Source Code

This is the source-code for the Apollo 9 Command Module's Guidance Computer. These files were derived originally from the scan from MIT's Dibner Institute's now-discontinued website titled "History of Recent Science and Technology", which in turn was originally created by Gary Neff, though his high-quality scans were unfortunately reduced in legibility when presented online. The markings on the front of the printout imply that it was the original AGC developer Norm Brodeur's copy. A scan by Ron Burkey has superceded it, made from a more-legible copy from the collection of original AGC developer Fred Martin. The source code was transcribed from those images by Ron Burkey. Note that the page images presented online are of reduced quality, and that higher-quality images are available. Report any conversion errors or legibility problems in page images to info@sandroid.org. Notations on the program listing read, in part:

	ASSEMBLE REVISION 249 OF AGC PROGRAM COLOSSUS BY NASA 2021111-041
	20'35 OCT. 28,1968
Note that the date is the date of the printout, not the date of the program revision.

018229,000002:                                                                                                  ## Copyright:   Public domain.
018230,000003:                                                                                                  ## Filename:    SYSTEM_TEST_STANDARD_LEAD_INS.agc
018231,000004:                                                                                                  ## Purpose:     Part of the source code for Colossus, build 249.
018232,000005:                                                                                                  ##              It is part of the source code for the Command Module's (CM)
018233,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 9.
018234,000007:                                                                                                  ## Assembler:   yaYUL
018235,000008:                                                                                                  ## Reference:   pp. 413-415.
018236,000009:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
018237,000010:                                                                                                  ## Website:     www.ibiblio.org/apollo.
018238,000011:                                                                                                  ## Mod history: 08/07/04 RSB.   Adapted from similar Luminary 131 file.
018239,000012:                                                                                                  ##              2017-01-06 RSB  Page numbers now agree with those on the
018240,000013:                                                                                                  ##                              original harcopy, as opposed to the PDF page
018241,000014:                                                                                                  ##                              numbers in 1701.pdf.
018242,000015:                                                                                                  ##              2017-01-20 RSB  Cross-diff'd comment text (not whitespace)
018243,000016:                                                                                                  ##                              vs the already-proofed corresponding Colossus
018244,000017:                                                                                                  ##                              237 and Comanche 55 source-code files
018245,000018:                                                                                                  ##                              and corrected errors found.
018246,000019:                                                                                                  ##
018247,000020:                                                                                                  ## The contents of the "Colossus249" files, in general, are transcribed 
018248,000021:                                                                                                  ## from a scanned copy of the program listing.  Notations on this
018249,000022:                                                                                                  ## document read, in part:
018250,000023:                                                                                                  ##
018251,000024:                                                                                                  ##      Assemble revision 249 of AGC program Colossus by NASA
018252,000025:                                                                                                  ##      2021111-041.  October 28, 1968.  
018253,000026:                                                                                                  ##
018254,000027:                                                                                                  ##      This AGC program shall also be referred to as
018255,000028:                                                                                                  ##                              Colossus 1A
018256,000029:                                                                                                  ##
018257,000030:                                                                                                  ##      Prepared by
018258,000031:                                                                                                  ##                      Massachusetts Institute of Technology
018259,000032:                                                                                                  ##                      75 Cambridge Parkway
018260,000033:                                                                                                  ##                      Cambridge, Massachusetts
018261,000034:                                                                                                  ##      under NASA contract NAS 9-4065.
018262,000035:                                                                                                  ##
018263,000036:                                                                                                  ## Refer directly to the online document mentioned above for further information.
018264,000037:                                                                                                  ## Please report any errors (relative to the scanned pages) to info@sandroid.org.
018265,000038:                                                                                                  ##
018266,000039:                                                                                                  ## In some cases, where the source code for Luminary 131 overlaps that of 
018267,000040:                                                                                                  ## Colossus 249, this code is instead copied from the corresponding Luminary 131
018268,000041:                                                                                                  ## source file, and then is proofed to incorporate any changes.
018269,000042: 

Page 413

018271,000044: 22,3310  E5,1671                                  EBANK=   XSM                                   
018272,000045: 
018273,000046: 33,2000                                           BANK     33                                    
018274,000047: 04,2000                                           SETLOC   E/PROG                                
018275,000048: 04,2000                                           BANK                                           
018276,000049: 
018277,000050: 04,2557                                           COUNT*   $$/P07                                
018278,000051: 
018279,000052:                                                                                                  #  SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
018280,000053: 
018281,000054:                                                                                                  #  E/BKCALL      FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
018282,000055: 
018283,000056:                                                                                                  #  THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED.  LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
018284,000057:                                                                                                  #  IS NOT POSSIBLE.
018285,000058: 
018286,000059:                                                                                                  #  THE CALLING SEQUENCE IS:
018287,000060: 
018288,000061:                                                                                                  #        TC      BANKCALL
018289,000062:                                                                                                  #        CADR    E/BKCALL
018290,000063:                                                                                                  #        CADR    ROUTINE         WHERE YOU WANT TO GO IN FIXED.
018291,000064:                                                                                                  #        RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
018292,000065:                                                                                                  #        RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
018293,000066:                                                                                                  #        RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
018294,000067: 
018295,000068:                                                                                                  #  THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
018296,000069:                                                                                                  #  OTHER EMEMORY PROGRAMS.
018297,000070: 
018298,000071:                                                                                                  #  A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
018299,000072: 
018300,000073: 04,2557           52134        E/BKCALL           DXCH     BUF2                                  #  SAVE A,L AND GET DP RETURN.
018301,000074: 04,2560           52365                           DXCH     EBUF2                                 #  SAVE DP RETURN.
018302,000075: 04,2561           24364                           INCR     EBUF2                                 #  RETURN +1 BECAUSE DOUBLE CADR.
018303,000076: 04,2562           30006                           CA       BBANK                                 
018304,000077: 04,2563           74747                           MASK     LOW10                                 #  GET CURRENT EBANK.  (SBANK SOMEDAY)
018305,000078: 04,2564           26365                           ADS      EBUF2      +1                         #  FORM BBCON.  (WAS FBANK)
018306,000079: 04,2565           50364                           NDX      EBUF2                                 
018307,000080: 04,2566           27777                           CA       0          -1                         #  GET CADR OF ROUTINE.
018308,000081: 04,2567           04561                           TC       SWCALL                                #  GO TO ROUTINE, SETTING Q TO SWRETURN
018309,000082:                                                                                                  #  AND RESTORING A + L.
018310,000083: 04,2570           02574                           TC       +4                                    #  TX Q, V34, OR BAD STALL RETURN.
018311,000084: 04,2571           02573                           TC       +2                                    #  PROCEED OR GOOD STALL RETURN.
018312,000085: 04,2572           24364                           INCR     EBUF2                                 #  ENTER OR RECYCLE RETURN.
018313,000086: 04,2573           24364                           INCR     EBUF2                                 
018314,000087: 04,2574           52365        E/SWITCH           DXCH     EBUF2                                 
018315,000088: 04,2575           52006                           DTCB                                           
018316,000089: 

Page 414

018318,000091:                                                                                                  #  E/CALL        FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
018319,000092: 
018320,000093:                                                                                                  #  THE CALLING SEQUENCE IS...
018321,000094: 
018322,000095:                                                                                                  #        RTB
018323,000096:                                                                                                  #                E/CALL
018324,000097:                                                                                                  #        CADR    ROUTINE                 THE INTERPRETIVE SUBROUTINE YOU WANT.
018325,000098:                                                                                                  #                                        RETURNS HERE IN INTERPRETIVE.
018326,000099: 
018327,000100: 04,2576           22164        E/CALL             LXCH     LOC                                   #  ADRES -1 OF CADR.
018328,000101: 04,2577           50001                           INDEX    L                                     
018329,000102: 04,2600           30001                           CA       L                                     #  CADR IN A.
018330,000103: 04,2601           24001                           INCR     L                                     
018331,000104: 04,2602           24001                           INCR     L                                     #  RETURN ADRES IN L.
018332,000105: 04,2603           52365                           DXCH     EBUF2                                 #  STORE CADR AND RETURN.
018333,000106: 04,2604           06006                           TC       INTPRET                               
018334,000107: 04,2605           77624                           CALL                                           
018335,000108: 04,2606           00364                                    EBUF2                                 #  INDIRECTLY EXECUTE ROUTINE.  IT MUST
018336,000109: 04,2607           77776                           EXIT                                           #  LEAVE VIA RVQ OR EQUIVALENT.
018337,000110: 04,2610           22365                           LXCH     EBUF2      +1                         #  PICK UP RETURN.
018338,000111: 04,2611           16010                           TCF      INTPRET    +2                         #  SET LOC AND RETURB TO CALLER
018339,000112: 

Page 415

018341,000114:                                                                                                  #  E/JOBWAK      FOR WAKING UP ERASABLE MEMORY JOBS.
018342,000115: 
018343,000116:                                                                                                  #  THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
018344,000117: 
018345,000118:                                                                                                  #  THE CALLING SEQUENCE IS:
018346,000119: 
018347,000120:                                                                                                  #        INHINT
018348,000121:                                                                                                  #        .
018349,000122:                                                                                                  #        .
018350,000123:                                                                                                  #        CA      WAKEADR         ADDRESS OF SLEEPING JOB
018351,000124:                                                                                                  #        TC      IBNKCALL
018352,000125:                                                                                                  #        CADR    E/JOBWAK
018353,000126:                                                                                                  #        .                       RETURNS HERE
018354,000127:                                                                                                  #        .
018355,000128:                                                                                                  #        .
018356,000129:                                                                                                  #        RELINT                  IF YOU DID AN INHINT.
018357,000130: 
018358,000131: 33,2000                                           BANK     33                                    
018359,000132: 04,2000                                           SETLOC   E/PROG                                
018360,000133: 04,2000                                           BANK                                           
018361,000134: 
018362,000135: 04,2612                                           COUNT*   $$/P07                                
018363,000136: 
018364,000137: 04,2612           05074        E/JOBWAK           TC       JOBWAKE                               #  ARRIVE IWTH ADRES IN A.
018365,000138: 04,2613           44700                           CS       BIT11                                 
018366,000139: 04,2614           50064                           NDX      LOCCTR                                
018367,000140: 04,2615           26164                           ADS      LOC                                   #  KNOCK FIXED MEMORY BIT OUT OF ADRES.
018368,000141: 04,2616           00072                           TC       RUPTREG3                              #  RETURN
018369,000142: 
018370,000143:                                                                                                  #  THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
018371,000144:                                                                                                  #  PRELAUNCH ALIGN.  THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
018372,000145: 
018373,000146: 33,2000                                           BANK     33                                    
018374,000147: 33,2000                                           SETLOC   TESTLEAD                              
018375,000148: 33,2000                                           BANK                                           
018376,000149: 
018377,000150: 33,2000                                           COUNT    33/COMST                              
018378,000151: 
018379,000152: 33,2000  E5,1425                                  EBANK=   QPLACE                                
018380,000153: 
018381,000154: 33,2000           03425        COMPVER            TC       GCOMPVER                              #  MUST BE 33,2000.
018382,000155: 
018383,000156: 33,2001           03132        GTSCPSS1           TC       GTSCPSS                               #  MUST BE AT 33,2001
018384,000157: 
018385,000158: 33,2002           05243        REDO               TC       NEWMODEX                              #  DISPLAY MM 07.
018386,000159: 33,2003           00007                           MM       07         B-14                       #  FALL INTO IMUTEST
018387,000160: 

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