Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
original release 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 memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
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 97 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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029623,000002: ## Copyright: Public domain.
029624,000003: ## Filename: R31.agc
029625,000004: ## Purpose: A section of Luminary revision 97.
029626,000005: ## It is part of the reconstructed source code for the
029627,000006: ## original release of the flight software for the Lunar
029628,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029629,000008: ## The code has been recreated from a copy of Luminary 99
029630,000009: ## revision 001, using asterisks indicating changed lines in
029631,000010: ## the listing and Luminary Memos #83 and #85, which list
029632,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
029633,000012: ## code has been adapted such that the resulting bugger words
029634,000013: ## exactly match those specified for Luminary 97 in NASA drawing
029635,000014: ## 2021152D, which gives relatively high confidence that the
029636,000015: ## reconstruction is correct.
029637,000016: ## Reference: pp. 703-708
029638,000017: ## Assembler: yaYUL
029639,000018: ## Contact: Ron Burkey <info@sandroid.org>.
029640,000019: ## Website: www.ibiblio.org/apollo/index.html
029641,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
029642,000021:
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Page 703
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029644,000023: 40,3674 BANK 40
029645,000024: 40,2000 SETLOC R31LOC
029646,000025: 40,2000 BANK
029647,000026:
029648,000027: 40,3674 COUNT* $$/R31
029649,000028:
029650,000029: 40,3674 35015 R31CALL CAF PRIO3
029651,000030: 40,3675 05105 TC FINDVAC
029652,000031: 40,3676 E7,1470 EBANK= SUBEXIT
029653,000032: 40,3676 03121 76067 2CADR V83CALL
029654,000033:
029655,000034: 40,3700 05221 DSPDELAY TC FIXDELAY
029656,000035: 40,3701 00144 DEC 100 B-14
029657,000036: 40,3702 31044 CA EXTVBACT
029658,000037: 40,3703 74740 MASK BIT12
029659,000038: 40,3704 00006 EXTEND
029660,000039: 40,3705 13700 BZF DSPDELAY
029661,000040:
029662,000041: 40,3706 35017 CAF PRIO5
029663,000042: 40,3707 05072 TC NOVAC
029664,000043: 40,3710 E7,1611 EBANK= TSTRT
029665,000044: 40,3710 03113 76067 2CADR DISPN5X
029666,000045:
029667,000046: 40,3712 15261 TCF TASKOVER
029668,000047:
029669,000048: 37,3113 BANK 37
029670,000049: 37,2000 SETLOC R31
029671,000050: 37,2000 BANK
029672,000051: 37,3113 COUNT* $$/R31
029673,000052:
029674,000053: 37,3113 33407 DISPN5X CAF V16N54
029675,000054: 37,3114 04616 TC BANKCALL
029676,000055: 37,3115 20334 CADR GOMARKF
029677,000056: 37,3116 05563 TC B5OFF
029678,000057: 37,3117 05563 TC B5OFF
029679,000058: 37,3120 13113 TCF DISPN5X
029680,000059:
029681,000060: 37,3121 40103 V83CALL CS FLAGWRD7 # TEST AVERAGE G FLAG
029682,000061: 37,3122 74747 MASK AVEGFBIT
029683,000062: 37,3123 00006 EXTEND
029684,000063: 37,3124 13377 BZF MUNG? # ON - TEST MUNFLAG
029685,000064:
029686,000065: 37,3125 40104 CS FLAGWRD8
029687,000066: 37,3126 74744 MASK SURFFBIT
029688,000067: 37,3127 00006 EXTEND
029689,000068: 37,3130 13403 BZF ONEBASE # ON SURFACE - BYPASS LEMPREC
029690,000069:
029691,000070: 37,3131 06037 TC INTPRET # EXTRAPOLATE BOTH STATE VECTORS
029692,000071: 37,3132 77634 RTB
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Page 704
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029694,000073: 37,3133 21573 LOADTIME
029695,000074: 37,3134 34041 STCALL TDEC1
029696,000075: 37,3135 27057 LEMPREC # PRECISION BASE VECTOR FOR LM
029697,000076: 37,3136 77775 VLOAD
029698,000077: 37,3137 00017 RATT1
029699,000078: 37,3140 26170 STOVL BASETHP
029700,000079: 37,3141 00025 VATT1
029701,000080: 37,3142 16105 STODL BASETHV
029702,000081: 37,3143 00015 TAT
029703,000082: 37,3144 02114 DOCMBASE STORE BASETIME # PRECISION BASE VECTOR FOR CM
029704,000083: 37,3145 34041 STCALL TDEC1
029705,000084: 37,3146 27043 CSMPREC
029706,000085: 37,3147 77775 VLOAD
029707,000086: 37,3150 00017 RATT1
029708,000087: 37,3151 26140 STOVL BASEOTP
029709,000088: 37,3152 00025 VATT1
029710,000089: 37,3153 02120 STORE BASEOTV
029711,000090: 37,3154 77776 EXIT
029712,000091:
029713,000092: 37,3155 40103 REV83 CS FLAGWRD7
029714,000093: 37,3156 74747 MASK AVEGFBIT
029715,000094: 37,3157 00006 EXTEND
029716,000095: 37,3160 13326 BZF GETRVN # IF AVEGFLAG SET, USE RN,VN
029717,000096:
029718,000097: 37,3161 40104 CS FLAGWRD8
029719,000098: 37,3162 74744 MASK SURFFBIT
029720,000099: 37,3163 00006 EXTEND
029721,000100: 37,3164 13370 BZF R31SURF # IF ON SURFACE, USE LEMAREC
029722,000101:
029723,000102: 37,3165 06037 TC INTPRET # DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
029724,000103: 37,3166 77634 RTB
029725,000104: 37,3167 21573 LOADTIME
029726,000105: 37,3170 34041 STCALL TDEC1
029727,000106: 37,3171 27414 INTSTALL
029728,000107: 37,3172 43175 VLOAD CLEAR
029729,000108: 37,3173 02170 BASETHP
029730,000109: 37,3174 00263 MOONFLAG
029731,000110: 37,3175 25535 STOVL RCV
029732,000111: 37,3176 02105 BASETHV
029733,000112: 37,3177 15543 STODL VCV
029734,000113: 37,3200 02114 BASETIME
029735,000114: 37,3201 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
029736,000115: 37,3202 04344 MOONTHIS
029737,000116: 37,3203 77205 +2
029738,000117: 37,3204 00063 MOONFLAG
029739,000118: 37,3205 77614 SET
029740,000119: 37,3206 01473 INTYPFLG # CONIC EXTRAP.
029741,000120: 37,3207 35517 STCALL TET
029742,000121: 37,3210 27107 INTEGRVS # INTEGRATION --- AT LAST ---
029743,000122: 37,3211 77775 OTHCONIC VLOAD
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Page 705
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029745,000124: 37,3212 00001 RATT
029746,000125: 37,3213 26207 STOVL RONE
029747,000126: 37,3214 00007 VATT
029748,000127: 37,3215 36215 STCALL VONE # GET SET FOR CONIC EXTRAP., OTHER.
029749,000128: 37,3216 27414 INTSTALL
029750,000129: 37,3217 71214 SET DLOAD
029751,000130: 37,3220 01473 INTYPFLG
029752,000131: 37,3221 00015 TAT
029753,000132: 37,3222 00041 OTHINT STORE TDEC1
029754,000133: 37,3223 43175 VLOAD CLEAR
029755,000134: 37,3224 02140 BASEOTP
029756,000135: 37,3225 00263 MOONFLAG
029757,000136: 37,3226 25535 STOVL RCV
029758,000137: 37,3227 02120 BASEOTV
029759,000138: 37,3230 15543 STODL VCV
029760,000139: 37,3231 02114 BASETIME
029761,000140: 37,3232 43014 BOF SET
029762,000141: 37,3233 04344 MOONTHIS
029763,000142: 37,3234 77236 +2
029764,000143: 37,3235 00063 MOONFLAG
029765,000144: 37,3236 35517 STCALL TET
029766,000145: 37,3237 27107 INTEGRVS
029767,000146: 37,3240 52375 COMPDISP VLOAD VSU
029768,000147: 37,3241 00001 RATT
029769,000148: 37,3242 02207 RONE
029770,000149: 37,3243 65234 RTB PDDL
029771,000150: 37,3244 21724 NORMUNX1 # UNIT(RANGE) TO PD 0-5
029772,000151: 37,3245 00045 36D
029773,000152: 37,3246 77657 SL* # RESCALE AFTER NORMUNIT
029774,000153: 37,3247 20201 0,1
029775,000154: 37,3250 26201 STOVL RANGE # SCALED 2(29)M
029776,000155: 37,3251 00007 VATT
029777,000156: 37,3252 50251 VSU DOT # (VCM-VLM).UNIT(LOS), PD=0
029778,000157: 37,3253 02215 VONE
029779,000158: 37,3254 77752 SL1 # SCALED 2(7)M/CS
029780,000159: 37,3255 26203 STOVL RRATE
029781,000160: 37,3256 02207 RONE
029782,000161: 37,3257 63256 UNIT PDVL # UNIT(R) TO PD 0-5
029783,000162: 37,3260 06514 UNITZ
029784,000163: 37,3261 77624 CALL
029785,000164: 37,3262 47661 CDU*NBSM
029786,000165: 37,3263 41505 VXM PUSH # UNIT(Z)/4 TO PD 6-11
029787,000166: 37,3264 01734 REFSMMAT
029788,000167: 37,3265 72431 VPROJ VSL2 # UNIT(P)=UNIT(UZ-(UZ)PROJ(UR))
029789,000168: 37,3266 00001 0D
029790,000169: 37,3267 53445 BVSU UNIT
029791,000170: 37,3270 00007 6D
029792,000171: 37,3271 47315 PDVL VXV # UNIT(P) TO PD 12-17
029793,000172: 37,3272 00001 0D # UNIT(RL)
029794,000173: 37,3273 02215 VONE
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Page 706
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029796,000175: 37,3274 50235 VXV DOT # (UR * VL) * UR . U(P)
029797,000176: 37,3275 00001 0D
029798,000177: 37,3276 00015 12D
029799,000178: 37,3277 77715 PDVL # SIGN TO 12-13, LOAD U(P)
029800,000179: 37,3300 75241 DOT SIGN
029801,000180: 37,3301 00007 6D
029802,000181: 37,3302 00015 12D
029803,000182: 37,3303 65512 SL2 ACOS # ARCCOS(UP.UZ(SIGN))
029804,000183: 37,3304 26205 STOVL RTHETA
029805,000184: 37,3305 00001 0D
029806,000185: 37,3306 51041 DOT BPL # IF UR.UZ NEG,
029807,000186: 37,3307 00007 6D # RTHETA = 1 - RTHETA
029808,000187: 37,3310 77315 +5
029809,000188: 37,3311 45345 DLOAD DSU
029810,000189: 37,3312 06530 DPPOSMAX
029811,000190: 37,3313 02205 RTHETA
029812,000191: 37,3314 02205 STORE RTHETA
029813,000192: 37,3315 77776 EXIT
029814,000193:
029815,000194: 37,3316 34747 CA BIT5
029816,000195: 37,3317 71044 MASK EXTVBACT
029817,000196: 37,3320 00006 EXTEND # IF ANSWERED,
029818,000197: 37,3321 15472 BZF ENDEXT # TERMINATE
029819,000198:
029820,000199: 37,3322 41044 CS EXTVBACT
029821,000200: 37,3323 74740 MASK BIT12
029822,000201: 37,3324 27044 ADS EXTVBACT # SET BIT 12
029823,000202: 37,3325 13155 TCF REV83 # AND START AGAIN.
029824,000203:
029825,000204: 37,3326 37710 GETRVN CA PRIO22 # INHIBIT SERVICER
029826,000205: 37,3327 05146 TC PRIOCHNG
029827,000206: 37,3330 06037 TC INTPRET
029828,000207: 37,3331 40375 VLOAD SETPD
029829,000208: 37,3332 01221 RN # LM STATE VECTOR IN RN,VN
029830,000209: 37,3333 00001 0
029831,000210: 37,3334 26207 STOVL RONE
029832,000211: 37,3335 01227 VN
029833,000212: 37,3336 26215 STOVL VONE # LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
029834,000213: 37,3337 01726 V(CSM) # (TO INSURE TIME COMPATABILITY)
029835,000214: 37,3340 65315 PDVL PDDL
029836,000215: 37,3341 01720 R(CSM)
029837,000216: 37,3342 01235 PIPTIME
029838,000217: 37,3343 77776 EXIT
029839,000218: 37,3344 35015 CA PRIO3
029840,000219: 37,3345 05146 TC PRIOCHNG
029841,000220: 37,3346 06037 TC INTPRET
029842,000221: 37,3347 77214 BOFF VLOAD
029843,000222: 37,3350 03347 MUNFLAG
029844,000223: 37,3351 77363 GETRVN2 # IF MUNFLAG RESET, DO CM DELTA PRECISION
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Page 707
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029846,000225: 37,3352 60505 VXM VSR4 # CHANGE TO REFERENCE SYSTEM AND RESCALE
029847,000226: 37,3353 01734 REFSMMAT
029848,000227: 37,3354 77715 PDVL # R TO PD 0-5
029849,000228: 37,3355 76505 VXM VSL1
029850,000229: 37,3356 01734 REFSMMAT
029851,000230: 37,3357 40206 PUSH SETPD # V TO PD 5-11
029852,000231: 37,3360 00001 0
029853,000232: 37,3361 77650 GOTO
029854,000233: 37,3362 77240 COMPDISP
029855,000234:
029856,000235: 37,3363 77624 GETRVN2 CALL
029857,000236: 37,3364 27414 INTSTALL
029858,000237: 37,3365 52014 CLEAR GOTO
029859,000238: 37,3366 01673 INTYPFLG # PREC EXTRAP FOR OTHER
029860,000239: 37,3367 77222 OTHINT
029861,000240: 37,3370 06037 R31SURF TC INTPRET
029862,000241: 37,3371 77634 RTB # LM IS ON SURFACE, SO PRECISION
029863,000242: 37,3372 21573 LOADTIME # INTEGRATION USES PLANETARY INERTIAL
029864,000243: 37,3373 34041 STCALL TDEC1 # ORIENTATION SUBROUTINE
029865,000244: 37,3374 27057 LEMPREC
029866,000245: 37,3375 77650 GOTO # DO CSM CONIC
029867,000246: 37,3376 77211 OTHCONIC
029868,000247: 37,3377 40102 MUNG? CS FLAGWRD6
029869,000248: 37,3400 74744 MASK MUNFLBIT
029870,000249: 37,3401 00006 EXTEND
029871,000250: 37,3402 13326 BZF GETRVN # IF MUNFLAG SET, CSM BASE NOT NEEDED
029872,000251:
029873,000252: 37,3403 06037 ONEBASE TC INTPRET # GET CSM BASE VECTOR
029874,000253: 37,3404 52034 RTB GOTO
029875,000254: 37,3405 21573 LOADTIME
029876,000255: 37,3406 77144 DOCMBASE
029877,000256:
029878,000257: 37,3407 04066 V16N54 VN 1654
029879,000258:
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Page 708
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029882,000261:
End of include-file R31.agc. Parent file is MAIN.agc