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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029481,000002: ## Copyright: Public domain.
029482,000003: ## Filename: R31.agc
029483,000004: ## Purpose: A section of Luminary revision 98.
029484,000005: ## It is part of the reconstructed source code for the a
029485,000006: ## development version of the flight software for the Lunar
029486,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029487,000008: ## The code has been recreated from a copy of Luminary 99
029488,000009: ## revision 001, using asterisks indicating changed lines in
029489,000010: ## the listing and Luminary Memo #85, which lists changes between
029490,000011: ## Luminary 98 and 99.
029491,000012: ## Reference: pp. 703-708
029492,000013: ## Assembler: yaYUL
029493,000014: ## Contact: Ron Burkey <info@sandroid.org>.
029494,000015: ## Website: www.ibiblio.org/apollo/index.html
029495,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
029496,000017:
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Page 703
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029498,000019: 40,3674 BANK 40
029499,000020: 40,2000 SETLOC R31LOC
029500,000021: 40,2000 BANK
029501,000022:
029502,000023: 40,3674 COUNT* $$/R31
029503,000024:
029504,000025: 40,3674 35015 R31CALL CAF PRIO3
029505,000026: 40,3675 05105 TC FINDVAC
029506,000027: 40,3676 E7,1470 EBANK= SUBEXIT
029507,000028: 40,3676 03121 76067 2CADR V83CALL
029508,000029:
029509,000030: 40,3700 05221 DSPDELAY TC FIXDELAY
029510,000031: 40,3701 00144 DEC 100 B-14
029511,000032: 40,3702 31044 CA EXTVBACT
029512,000033: 40,3703 74740 MASK BIT12
029513,000034: 40,3704 00006 EXTEND
029514,000035: 40,3705 13700 BZF DSPDELAY
029515,000036:
029516,000037: 40,3706 35017 CAF PRIO5
029517,000038: 40,3707 05072 TC NOVAC
029518,000039: 40,3710 E7,1611 EBANK= TSTRT
029519,000040: 40,3710 03113 76067 2CADR DISPN5X
029520,000041:
029521,000042: 40,3712 15261 TCF TASKOVER
029522,000043:
029523,000044: 37,3113 BANK 37
029524,000045: 37,2000 SETLOC R31
029525,000046: 37,2000 BANK
029526,000047: 37,3113 COUNT* $$/R31
029527,000048:
029528,000049: 37,3113 33407 DISPN5X CAF V16N54
029529,000050: 37,3114 04616 TC BANKCALL
029530,000051: 37,3115 20334 CADR GOMARKF
029531,000052: 37,3116 05563 TC B5OFF
029532,000053: 37,3117 05563 TC B5OFF
029533,000054: 37,3120 13113 TCF DISPN5X
029534,000055:
029535,000056: 37,3121 40103 V83CALL CS FLAGWRD7 # TEST AVERAGE G FLAG
029536,000057: 37,3122 74747 MASK AVEGFBIT
029537,000058: 37,3123 00006 EXTEND
029538,000059: 37,3124 13377 BZF MUNG? # ON - TEST MUNFLAG
029539,000060:
029540,000061: 37,3125 40104 CS FLAGWRD8
029541,000062: 37,3126 74744 MASK SURFFBIT
029542,000063: 37,3127 00006 EXTEND
029543,000064: 37,3130 13403 BZF ONEBASE # ON SURFACE - BYPASS LEMPREC
029544,000065:
029545,000066: 37,3131 06037 TC INTPRET # EXTRAPOLATE BOTH STATE VECTORS
029546,000067: 37,3132 77634 RTB
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Page 704
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029548,000069: 37,3133 21573 LOADTIME
029549,000070: 37,3134 34041 STCALL TDEC1
029550,000071: 37,3135 27057 LEMPREC # PRECISION BASE VECTOR FOR LM
029551,000072: 37,3136 77775 VLOAD
029552,000073: 37,3137 00017 RATT1
029553,000074: 37,3140 26170 STOVL BASETHP
029554,000075: 37,3141 00025 VATT1
029555,000076: 37,3142 16105 STODL BASETHV
029556,000077: 37,3143 00015 TAT
029557,000078: 37,3144 02114 DOCMBASE STORE BASETIME # PRECISION BASE VECTOR FOR CM
029558,000079: 37,3145 34041 STCALL TDEC1
029559,000080: 37,3146 27043 CSMPREC
029560,000081: 37,3147 77775 VLOAD
029561,000082: 37,3150 00017 RATT1
029562,000083: 37,3151 26140 STOVL BASEOTP
029563,000084: 37,3152 00025 VATT1
029564,000085: 37,3153 02120 STORE BASEOTV
029565,000086: 37,3154 77776 EXIT
029566,000087:
029567,000088: 37,3155 40103 REV83 CS FLAGWRD7
029568,000089: 37,3156 74747 MASK AVEGFBIT
029569,000090: 37,3157 00006 EXTEND
029570,000091: 37,3160 13326 BZF GETRVN # IF AVEGFLAG SET, USE RN,VN
029571,000092:
029572,000093: 37,3161 40104 CS FLAGWRD8
029573,000094: 37,3162 74744 MASK SURFFBIT
029574,000095: 37,3163 00006 EXTEND
029575,000096: 37,3164 13370 BZF R31SURF # IF ON SURFACE, USE LEMAREC
029576,000097:
029577,000098: 37,3165 06037 TC INTPRET # DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
029578,000099: 37,3166 77634 RTB
029579,000100: 37,3167 21573 LOADTIME
029580,000101: 37,3170 34041 STCALL TDEC1
029581,000102: 37,3171 27414 INTSTALL
029582,000103: 37,3172 43175 VLOAD CLEAR
029583,000104: 37,3173 02170 BASETHP
029584,000105: 37,3174 00263 MOONFLAG
029585,000106: 37,3175 25535 STOVL RCV
029586,000107: 37,3176 02105 BASETHV
029587,000108: 37,3177 15543 STODL VCV
029588,000109: 37,3200 02114 BASETIME
029589,000110: 37,3201 43014 BOF SET # GET APPROPRIATE MOONFLAG SETTING
029590,000111: 37,3202 04344 MOONTHIS
029591,000112: 37,3203 77205 +2
029592,000113: 37,3204 00063 MOONFLAG
029593,000114: 37,3205 77614 SET
029594,000115: 37,3206 01473 INTYPFLG # CONIC EXTRAP.
029595,000116: 37,3207 35517 STCALL TET
029596,000117: 37,3210 27107 INTEGRVS # INTEGRATION --- AT LAST ---
029597,000118: 37,3211 77775 OTHCONIC VLOAD
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Page 705
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029599,000120: 37,3212 00001 RATT
029600,000121: 37,3213 26207 STOVL RONE
029601,000122: 37,3214 00007 VATT
029602,000123: 37,3215 36215 STCALL VONE # GET SET FOR CONIC EXTRAP., OTHER.
029603,000124: 37,3216 27414 INTSTALL
029604,000125: 37,3217 71214 SET DLOAD
029605,000126: 37,3220 01473 INTYPFLG
029606,000127: 37,3221 00015 TAT
029607,000128: 37,3222 00041 OTHINT STORE TDEC1
029608,000129: 37,3223 43175 VLOAD CLEAR
029609,000130: 37,3224 02140 BASEOTP
029610,000131: 37,3225 00263 MOONFLAG
029611,000132: 37,3226 25535 STOVL RCV
029612,000133: 37,3227 02120 BASEOTV
029613,000134: 37,3230 15543 STODL VCV
029614,000135: 37,3231 02114 BASETIME
029615,000136: 37,3232 43014 BOF SET
029616,000137: 37,3233 04344 MOONTHIS
029617,000138: 37,3234 77236 +2
029618,000139: 37,3235 00063 MOONFLAG
029619,000140: 37,3236 35517 STCALL TET
029620,000141: 37,3237 27107 INTEGRVS
029621,000142: 37,3240 52375 COMPDISP VLOAD VSU
029622,000143: 37,3241 00001 RATT
029623,000144: 37,3242 02207 RONE
029624,000145: 37,3243 65234 RTB PDDL
029625,000146: 37,3244 21724 NORMUNX1 # UNIT(RANGE) TO PD 0-5
029626,000147: 37,3245 00045 36D
029627,000148: 37,3246 77657 SL* # RESCALE AFTER NORMUNIT
029628,000149: 37,3247 20201 0,1
029629,000150: 37,3250 26201 STOVL RANGE # SCALED 2(29)M
029630,000151: 37,3251 00007 VATT
029631,000152: 37,3252 50251 VSU DOT # (VCM-VLM).UNIT(LOS), PD=0
029632,000153: 37,3253 02215 VONE
029633,000154: 37,3254 77752 SL1 # SCALED 2(7)M/CS
029634,000155: 37,3255 26203 STOVL RRATE
029635,000156: 37,3256 02207 RONE
029636,000157: 37,3257 63256 UNIT PDVL # UNIT(R) TO PD 0-5
029637,000158: 37,3260 06514 UNITZ
029638,000159: 37,3261 77624 CALL
029639,000160: 37,3262 47661 CDU*NBSM
029640,000161: 37,3263 41505 VXM PUSH # UNIT(Z)/4 TO PD 6-11
029641,000162: 37,3264 01734 REFSMMAT
029642,000163: 37,3265 72431 VPROJ VSL2 # UNIT(P)=UNIT(UZ-(UZ)PROJ(UR))
029643,000164: 37,3266 00001 0D
029644,000165: 37,3267 53445 BVSU UNIT
029645,000166: 37,3270 00007 6D
029646,000167: 37,3271 47315 PDVL VXV # UNIT(P) TO PD 12-17
029647,000168: 37,3272 00001 0D # UNIT(RL)
029648,000169: 37,3273 02215 VONE
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Page 706
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029650,000171: 37,3274 50235 VXV DOT # (UR * VL) * UR . U(P)
029651,000172: 37,3275 00001 0D
029652,000173: 37,3276 00015 12D
029653,000174: 37,3277 77715 PDVL # SIGN TO 12-13, LOAD U(P)
029654,000175: 37,3300 75241 DOT SIGN
029655,000176: 37,3301 00007 6D
029656,000177: 37,3302 00015 12D
029657,000178: 37,3303 65512 SL2 ACOS # ARCCOS(UP.UZ(SIGN))
029658,000179: 37,3304 26205 STOVL RTHETA
029659,000180: 37,3305 00001 0D
029660,000181: 37,3306 51041 DOT BPL # IF UR.UZ NEG,
029661,000182: 37,3307 00007 6D # RTHETA = 1 - RTHETA
029662,000183: 37,3310 77315 +5
029663,000184: 37,3311 45345 DLOAD DSU
029664,000185: 37,3312 06530 DPPOSMAX
029665,000186: 37,3313 02205 RTHETA
029666,000187: 37,3314 02205 STORE RTHETA
029667,000188: 37,3315 77776 EXIT
029668,000189:
029669,000190: 37,3316 34747 CA BIT5
029670,000191: 37,3317 71044 MASK EXTVBACT
029671,000192: 37,3320 00006 EXTEND # IF ANSWERED,
029672,000193: 37,3321 15472 BZF ENDEXT # TERMINATE
029673,000194:
029674,000195: 37,3322 41044 CS EXTVBACT
029675,000196: 37,3323 74740 MASK BIT12
029676,000197: 37,3324 27044 ADS EXTVBACT # SET BIT 12
029677,000198: 37,3325 13155 TCF REV83 # AND START AGAIN.
029678,000199:
029679,000200: 37,3326 37710 GETRVN CA PRIO22 # INHIBIT SERVICER
029680,000201: 37,3327 05146 TC PRIOCHNG
029681,000202: 37,3330 06037 TC INTPRET
029682,000203: 37,3331 40375 VLOAD SETPD
029683,000204: 37,3332 01221 RN # LM STATE VECTOR IN RN,VN
029684,000205: 37,3333 00001 0
029685,000206: 37,3334 26207 STOVL RONE
029686,000207: 37,3335 01227 VN
029687,000208: 37,3336 26215 STOVL VONE # LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
029688,000209: 37,3337 01726 V(CSM) # (TO INSURE TIME COMPATABILITY)
029689,000210: 37,3340 65315 PDVL PDDL
029690,000211: 37,3341 01720 R(CSM)
029691,000212: 37,3342 01235 PIPTIME
029692,000213: 37,3343 77776 EXIT
029693,000214: 37,3344 35015 CA PRIO3
029694,000215: 37,3345 05146 TC PRIOCHNG
029695,000216: 37,3346 06037 TC INTPRET
029696,000217: 37,3347 77214 BOFF VLOAD
029697,000218: 37,3350 03347 MUNFLAG
029698,000219: 37,3351 77363 GETRVN2 # IF MUNFLAG RESET, DO CM DELTA PRECISION
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Page 707
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029700,000221: 37,3352 60505 VXM VSR4 # CHANGE TO REFERENCE SYSTEM AND RESCALE
029701,000222: 37,3353 01734 REFSMMAT
029702,000223: 37,3354 77715 PDVL # R TO PD 0-5
029703,000224: 37,3355 76505 VXM VSL1
029704,000225: 37,3356 01734 REFSMMAT
029705,000226: 37,3357 40206 PUSH SETPD # V TO PD 5-11
029706,000227: 37,3360 00001 0
029707,000228: 37,3361 77650 GOTO
029708,000229: 37,3362 77240 COMPDISP
029709,000230:
029710,000231: 37,3363 77624 GETRVN2 CALL
029711,000232: 37,3364 27414 INTSTALL
029712,000233: 37,3365 52014 CLEAR GOTO
029713,000234: 37,3366 01673 INTYPFLG # PREC EXTRAP FOR OTHER
029714,000235: 37,3367 77222 OTHINT
029715,000236: 37,3370 06037 R31SURF TC INTPRET
029716,000237: 37,3371 77634 RTB # LM IS ON SURFACE, SO PRECISION
029717,000238: 37,3372 21573 LOADTIME # INTEGRATION USES PLANETARY INERTIAL
029718,000239: 37,3373 34041 STCALL TDEC1 # ORIENTATION SUBROUTINE
029719,000240: 37,3374 27057 LEMPREC
029720,000241: 37,3375 77650 GOTO # DO CSM CONIC
029721,000242: 37,3376 77211 OTHCONIC
029722,000243: 37,3377 40102 MUNG? CS FLAGWRD6
029723,000244: 37,3400 74744 MASK MUNFLBIT
029724,000245: 37,3401 00006 EXTEND
029725,000246: 37,3402 13326 BZF GETRVN # IF MUNFLAG SET, CSM BASE NOT NEEDED
029726,000247:
029727,000248: 37,3403 06037 ONEBASE TC INTPRET # GET CSM BASE VECTOR
029728,000249: 37,3404 52034 RTB GOTO
029729,000250: 37,3405 21573 LOADTIME
029730,000251: 37,3406 77144 DOCMBASE
029731,000252:
029732,000253: 37,3407 04066 V16N54 VN 1654
029733,000254:
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Page 708
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029736,000257:
End of include-file R31.agc. Parent file is MAIN.agc