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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029885,000002: ## Copyright: Public domain.
029886,000003: ## Filename: P76.agc
029887,000004: ## Purpose: A section of Luminary revision 97.
029888,000005: ## It is part of the reconstructed source code for the
029889,000006: ## original release of the flight software for the Lunar
029890,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029891,000008: ## The code has been recreated from a copy of Luminary 99
029892,000009: ## revision 001, using asterisks indicating changed lines in
029893,000010: ## the listing and Luminary Memos #83 and #85, which list
029894,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
029895,000012: ## code has been adapted such that the resulting bugger words
029896,000013: ## exactly match those specified for Luminary 97 in NASA drawing
029897,000014: ## 2021152D, which gives relatively high confidence that the
029898,000015: ## reconstruction is correct.
029899,000016: ## Reference: pp. 709-711
029900,000017: ## Assembler: yaYUL
029901,000018: ## Contact: Ron Burkey <info@sandroid.org>.
029902,000019: ## Website: www.ibiblio.org/apollo/index.html
029903,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
029904,000021:
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Page 709
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029906,000023: # 1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
029907,000024: # 2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
029908,000025: # TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
029909,000026: # TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY EXECUTION OF A THRUSTING MANEUVER. THE
029910,000027: # OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
029911,000028: # BEEN TRANSFORMED FROM LV TO REF COSYS). USING INTEGRVS, THE PROGRAM THEN INTEGRATES THE OTHER
029912,000029: # VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
029913,000030: # STATES CORRESPOND TO THE SAME TIME.
029914,000031: # 3) ERASABLE INITIALIZATION REQUIRED - NONE.
029915,000032: # 4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76E.
029916,000033: # EXITS BY TCF ENDOFJOB.
029917,000034: # 5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
029918,000035: # THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
029919,000036: # TO REF COSYS.
029920,000037: # 6) DEBRIS - OTHER VEHICLE STATE VECTOR.
029921,000038: # 7) SUBROUTINES CALLED - BANKCALL, GOXDSPF, CSMPREC (OR LEMPREC), ATOPCSM (OR ATOPLEM), INTSTALL, INTWAKE, PHASCHNG
029922,000039: # INTPRET, INTEGRVS, AND MINIRECT.
029923,000040: # 8) FLAG USE - MOONFLAG, CMOONFLAG, INTYPFLG, RASFLAG, AND MARKCTR.
029924,000041:
029925,000042: 30,2061 BANK 30
029926,000043: 13,2000 SETLOC P76LOC
029927,000044: 13,2000 BANK
029928,000045:
029929,000046: 13,2207 COUNT* $$/P76
029930,000047:
029931,000048: 13,2207 E7,1441 EBANK= TIG
029932,000049:
029933,000050: 13,2207 05504 P76 TC UPFLAG
029934,000051: 13,2210 00031 ADRES TRACKFLG
029935,000052:
029936,000053: 13,2211 06037 TC INTPRET
029937,000054: 13,2212 77775 VLOAD
029938,000055: 13,2213 03434 DELVLVC
029939,000056: 13,2214 02223 STORE DELVOV
029940,000057: 13,2215 77776 EXIT
029941,000058:
029942,000059: 13,2216 32336 CAF V06N84 # FLASH LAST DELTA V,
029943,000060: 13,2217 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029944,000061: 13,2220 20476 CADR GOFLASH
029945,000062: 13,2221 12333 TCF ENDP76
029946,000063: 13,2222 02224 TC +2 # PROCEED
029947,000064: 13,2223 02216 TC -5 # STORE DATA AND REPEAT FLASHING
029948,000065: 13,2224 32337 CAF V06N84 +1 # FLASH VERB 06 NOUN 33, DISPLAY LAST TIG,
029949,000066: 13,2225 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029950,000067: 13,2226 20476 CADR GOFLASH
029951,000068: 13,2227 12333 TCF ENDP76
029952,000069: 13,2230 02232 TC +2
029953,000070: 13,2231 02224 TC -5
029954,000071: 13,2232 06037 TC INTPRET # RETURN TO INTERPRETIVE CODE
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Page 710
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029956,000073: 13,2233 77745 DLOAD # SET D(MPAC)=TIG IN CSEC B28
029957,000074: 13,2234 03442 TIG
029958,000075: 13,2235 34041 STCALL TDEC1 # SET TDEC1=TIG FOR ORBITAL INTEGRATION
029959,000076: 13,2236 27043 OTHPREC
029960,000077: 13,2237 53575 COMPMAT VLOAD UNIT
029961,000078: 13,2240 00001 RATT
029962,000079: 13,2241 77676 VCOMP # U(-R)
029963,000080: 13,2242 00031 STORE 24D # U(-R) TO 24D
029964,000081: 13,2243 53435 VXV UNIT # U(-R) X V = U(V X R)
029965,000082: 13,2244 00007 VATT
029966,000083: 13,2245 00023 STORE 18D
029967,000084: 13,2246 53435 VXV UNIT # U(V X R) X U(-R) = U((R X V) X R)
029968,000085: 13,2247 00031 24D
029969,000086: 13,2250 24015 STOVL 12D
029970,000087: 13,2251 02223 DELVOV
029971,000088: 13,2252 76505 VXM VSL1 # V(MPAC)=DELTA V IN REFCOSYS
029972,000089: 13,2253 00015 12D
029973,000090: 13,2254 77655 VAD
029974,000091: 13,2255 00007 VATT
029975,000092: 13,2256 00007 STORE 6 # V(PD6)=VATT + DELTA V
029976,000093: 13,2257 77624 CALL # PREVENT WOULD-BE USER OF ORBITAL
029977,000094: 13,2260 27414 INTSTALL # INTEG FROM INTERFERING WITH UPDATING
029978,000095: 13,2261 77624 CALL
029979,000096: 13,2262 26340 P76SUB1
029980,000097: 13,2263 53775 VLOAD VSR*
029981,000098: 13,2264 00007 6
029982,000099: 13,2265 57176 0,2
029983,000100: 13,2266 25543 STOVL VCV
029984,000101: 13,2267 00001 RATT
029985,000102: 13,2270 77657 VSR*
029986,000103: 13,2271 57176 0,2
029987,000104: 13,2272 15535 STODL RCV
029988,000105: 13,2273 03442 TIG
029989,000106: 13,2274 01517 STORE TET
029990,000107: 13,2275 71214 CLEAR DLOAD
029991,000108: 13,2276 01673 INTYPFLG
029992,000109: 13,2277 01643 TETTHIS
029993,000110: 13,2300 34041 INTOTHIS STCALL TDEC1
029994,000111: 13,2301 27107 INTEGRVS
029995,000112: 13,2302 77624 CALL
029996,000113: 13,2303 27414 INTSTALL
029997,000114: 13,2304 77775 VLOAD
029998,000115: 13,2305 00017 RATT1
029999,000116: 13,2306 01503 STORE RRECT
030000,000117: 13,2307 15535 STODL RCV
030001,000118: 13,2310 00015 TAT
030002,000119: 13,2311 25517 STOVL TET
030003,000120: 13,2312 00025 VATT1
030004,000121: 13,2313 77624 CALL
030005,000122: 13,2314 23455 MINIRECT
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Page 711
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030007,000124: 13,2315 77776 EXIT
030008,000125: 13,2316 05353 TC PHASCHNG
030009,000126: 13,2317 04024 OCT 04024
030010,000127:
030011,000128: 13,2320 05504 TC UPFLAG
030012,000129: 13,2321 00236 ADRES REINTFLG
030013,000130:
030014,000131: 13,2322 06037 TC INTPRET
030015,000132: 13,2323 77624 CALL
030016,000133: 13,2324 26661 ATOPOTH
030017,000134: 13,2325 77531 SSP EXIT
030018,000135: 13,2326 00053 QPRET
030019,000136: 13,2327 26332 OUT
030020,000137: 13,2330 04616 TC BANKCALL # PERMIT USE OF ORBITAL INTEGRATION
030021,000138: 13,2331 27445 CADR INTWAKE1
030022,000139: 13,2332 77776 OUT EXIT
030023,000140: 13,2333 34755 ENDP76 CAF ZERO
030024,000141: 13,2334 55462 TS MARKCTR # CLEAR RR TRACKING MARK COUNTER
030025,000142: 13,2335 16001 TCF GOTOPOOH
030026,000143:
030027,000144: 13,2336 01524 V06N84 NV 0684
030028,000145: 13,2337 01441 NV 0633
030029,000146: 13,2340 43174 P76SUB1 AXT,2 SET
030030,000147: 13,2341 00002 2
030031,000148: 13,2342 00063 MOONFLAG # SET MEANS MOON IS SPHERE OF INFLUENCE.
030032,000149: 13,2343 77014 BON AXT,2
030033,000150: 13,2344 04303 CMOONFLG # SET MEANS PERM CM STATE IN LUNAR SPHERE.
030034,000151: 13,2345 00052 QPRET
030035,000152: 13,2346 00000 0
030036,000153: 13,2347 43414 CLEAR RVQ
030037,000154: 13,2350 00263 MOONFLAG
030038,000155:
030039,000156:
030040,000157:
End of include-file P76.agc. Parent file is MAIN.agc