Source Code
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These source-code files are part of a reconstructed copy of Luminary 98, a
development version of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Luminary 99 revision 1 previously
transcribed from a digitized copy of that program. The code was then updated
by undoing changes described in original Luminary memo 85, using asterisks
indicating changed lines in the listing as a guide. While no listing of this
version is known to exist, nor are the memory-bank checksums available,
the reconstruction is believed to be correct because it was an an intermediate
step in reconstructing Luminary 97 whose reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152G.
Note that page numbers in the reconstructed code match those on the Luminary 099
revision 001 printout, although the added code would likely have changed page
numbers for a real Luminary 98 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.
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058499,000002: ## Copyright: Public domain.
058500,000003: ## Filename: RTB_OP_CODES.agc
058501,000004: ## Purpose: A section of Luminary revision 98.
058502,000005: ## It is part of the reconstructed source code for the a
058503,000006: ## development version of the flight software for the Lunar
058504,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
058505,000008: ## The code has been recreated from a copy of Luminary 99
058506,000009: ## revision 001, using asterisks indicating changed lines in
058507,000010: ## the listing and Luminary Memo #85, which lists changes between
058508,000011: ## Luminary 98 and 99.
058509,000012: ## Reference: pp. 1397-1402
058510,000013: ## Assembler: yaYUL
058511,000014: ## Contact: Ron Burkey <info@sandroid.org>.
058512,000015: ## Website: www.ibiblio.org/apollo/index.html
058513,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
058514,000017:
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Page 1397
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058516,000019: 22,3773 BANK 22
058517,000020: 10,2000 SETLOC RTBCODES
058518,000021: 10,2000 BANK
058519,000022:
058520,000023: 10,3573 E5,1664 EBANK= XNB
058521,000024: 10,3573 COUNT* $$/RTB
058522,000025:
058523,000026: # LOAD TIME2, TIME1 INTO MPAC:
058524,000027:
058525,000028: 10,3573 00006 LOADTIME EXTEND
058526,000029: 10,3574 30025 DCA TIME2
058527,000030: 10,3575 16055 TCF SLOAD2
058528,000031:
058529,000032: # CONVERT THE SINGLE PRECISION 2'S COMPLEMENT NUMBER ARRIVING IN MPAC (SCALED IN HALF-REVOLUTIONS) TO A
058530,000033: # DP 1'S COMPLEMENT NUMBER SCALED IN REVOLUTIONS.
058531,000034:
058532,000035: 10,3576 10154 CDULOGIC CCS MPAC
058533,000036: 10,3577 34755 CAF ZERO
058534,000037: 10,3600 13603 TCF +3
058535,000038: 10,3601 13602 NOOP
058536,000039: 10,3602 44736 CS HALF
058537,000040:
058538,000041: 10,3603 54155 TS MPAC +1
058539,000042: 10,3604 34755 CAF ZERO
058540,000043: 10,3605 56154 XCH MPAC
058541,000044: 10,3606 00006 EXTEND
058542,000045: 10,3607 74736 MP HALF
058543,000046: 10,3610 20155 DAS MPAC
058544,000047: 10,3611 16061 TCF DANZIG # MODE IS ALREADY AT DOUBLE-PRECISION
058545,000048:
058546,000049: # FORCE TP SIGN AGREEMENT IN MPAC:
058547,000050:
058548,000051: 10,3612 07257 SGNAGREE TC TPAGREE
058549,000052: 10,3613 16061 TCF DANZIG
058550,000053:
058551,000054: # CONVERT THE DP 1'S COMPLEMENT ANGLE SCALED IN REVOLUTIONS TO A SINGLE PRECISION 2'S COMPLEMENT ANGLE
058552,000055: # SCALED IN HALF-REVOLUTIONS.
058553,000056:
058554,000057: 10,3614 03644 1STO2S TC 1TO2SUB
058555,000058: 10,3615 34755 CAF ZERO
058556,000059: 10,3616 54155 TS MPAC +1
058557,000060: 10,3617 16060 TCF NEWMODE
058558,000061:
058559,000062: # DO 1STO2S ON A VECTOR OF ANGLES:
058560,000063:
058561,000064: 10,3620 03644 V1STO2S TC 1TO2SUB # ANSWER ARRIVES IN A AND MPAC.
058562,000065:
058563,000066: 10,3621 52162 DXCH MPAC +5
058564,000067: 10,3622 52155 DXCH MPAC
058565,000068: 10,3623 03644 TC 1TO2SUB
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Page 1398
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058567,000070: 10,3624 54156 TS MPAC +2
058568,000071:
058569,000072: 10,3625 52160 DXCH MPAC +3
058570,000073: 10,3626 52155 DXCH MPAC
058571,000074: 10,3627 03644 TC 1TO2SUB
058572,000075: 10,3630 54155 TS MPAC +1
058573,000076:
058574,000077: 10,3631 30161 CA MPAC +5
058575,000078: 10,3632 54154 TS MPAC
058576,000079:
058577,000080: 10,3633 34753 TPMODE CAF ONE # MODE IS TP.
058578,000081: 10,3634 16060 TCF NEWMODE
058579,000082:
058580,000083: # V1STO2S FOR 2 COMPONENT VECTOR. USED BY RR.
058581,000084:
058582,000085: 10,3635 03644 2V1STO2S TC 1TO2SUB
058583,000086: 10,3636 52160 DXCH MPAC +3
058584,000087: 10,3637 52155 DXCH MPAC
058585,000088: 10,3640 03644 TC 1TO2SUB
058586,000089: 10,3641 54001 TS L
058587,000090: 10,3642 30157 CA MPAC +3
058588,000091: 10,3643 16055 TCF SLOAD2
058589,000092:
058590,000093: # SUBROUTINE TO DO DOUBLING AND 1'S TO 2'S CONVERSION:
058591,000094:
058592,000095: 10,3644 52155 1TO2SUB DXCH MPAC # FINAL MPAC +1 UNSPECIFIED.
058593,000096: 10,3645 20001 DDOUBL
058594,000097: 10,3646 10000 CCS A
058595,000098: 10,3647 64753 AD ONE
058596,000099: 10,3650 13652 TCF +2
058597,000100: 10,3651 40000 COM # THIS WAS REVERSE OF MSU.
058598,000101:
058599,000102: 10,3652 54154 TS MPAC # AND SKIP ON OVERFLOW.
058600,000103: 10,3653 00002 TC Q
058601,000104:
058602,000105: 10,3654 50000 INDEX A # OVERFLOW UNCORRECT AND IN MSU.
058603,000106: 10,3655 34734 CAF LIMITS
058604,000107: 10,3656 26154 ADS MPAC
058605,000108: 10,3657 00002 TC Q
058606,000109:
058607,000110: # THE FOLLOWING ROUTINE INCREMENTS IN 2S COMPLEMENT THE REGISTER WHOSE ADDRESS IS IN BUF BY THE 1S COMPL.
058608,000111: # QUANTITY FOUND IN TEM2. THIS MAY BE USED TO INCREMENT DESIRED IMU AND OPTICS CDU ANGLES OR ANY OTHER 2S COMPL.
058609,000112: # (+0 UNEQUAL TO -0) QUANTITY. MAY BE CALLED BY BANKCALL/SWCALL.
058610,000113:
058611,000114: 10,3660 54142 CDUINC TS TEM2 # 1S COMPL.QUANT. ARRIVES IN ACC. STORE IT
058612,000115: 10,3661 50130 INDEX BUF
058613,000116: 10,3662 10000 CCS 0 # CHANGE 2S COMPL. ANGLE(IN BUF)INTO 1S
058614,000117: 10,3663 64753 AD ONE
058615,000118: 10,3664 13670 TCF +4
058616,000119: 10,3665 64753 AD ONE
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Page 1399
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058618,000121: 10,3666 64753 AD ONE # OVERFLOW HERE IF 2S COMPL. IS 180 DEG.
058619,000122: 10,3667 40000 COM
058620,000123:
058621,000124: 10,3670 60142 AD TEM2 # SULT MOVES FROM 2ND TO 3D QUAD. (OR BACK)
058622,000125: 10,3671 10000 CCS A # BACK TO 2S COMPL.
058623,000126: 10,3672 64753 AD ONE
058624,000127: 10,3673 13675 TCF +2
058625,000128: 10,3674 40000 COM
058626,000129: 10,3675 54142 TS TEM2 # STORE 14BIT QUANTITY WITH PRESENT SIGN
058627,000130: 10,3676 13702 TCF +4
058628,000131: 10,3677 50000 INDEX A # SIGN.
058629,000132: 10,3700 34734 CAF LIMITS # FIX IT, BY ADDING IN 37777 OR 40000
058630,000133: 10,3701 60142 AD TEM2
058631,000134:
058632,000135: 10,3702 50130 INDEX BUF
058633,000136: 10,3703 54000 TS 0 # STORE NEW ANGLE IN 2S COMPLEMENT.
058634,000137: 10,3704 00002 TC Q
058635,000138:
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Page 1400
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058637,000140: # RTB TO TORQUE GYROS, EXCEPT FOR THE CALL TO IMUSTALL. ECADR OF COMMANDS ARRIVES IN X1.
058638,000141:
058639,000142: 10,3705 50120 PULSEIMU INDEX FIXLOC # ADDRESS OF GYRO COMMANDS SHOULD BE IN X1
058640,000143: 10,3706 30046 CA X1
058641,000144: 10,3707 04616 TC BANKCALL
058642,000145: 10,3710 17323 CADR IMUPULSE
058643,000146: 10,3711 16061 TCF DANZIG
058644,000147:
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Page 1401
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058646,000149: # THE SUBROUTINE SIGNMPAC SETS C(MPAC, MPAC +1) TO SIGN(MPAC).
058647,000150: # FOR THIS, ONLY THE CONTENTS OF MPAC ARE EXAMINED. ALSO +0 YIELDS POSMAX AND -0 YIELDS NEGMAX.
058648,000151:
058649,000152: # ENTRY MAY BE BY EITHER OF THE FOLLOWING:
058650,000153: # 1. LIMIT THE SIZE OF MPAC ON INTERPRETIVE OVERFLOW:
058651,000154: # ENTRY: BOVB
058652,000155: # SIGNMPAC
058653,000156: # 2. GENERATE IN MPAC THE SIGNUM FUNCTION OF MPAC:
058654,000157: # ENTRY: RTB
058655,000158: # SIGNMPAC
058656,000159: # IN EITHER CASE, RETURN IS TO THE NEXT INTERPRETIVE INSTRUCTION IN THE CALLING SEQUENCE.
058657,000160:
058658,000161: 10,3712 00006 SIGNMPAC EXTEND
058659,000162: 10,3713 34733 DCA DPOSMAX
058660,000163: 10,3714 52155 DXCH MPAC
058661,000164: 10,3715 10000 CCS A
058662,000165: 10,3716 34755 DPMODE CAF ZERO # SETS MPAC +2 TO ZERO IN THE PROCESS
058663,000166: 10,3717 16057 TCF SLOAD2 +2
058664,000167: 10,3720 13721 TCF +1
058665,000168: 10,3721 00006 EXTEND
058666,000169: 10,3722 44733 DCS DPOSMAX
058667,000170: 10,3723 16055 TCF SLOAD2
058668,000171:
058669,000172: # RTB OP CODE NORMUNIT IS LIKE INTERPRETIVE INSTRUCTION UNIT, EXCEPT THAT IT CAN BE DEPENDED ON NOT TO BLOW
058670,000173: # UP WHEN THE VECTOR BEING UNITIZED IS VERY SMALL -- IT WILL BLOW UP WHEN ALL COMPONENTS ARE ZERO. IF NORMUNIT
058671,000174: # IS USED AND THE UPPER ORDER HALVES OF ALL COMPONENTS ARE ZERO, THE MAGNITUDE RETURNED IN 36D WILL BE TOO LARGE
058672,000175: # BY A FACTOR OF 2(13) AND THE SQUARED MAGNITUDE RETURNED AT 34D WILL BE TOO BIG BY A FACTOR OF 2(26).
058673,000176:
058674,000177: 10,3724 34753 NORMUNX1 CAF ONE
058675,000178: 10,3725 13727 TCF NORMUNIT +1
058676,000179: 10,3726 34755 NORMUNIT CAF ZERO
058677,000180: 10,3727 60120 AD FIXLOC
058678,000181: 10,3730 54156 TS MPAC +2
058679,000182: 10,3731 04616 TC BANKCALL # GET SIGN AGREEMENT IN ALL COMPONENTS
058680,000183: 10,3732 01010 CADR VECAGREE
058681,000184: 10,3733 10154 CCS MPAC
058682,000185: 10,3734 13770 TCF NOSHIFT
058683,000186: 10,3735 13737 TCF +2
058684,000187: 10,3736 13770 TCF NOSHIFT
058685,000188: 10,3737 10157 CCS MPAC +3
058686,000189: 10,3740 13770 TCF NOSHIFT
058687,000190: 10,3741 13743 TCF +2
058688,000191: 10,3742 13770 TCF NOSHIFT
058689,000192: 10,3743 10161 CCS MPAC +5
058690,000193: 10,3744 13770 TCF NOSHIFT
058691,000194: 10,3745 13747 TCF +2
058692,000195: 10,3746 13770 TCF NOSHIFT
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Page 1402
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058694,000197: 10,3747 30155 CA MPAC +1 # SHIFT ALL COMPONENTS LEFT 13
058695,000198: 10,3750 00006 EXTEND
058696,000199: 10,3751 74736 MP BIT14
058697,000200: 10,3752 20155 DAS MPAC # DAS GAINS A LITTLE ACCURACY
058698,000201: 10,3753 30160 CA MPAC +4
058699,000202: 10,3754 00006 EXTEND
058700,000203: 10,3755 74736 MP BIT14
058701,000204: 10,3756 20160 DAS MPAC +3
058702,000205: 10,3757 30162 CA MPAC +6
058703,000206: 10,3760 00006 EXTEND
058704,000207: 10,3761 74736 MP BIT14
058705,000208: 10,3762 20162 DAS MPAC +5
058706,000209: 10,3763 34761 CAF THIRTEEN
058707,000210: 10,3764 50156 INDEX MPAC +2
058708,000211: 10,3765 54045 TS 37D
058709,000212: 10,3766 04635 OFFTUNIT TC POSTJUMP
058710,000213: 10,3767 01024 CADR UNIT +1 # SKIP THE "TC VECAGREE" DONE AT UNIT
058711,000214:
058712,000215: 10,3770 34755 NOSHIFT CAF ZERO
058713,000216: 10,3771 13764 TCF OFFTUNIT -2
058714,000217:
058715,000218: # RTB VECSGNAG ... FORCES SIGN AGREEMENT OF VECTOR IN MPAC.
058716,000219:
058717,000220: 10,3772 04616 VECSGNAG TC BANKCALL
058718,000221: 10,3773 01010 CADR VECAGREE
058719,000222: 10,3774 06061 TC DANZIG
058720,000223:
058721,000224:
End of include-file RTB_OP_CODES.agc. Parent file is MAIN.agc