Source Code
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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A scan by Ron Burkey has superceded it, made from a more-legible copy from the collection of original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. 28,1968Note that the date is the date of the printout, not the date of the program revision. |
018221,000002: ## Copyright: Public domain.
018222,000003: ## Filename: SYSTEM_TEST_STANDARD_LEAD_INS.agc
018223,000004: ## Purpose: Part of the source code for Colossus, build 249.
018224,000005: ## It is part of the source code for the Command Module's (CM)
018225,000006: ## Apollo Guidance Computer (AGC), for Apollo 9.
018226,000007: ## Assembler: yaYUL
018227,000008: ## Reference: pp. 413-415.
018228,000009: ## Contact: Ron Burkey <info@sandroid.org>.
018229,000010: ## Website: www.ibiblio.org/apollo.
018230,000011: ## Mod history: 08/07/04 RSB. Adapted from similar Luminary 131 file.
018231,000012: ## 2017-01-06 RSB Page numbers now agree with those on the
018232,000013: ## original harcopy, as opposed to the PDF page
018233,000014: ## numbers in 1701.pdf.
018234,000015: ## 2017-01-20 RSB Cross-diff'd comment text (not whitespace)
018235,000016: ## vs the already-proofed corresponding Colossus
018236,000017: ## 237 and Comanche 55 source-code files
018237,000018: ## and corrected errors found.
018238,000019: ##
018239,000020: ## The contents of the "Colossus249" files, in general, are transcribed
018240,000021: ## from a scanned copy of the program listing. Notations on this
018241,000022: ## document read, in part:
018242,000023: ##
018243,000024: ## Assemble revision 249 of AGC program Colossus by NASA
018244,000025: ## 2021111-041. October 28, 1968.
018245,000026: ##
018246,000027: ## This AGC program shall also be referred to as
018247,000028: ## Colossus 1A
018248,000029: ##
018249,000030: ## Prepared by
018250,000031: ## Massachusetts Institute of Technology
018251,000032: ## 75 Cambridge Parkway
018252,000033: ## Cambridge, Massachusetts
018253,000034: ## under NASA contract NAS 9-4065.
018254,000035: ##
018255,000036: ## Refer directly to the online document mentioned above for further information.
018256,000037: ## Please report any errors (relative to the scanned pages) to info@sandroid.org.
018257,000038: ##
018258,000039: ## In some cases, where the source code for Luminary 131 overlaps that of
018259,000040: ## Colossus 249, this code is instead copied from the corresponding Luminary 131
018260,000041: ## source file, and then is proofed to incorporate any changes.
018261,000042:
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Page 413 |
018263,000044: 22,3310 E5,1671 EBANK= XSM
018264,000045:
018265,000046: 33,2000 BANK 33
018266,000047: 04,2000 SETLOC E/PROG
018267,000048: 04,2000 BANK
018268,000049:
018269,000050: 04,2557 COUNT* $$/P07
018270,000051:
018271,000052: # SPECIAL PROGRAMS TO EASE THE PANGS OF ERASABLE MEMORY PROGRAMS.
018272,000053:
018273,000054: # E/BKCALL FOR DOING BANKCALLS FROM AND RETURNING TO ERASABLE.
018274,000055:
018275,000056: # THIS ROUTINE IS CALLABLE FROM ERASABLE OR FIXED. LIKE BANKCALL, HOWEVER, SWITCHING BETWEEN S3 AND S4
018276,000057: # IS NOT POSSIBLE.
018277,000058:
018278,000059: # THE CALLING SEQUENCE IS:
018279,000060:
018280,000061: # TC BANKCALL
018281,000062: # CADR E/BKCALL
018282,000063: # CADR ROUTINE WHERE YOU WANT TO GO IN FIXED.
018283,000064: # RETURN HERE FROM DISPLAY TERMINATE, BAD STALL OR TC Q.
018284,000065: # RETURN HERE FROM DISPLAY PROCEED OR GOOD RETURN FROM STALL.
018285,000066: # RETURN HERE FROM DISPLAY ENTER OR RECYCLE.
018286,000067:
018287,000068: # THIS ROUTINE REQUIRES TWO ERASABLES (EBUF2, +1) IN UNSWITCHED WHICH ARE UNSHARED BY INTERRUPTS AND
018288,000069: # OTHER EMEMORY PROGRAMS.
018289,000070:
018290,000071: # A + L ARE PRESERVED THROUGH BANKCALL AND E/BKCALL.
018291,000072:
018292,000073: 04,2557 52134 E/BKCALL DXCH BUF2 # SAVE A,L AND GET DP RETURN.
018293,000074: 04,2560 52365 DXCH EBUF2 # SAVE DP RETURN.
018294,000075: 04,2561 24364 INCR EBUF2 # RETURN +1 BECAUSE DOUBLE CADR.
018295,000076: 04,2562 30006 CA BBANK
018296,000077: 04,2563 74747 MASK LOW10 # GET CURRENT EBANK. (SBANK SOMEDAY)
018297,000078: 04,2564 26365 ADS EBUF2 +1 # FORM BBCON. (WAS FBANK)
018298,000079: 04,2565 50364 NDX EBUF2
018299,000080: 04,2566 27777 CA 0 -1 # GET CADR OF ROUTINE.
018300,000081: 04,2567 04561 TC SWCALL # GO TO ROUTINE, SETTING Q TO SWRETURN
018301,000082: # AND RESTORING A + L.
018302,000083: 04,2570 02574 TC +4 # TX Q, V34, OR BAD STALL RETURN.
018303,000084: 04,2571 02573 TC +2 # PROCEED OR GOOD STALL RETURN.
018304,000085: 04,2572 24364 INCR EBUF2 # ENTER OR RECYCLE RETURN.
018305,000086: 04,2573 24364 INCR EBUF2
018306,000087: 04,2574 52365 E/SWITCH DXCH EBUF2
018307,000088: 04,2575 52006 DTCB
018308,000089:
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Page 414 |
018310,000091: # E/CALL FOR CALLING A FIXED MEMORY INTERPRETIVE SUBROUTINE FROM ERASABLE AND RETURNING TO ERASABLE.
018311,000092:
018312,000093: # THE CALLING SEQUENCE IS...
018313,000094:
018314,000095: # RTB
018315,000096: # E/CALL
018316,000097: # CADR ROUTINE THE INTERPRETIVE SUBROUTINE YOU WANT.
018317,000098: # RETURNS HERE IN INTERPRETIVE.
018318,000099:
018319,000100: 04,2576 22164 E/CALL LXCH LOC # ADRES -1 OF CADR.
018320,000101: 04,2577 50001 INDEX L
018321,000102: 04,2600 30001 CA L # CADR IN A.
018322,000103: 04,2601 24001 INCR L
018323,000104: 04,2602 24001 INCR L # RETURN ADRES IN L.
018324,000105: 04,2603 52365 DXCH EBUF2 # STORE CADR AND RETURN.
018325,000106: 04,2604 06006 TC INTPRET
018326,000107: 04,2605 77624 CALL
018327,000108: 04,2606 00364 EBUF2 # INDIRECTLY EXECUTE ROUTINE. IT MUST
018328,000109: 04,2607 77776 EXIT # LEAVE VIA RVQ OR EQUIVALENT.
018329,000110: 04,2610 22365 LXCH EBUF2 +1 # PICK UP RETURN.
018330,000111: 04,2611 16010 TCF INTPRET +2 # SET LOC AND RETURB TO CALLER
018331,000112:
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Page 415 |
018333,000114: # E/JOBWAK FOR WAKING UP ERASABLE MEMORY JOBS.
018334,000115:
018335,000116: # THIS ROUTINE MUST BE CALLED IN INTERRUPT OR WITH INTERRUPTS INHIBITED.
018336,000117:
018337,000118: # THE CALLING SEQUENCE IS:
018338,000119:
018339,000120: # INHINT
018340,000121: # .
018341,000122: # .
018342,000123: # CA WAKEADR ADDRESS OF SLEEPING JOB
018343,000124: # TC IBNKCALL
018344,000125: # CADR E/JOBWAK
018345,000126: # . RETURNS HERE
018346,000127: # .
018347,000128: # .
018348,000129: # RELINT IF YOU DID AN INHINT.
018349,000130:
018350,000131: 33,2000 BANK 33
018351,000132: 04,2000 SETLOC E/PROG
018352,000133: 04,2000 BANK
018353,000134:
018354,000135: 04,2612 COUNT* $$/P07
018355,000136:
018356,000137: 04,2612 05074 E/JOBWAK TC JOBWAKE # ARRIVE IWTH ADRES IN A.
018357,000138: 04,2613 44700 CS BIT11
018358,000139: 04,2614 50064 NDX LOCCTR
018359,000140: 04,2615 26164 ADS LOC # KNOCK FIXED MEMORY BIT OUT OF ADRES.
018360,000141: 04,2616 00072 TC RUPTREG3 # RETURN
018361,000142:
018362,000143: # THESE PROGRAMS ARE PROVIDED TO ALLOW OVERLAY OF BANKS 30 THRU 33 OF THE 205 VERSIONS OF SYSTEM TESTS AND
018363,000144: # PRELAUNCH ALIGN. THE INTENT IS TO ALLOW THE STG AND HYBRID LABS TO RUN ALL THE TESTS WITH COLOSSUS.
018364,000145:
018365,000146: 33,2000 BANK 33
018366,000147: 33,2000 SETLOC TESTLEAD
018367,000148: 33,2000 BANK
018368,000149:
018369,000150: 33,2000 COUNT 33/COMST
018370,000151:
018371,000152: 33,2000 E5,1425 EBANK= QPLACE
018372,000153:
018373,000154: 33,2000 03425 COMPVER TC GCOMPVER # MUST BE 33,2000.
018374,000155:
018375,000156: 33,2001 03132 GTSCPSS1 TC GTSCPSS # MUST BE AT 33,2001
018376,000157:
018377,000158: 33,2002 05243 REDO TC NEWMODEX # DISPLAY MM 07.
018378,000159: 33,2003 00007 MM 07 B-14 # FALL INTO IMUTEST
018379,000160:
End of include-file SYSTEM_TEST_STANDARD_LEAD_INS.agc. Parent file is MAIN.agc