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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014844,000002: ## Copyright: Public domain.
014845,000003: ## Filename: GIMBAL_LOCK_AVOIDANCE.agc
014846,000004: ## Purpose: A section of Luminary revision 98.
014847,000005: ## It is part of the reconstructed source code for the a
014848,000006: ## development version of the flight software for the Lunar
014849,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
014850,000008: ## The code has been recreated from a copy of Luminary 99
014851,000009: ## revision 001, using asterisks indicating changed lines in
014852,000010: ## the listing and Luminary Memo #85, which lists changes between
014853,000011: ## Luminary 98 and 99.
014854,000012: ## Reference: p. 364
014855,000013: ## Assembler: yaYUL
014856,000014: ## Contact: Ron Burkey <info@sandroid.org>.
014857,000015: ## Website: www.ibiblio.org/apollo/index.html
014858,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
014859,000017:
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Page 364
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014861,000019: 15,2050 BANK 15
014862,000020:
014863,000021: 22,2000 SETLOC KALCMON1
014864,000022: 22,2000 BANK
014865,000023:
014866,000024: # DETECTING GIMBAL LOCK
014867,000025: 22,2744 22,2744 LOCSKIRT EQUALS NOGIMLOC
014868,000026:
014869,000027: 22,2744 77614 NOGIMLOC SET
014870,000028: 22,2745 01074 CALCMAN3
014871,000029: 22,2746 70740 WCALC LXC,1 DLOAD*
014872,000030: 22,2747 01325 RATEINDX # CHOOSE THE DESIRED MANEUVER RATE
014873,000031: 22,2750 04772 ARATE,1 # FROM A LIST OF FOUR
014874,000032: 22,2751 45002 SR4 CALL # COMPUTE THE INCREMENTAL ROTATION MATRIX
014875,000033: 22,2752 44527 DELCOMP # DEL CORRESPONDING TO A 1 SEC ROTATION
014876,000034: # ABOUT COF
014877,000035: 22,2753 74343 DLOAD* VXSC
014878,000036: 22,2754 04772 ARATE,1
014879,000037: 22,2755 03271 COF
014880,000038: 22,2756 17326 STODL BRATE # COMPONENT MANEUVER RATES 45 DEG/SEC
014881,000039: 22,2757 03336 AM
014882,000040: 22,2760 55605 DMP DDV*
014883,000041: 22,2761 05002 ANGLTIME
014884,000042: 22,2762 04772 ARATE,1
014885,000043: 22,2763 77661 SR
014886,000044: 22,2764 20606 5
014887,000045: 22,2765 03334 STORE TM # MANEUVER EXECUTION TIME SCALED AS T2
014888,000046: 22,2766 77614 SETGO
014889,000047: 22,2767 01035 CALCMAN2 # 0(OFF) = CONTINUE MANEUVER
014890,000048: 22,2770 45010 NEWANGL +1 # 1(ON) = START MANEUVER
014891,000049:
014892,000050: # THE FOUR SELECTABLE FREE FALL MANEUVER RATES SELECTED BY
014893,000051: # LOADING RATEINDX WITH 0, 2, 4, 6, RESPECTIVELY
014894,000052:
014895,000053: 22,2771 00221 24255 ARATE 2DEC .0088888888 # = 0.2 DEG/SEC $ 22.5 DEG/SEC
014896,000054:
014897,000055: 22,2773 00554 02660 2DEC .0222222222 # = 0.5 DEG/SEC $ 22.5 DEG/SEC
014898,000056:
014899,000057: 22,2775 02660 13301 2DEC .0888888888 # = 2.0 DEG/SEC $ 22.5 DEG/SEC
014900,000058:
014901,000059: 22,2777 16161 30707 2DEC .4444444444 # = 10.0 DEG/SEC $ 22.5 DEG/SEC
014902,000060:
014903,000061: 22,3001 00003 04000 ANGLTIME 2DEC .0001907349 # = 100B-19 FUDGE FACTOR TO CONVERT
014904,000062: # MANEUVER ANGLE TO MANEUVER TIME
014905,000063:
014906,000064:
End of include-file GIMBAL_LOCK_AVOIDANCE.agc. Parent file is MAIN.agc