Source Code
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These source-code files are part of a reconstructed copy of Luminary 173, the
second (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 178. Changes
between revision 173 and 178 were backed out, as described by Luminary memo 167
(revision 1). The reconstruction was verified by matching memory-bank checksums
to those listed in drawing 2021152N. Note that page numbers in the reconstructed
code match those for the baseline log section mentioned in each file's changelog;
the page numbers for a real Luminary 173 listing would be different.
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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064619,000002: ## Copyright: Public domain.
064620,000003: ## Filename: SPS_BACK-UP_RCS_CONTROL.agc
064621,000004: ## Purpose: A section of Luminary revision 173.
064622,000005: ## It is part of the reconstructed source code for the second
064623,000006: ## (unflown) release of the flight software for the Lunar
064624,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
064625,000008: ## The code has been recreated from a reconstructed copy of
064626,000009: ## Luminary 178, as well as Luminary memo 167 (revision 1).
064627,000010: ## It has been adapted such that the resulting bugger words
064628,000011: ## exactly match those specified for Luminary 173 in NASA
064629,000012: ## drawing 2021152N, which gives relatively high confidence
064630,000013: ## that the reconstruction is correct.
064631,000014: ## Reference: pp. 1495-1498
064632,000015: ## Assembler: yaYUL
064633,000016: ## Contact: Ron Burkey <info@sandroid.org>.
064634,000017: ## Website: www.ibiblio.org/apollo/index.html
064635,000018: ## Mod history: 2019-09-18 MAS Created from Luminary 178.
064636,000019:
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Page 1495
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064638,000021: # PROGRAM NAME: SPSRCS
064639,000022:
064640,000023: # AUTHOR: EDGAR M. OSHIKA (AC ELECTRONICS)
064641,000024:
064642,000025: # MODIFIED: TO RETURN TO ALL AXES VIA Q BY P.S.WEISSMAN, OCT 7, 1968
064643,000026:
064644,000027: # MODIFIED TO IMPROVE BENDING STABILITY BY G.KALAN,FEB.14,1969
064645,000028: # FUNCTIONAL DESCRIPTION:
064646,000029:
064647,000030: # THIS PROGRAM CONTROLS THE FIRING OF ALL RCS JETS IN THE DOCKED CONFIGURATION ACCORDING TO THE FOLLOWING PHASE
064648,000031: # PLANE LOGIC.
064649,000032:
064650,000033: # 1. JET SENSE TEST (SPSRCS)
064651,000034:
064652,000035: # IF JETS ARE FIRING NEGATIVELY,SET OLDSENSE NEGATIVE AND CONTINUE
064653,000036: # IF JETS ARE FIRING POSITIVELY,SET OLDSENSE POSITIVE AND CONTINUE
064654,000037: # IF JETS ARE NOT FIRING,SET OLDSENSE TO ZERO AND GO TO OUTER RATE LIMIT TEST
064655,000038:
064656,000039: # 2. RATE DEAD BAND TEST
064657,000040:
064658,000041: # IF JETS ARE FIRING NEGATIVELY AND RATE IS GREATER THAN TARGET RATE,LEAVE
064659,000042: # JETS ON AND GO TO INHIBITION LOGIC. OTHERWISE,CONTINUE.
064660,000043: # IF JETS ARE FIRING POSITIVELY AND RATE IS LESS THAN TARGET RATE,LEAVE
064661,000044: # JETS ON AND GO TO INHIBITION LOGIC. OTHERWISE,CONTINUE.
064662,000045:
064663,000046: # 3. OUTER RATE LIMIT TEST (SPSSTART)
064664,000047:
064665,000048: # IF MAGNITUDE OF EDOT IS GREATER THAN 1.73 DEG/SEC SET JET FIRING TIME
064666,000049: # TO REDUCE RATE AND GO TO INHIBITION LOGIC. OTHERWISE,CONTINUE.
064667,000050:
064668,000051: # 4. COAST ZONE TEST
064669,000052:
064670,000053: # IF STATE (E,EDOT) IS BELOW LINE E + 4 X EDOT > -1.4 DEG AND EDOT IS LESS THAN 1.30 DEG/SEC SET JET TIME POSI-
064671,000054: # TIVE AND CONTINUE. OTHERWISE,SET JET FIRING TIME TO ZERO AND CONTINUE.
064672,000055: # IF STATE IS ABOVE LINE E + 4X EDOT > +1.4 DEG AND EDOT IS GREATER THAN -1.30 DEG/SEC, SET JET TIME NEGATIVE
064673,000056: # AND CONTINUE. OTHERWISE,SET JET FIRING TIME TO ZERO AND CONTINUE.
064674,000057:
064675,000058: # 5. INHIBITION LOGIC
064676,000059:
064677,000060: # IF OLDSENSE IS NON-ZERO:
064678,000061: # A) RETURN IF JET TIME HAS SAME SIGN AS OLDSENSE
064679,000062: # B) SET INHIBITION COUNTER*AND RETURN IF JET TIME IS ZERO
064680,000063: # C) SET INHIBITION COUNTER,*SET JET TIME TO ZERO AND RETURN IF SIGN
064681,000064: # OF JET TIME IS OPPOSITE TO THAT OF OLDSENSE
064682,000065:
064683,000066: # IF OLDSENSE IS ZERO:
064684,000067: # A) RETURN IF INHIBITION COUNTER IS NOT POSITIVE
064685,000068: # B) SET JET TIME TO ZERO AND RETURN IF INHIBITION COUNTER IS POSITIVE
064686,000069: # *NOTE: INHIBITION COUNTERS CAN BE SET TO 4 OR 10 FOR THE P,AND UV AXES,
064687,000070: # RESPECTIVELY,IN SPSRCS. THEY ARE DECREMENTED BY ONE AT THE BEGINNING OF
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Page 1496
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064689,000072: # EACH DAP PASS.
064690,000073:
064691,000074: # THE MINIMUM PULSE WIDTH OF THIS CONTROLLER IS DETERMINED BY THE REPETITION RATE AT WHICH THIS ROUTINE IS CALLED
064692,000075: # AND IS NOMINALLY 100 MS FOR ALL AXES IN DRIFTING FLIGHT. DURING POWERED FLIGHT THE MINIMUM IS 100 MS FOR THE
064693,000076: # P AXIS AND 200 MS FOR THE CONTROL OF THE U AND V AXES.
064694,000077:
064695,000078: # CALLING SEQUENCE:
064696,000079:
064697,000080: # INHINT
064698,000081: # TC IBNKCALL
064699,000082: # CADR SPSRCS
064700,000083:
064701,000084:
064702,000085: # EXIT:
064703,000086: # TC Q
064704,000087: # ALARM/ABORT MODE: NONE
064705,000088:
064706,000089: # SUBROUTINES CALLED: NONE
064707,000090:
064708,000091: # INPUT: E,EDOT
064709,000092: # TJP, TJV, TJU TJ MUST NOT BE NEGATIVE ZERO
064710,000093:
064711,000094: # OUTPUT: TJP, TJV, TJU
064712,000095:
064713,000096:
064714,000097: 21,3640 BANK 21
064715,000098: 21,2000 SETLOC DAPS4
064716,000099: 21,2000 BANK
064717,000100:
064718,000101: 21,3640 COUNT* $$/DAPBU
064719,000102:
064720,000103: 21,3640 E6,1525 EBANK= TJU
064721,000104: 21,3640 00632 RATELIM2 OCT 00632 # 1.125 DEG/SEC
064722,000105: 21,3641 34736 POSTHRST CA HALF
064723,000106:
064724,000107: 21,3642 51505 NDX AXISCTR
064725,000108: 21,3643 55525 TS TJU
064726,000109: 21,3644 11744 CCS OLDSENSE
064727,000110: 21,3645 13665 TCF POSCHECK # JETS FIRING POSITIVELY
064728,000111: 21,3646 13670 TCF CTRCHECK # JETS OFF. CHECK INHIBITION CTR
064729,000112: 21,3647 51505 NEGCHECK INDEX AXISCTR # JETS FIRING NEGATIVELY
064730,000113: 21,3650 41525 CS TJU
064731,000114: 21,3651 10000 CCS A
064732,000115: 21,3652 00002 TC Q # RETURN
064733,000116: 21,3653 13655 TCF +2
064734,000117: 21,3654 13655 TCF +1 # JETS COMMANDED OFF.SET CTR AND RETURN
064735,000118: 21,3655 51505 SETCTR INDEX AXISCTR # JET FIRING REVERSAL COMMANDED. SET CTR,
064736,000119: 21,3656 33677 CA UTIME # SET JET TIME TO ZERO,AND RETURN
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Page 1497
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064738,000121: 21,3657 51505 INDEX AXISCTR
064739,000122: 21,3660 55767 TS UJETCTR
064740,000123: 21,3661 34755 ZAPTJ CA ZERO
064741,000124: 21,3662 51505 INDEX AXISCTR
064742,000125: 21,3663 55525 TS TJU
064743,000126: 21,3664 00002 TC Q
064744,000127: 21,3665 51505 POSCHECK INDEX AXISCTR
064745,000128: 21,3666 31525 CA TJU
064746,000129: 21,3667 13651 TCF NEGCHECK +2
064747,000130: 21,3670 51505 CTRCHECK INDEX AXISCTR # CHECK JET INHIBITION COUNTER
064748,000131: 21,3671 11767 CCS UJETCTR
064749,000132: 21,3672 13674 TCF +2
064750,000133: 21,3673 00002 TC Q # CTR IS NOT POSITIVE. RETURN
064751,000134: 21,3674 13661 TCF ZAPTJ # CTR IS POSITIVE.INHIBIT FIRINGS
064752,000135: 21,3675 00002 TC Q # CTR IS NOT POSITIVE.RETURN
064753,000136: 21,3676 00004 OCT 00004
064754,000137: 21,3677 00012 UTIME OCT 00012
064755,000138: 21,3700 00012 OCT 00012
064756,000139: 21,3701 E6,1744 OLDSENSE EQUALS DAPTREG1
064757,000140: 21,3701 44753 NEGFIRE CS ONE # JETS FIRING NEGATIVELY
064758,000141: 21,3702 55744 TS OLDSENSE
064759,000142: 21,3703 31427 CA EDOT
064760,000143: 21,3704 13710 TCF +4
064761,000144: 21,3705 34753 PLUSFIRE CA ONE
064762,000145: 21,3706 55744 TS OLDSENSE
064763,000146: 21,3707 41427 CS EDOT # RATE DEAD BAND TEST
064764,000147: 21,3710 22000 LXCH A
064765,000148: 21,3711 40111 CS DAPBOOLS # IF DRIFTBIT = 1, USE ZERO TARGET RATE
064766,000149: 21,3712 74744 MASK DRIFTBIT # IF DRIFTBIT = 0, USE 0.10 RATE TARGET
064767,000150: 21,3713 10000 CCS A
064768,000151: 21,3714 34767 CA RATEDB1
064769,000152: 21,3715 60001 AD L
064770,000153: 21,3716 00006 EXTEND
064771,000154: 21,3717 63727 BZMF SPSSTART
064772,000155: 21,3720 13644 TCF POSTHRST +3
064773,000156:
064774,000157: 21,3721 51505 SPSRCS INDEX AXISCTR # JET SENSE TEST
064775,000158: 21,3722 11525 CCS TJU
064776,000159: 21,3723 13705 TCF PLUSFIRE # JETS FIRING POSITIVELY
064777,000160: 21,3724 13726 TCF +2
064778,000161: 21,3725 13701 TCF NEGFIRE # JETS FIRING NEGATIVELY
064779,000162: 21,3726 55744 TS OLDSENSE # JETS OFF
064780,000163: 21,3727 31427 SPSSTART CA EDOT # OUTER RATE LIMIT TEST
064781,000164: 21,3730 00006 EXTEND
064782,000165: 21,3731 74766 MP RATELIM1
064783,000166: 21,3732 10000 CCS A
064784,000167: 21,3733 13752 TCF NEGTHRST # OUTER RATE LIMIT EXCEEDED
064785,000168: 21,3734 13736 TCF +2
064786,000169: 21,3735 13641 TCF POSTHRST # OUTER RATE LIMIT EXCEEDED
064787,000170: 21,3736 31427 CA EDOT # COAST ZONE TEST
064788,000171: 21,3737 61751 AD E
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Page 1498
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064790,000173: 21,3740 00006 EXTEND
064791,000174: 21,3741 71411 MP DKDB # PAD LOADED DEADBAND. FRESHSTART: 1.4 DEG
064792,000175: 21,3742 00006 EXTEND
064793,000176: 21,3743 13760 BZF TJZERO
064794,000177:
064795,000178: 21,3744 00006 EXTEND
064796,000179: 21,3745 63754 BZMF +7
064797,000180: 21,3746 31427 CA EDOT
064798,000181: 21,3747 63640 AD RATELIM2
064799,000182: 21,3750 00006 EXTEND
064800,000183: 21,3751 63760 BZMF TJZERO
064801,000184: 21,3752 44736 NEGTHRST CS HALF
064802,000185: 21,3753 13642 TCF POSTHRST +1
064803,000186: 21,3754 43640 +7 CS RATELIM2
064804,000187: 21,3755 61427 AD EDOT
064805,000188: 21,3756 00006 EXTEND
064806,000189: 21,3757 63641 BZMF POSTHRST
064807,000190: 21,3760 34755 TJZERO CA ZERO
064808,000191: 21,3761 13642 TCF POSTHRST +1
064809,000192:
064810,000193:
064811,000194: 21,3762 4766 RATELIM1 = CALLCODE # = 00032, CORRESPONDING TO 1.73 DEG/SEC
064812,000195: 21,3762 4767 RATEDB1 = TBUILDFX # = 00045, CORRESPONDS TO 0.101 DEG/SEC
End of include-file SPS_BACK-UP_RCS_CONTROL.agc. Parent file is MAIN.agc