO CALLER
018859,000088: 

Page 426

018861,000090:                                                                                                  #  E/JOBWAK      FOR WAKING UP ERASABLE MEMORY JOBS.
018862,000091: 
018863,000092:                                                                                                  #  THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
018864,000093: 
018865,000094:                                                                                                  #  THE CALLING SEQUENCE IS:
018866,000095: 
018867,000096:                                                                                                  #                INHINT
018868,000097:                                                                                                  #                  .
018869,000098:                                                                                                  #                  .
018870,000099:                                                                                                  #                CA      WAKEADR         ADDRESS OF SLEEPING JOB
018871,000100:                                                                                                  #                TC      IBNKCALL
018872,000101:                                                                                                  #                CADR    E/JOBWAK
018873,000102:                                                                                                  #                  .                     RETURNS HERE
018874,000103:                                                                                                  #                  .
018875,000104:                                                                                                  #                  .
018876,000105:                                                                                                  #                RELINT                  IF YOU DID AN INHINT.
018877,000106: 
018878,000107: 12,2000                                           SETLOC   E/PROG                                
018879,000108: 12,2000                                           BANK                                           
018880,000109: 
018881,000110: 12,2000                                           COUNT*   $$/P07                                
018882,000111: 
018883,000112: 12,2000           05167        E/JOBWAK           TC       JOBWAKE                               #  ARRIVE IWTH ADRES IN A.
018884,000113: 12,2001           44756                           CS       BIT11                                 
018885,000114: 12,2002           50064                           NDX      LOCCTR                                
018886,000115: 12,2003           26164                           ADS      LOC                                   #  KNOCK FIXED MEMORY BIT OUT OF ADRES.
018887,000116: 12,2004           00072                           TC       RUPTREG3                              #  RETURN
018888,000117: 
018889,000118: 
018890,000119:                                                                                                  #  THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
018891,000120:                                                                                                  #  PRELAUNCH ALIGN.  THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
018892,000121: 
018893,000122: 
018894,000123: 33,2000                                           SETLOC   TESTLEAD                              
018895,000124: 33,2000                                           BANK                                           
018896,000125: 
018897,000126: 33,2000                                           COUNT*   $$/COMST                              
018898,000127: 33,2000  E5,1425                                  EBANK=   QPLACE                                
018899,000128: 
018900,000129: 33,2000           03212        COMPVER            TC       GCOMPVER                              #  MUST BE 33,2000.
018901,000130: 
018902,000131: 33,2001           02703        GTSCPSS1           TC       GTSCPSS                               #  MUST BE AT 33,2001

End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc.  Parent file is MAIN.agc