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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027374,000002: ## Copyright: Public domain.
027375,000003: ## Filename: LAMBERT_AIMPOINT_GUIDANCE.agc
027376,000004: ## Purpose: A section of Luminary revision 98.
027377,000005: ## It is part of the reconstructed source code for the a
027378,000006: ## development version of the flight software for the Lunar
027379,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
027380,000008: ## The code has been recreated from a copy of Luminary 99
027381,000009: ## revision 001, using asterisks indicating changed lines in
027382,000010: ## the listing and Luminary Memo #85, which lists changes between
027383,000011: ## Luminary 98 and 99.
027384,000012: ## Reference: pp. 651-653
027385,000013: ## Assembler: yaYUL
027386,000014: ## Contact: Ron Burkey <info@sandroid.org>.
027387,000015: ## Website: www.ibiblio.org/apollo/index.html
027388,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
027389,000017:
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Page 651
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027391,000019:
027392,000020: # GENERAL LAMBERT AIMPOINT GUIDANCE **
027393,000021: # WRITTEN BY RAMA M AIYAWAR
027394,000022:
027395,000023: # PROGRAM P-31 DESCRIPTION **
027396,000024:
027397,000025: # 1. TO ACCEPT TARGETING PARAMETERS OBTAINED FROM A SOURCE EXTERNAL
027398,000026: # TO THE LEM AND COMPUTE THERE FROM THE REQUIRED-VELOCITY AND
027399,000027: # OTHER INITIAL CONDITIONS REQUIRED BY LM FOR DESIRED MANEUVER.
027400,000028: # THE TARGETING PARAMETERS ARE TIG (TIME OF IGNITION), TARGET
027401,000029: # VECTOR (RTARG), AND THE TIME FROM TIG UNTIL THE TARGET IS
027402,000030: # REACHED (DELLT4), DESIRED TIME OF FLIGHT FROM RINIT TO RTARG..
027403,000031:
027404,000032: # ASSUMPTIONS **
027405,000033:
027406,000034: # 1. THE TARGET PARAMETERS MAY HAVE BEEN LOADED PRIOR TO THE
027407,000035: # EXECUTION OF THIS PROGRAM.
027408,000036: # 2. THIS PROGRAM IS APPLICABLE IN EITHER EARTH OR LUNAR ORBIT.
027409,000037: # 3. THIS PROGRAM IS DESIGNED FOR ONE-MAN OPERATION, AND SHOULD
027410,000038: # BE SELECTED BY THE ASTRONAUT BY DSKY ENTRY V37 E31.
027411,000039:
027412,000040: # SUBROUTINES USED **
027413,000041: #
027414,000042: # MANUPARM, TTG/N35, R02BOTH, MIDGIM, DISPMGA, FLAGDOWN, BANKCALL,
027415,000043: # GOTOPOOH, ENDOFJOB, PHASCHNG, GOFLASHR, GOFLASH.
027416,000044:
027417,000045: # MANUPARM CALCULATES APOGEE, PERIGEE ALTITUDES AND DELTAV DESIRED
027418,000046: # FOR THE MANEUVER.
027419,000047:
027420,000048: # TTG/N35 CLOCKTASK - UPDATES CLOCK.
027421,000049:
027422,000050: # MIDGIM CALCULATES MIDDLE GIMBAL ANGLE FOR DISPLAY.
027423,000051:
027424,000052: # R02BOTH IMU - STATUS CHECK ROUTINE.
027425,000053:
027426,000054: # DISPLAYS USED IN P-31LM **
027427,000055:
027428,000056: # V06N33 DISPLAY SOTRED TIG (IN HRS. MINS. SECS)
027429,000057: # V06N42 DISPLAY APOGEE, PERIGEE, DELTAV.
027430,000058: # V16N35 DISPLAY TIME FROM TIG.
027431,000059: # V06N45 TIME FROM IGNITION AND MIDDLE GIMBAL ANGLE.
027432,000060:
027433,000061: # ERASABLE INITIALIZATION REQUIRED **
027434,000062:
027435,000063: # TIG TIME OF IGNITION DP (B+28) CS.
027436,000064:
027437,000065: # DELLT4 DESIRED TIME OF FLIGHT DP (B+28) CS
027438,000066: # FROM RINIT TO RTARG.
027439,000067:
027440,000068: # RTARG RADIUS VECTOR OF TARGET POSITION VECTOR
027441,000069: # RADIUS VECTOR SCALED TO (B+29)METERS IF EARTH ORBIT
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Page 652
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027443,000071: # RADIUS VECTOR SCALED TO (B+27)METERS IF MOON ORBIT
027444,000072:
027445,000073: # OUTPUT **
027446,000074:
027447,000075: # HAPO APOGEE ALTITUDE
027448,000076: # HPER PERIGEE ALTITUDE
027449,000077: # VGDISP MAG. OF DELTAV FOR DISPLAY, SCALING B+7 M/CS EARTH
027450,000078: # MAG. OF DELTAV FOR DISPLAY, SCALING B+5 M/CS MOON
027451,000079: # MIDGIM MIDDLE GIMBAL ANGLE
027452,000080: # XDELVFLG RESETS XDELVFLG FOR LAMBERT VG COMPUTATIONS
027453,000081:
027454,000082: # ALARMS OR ABORTS NONE **
027455,000083:
027456,000084: # RESTARTS ARE VIA GROUP 4 **
027457,000085:
027458,000086: 35,2000 SETLOC GLM
027459,000087: 35,2000 BANK
027460,000088:
027461,000089: 35,2450 E7,1470 EBANK= SUBEXIT
027462,000090:
027463,000091: 35,2450 COUNT* $$/P31
027464,000092: 35,2450 02361 P31 TC P20FLGON
027465,000093: 35,2451 32025 CAF V06N33 # TIG
027466,000094: 35,2452 03712 TC VNPOOH
027467,000095: 35,2453 06037 TC INTPRET
027468,000096: 35,2454 71214 CLEAR DLOAD
027469,000097: 35,2455 00670 UPDATFLG
027470,000098: 35,2456 03442 TIG
027471,000099: 35,2457 34041 STCALL TDEC1 # INTEGRATE STATE VECTORS TO TIG
027472,000100: 35,2460 27057 LEMPREC
027473,000101: 35,2461 40375 VLOAD SETPD
027474,000102: 35,2462 00001 RATT
027475,000103: 35,2463 00001 0D
027476,000104: 35,2464 03642 STORE RTIG
027477,000105: 35,2465 26323 STOVL RINIT
027478,000106: 35,2466 00007 VATT
027479,000107: 35,2467 03650 STORE VTIG
027480,000108: 35,2470 16331 STODL VINIT
027481,000109: 35,2471 32420 P30ZERO
027482,000110: 35,2472 65206 PUSH PDDL # E4 AND NUMIT = 0
027483,000111: 35,2473 03452 DELLT4
027484,000112: 35,2474 66015 DAD SXA,1
027485,000113: 35,2475 03442 TIG
027486,000114: 35,2476 02776 RTX1
027487,000115: 35,2477 03631 STORE TPASS4
027488,000116: 35,2500 45134 SXA,2 CALL
027489,000117: 35,2501 02777 RTX2
027490,000118: 35,2502 22000 INITVEL
027491,000119: 35,2503 41575 VLOAD PUSH
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Page 653
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027493,000121: 35,2504 02366 DELVEET3
027494,000122: 35,2505 03656 STORE DELVSIN
027495,000123: 35,2506 43046 ABVAL CLEAR
027496,000124: 35,2507 01267 XDELVFLG
027497,000125: 35,2510 37664 STCALL VGDISP
027498,000126: 35,2511 15733 GET.LVC
027499,000127: 35,2512 63375 VLOAD PDVL
027500,000128: 35,2513 03642 RTIG
027501,000129: 35,2514 02337 VIPRIME
027502,000130: 35,2515 77624 CALL
027503,000131: 35,2516 46316 PERIAPO1
027504,000132: 35,2517 77624 CALL
027505,000133: 35,2520 46426 SHIFTR1
027506,000134: 35,2521 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027507,000135: 35,2522 45636 MAXCHK
027508,000136: 35,2523 16321 STODL HPER
027509,000137: 35,2524 00005 4D
027510,000138: 35,2525 77624 CALL
027511,000139: 35,2526 46426 SHIFTR1
027512,000140: 35,2527 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027513,000141: 35,2530 45636 MAXCHK
027514,000142: 35,2531 02317 STORE HAPO
027515,000143: 35,2532 77776 EXIT
027516,000144: 35,2533 33727 CAF V06N81 # DELVLVC
027517,000145: 35,2534 03712 TC VNPOOH
027518,000146: 35,2535 32026 CAF V06N42 # HAPO, HPER, VGDISP
027519,000147: 35,2536 03712 TC VNPOOH
027520,000148: 35,2537 06037 TC INTPRET
027521,000149: 35,2540 45014 REVN1645 SET CALL # TRKMKCNT, TTOGO, +MGA
027522,000150: 35,2541 01071 FINALFLG
027523,000151: 35,2542 73606 VN1645
027524,000152: 35,2543 77650 GOTO
027525,000153: 35,2544 72540 REVN1645
027526,000154:
End of include-file LAMBERT_AIMPOINT_GUIDANCE.agc. Parent file is MAIN.agc