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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029739,000002: ## Copyright: Public domain.
029740,000003: ## Filename: P76.agc
029741,000004: ## Purpose: A section of Luminary revision 98.
029742,000005: ## It is part of the reconstructed source code for the a
029743,000006: ## development version of the flight software for the Lunar
029744,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029745,000008: ## The code has been recreated from a copy of Luminary 99
029746,000009: ## revision 001, using asterisks indicating changed lines in
029747,000010: ## the listing and Luminary Memo #85, which lists changes between
029748,000011: ## Luminary 98 and 99.
029749,000012: ## Reference: pp. 709-711
029750,000013: ## Assembler: yaYUL
029751,000014: ## Contact: Ron Burkey <info@sandroid.org>.
029752,000015: ## Website: www.ibiblio.org/apollo/index.html
029753,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
029754,000017:
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Page 709
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029756,000019: # 1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
029757,000020: # 2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
029758,000021: # TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
029759,000022: # TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY EXECUTION OF A THRUSTING MANEUVER. THE
029760,000023: # OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
029761,000024: # BEEN TRANSFORMED FROM LV TO REF COSYS). USING INTEGRVS, THE PROGRAM THEN INTEGRATES THE OTHER
029762,000025: # VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
029763,000026: # STATES CORRESPOND TO THE SAME TIME.
029764,000027: # 3) ERASABLE INITIALIZATION REQUIRED - NONE.
029765,000028: # 4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76E.
029766,000029: # EXITS BY TCF ENDOFJOB.
029767,000030: # 5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
029768,000031: # THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
029769,000032: # TO REF COSYS.
029770,000033: # 6) DEBRIS - OTHER VEHICLE STATE VECTOR.
029771,000034: # 7) SUBROUTINES CALLED - BANKCALL, GOXDSPF, CSMPREC (OR LEMPREC), ATOPCSM (OR ATOPLEM), INTSTALL, INTWAKE, PHASCHNG
029772,000035: # INTPRET, INTEGRVS, AND MINIRECT.
029773,000036: # 8) FLAG USE - MOONFLAG, CMOONFLAG, INTYPFLG, RASFLAG, AND MARKCTR.
029774,000037:
029775,000038: 30,2061 BANK 30
029776,000039: 13,2000 SETLOC P76LOC
029777,000040: 13,2000 BANK
029778,000041:
029779,000042: 13,2207 COUNT* $$/P76
029780,000043:
029781,000044: 13,2207 E7,1441 EBANK= TIG
029782,000045:
029783,000046: 13,2207 05504 P76 TC UPFLAG
029784,000047: 13,2210 00031 ADRES TRACKFLG
029785,000048:
029786,000049: 13,2211 06037 TC INTPRET
029787,000050: 13,2212 77775 VLOAD
029788,000051: 13,2213 03434 DELVLVC
029789,000052: 13,2214 02223 STORE DELVOV
029790,000053: 13,2215 77776 EXIT
029791,000054:
029792,000055: 13,2216 32336 CAF V06N84 # FLASH LAST DELTA V,
029793,000056: 13,2217 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029794,000057: 13,2220 20476 CADR GOFLASH
029795,000058: 13,2221 12333 TCF ENDP76
029796,000059: 13,2222 02224 TC +2 # PROCEED
029797,000060: 13,2223 02216 TC -5 # STORE DATA AND REPEAT FLASHING
029798,000061: 13,2224 32337 CAF V06N84 +1 # FLASH VERB 06 NOUN 33, DISPLAY LAST TIG,
029799,000062: 13,2225 04616 TC BANKCALL # AND WAIT FOR KEYBOARD ACTION.
029800,000063: 13,2226 20476 CADR GOFLASH
029801,000064: 13,2227 12333 TCF ENDP76
029802,000065: 13,2230 02232 TC +2
029803,000066: 13,2231 02224 TC -5
029804,000067: 13,2232 06037 TC INTPRET # RETURN TO INTERPRETIVE CODE
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Page 710
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029806,000069: 13,2233 77745 DLOAD # SET D(MPAC)=TIG IN CSEC B28
029807,000070: 13,2234 03442 TIG
029808,000071: 13,2235 34041 STCALL TDEC1 # SET TDEC1=TIG FOR ORBITAL INTEGRATION
029809,000072: 13,2236 27043 OTHPREC
029810,000073: 13,2237 53575 COMPMAT VLOAD UNIT
029811,000074: 13,2240 00001 RATT
029812,000075: 13,2241 77676 VCOMP # U(-R)
029813,000076: 13,2242 00031 STORE 24D # U(-R) TO 24D
029814,000077: 13,2243 53435 VXV UNIT # U(-R) X V = U(V X R)
029815,000078: 13,2244 00007 VATT
029816,000079: 13,2245 00023 STORE 18D
029817,000080: 13,2246 53435 VXV UNIT # U(V X R) X U(-R) = U((R X V) X R)
029818,000081: 13,2247 00031 24D
029819,000082: 13,2250 24015 STOVL 12D
029820,000083: 13,2251 02223 DELVOV
029821,000084: 13,2252 76505 VXM VSL1 # V(MPAC)=DELTA V IN REFCOSYS
029822,000085: 13,2253 00015 12D
029823,000086: 13,2254 77655 VAD
029824,000087: 13,2255 00007 VATT
029825,000088: 13,2256 00007 STORE 6 # V(PD6)=VATT + DELTA V
029826,000089: 13,2257 77624 CALL # PREVENT WOULD-BE USER OF ORBITAL
029827,000090: 13,2260 27414 INTSTALL # INTEG FROM INTERFERING WITH UPDATING
029828,000091: 13,2261 77624 CALL
029829,000092: 13,2262 26340 P76SUB1
029830,000093: 13,2263 53775 VLOAD VSR*
029831,000094: 13,2264 00007 6
029832,000095: 13,2265 57176 0,2
029833,000096: 13,2266 25543 STOVL VCV
029834,000097: 13,2267 00001 RATT
029835,000098: 13,2270 77657 VSR*
029836,000099: 13,2271 57176 0,2
029837,000100: 13,2272 15535 STODL RCV
029838,000101: 13,2273 03442 TIG
029839,000102: 13,2274 01517 STORE TET
029840,000103: 13,2275 71214 CLEAR DLOAD
029841,000104: 13,2276 01673 INTYPFLG
029842,000105: 13,2277 01643 TETTHIS
029843,000106: 13,2300 34041 INTOTHIS STCALL TDEC1
029844,000107: 13,2301 27107 INTEGRVS
029845,000108: 13,2302 77624 CALL
029846,000109: 13,2303 27414 INTSTALL
029847,000110: 13,2304 77775 VLOAD
029848,000111: 13,2305 00017 RATT1
029849,000112: 13,2306 01503 STORE RRECT
029850,000113: 13,2307 15535 STODL RCV
029851,000114: 13,2310 00015 TAT
029852,000115: 13,2311 25517 STOVL TET
029853,000116: 13,2312 00025 VATT1
029854,000117: 13,2313 77624 CALL
029855,000118: 13,2314 23455 MINIRECT
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Page 711
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029857,000120: 13,2315 77776 EXIT
029858,000121: 13,2316 05353 TC PHASCHNG
029859,000122: 13,2317 04024 OCT 04024
029860,000123:
029861,000124: 13,2320 05504 TC UPFLAG
029862,000125: 13,2321 00236 ADRES REINTFLG
029863,000126:
029864,000127: 13,2322 06037 TC INTPRET
029865,000128: 13,2323 77624 CALL
029866,000129: 13,2324 26661 ATOPOTH
029867,000130: 13,2325 77531 SSP EXIT
029868,000131: 13,2326 00053 QPRET
029869,000132: 13,2327 26332 OUT
029870,000133: 13,2330 04616 TC BANKCALL # PERMIT USE OF ORBITAL INTEGRATION
029871,000134: 13,2331 27445 CADR INTWAKE1
029872,000135: 13,2332 77776 OUT EXIT
029873,000136: 13,2333 34755 ENDP76 CAF ZERO
029874,000137: 13,2334 55462 TS MARKCTR # CLEAR RR TRACKING MARK COUNTER
029875,000138: 13,2335 16001 TCF GOTOPOOH
029876,000139:
029877,000140: 13,2336 01524 V06N84 NV 0684
029878,000141: 13,2337 01441 NV 0633
029879,000142: 13,2340 43174 P76SUB1 AXT,2 SET
029880,000143: 13,2341 00002 2
029881,000144: 13,2342 00063 MOONFLAG # SET MEANS MOON IS SPHERE OF INFLUENCE.
029882,000145: 13,2343 77014 BON AXT,2
029883,000146: 13,2344 04303 CMOONFLG # SET MEANS PERM CM STATE IN LUNAR SPHERE.
029884,000147: 13,2345 00052 QPRET
029885,000148: 13,2346 00000 0
029886,000149: 13,2347 43414 CLEAR RVQ
029887,000150: 13,2350 00263 MOONFLAG
029888,000151:
029889,000152:
029890,000153:
End of include-file P76.agc. Parent file is MAIN.agc