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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029750,000002: ## Copyright: Public domain.
029751,000003: ## Filename: P76.agc
029752,000004: ## Purpose: A section of Luminary revision 98.
029753,000005: ## It is part of the reconstructed source code for the a
029754,000006: ## development version of the flight software for the Lunar
029755,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029756,000008: ## The code has been recreated from a copy of Luminary 99
029757,000009: ## revision 001, using asterisks indicating changed lines in
029758,000010: ## the listing and Luminary Memo #85, which lists changes between
029759,000011: ## Luminary 98 and 99.
029760,000012: ## Reference: pp. 709-711
029761,000013: ## Assembler: yaYUL
029762,000014: ## Contact: Ron Burkey <info@sandroid.org>.
029763,000015: ## Website: www.ibiblio.org/apollo/index.html
029764,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
029765,000017:
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Page 709
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029767,000019: # 1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
029768,000020: # 2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
029769,000021: # TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
029770,000022: # TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY EXECUTION OF A THRUSTING MANEUVER. THE
029771,000023: # OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
029772,000024: # BEEN TRANSFORMED FROM LV TO REF COSYS). USING INTEGRVS, THE PROGRAM THEN INTEGRATES THE OTHER
029773,000025: # VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
029774,000026: # STATES CORRESPOND TO THE SAME TIME.
029775,000027: # 3) ERASABLE INITIALIZATION REQUIRED - NONE.
029776,000028: # 4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76E.
029777,000029: # EXITS BY TCF ENDOFJOB.
029778,000030: # 5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
029779,000031: # THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
029780,000032: # TO REF COSYS.
029781,000033: # 6) DEBRIS - OTHER VEHICLE STATE VECTOR.
029782,000034: # 7) SUBROUTINES CALLED - BANKCALL, GOXDSPF, CSMPREC (OR LEMPREC), ATOPCSM (OR ATOPLEM), INTSTALL, INTWAKE, PHASCHNG
029783,000035: # INTPRET, INTEGRVS, AND MINIRECT.
029784,000036: # 8) FLAG USE - MOONFLAG, CMOONFLAG, INTYPFLG, RASFLAG, AND MARKCTR.
029785,000037:
029786,000038: 30,2061 BANK 30
029787,000039: 13,2000 SETLOC P76LOC
029788,000040: 13,2000 BANK
029789,000041:
029790,000042: 13,2207 COUNT* $$/P76
029791,000043:
029792,000044: 13,2207 E7,1441 EBANK= TIG
029793,000045:
029794,000046: 13,2207 05504 P76 TC UPFLAG
029795,000047: 13,2210 00031 ADRES TRACKFLG
029796,000048:
029797,000049: 13,2211 06037 TC INTPRET
029798,000050: 13,2212 77775 VLOAD
029799,000051: 13,2213 03434 DELVLVC
029800,000052: 13,2214 02223 STORE DELVOV
029801,000053: 13,2215 77776 EXIT
029802,000054:
029803,000055: 13,2216 32336 CAF V06N84 # FLASH LAST DELTA V,
029804,000056: 13,2217 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029805,000057: 13,2220 20476 CADR GOFLASH
029806,000058: 13,2221 12333 TCF ENDP76
029807,000059: 13,2222 02224 TC +2 # PROCEED
029808,000060: 13,2223 02216 TC -5 # STORE DATA AND REPEAT FLASHING
029809,000061: 13,2224 32337 CAF V06N84 +1 # FLASH VERB 06 NOUN 33, DISPLAY LAST TIG,
029810,000062: 13,2225 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029811,000063: 13,2226 20476 CADR GOFLASH
029812,000064: 13,2227 12333 TCF ENDP76
029813,000065: 13,2230 02232 TC +2
029814,000066: 13,2231 02224 TC -5
029815,000067: 13,2232 06037 TC INTPRET # RETURN TO INTERPRETIVE CODE
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Page 710
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029817,000069: 13,2233 77745 DLOAD # SET D(MPAC)=TIG IN CSEC B28
029818,000070: 13,2234 03442 TIG
029819,000071: 13,2235 34041 STCALL TDEC1 # SET TDEC1=TIG FOR ORBITAL INTEGRATION
029820,000072: 13,2236 27043 OTHPREC
029821,000073: 13,2237 53575 COMPMAT VLOAD UNIT
029822,000074: 13,2240 00001 RATT
029823,000075: 13,2241 77676 VCOMP # U(-R)
029824,000076: 13,2242 00031 STORE 24D # U(-R) TO 24D
029825,000077: 13,2243 53435 VXV UNIT # U(-R) X V = U(V X R)
029826,000078: 13,2244 00007 VATT
029827,000079: 13,2245 00023 STORE 18D
029828,000080: 13,2246 53435 VXV UNIT # U(V X R) X U(-R) = U((R X V) X R)
029829,000081: 13,2247 00031 24D
029830,000082: 13,2250 24015 STOVL 12D
029831,000083: 13,2251 02223 DELVOV
029832,000084: 13,2252 76505 VXM VSL1 # V(MPAC)=DELTA V IN REFCOSYS
029833,000085: 13,2253 00015 12D
029834,000086: 13,2254 77655 VAD
029835,000087: 13,2255 00007 VATT
029836,000088: 13,2256 00007 STORE 6 # V(PD6)=VATT + DELTA V
029837,000089: 13,2257 77624 CALL # PREVENT WOULD-BE USER OF ORBITAL
029838,000090: 13,2260 27414 INTSTALL # INTEG FROM INTERFERING WITH UPDATING
029839,000091: 13,2261 77624 CALL
029840,000092: 13,2262 26340 P76SUB1
029841,000093: 13,2263 53775 VLOAD VSR*
029842,000094: 13,2264 00007 6
029843,000095: 13,2265 57176 0,2
029844,000096: 13,2266 25543 STOVL VCV
029845,000097: 13,2267 00001 RATT
029846,000098: 13,2270 77657 VSR*
029847,000099: 13,2271 57176 0,2
029848,000100: 13,2272 15535 STODL RCV
029849,000101: 13,2273 03442 TIG
029850,000102: 13,2274 01517 STORE TET
029851,000103: 13,2275 71214 CLEAR DLOAD
029852,000104: 13,2276 01673 INTYPFLG
029853,000105: 13,2277 01643 TETTHIS
029854,000106: 13,2300 34041 INTOTHIS STCALL TDEC1
029855,000107: 13,2301 27107 INTEGRVS
029856,000108: 13,2302 77624 CALL
029857,000109: 13,2303 27414 INTSTALL
029858,000110: 13,2304 77775 VLOAD
029859,000111: 13,2305 00017 RATT1
029860,000112: 13,2306 01503 STORE RRECT
029861,000113: 13,2307 15535 STODL RCV
029862,000114: 13,2310 00015 TAT
029863,000115: 13,2311 25517 STOVL TET
029864,000116: 13,2312 00025 VATT1
029865,000117: 13,2313 77624 CALL
029866,000118: 13,2314 23455 MINIRECT
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Page 711
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029868,000120: 13,2315 77776 EXIT
029869,000121: 13,2316 05353 TC PHASCHNG
029870,000122: 13,2317 04024 OCT 04024
029871,000123:
029872,000124: 13,2320 05504 TC UPFLAG
029873,000125: 13,2321 00236 ADRES REINTFLG
029874,000126:
029875,000127: 13,2322 06037 TC INTPRET
029876,000128: 13,2323 77624 CALL
029877,000129: 13,2324 26661 ATOPOTH
029878,000130: 13,2325 77531 SSP EXIT
029879,000131: 13,2326 00053 QPRET
029880,000132: 13,2327 26332 OUT
029881,000133: 13,2330 04616 TC BANKCALL # PERMIT USE OF ORBITAL INTEGRATION
029882,000134: 13,2331 27445 CADR INTWAKE1
029883,000135: 13,2332 77776 OUT EXIT
029884,000136: 13,2333 34755 ENDP76 CAF ZERO
029885,000137: 13,2334 55462 TS MARKCTR # CLEAR RR TRACKING MARK COUNTER
029886,000138: 13,2335 16001 TCF GOTOPOOH
029887,000139:
029888,000140: 13,2336 01524 V06N84 NV 0684
029889,000141: 13,2337 01441 NV 0633
029890,000142: 13,2340 43174 P76SUB1 AXT,2 SET
029891,000143: 13,2341 00002 2
029892,000144: 13,2342 00063 MOONFLAG # SET MEANS MOON IS SPHERE OF INFLUENCE.
029893,000145: 13,2343 77014 BON AXT,2
029894,000146: 13,2344 04303 CMOONFLG # SET MEANS PERM CM STATE IN LUNAR SPHERE.
029895,000147: 13,2345 00052 QPRET
029896,000148: 13,2346 00000 0
029897,000149: 13,2347 43414 CLEAR RVQ
029898,000150: 13,2350 00263 MOONFLAG
029899,000151:
029900,000152:
029901,000153:
End of include-file P76.agc. Parent file is MAIN.agc