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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027385,000002: ## Copyright: Public domain.
027386,000003: ## Filename: LAMBERT_AIMPOINT_GUIDANCE.agc
027387,000004: ## Purpose: A section of Luminary revision 98.
027388,000005: ## It is part of the reconstructed source code for the a
027389,000006: ## development version of the flight software for the Lunar
027390,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
027391,000008: ## The code has been recreated from a copy of Luminary 99
027392,000009: ## revision 001, using asterisks indicating changed lines in
027393,000010: ## the listing and Luminary Memo #85, which lists changes between
027394,000011: ## Luminary 98 and 99.
027395,000012: ## Reference: pp. 651-653
027396,000013: ## Assembler: yaYUL
027397,000014: ## Contact: Ron Burkey <info@sandroid.org>.
027398,000015: ## Website: www.ibiblio.org/apollo/index.html
027399,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
027400,000017:
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Page 651
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027402,000019:
027403,000020: # GENERAL LAMBERT AIMPOINT GUIDANCE **
027404,000021: # WRITTEN BY RAMA M AIYAWAR
027405,000022:
027406,000023: # PROGRAM P-31 DESCRIPTION **
027407,000024:
027408,000025: # 1. TO ACCEPT TARGETING PARAMETERS OBTAINED FROM A SOURCE EXTERNAL
027409,000026: # TO THE LEM AND COMPUTE THERE FROM THE REQUIRED-VELOCITY AND
027410,000027: # OTHER INITIAL CONDITIONS REQUIRED BY LM FOR DESIRED MANEUVER.
027411,000028: # THE TARGETING PARAMETERS ARE TIG (TIME OF IGNITION), TARGET
027412,000029: # VECTOR (RTARG), AND THE TIME FROM TIG UNTIL THE TARGET IS
027413,000030: # REACHED (DELLT4), DESIRED TIME OF FLIGHT FROM RINIT TO RTARG..
027414,000031:
027415,000032: # ASSUMPTIONS **
027416,000033:
027417,000034: # 1. THE TARGET PARAMETERS MAY HAVE BEEN LOADED PRIOR TO THE
027418,000035: # EXECUTION OF THIS PROGRAM.
027419,000036: # 2. THIS PROGRAM IS APPLICABLE IN EITHER EARTH OR LUNAR ORBIT.
027420,000037: # 3. THIS PROGRAM IS DESIGNED FOR ONE-MAN OPERATION, AND SHOULD
027421,000038: # BE SELECTED BY THE ASTRONAUT BY DSKY ENTRY V37 E31.
027422,000039:
027423,000040: # SUBROUTINES USED **
027424,000041: #
027425,000042: # MANUPARM, TTG/N35, R02BOTH, MIDGIM, DISPMGA, FLAGDOWN, BANKCALL,
027426,000043: # GOTOPOOH, ENDOFJOB, PHASCHNG, GOFLASHR, GOFLASH.
027427,000044:
027428,000045: # MANUPARM CALCULATES APOGEE, PERIGEE ALTITUDES AND DELTAV DESIRED
027429,000046: # FOR THE MANEUVER.
027430,000047:
027431,000048: # TTG/N35 CLOCKTASK - UPDATES CLOCK.
027432,000049:
027433,000050: # MIDGIM CALCULATES MIDDLE GIMBAL ANGLE FOR DISPLAY.
027434,000051:
027435,000052: # R02BOTH IMU - STATUS CHECK ROUTINE.
027436,000053:
027437,000054: # DISPLAYS USED IN P-31LM **
027438,000055:
027439,000056: # V06N33 DISPLAY SOTRED TIG (IN HRS. MINS. SECS)
027440,000057: # V06N42 DISPLAY APOGEE, PERIGEE, DELTAV.
027441,000058: # V16N35 DISPLAY TIME FROM TIG.
027442,000059: # V06N45 TIME FROM IGNITION AND MIDDLE GIMBAL ANGLE.
027443,000060:
027444,000061: # ERASABLE INITIALIZATION REQUIRED **
027445,000062:
027446,000063: # TIG TIME OF IGNITION DP (B+28) CS.
027447,000064:
027448,000065: # DELLT4 DESIRED TIME OF FLIGHT DP (B+28) CS
027449,000066: # FROM RINIT TO RTARG.
027450,000067:
027451,000068: # RTARG RADIUS VECTOR OF TARGET POSITION VECTOR
027452,000069: # RADIUS VECTOR SCALED TO (B+29)METERS IF EARTH ORBIT
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Page 652
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027454,000071: # RADIUS VECTOR SCALED TO (B+27)METERS IF MOON ORBIT
027455,000072:
027456,000073: # OUTPUT **
027457,000074:
027458,000075: # HAPO APOGEE ALTITUDE
027459,000076: # HPER PERIGEE ALTITUDE
027460,000077: # VGDISP MAG. OF DELTAV FOR DISPLAY, SCALING B+7 M/CS EARTH
027461,000078: # MAG. OF DELTAV FOR DISPLAY, SCALING B+5 M/CS MOON
027462,000079: # MIDGIM MIDDLE GIMBAL ANGLE
027463,000080: # XDELVFLG RESETS XDELVFLG FOR LAMBERT VG COMPUTATIONS
027464,000081:
027465,000082: # ALARMS OR ABORTS NONE **
027466,000083:
027467,000084: # RESTARTS ARE VIA GROUP 4 **
027468,000085:
027469,000086: 35,2000 SETLOC GLM
027470,000087: 35,2000 BANK
027471,000088:
027472,000089: 35,2450 E7,1470 EBANK= SUBEXIT
027473,000090:
027474,000091: 35,2450 COUNT* $$/P31
027475,000092: 35,2450 02361 P31 TC P20FLGON
027476,000093: 35,2451 32025 CAF V06N33 # TIG
027477,000094: 35,2452 03712 TC VNPOOH
027478,000095: 35,2453 06037 TC INTPRET
027479,000096: 35,2454 71214 CLEAR DLOAD
027480,000097: 35,2455 00670 UPDATFLG
027481,000098: 35,2456 03442 TIG
027482,000099: 35,2457 34041 STCALL TDEC1 # INTEGRATE STATE VECTORS TO TIG
027483,000100: 35,2460 27057 LEMPREC
027484,000101: 35,2461 40375 VLOAD SETPD
027485,000102: 35,2462 00001 RATT
027486,000103: 35,2463 00001 0D
027487,000104: 35,2464 03642 STORE RTIG
027488,000105: 35,2465 26323 STOVL RINIT
027489,000106: 35,2466 00007 VATT
027490,000107: 35,2467 03650 STORE VTIG
027491,000108: 35,2470 16331 STODL VINIT
027492,000109: 35,2471 32420 P30ZERO
027493,000110: 35,2472 65206 PUSH PDDL # E4 AND NUMIT = 0
027494,000111: 35,2473 03452 DELLT4
027495,000112: 35,2474 66015 DAD SXA,1
027496,000113: 35,2475 03442 TIG
027497,000114: 35,2476 02776 RTX1
027498,000115: 35,2477 03631 STORE TPASS4
027499,000116: 35,2500 45134 SXA,2 CALL
027500,000117: 35,2501 02777 RTX2
027501,000118: 35,2502 22000 INITVEL
027502,000119: 35,2503 41575 VLOAD PUSH
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Page 653
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027504,000121: 35,2504 02366 DELVEET3
027505,000122: 35,2505 03656 STORE DELVSIN
027506,000123: 35,2506 43046 ABVAL CLEAR
027507,000124: 35,2507 01267 XDELVFLG
027508,000125: 35,2510 37664 STCALL VGDISP
027509,000126: 35,2511 15733 GET.LVC
027510,000127: 35,2512 63375 VLOAD PDVL
027511,000128: 35,2513 03642 RTIG
027512,000129: 35,2514 02337 VIPRIME
027513,000130: 35,2515 77624 CALL
027514,000131: 35,2516 46316 PERIAPO1
027515,000132: 35,2517 77624 CALL
027516,000133: 35,2520 46426 SHIFTR1
027517,000134: 35,2521 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027518,000135: 35,2522 45636 MAXCHK
027519,000136: 35,2523 16321 STODL HPER
027520,000137: 35,2524 00005 4D
027521,000138: 35,2525 77624 CALL
027522,000139: 35,2526 46426 SHIFTR1
027523,000140: 35,2527 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027524,000141: 35,2530 45636 MAXCHK
027525,000142: 35,2531 02317 STORE HAPO
027526,000143: 35,2532 77776 EXIT
027527,000144: 35,2533 33727 CAF V06N81 # DELVLVC
027528,000145: 35,2534 03712 TC VNPOOH
027529,000146: 35,2535 32026 CAF V06N42 # HAPO, HPER, VGDISP
027530,000147: 35,2536 03712 TC VNPOOH
027531,000148: 35,2537 06037 TC INTPRET
027532,000149: 35,2540 45014 REVN1645 SET CALL # TRKMKCNT, TTOGO, +MGA
027533,000150: 35,2541 01071 FINALFLG
027534,000151: 35,2542 73606 VN1645
027535,000152: 35,2543 77650 GOTO
027536,000153: 35,2544 72540 REVN1645
027537,000154:
End of include-file LAMBERT_AIMPOINT_GUIDANCE.agc. Parent file is MAIN.agc