Source Code
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These source-code files are part of a reconstructed copy of Luminary 96, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with reconstructed source code for Luminary 97. Changes
between revisions 96 and 97 were backed out, as described by anomal report LNY-59.
transcribed from a digitized copy of that program. 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 96 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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027448,000002: ## Copyright: Public domain.
027449,000003: ## Filename: LAMBERT_AIMPOINT_GUIDANCE.agc
027450,000004: ## Purpose: A section of Luminary revision 96.
027451,000005: ## It is part of the reconstructed source code for the
027452,000006: ## original release of the flight software for the Lunar
027453,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
027454,000008: ## The code has been recreated from a previously reconstructed
027455,000009: ## copy of Luminary 97 by undoing changes described in anomaly
027456,000010: ## report LNY-59. The code has been adapted such that the
027457,000011: ## resulting bugger words exactly match those specified for
027458,000012: ## Luminary 96 in NASA drawing 2021152D, which gives relatively
027459,000013: ## high confidence that the reconstruction is correct.
027460,000014: ## Reference: pp. 651-653
027461,000015: ## Assembler: yaYUL
027462,000016: ## Contact: Ron Burkey <info@sandroid.org>.
027463,000017: ## Website: www.ibiblio.org/apollo/index.html
027464,000018: ## Mod history: 2019-08-04 MAS Created from Luminary 97.
027465,000019:
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Page 651
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027467,000021:
027468,000022: # GENERAL LAMBERT AIMPOINT GUIDANCE **
027469,000023: # WRITTEN BY RAMA M AIYAWAR
027470,000024:
027471,000025: # PROGRAM P-31 DESCRIPTION **
027472,000026:
027473,000027: # 1. TO ACCEPT TARGETING PARAMETERS OBTAINED FROM A SOURCE EXTERNAL
027474,000028: # TO THE LEM AND COMPUTE THERE FROM THE REQUIRED-VELOCITY AND
027475,000029: # OTHER INITIAL CONDITIONS REQUIRED BY LM FOR DESIRED MANEUVER.
027476,000030: # THE TARGETING PARAMETERS ARE TIG (TIME OF IGNITION), TARGET
027477,000031: # VECTOR (RTARG), AND THE TIME FROM TIG UNTIL THE TARGET IS
027478,000032: # REACHED (DELLT4), DESIRED TIME OF FLIGHT FROM RINIT TO RTARG..
027479,000033:
027480,000034: # ASSUMPTIONS **
027481,000035:
027482,000036: # 1. THE TARGET PARAMETERS MAY HAVE BEEN LOADED PRIOR TO THE
027483,000037: # EXECUTION OF THIS PROGRAM.
027484,000038: # 2. THIS PROGRAM IS APPLICABLE IN EITHER EARTH OR LUNAR ORBIT.
027485,000039: # 3. THIS PROGRAM IS DESIGNED FOR ONE-MAN OPERATION, AND SHOULD
027486,000040: # BE SELECTED BY THE ASTRONAUT BY DSKY ENTRY V37 E31.
027487,000041:
027488,000042: # SUBROUTINES USED **
027489,000043: #
027490,000044: # MANUPARM, TTG/N35, R02BOTH, MIDGIM, DISPMGA, FLAGDOWN, BANKCALL,
027491,000045: # GOTOPOOH, ENDOFJOB, PHASCHNG, GOFLASHR, GOFLASH.
027492,000046:
027493,000047: # MANUPARM CALCULATES APOGEE, PERIGEE ALTITUDES AND DELTAV DESIRED
027494,000048: # FOR THE MANEUVER.
027495,000049:
027496,000050: # TTG/N35 CLOCKTASK - UPDATES CLOCK.
027497,000051:
027498,000052: # MIDGIM CALCULATES MIDDLE GIMBAL ANGLE FOR DISPLAY.
027499,000053:
027500,000054: # R02BOTH IMU - STATUS CHECK ROUTINE.
027501,000055:
027502,000056: # DISPLAYS USED IN P-31LM **
027503,000057:
027504,000058: # V06N33 DISPLAY SOTRED TIG (IN HRS. MINS. SECS)
027505,000059: # V06N42 DISPLAY APOGEE, PERIGEE, DELTAV.
027506,000060: # V16N35 DISPLAY TIME FROM TIG.
027507,000061: # V06N45 TIME FROM IGNITION AND MIDDLE GIMBAL ANGLE.
027508,000062:
027509,000063: # ERASABLE INITIALIZATION REQUIRED **
027510,000064:
027511,000065: # TIG TIME OF IGNITION DP (B+28) CS.
027512,000066:
027513,000067: # DELLT4 DESIRED TIME OF FLIGHT DP (B+28) CS
027514,000068: # FROM RINIT TO RTARG.
027515,000069:
027516,000070: # RTARG RADIUS VECTOR OF TARGET POSITION VECTOR
027517,000071: # RADIUS VECTOR SCALED TO (B+29)METERS IF EARTH ORBIT
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Page 652
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027519,000073: # RADIUS VECTOR SCALED TO (B+27)METERS IF MOON ORBIT
027520,000074:
027521,000075: # OUTPUT **
027522,000076:
027523,000077: # HAPO APOGEE ALTITUDE
027524,000078: # HPER PERIGEE ALTITUDE
027525,000079: # VGDISP MAG. OF DELTAV FOR DISPLAY, SCALING B+7 M/CS EARTH
027526,000080: # MAG. OF DELTAV FOR DISPLAY, SCALING B+5 M/CS MOON
027527,000081: # MIDGIM MIDDLE GIMBAL ANGLE
027528,000082: # XDELVFLG RESETS XDELVFLG FOR LAMBERT VG COMPUTATIONS
027529,000083:
027530,000084: # ALARMS OR ABORTS NONE **
027531,000085:
027532,000086: # RESTARTS ARE VIA GROUP 4 **
027533,000087:
027534,000088: 35,2000 SETLOC GLM
027535,000089: 35,2000 BANK
027536,000090:
027537,000091: 35,2450 E7,1470 EBANK= SUBEXIT
027538,000092:
027539,000093: 35,2450 COUNT* $$/P31
027540,000094: 35,2450 02361 P31 TC P20FLGON
027541,000095: 35,2451 32025 CAF V06N33 # TIG
027542,000096: 35,2452 03712 TC VNPOOH
027543,000097: 35,2453 06037 TC INTPRET
027544,000098: 35,2454 71214 CLEAR DLOAD
027545,000099: 35,2455 00670 UPDATFLG
027546,000100: 35,2456 03442 TIG
027547,000101: 35,2457 34041 STCALL TDEC1 # INTEGRATE STATE VECTORS TO TIG
027548,000102: 35,2460 27057 LEMPREC
027549,000103: 35,2461 40375 VLOAD SETPD
027550,000104: 35,2462 00001 RATT
027551,000105: 35,2463 00001 0D
027552,000106: 35,2464 03642 STORE RTIG
027553,000107: 35,2465 26323 STOVL RINIT
027554,000108: 35,2466 00007 VATT
027555,000109: 35,2467 03650 STORE VTIG
027556,000110: 35,2470 16331 STODL VINIT
027557,000111: 35,2471 32420 P30ZERO
027558,000112: 35,2472 65206 PUSH PDDL # E4 AND NUMIT = 0
027559,000113: 35,2473 03452 DELLT4
027560,000114: 35,2474 66015 DAD SXA,1
027561,000115: 35,2475 03442 TIG
027562,000116: 35,2476 02776 RTX1
027563,000117: 35,2477 03631 STORE TPASS4
027564,000118: 35,2500 45134 SXA,2 CALL
027565,000119: 35,2501 02777 RTX2
027566,000120: 35,2502 22000 INITVEL
027567,000121: 35,2503 41575 VLOAD PUSH
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Page 653
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027569,000123: 35,2504 02366 DELVEET3
027570,000124: 35,2505 03656 STORE DELVSIN
027571,000125: 35,2506 43046 ABVAL CLEAR
027572,000126: 35,2507 01267 XDELVFLG
027573,000127: 35,2510 37664 STCALL VGDISP
027574,000128: 35,2511 15733 GET.LVC
027575,000129: 35,2512 63375 VLOAD PDVL
027576,000130: 35,2513 03642 RTIG
027577,000131: 35,2514 02337 VIPRIME
027578,000132: 35,2515 77624 CALL
027579,000133: 35,2516 46316 PERIAPO1
027580,000134: 35,2517 77624 CALL
027581,000135: 35,2520 46426 SHIFTR1
027582,000136: 35,2521 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027583,000137: 35,2522 45636 MAXCHK
027584,000138: 35,2523 16321 STODL HPER
027585,000139: 35,2524 00005 4D
027586,000140: 35,2525 77624 CALL
027587,000141: 35,2526 46426 SHIFTR1
027588,000142: 35,2527 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027589,000143: 35,2530 45636 MAXCHK
027590,000144: 35,2531 02317 STORE HAPO
027591,000145: 35,2532 77776 EXIT
027592,000146: 35,2533 33727 CAF V06N81 # DELVLVC
027593,000147: 35,2534 03712 TC VNPOOH
027594,000148: 35,2535 32026 CAF V06N42 # HAPO, HPER, VGDISP
027595,000149: 35,2536 03712 TC VNPOOH
027596,000150: 35,2537 06037 TC INTPRET
027597,000151: 35,2540 45014 REVN1645 SET CALL # TRKMKCNT, TTOGO, +MGA
027598,000152: 35,2541 01071 FINALFLG
027599,000153: 35,2542 73606 VN1645
027600,000154: 35,2543 77650 GOTO
027601,000155: 35,2544 72540 REVN1645
027602,000156:
End of include-file LAMBERT_AIMPOINT_GUIDANCE.agc. Parent file is MAIN.agc