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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025818,000002: ## Copyright: Public domain.
025819,000003: ## Filename: P30,P37.agc
025820,000004: ## Purpose: A section of Luminary revision 98.
025821,000005: ## It is part of the reconstructed source code for the a
025822,000006: ## development version of the flight software for the Lunar
025823,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
025824,000008: ## The code has been recreated from a copy of Luminary 99
025825,000009: ## revision 001, using asterisks indicating changed lines in
025826,000010: ## the listing and Luminary Memo #85, which lists changes between
025827,000011: ## Luminary 98 and 99.
025828,000012: ## Reference: pp. 614-617
025829,000013: ## Assembler: yaYUL
025830,000014: ## Contact: Ron Burkey <info@sandroid.org>.
025831,000015: ## Website: www.ibiblio.org/apollo/index.html
025832,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
025833,000017:
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Page 614
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025835,000019: # PROGRAM DESCRIPTION P30 DATE 3-6-67
025836,000020:
025837,000021: # MOD.1 BY RAMA AIYAWAR
025838,000022:
025839,000023: # FUNCTIONAL DESCRIPTION
025840,000024: # ACCEPT ASTRONAUT INPUTS OF TIG,DELV(LV)
025841,000025: # CALL IMU STATUS CHECK ROUTINE (R02)
025842,000026: # DISPLAY TIME TO GO, APOGEE, PERIGEE, DELV(MAG), MGA AT IGN
025843,000027: # REQUEST BURN PROGRAM
025844,000028:
025845,000029: # CALLING SEQUENCE VIA JOB FROM V37
025846,000030:
025847,000031: # EXIT VIA V37 CALL OR TO GOTOPOOH (V34E)
025848,000032:
025849,000033: # SUBROUTINE CALLS - FLAGUP, PHASCHNG, BANKCALL, ENDOFJOB, GOFLASH, GOFLASHR
025850,000034: # GOPERF3R, INTPRET, BLANKET, GOTOPOOH, R02BOTH, S30.1,
025851,000035: # TTG/N35, MIDGIM, DISPMGA
025852,000036:
025853,000037: # ERASABLE INITIALIZATION - STATE VECTOR
025854,000038:
025855,000039: # OUTPUT - RINIT, VINIT, +MGA, VTIG, RTIG, DELVSIN, DELVSAB, DELVSLV, HAPO,
025856,000040: # HPER, TTOGO
025857,000041:
025858,000042: # DEBRIS - A, L, MPAC, PUSHLIST
025859,000043:
025860,000044: 32,2776 BANK 32
025861,000045: 35,2000 SETLOC P30S
025862,000046: 35,2000 BANK
025863,000047: 35,2000 E4,1652 EBANK= +MGA
025864,000048: 35,2000 COUNT* $$/P30
025865,000049: 35,2000 05504 P30 TC UPFLAG # SET UPDATE FLAG
025866,000050: 35,2001 00027 ADRES UPDATFLG
025867,000051: 35,2002 05504 TC UPFLAG # SET TRACK FLAG
025868,000052: 35,2003 00031 ADRES TRACKFLG
025869,000053:
025870,000054: 35,2004 32025 P30N33 CAF V06N33 # T OF IGN
025871,000055: 35,2005 03712 TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
025872,000056:
025873,000057: 35,2006 33727 CAF V06N81 # DISPLAY DELTA V (LV)
025874,000058: 35,2007 03712 TC VNPOOH # REDISPLAY ON RECYCLE
025875,000059:
025876,000060: 35,2010 05516 TC DOWNFLAG # RESET UPDATE FLAG
025877,000061: 35,2011 00027 ADRES UPDATFLG
025878,000062: 35,2012 06037 TC INTPRET
025879,000063: 35,2013 77624 CALL
025880,000064: 35,2014 70000 S30.1
025881,000065: 35,2015 77414 SET EXIT
025882,000066: 35,2016 00470 UPDATFLG
025883,000067: 35,2017 32026 PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE,DELTA V
025884,000068: 35,2020 03712 TC VNPOOH
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Page 615
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025886,000070:
025887,000071: 35,2021 06037 TC INTPRET
025888,000072: 35,2022 77614 SETGO
025889,000073: 35,2023 01027 XDELVFLG # FOR P40'S: EXTERNAL DELTA-V GUIDANCE.
025890,000074: 35,2024 72540 REVN1645 # TRKMKCNT, TGO, +MGA DISPLAY
025891,000075:
025892,000076: 35,2025 01441 V06N33 VN 0633
025893,000077: 35,2026 01452 V06N42 VN 0642
025894,000078:
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Page 616
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025896,000080: # PROGRAM DESCRIPTION S30.1 DATE 9NOV66
025897,000081: # MOD NO 1 LOG SECTION P30,P37
025898,000082: # MOD BY RAMA AIYAWAR **
025899,000083:
025900,000084: # FUNCTIONAL DESCRIPTION
025901,000085: # BASED ON STORED TARGET PARAMETERS (R OF IGNITION (RTIG), V OF
025902,000086: # IGNITION (VTIG), TIME OF IGNITION (TIG)), COMPUTE PERIGEE ALTITUDE
025903,000087: # APOGEE ALTITUDE AND DELTAV REQUIRED (DELVSIN).
025904,000088:
025905,000089: # CALLING SEQUENCE
025906,000090: # L CALL
025907,000091: # L+1 S30.1
025908,000092:
025909,000093: # NORMAL EXIT MODE
025910,000094: # AT L+2 OR CALLING SEQUENCE (GOTO L+2)
025911,000095:
025912,000096: # SUBROUTINES CALLED
025913,000097: # LEMPREC
025914,000098: # PERIAPO
025915,000099:
025916,000100: # ALARM OR ABORT EXIT MODES
025917,000101: # NONE
025918,000102:
025919,000103: # ERASABLE INITIALIZATION REQUIRED
025920,000104: # TIG TIME OF IGNITION DP B28CS
025921,000105: # DELVSLV SPECIFIED DELTA-V IN LOCAL VERT.
025922,000106: # COORDS. OF ACTIVE VEHICLE AT
025923,000107: # TIME OF IGNITION VECTOR B+7 METERS/CS
025924,000108:
025925,000109: # OUTPUT
025926,000110: # RTIG POSITION AT TIG VECTOR B+29 METERS
025927,000111: # VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
025928,000112: # PDL 4D APOGEE ALTITUDE DP B+29 M, B+27 METERS.
025929,000113: # HAPO APOGEE ALTITUDE DP B+29 METERS
025930,000114: # PDL 8D PERIGEE ALTITUDE DP B+29 M, B+27 METERS.
025931,000115: # HPER PERIGEE ALTITUDE DP B+29 METERS
025932,000116: # DELVSIN SPECIFIED DELTA-V IN INERTIAL
025933,000117: # COORD. OF ACTIVE VEHICLE AT
025934,000118: # TIME OF IGNITION VECTOR B+7 METERS/CS
025935,000119: # DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
025936,000120:
025937,000121: # DEBRIS QTEMP TEMP.ERASABLE
025938,000122: # QPRET, MPAC
025939,000123: # PUSHLIST
025940,000124:
025941,000125: 34,2000 SETLOC P30S1
025942,000126: 34,2000 BANK
025943,000127:
025944,000128: 34,2000 COUNT* $$/S30S
025945,000129:
025946,000130: 34,2000 71220 S30.1 STQ DLOAD
025947,000131: 34,2001 03632 QTEMP
025948,000132: 34,2002 03442 TIG # TIME IGNITION SCALED AT 2(+28)CS
025949,000133: 34,2003 34041 STCALL TDEC1
025950,000134: 34,2004 27057 LEMPREC # ENCKE ROUTINE FOR LEM
025951,000135:
025952,000136: 34,2005 67175 VLOAD SXA,2
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Page 617
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025954,000138: 34,2006 00001 RATT
025955,000139: 34,2007 02777 RTX2
025956,000140: 34,2010 03642 STORE RTIG # RADIUS VECTOR AT IGNITION TIME
025957,000141: 34,2011 57456 UNIT VCOMP
025958,000142: 34,2012 27656 STOVL DELVSIN # ZRF/LV IN DELVSIN SCALED AT 2
025959,000143: 34,2013 00007 VATT # VELOCITY VECTOR AT TIG, SCALED 2(7) M/CS
025960,000144: 34,2014 03650 STORE VTIG
025961,000145: 34,2015 53435 VXV UNIT
025962,000146: 34,2016 03642 RTIG
025963,000147: 34,2017 66001 SETPD SXA,1
025964,000148: 34,2020 00001 0
025965,000149: 34,2021 02776 RTX1
025966,000150: 34,2022 47206 PUSH VXV # YRF/LV PDL 0 SCALED AT 2
025967,000151: 34,2023 03656 DELVSIN
025968,000152: 34,2024 63372 VSL1 PDVL
025969,000153: 34,2025 63315 PDVL PDVL # YRF/LV PDL 6 SCALED AT 2
025970,000154: 34,2026 03656 DELVSIN # ZRF/LV PDL 12D SCALED AT 2
025971,000155: 34,2027 03434 DELVSLV
025972,000156: 34,2030 76505 VXM VSL1
025973,000157: 34,2031 00001 0
025974,000158: 34,2032 03656 STORE DELVSIN # DELTAV IN INERT. COOR. SCALED TO B+7M/CS
025975,000159: 34,2033 77646 ABVAL
025976,000160: 34,2034 27664 STOVL DELVSAB # DELTA V MAG.
025977,000161: 34,2035 03642 RTIG # (FOR PERIAPO)
025978,000162: 34,2036 53315 PDVL VAD # VREQUIRED = VTIG + DELVSIN (FOR PERIAPO)
025979,000163: 34,2037 03650 VTIG
025980,000164: 34,2040 03656 DELVSIN
025981,000165: 34,2041 77624 CALL
025982,000166: 34,2042 46316 PERIAPO1
025983,000167: 34,2043 77624 CALL
025984,000168: 34,2044 46426 SHIFTR1 # RESCALE IF NEEDED
025985,000169: 34,2045 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
025986,000170: 34,2046 45636 MAXCHK
025987,000171: 34,2047 16321 STODL HPER # PERIGEE ALT 2(29) METERS, FOR DISPLAY
025988,000172: 34,2050 00005 4D
025989,000173: 34,2051 77624 CALL
025990,000174: 34,2052 46426 SHIFTR1 # RESCALE IF NEEDED
025991,000175: 34,2053 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
025992,000176: 34,2054 45636 MAXCHK
025993,000177: 34,2055 36317 STCALL HAPO # APOGEE ALT 2(29) METERS, FOR DISPLAY
025994,000178: 34,2056 03632 QTEMP
025995,000179:
025996,000180:
End of include-file P30,P37.agc. Parent file is MAIN.agc