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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033444,000002: ## Copyright: Public domain.
033445,000003: ## Filename: THE_LUNAR_LANDING.agc
033446,000004: ## Purpose: A section of Luminary revision 173.
033447,000005: ## It is part of the reconstructed source code for the second
033448,000006: ## (unflown) release of the flight software for the Lunar
033449,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
033450,000008: ## The code has been recreated from a reconstructed copy of
033451,000009: ## Luminary 178, as well as Luminary memo 167 (revision 1).
033452,000010: ## It has been adapted such that the resulting bugger words
033453,000011: ## exactly match those specified for Luminary 173 in NASA
033454,000012: ## drawing 2021152N, which gives relatively high confidence
033455,000013: ## that the reconstruction is correct.
033456,000014: ## Reference: pp. 771-778
033457,000015: ## Assembler: yaYUL
033458,000016: ## Contact: Ron Burkey <info@sandroid.org>.
033459,000017: ## Website: www.ibiblio.org/apollo/index.html
033460,000018: ## Mod history: 2019-09-18 MAS Created from Luminary 178.
033461,000019:
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Page 771
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033463,000021: 32,2562 BANK 32
033464,000022: 32,2000 SETLOC F2DPS*32
033465,000023: 32,2000 BANK
033466,000024:
033467,000025: 32,2562 E7,1621 EBANK= E2DPS
033468,000026:
033469,000027: # ****************************************
033470,000028: # P63: THE LUNAR LANDING, BRAKING PHASE
033471,000029: # ****************************************
033472,000030:
033473,000031: 32,2562 COUNT* $$/P63
033474,000032:
033475,000033: 32,2562 05364 P63LM TC PHASCHNG
033476,000034: 32,2563 04024 OCT 04024
033477,000035:
033478,000036: 32,2564 04616 TC BANKCALL # DO IMU STATUS CHECK ROUTINE R02
033479,000037: 32,2565 11241 CADR R02BOTH
033480,000038:
033481,000039: 32,2566 33056 CAF P63ADRES # INITIALIZE WHICH FOR BURNBABY
033482,000040: 32,2567 55455 TS WHICH
033483,000041:
033484,000042: 32,2570 32000 CAF DPSTHRSH # INITIALIZE DVMON
033485,000043: 32,2571 55250 TS DVTHRUSH
033486,000044: 32,2572 34751 CAF FOUR
033487,000045: 32,2573 55515 TS DVCNTR
033488,000046:
033489,000047: 32,2574 44753 CS ONE # INITIALIZE WCHPHASE AND FLPASSO
033490,000048: 32,2575 55346 TS WCHPHASE
033491,000049:
033492,000050: 32,2576 34755 CA ZERO
033493,000051: 32,2577 55623 TS FLPASS0
033494,000052:
033495,000053: 32,2600 44736 CS BIT14
033496,000054: 32,2601 00006 EXTEND
033497,000055: 32,2602 03012 WAND CHAN12 # REMOVE TRACK-ENABLE DISCRETE.
033498,000056:
033499,000057: 32,2603 06042 FLAGORGY TC INTPRET # DIONYSIAN FLAG WAVING
033500,000058: 32,2604 77614 CLEAR
033501,000059: 32,2605 00664 NOTERFLG # PERMIT TERRAIN MODEL
033502,000060: 32,2606 43014 CLEAR CLEAR
033503,000061: 32,2607 02663 NOTHROTL
033504,000062: 32,2610 03271 REDFLAG
033505,000063: 32,2611 43014 CLEAR SET
033506,000064: 32,2612 05660 LRBYPASS
033507,000065: 32,2613 03067 MUNFLAG
033508,000066: 32,2614 43014 CLEAR CLEAR
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Page 772
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033510,000068: 32,2615 00266 P25FLAG # TERMINATE P25 IF IT IS RUNNING.
033511,000069: 32,2616 00270 RNDVZFLG # TERMINATE P20 IF IT IS RUNNING
033512,000070:
033513,000071: # ****************************************
033514,000072:
033515,000073: 32,2617 77201 IGNALG SETPD VLOAD # FIRST SET UP INPUTS FOR RP-TO-R:-
033516,000074: 32,2620 00001 0 # AT 0D LANDING SITE IN MOON FIXED FRAME
033517,000075: 32,2621 02021 RLS # AT 6D ESTIMATED TIME OF LANDING
033518,000076: 32,2622 41525 PDDL PUSH # MPAC NON-ZERO TO INDICATE LUNAR CASE
033519,000077: 32,2623 02027 TLAND
033520,000078: 32,2624 37625 STCALL TPIP # ALSO SET TPIP FOR FIRST GUIDANCE PASS
033521,000079: 32,2625 55720 RP-TO-R
033522,000080: 32,2626 64312 VSL4 MXV
033523,000081: 32,2627 01732 REFSMMAT
033524,000082: 32,2630 37635 STCALL LAND
033525,000083: 32,2631 71346 GUIDINIT # GUIDINIT INITIALIZES WM AND /LAND/
033526,000084: 32,2632 45345 DLOAD DSU
033527,000085: 32,2633 02027 TLAND
033528,000086: 32,2634 25063 GUIDDURN
033529,000087: 32,2635 34041 STCALL TDEC1 # INTEGRATE STATE FORWARD TO THAT TIME
033530,000088: 32,2636 27056 LEMPREC
033531,000089: 32,2637 77331 SSP VLOAD
033532,000090: 32,2640 03647 NIGNLOOP
033533,000091: 32,2641 00050 40D
033534,000092: 32,2642 06516 UNITX
033535,000093: 32,2643 26572 STOVL CG
033536,000094: 32,2644 06514 UNITY
033537,000095: 32,2645 26600 STOVL CG +6
033538,000096: 32,2646 06512 UNITZ
033539,000097: 32,2647 16606 STODL CG +14
033540,000098: 32,2650 25061 99999CON
033541,000099: 32,2651 27665 STOVL DELTAH # INITIALIZE DELTAH FOR V16N68 DISPLAY
033542,000100: 32,2652 06520 ZEROVECS
033543,000101: 32,2653 17253 STODL UNFC/2 # INITIALIZE TRIM VELOCITY CORRECTION TERM
033544,000102: 32,2654 06520 HI6ZEROS
033545,000103: 32,2655 17643 STODL TTF/8
033546,000104: 32,2656 25067 HLROFFF
033547,000105: 32,2657 03452 STORE HLROFF # LR CUTOFF ALTITUDE.
033548,000106:
033549,000107: 32,2660 77745 IGNALOOP DLOAD
033550,000108: 32,2661 00015 TAT
033551,000109: 32,2662 27561 STOVL PIPTIME1
033552,000110: 32,2663 00017 RATT1
033553,000111: 32,2664 64312 VSL4 MXV
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REFSMMAT below is circled in blue pen.
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033555,000113: 32,2665 01732 REFSMMAT
033556,000114: 32,2666 37521 STCALL R
033557,000115: 32,2667 67000 MUNGRAV
033558,000116: 32,2670 35236 STCALL GDT/2
033559,000117: 32,2671 62417 ?GUIDSUB # WHICH DELIVERS N PASSES OF GUIDANCE
033560,000118:
033561,000119: # DDUMCALC IS PROGRAMMED AS FOLLOWS:-
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Page 773
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033563,000121: # 2 -
033564,000122: # (RIGNZ - RGU )/16 + 16(RGU )KIGNY/B8 + (RGU - RIGNX)KIGNX/B4 + (ABVAL(VGU) - VIGN)KIGNV/B4
033565,000123: # 2 1 0
033566,000124: # DDUM = -------------------------------------------------------------------------------------------
033567,000125: # 10
033568,000126: # 2 (VGU - 16 VGU KIGNX/B4)
033569,000127: # 2 0
033570,000128:
033571,000129: # THE NUMERATOR IS SCALED IN METERS AT 2(28). THE DENOMINATOR IS A VELOCITY IN UNITS OF 2(10)M/CS.
033572,000130: # THE QUOTIENT IS THUS A TIME IN UNITS OF 2(18) CENTISECONDS. THE FINAL SHIFT RESCALES TO UNITS OF 2(28) CS.
033573,000131: # THERE IS NO DAMPING FACTOR. THE CONSTANTS KIGNX/B4, KIGNY/B8 AND KIGNV/B4 ARE ALL NEGATIVE IN SIGN.
033574,000132:
033575,000133: 32,2672 55646 DDUMCALC TS NIGNLOOP
033576,000134: 32,2673 06042 TC INTPRET
033577,000135: 32,2674 57345 DLOAD DMPR # FORM DENOMINATOR FIRST
033578,000136: 32,2675 03627 VGU
033579,000137: 32,2676 02465 KIGNX/B4
033580,000138: 32,2677 44232 SL4R BDSU
033581,000139: 32,2700 03633 VGU +4
033582,000140: 32,2701 45325 PDDL DSU
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The value in the following line has a blue arrow drawn in pointing to it.
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033584,000142: 32,2702 02463 RIGNZ
033585,000143: 32,2703 02630 RGU +4
033586,000144: 32,2704 65222 SR4R PDDL
033587,000145: 32,2705 02626 RGU +2
033588,000146: 32,2706 57316 DSQ DMPR
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The value in the following line has a blue arrow drawn in pointing to it.
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033590,000148: 32,2707 02467 KIGNY/B8
033591,000149: 32,2710 65232 SL4R PDDL
033592,000150: 32,2711 02624 RGU
033593,000151: 32,2712 57225 DSU DMPR
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The values in the following two line have blue arrows drawn in pointing to them.
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033595,000153: 32,2713 02461 RIGNX
033596,000154: 32,2714 02465 KIGNX/B4
033597,000155: 32,2715 51515 PDVL ABVAL
033598,000156: 32,2716 03627 VGU
033599,000157: 32,2717 57225 DSU DMPR
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The values in the following two line have blue arrows drawn in pointing to them.
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033601,000159: 32,2720 02457 VIGN
033602,000160: 32,2721 02471 KIGNV/B4
033603,000161: 32,2722 43215 DAD DAD
033604,000162: 32,2723 56215 DAD DDV
033605,000163: 32,2724 77661 SRR
033606,000164: 32,2725 21613 10D
033607,000165:
033608,000166: 32,2726 43206 PUSH DAD
033609,000167: 32,2727 03561 PIPTIME1
033610,000168: 32,2730 14041 STODL TDEC1 # STORE NEW GUESS FOR NEXT INTEGRATION
033611,000169: 32,2731 45246 ABS DSU
033612,000170: 32,2732 25065 DDUMCRIT
033613,000171: 32,2733 45040 BMN CALL
033614,000172: 32,2734 64753 DDUMGOOD
033615,000173: 32,2735 27410 INTSTALL
033616,000174: 32,2736 43014 SET SET
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Page 774
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033618,000176: 32,2737 01473 INTYPFLG
033619,000177: 32,2740 00063 MOONFLAG
033620,000178: 32,2741 77745 DLOAD
033621,000179: 32,2742 03561 PIPTIME1
033622,000180: 32,2743 25517 STOVL TET # HOPEFULLY ?GUIDSUB DID NOT
033623,000181: 32,2744 00017 RATT1 # CLOBBER RATT1 AND VATT1
033624,000182: 32,2745 25535 STOVL RCV
033625,000183: 32,2746 00025 VATT1
033626,000184: 32,2747 35543 STCALL VCV
033627,000185: 32,2750 27106 INTEGRVS
033628,000186: 32,2751 77650 GOTO
033629,000187: 32,2752 64660 IGNALOOP
033630,000188:
033631,000189: 32,2753 54335 DDUMGOOD SLOAD SR
033632,000190: 32,2754 03423 ZOOMTIME
033633,000191: 32,2755 20617 14D
033634,000192: 32,2756 77621 BDSU
033635,000193: 32,2757 00041 TDEC1
033636,000194: 32,2760 27442 STOVL TIG # COMPUTE DISTANCE LANDING SITE WILL BE
033637,000195: 32,2761 03527 V # OUT OF LM'S ORBITAL PLANE AT IGNITION:
033638,000196: 32,2762 53435 VXV UNIT # SIGN IS + IF LANDING SITE IS TO THE
033639,000197: 32,2763 03521 R # RIGHT, NORTH; - IF TO THE LEFT, SOUTH.
033640,000198: 32,2764 72441 DOT SL1
033641,000199: 32,2765 03635 LAND
033642,000200: 32,2766 26614 R60INIT STOVL OUTOFPLN # INITIALIZATION FOR CALCMANU
033643,000201: 32,2767 03253 UNFC/2
033644,000202: 32,2770 02616 STORE R60VSAVE # STORE UNFC/2 TEMPORARILY IN R60SAVE
033645,000203: 32,2771 77776 EXIT
033646,000204: # ****************************************
033647,000205:
033648,000206: 32,2772 05364 IGNALGRT TC PHASCHNG # PREVENT REPEATING IGNALG
033649,000207: 32,2773 04024 OCT 04024
033650,000208:
033651,000209: 32,2774 44362 ASTNCLOK CS ASTNDEX
033652,000210: 32,2775 04616 TC BANKCALL
033653,000211: 32,2776 74671 CADR STCLOK2
033654,000212: 32,2777 15155 TCF ENDOFJOB # RETURN IN NEW JOB AND IN EBANK FIVE
033655,000213:
033656,000214: 32,3000 06042 ASTNRET TC INTPRET
033657,000215: 32,3001 47131 SSP RTB # GO PICK UP DISPLAY AT END OF R51:
033658,000216: 32,3002 02747 QMAJ # "PROCEED" WILL DO A FINE ALIGNMENT
033659,000217: 32,3003 65005 FCADR P63SPOT2 # "ENTER" WILL RETURN TO P63SPOT2
033660,000218: 32,3004 31127 R51P63
033661,000219: 32,3005 53575 P63SPOT2 VLOAD UNIT # INITIALIZE KALCMANU FOR BURN ATTITUDE
033662,000220: 32,3006 02616 R60VSAVE
033663,000221: 32,3007 27773 STOVL POINTVSM
033664,000222: 32,3010 06516 UNITX
033665,000223: 32,3011 03765 STORE SCAXIS
033666,000224: 32,3012 77776 EXIT
033667,000225:
033668,000226: 32,3013 35016 CAF EBANK7
033669,000227: 32,3014 54003 TS EBANK
033670,000228:
033671,000229: 32,3015 00004 INHINT
033672,000230: 32,3016 04674 TC IBNKCALL
033673,000231: 32,3017 40143 CADR PFLITEDB
033674,000232: 32,3020 00003 RELINT
033675,000233:
033676,000234: 32,3021 04616 TC BANKCALL
033677,000235: 32,3022 54125 CADR R60LEM
033678,000236:
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Page 775
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033680,000238: 32,3023 05364 TC PHASCHNG # PREVENT RECALLING R60
033681,000239: 32,3024 04024 OCT 04024
033682,000240:
033683,000241: 32,3025 34746 P63SPOT3 CA BIT6 # IS THE LR ANTENNA IN POSITION 1 YET
033684,000242: 32,3026 00006 EXTEND
033685,000243: 32,3027 02033 RAND CHAN33
033686,000244: 32,3030 00006 EXTEND
033687,000245: 32,3031 13037 BZF P63SPOT4 # BRANCH IF ANTENNA ALREADY IN POSITION 1
033688,000246:
033689,000247: 32,3032 33057 CAF CODE500 # ASTRONAUT: PLEASE CRANK THE
033690,000248: 32,3033 04616 TC BANKCALL # SILLY THING AROUND
033691,000249: 32,3034 20624 CADR GOPERF1
033692,000250: 32,3035 16001 TCF GOTOPOOH # TERMINATE
033693,000251: 32,3036 13025 TCF P63SPOT3 # PROCEED SEE IF HE'S LYING
033694,000252:
033695,000253: 32,3037 34752 P63SPOT4 CAF TWO # ENTER INITIALIZE LANDING RADAR
033696,000254: 32,3040 55674 TS STILBADH
033697,000255: 32,3041 55675 TS STILBADV
033698,000256: 32,3042 34755 CAF ZERO
033699,000257: 32,3043 55670 TS LRLCTR
033700,000258: 32,3044 55672 TS LRMCTR
033701,000259: 32,3045 55671 TS LRRCTR
033702,000260: 32,3046 55673 TS LRSCTR
033703,000261: 32,3047 55462 TS VSELECT
033704,000262:
033705,000263: 32,3050 34753 CAF ONE
033706,000264: 32,3051 55650 TS LRPOS
033707,000265:
033708,000266: 32,3052 34751 CA FOUR # INITIALIZE COUNTER TO ISSUE 511
033709,000267: 32,3053 55622 TS 511CTR # ALARM AFTER 10 SECONDS
033710,000268:
033711,000269: 32,3054 04635 TC POSTJUMP # OFF TO SEE THE WIZARD...
033712,000270: 32,3055 74130 CADR BURNBABY
033713,000271:
033714,000272:
033715,000273: # ----------------------------------------
033716,000274:
033717,000275: # CONSTANTS FOR P63LM AND IGNALG
033718,000276:
033719,000277:
033720,000278: 32,3056 02100 P63ADRES GENADR P63TABLE
033721,000279:
033722,000280:
033723,000281: 32,3057 4362 ASTNDEX = MD1 # OCT 25; INDEX FOR CLOKTASK
033724,000282:
033725,000283:
033726,000284: 32,3057 00500 CODE500 OCT 00500
033727,000285:
033728,000286:
033729,000287: 32,3060 00035 30373 99999CON 2DEC 30479.7 B-24
033730,000288:
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Page 776
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033732,000290: 32,3062 00004 01610 GUIDDURN 2DEC +66440 B-28 # GUIDDURN +6.64400314E+ 2
033733,000291:
033734,000292: 32,3064 00000 00010 DDUMCRIT 2DEC +8 B-28 # CRITERION FOR IGNALG CONVERGENCE
033735,000293:
033736,000294:
033737,000295:
033738,000296: 32,3066 00364 HLROFFF DEC 15.24 B-10 # LOADED DP, BUT LOW ORDER DOESN'T MATTER
033739,000297:
033740,000298:
033741,000299: # ----------------------------------------
033742,000300:
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Page 777
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033744,000302: # ****************************************
033745,000303: # P68: LANDING CONFIRMATION
033746,000304: # ****************************************
033747,000305:
033748,000306: 34,3271 BANK 34
033749,000307: 34,2000 SETLOC F2DPS*34
033750,000308: 34,2000 BANK
033751,000309:
033752,000310: 34,3271 COUNT* $$/P6567
033753,000311:
033754,000312: 34,3271 05364 LANDJUNK TC PHASCHNG
033755,000313: 34,3272 04024 OCT 04024
033756,000314:
033757,000315: 34,3273 00004 INHINT
033758,000316: 34,3274 04616 TC BANKCALL # ZERO ATTITUDE ERROR
033759,000317: 34,3275 40154 CADR ZATTEROR
033760,000318:
033761,000319: 34,3276 06042 TC INTPRET # TO INTERPRETIVE AS TIME IS NOT CRITICAL
033762,000320: 34,3277 77614 SET # PREVENT RCS JET FIRINGS IF MODE CONT IS
033763,000321: 34,3300 06460 PULSEFLG # IN ATT HOLD
033764,000322: 34,3301 43014 SET CLEAR
033765,000323: 34,3302 04067 SURFFLAG
033766,000324: 34,3303 04666 LETABORT
033767,000325: 34,3304 77214 SET VLOAD
033768,000326: 34,3305 05062 APSFLAG
033769,000327: 34,3306 01220 RN
033770,000328: 34,3307 16032 STODL ALPHAV
033771,000329: 34,3310 01234 PIPTIME
033772,000330: 34,3311 45014 SET CALL
033773,000331: 34,3312 01463 LUNAFLAG
033774,000332: 34,3313 26347 LAT-LONG
033775,000333: 34,3314 77201 SETPD VLOAD # COMPUTE RLS AND STORE IT AWAY
033776,000334: 34,3315 00001 0
033777,000335: 34,3316 01220 RN
033778,000336: 34,3317 65352 VSL2 PDDL
033779,000337: 34,3320 01234 PIPTIME
033780,000338: 34,3321 45006 PUSH CALL
033781,000339: 34,3322 51642 R-TO-RP
033782,000340: 34,3323 02021 STORE RLS
033783,000341: 34,3324 77776 EXIT
033784,000342: 34,3325 33345 CAF V06N43* # ASTRONAUT: NOW LOOK WHERE YOU ENDED UP
033785,000343: 34,3326 04616 TC BANKCALL
033786,000344: 34,3327 20477 CADR GOFLASH
033787,000345: 34,3330 16001 TCF GOTOPOOH # TERMINATE
033788,000346: 34,3331 13333 TCF +2 # PROCEED
033789,000347: 34,3332 13325 TCF -5 # RECYCLE
033790,000348:
033791,000349: 34,3333 06042 TC INTPRET
033792,000350: 34,3334 64375 VLOAD MXV # INITIALIZE GSAV AND (USING REFMF)
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Page 778
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033794,000352: 34,3335 01220 RN # YNBSAV, ZNBSAV AND ATTFLAG FOR P57
033795,000353: 34,3336 01732 REFSMMAT
033796,000354: 34,3337 45056 UNIT CALL
033797,000355: 34,3340 47653 CDU*SMNB
033798,000356: 34,3341 36231 STCALL GSAV
033799,000357: 34,3342 33502 REFMF
033800,000358: 34,3343 77776 EXIT
033801,000359:
033802,000360: 34,3344 16001 TCF GOTOPOOH # ASTRONAUT: PLEASE SELECT P57
033803,000361:
033804,000362:
033805,000363: 34,3345 01453 V06N43* VN 0643
End of include-file THE_LUNAR_LANDING.agc. Parent file is MAIN.agc