Source Code
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These source-code files are part of a reconstructed copy of LUM69 Revision 2, the
flown Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.
The reconstruction began with source code of Luminary 69 revision 0 previously
transcribed from a digitized copy of that program. The code was then updated
by back-porting the R-2 lunar potential model from previously-transcribed source
code of Luminary 99. These required changes were described in the original
Luminary memos 75 and 78. The reconstructed code 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 069 printout,
although the added code would likely have changed page numbers for a real LUM69
Revision 2 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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027166,000002: ## Copyright: Public domain.
027167,000003: ## Filename: P30,P37.agc
027168,000004: ## Purpose: A section of LUM69 revision 2.
027169,000005: ## It is part of the reconstructed source code for the flown
027170,000006: ## version of the flight software for the Lunar Module's (LM)
027171,000007: ## Apollo Guidance Computer (AGC) for Apollo 10. The code has
027172,000008: ## been recreated from a copy of Luminary revsion 069, using
027173,000009: ## changes present in Luminary 099 which were described in
027174,000010: ## Luminary memos 75 and 78. The code has been adapted such
027175,000011: ## that the resulting bugger words exactly match those specified
027176,000012: ## for LUM69 revision 2 in NASA drawing 2021152B, which gives
027177,000013: ## relatively high confidence that the reconstruction is correct.
027178,000014: ## Reference: pp. 624-627
027179,000015: ## Assembler: yaYUL
027180,000016: ## Contact: Ron Burkey <info@sandroid.org>.
027181,000017: ## Website: www.ibiblio.org/apollo/index.html
027182,000018: ## Mod history: 2019-07-27 MAS Created from Luminary 69.
027183,000019:
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Page 624
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027185,000021: # PROGRAM DESCRIPTION P30 DATE 3-6-67
027186,000022:
027187,000023: # MOD.1 BY RAMA AIYAWAR
027188,000024: # FUNCTIONAL DESCRIPTION
027189,000025: # ACCEPT ASTRONAUT INPUTS OF TIG,DELV(LV)
027190,000026: # CALL IMU STATUS CHECK ROUTINE (R02)
027191,000027: # DISPLAY TIME TO GO, APOGEE, PERIGEE, DELV(MAG), MGA AT IGN
027192,000028: # REQUEST BURN PROGRAM
027193,000029:
027194,000030: # CALLING SEQUENCE VIA JOB FROM V37
027195,000031:
027196,000032: # EXIT VIA V37 CALL OR TO GOTOPOOH (V34E)
027197,000033:
027198,000034: # SUBROUTINE CALLS - FLAGUP, PHASCHNG, BANKCALL, ENDOFJOB, GOFLASH, GOFLASHR
027199,000035: # GOPERF3R, INTPRET, BLANKET, GOTOPOOH, R02BOTH, S30.1,
027200,000036: # TTG/N35, MIDGIM, DISPMGA
027201,000037:
027202,000038: # ERASABLE INITIALIZATION - STATE VECTOR
027203,000039:
027204,000040: # OUTPUT-RINIT, VINIT, +MGA, VTIG, RTIG, DELVSIN, DELVSAB, DELVSLV, HAPO,
027205,000041: # HPER, TTOGO
027206,000042:
027207,000043: # DEBRIS- A,L, MPAC, PUSHLIST
027208,000044:
027209,000045: 32,2772 BANK 32
027210,000046: 35,2000 SETLOC P30S
027211,000047: 35,2000 BANK
027212,000048: 35,2000 E4,1656 EBANK= +MGA
027213,000049: 35,2000 COUNT* $$/P30
027214,000050: 35,2000 05504 P30 TC UPFLAG # SET UPDATE FLAG
027215,000051: 35,2001 00027 ADRES UPDATFLG
027216,000052: 35,2002 05504 TC UPFLAG # SET TRACK FLAG
027217,000053: 35,2003 00031 ADRES TRACKFLG
027218,000054:
027219,000055: 35,2004 32025 P30N33 CAF V06N33 # T OF IGN
027220,000056: 35,2005 03651 TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
027221,000057:
027222,000058: 35,2006 33666 CAF V06N81 # DISPLAY DELTA V (LV)
027223,000059: 35,2007 03651 TC VNPOOH # REDISPLAY ON RECYCLE
027224,000060:
027225,000061: 35,2010 05516 TC DOWNFLAG # RESET UPDATE FLAG
027226,000062: 35,2011 00027 ADRES UPDATFLG
027227,000063: 35,2012 06036 TC INTPRET
027228,000064: 35,2013 77624 CALL
027229,000065: 35,2014 70000 S30.1
027230,000066: 35,2015 77414 SET EXIT
027231,000067: 35,2016 00470 UPDATFLG
027232,000068: 35,2017 32026 PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE ,DELTA V
027233,000069: 35,2020 03651 TC VNPOOH
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Page 625
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027235,000071:
027236,000072: 35,2021 06036 TC INTPRET
027237,000073: 35,2022 77614 SETGO
027238,000074: 35,2023 01027 XDELVFLG # FOR P40'S: EXTERNAL DELTA-V GUIDANCE.
027239,000075: 35,2024 72504 REVN1645 # TRKMKCNT, TGO, +MGA DISPLAY
027240,000076:
027241,000077: 35,2025 01441 V06N33 VN 0633
027242,000078: 35,2026 01452 V06N42 VN 0642
027243,000079:
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Page 626
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027245,000081: # PROGRAM DESCRIPTION S30.1 DATE 9NOV66
027246,000082:
027247,000083: # MOD NO 1 LOG SECTION P30,P37
027248,000084: # MOD BY RAMA AIYAWAR **
027249,000085:
027250,000086: # FUNCTIONAL DESCRIPTION
027251,000087: # BASED ON STORED TARGET PARAMETERS(R OF IGNITION (RTIG), V OF
027252,000088: # IGNITION(VTIG), TIME OF IGNITION (TIG)),COMPUTE PERIGEE ALTITUDE
027253,000089: # APOGEE ALTITUDE AND DELTAV REQUIRED(DELVSIN).
027254,000090:
027255,000091: # CALLING SEQUENCE
027256,000092: # L CALL
027257,000093: # L+1 S30.1
027258,000094:
027259,000095: # NORMAL EXIT MODE
027260,000096: # AT L+2 OR CALLING SEQUENCE (GOTO L+2)
027261,000097:
027262,000098: # SUBROUTINES CALLED
027263,000099: # LEMPREC
027264,000100: # PERIAPO
027265,000101:
027266,000102: # ALARM OR ABORT EXIT MODES
027267,000103: # NONE
027268,000104:
027269,000105: # ERASABLE INITIALIZATION REQUIRED
027270,000106: # TIG TIME OF IGNITION DP B28CS
027271,000107: # DELVSLV SPECIFIED DELTA-V IN LOCAL VERT.
027272,000108: # COORDS. OF ACTIVE VEHICLE AT
027273,000109: # TIME OF IGNITION VECTOR B+7 METERS/CS
027274,000110:
027275,000111: # OUTPUT
027276,000112: # RTIG POSITION AT TIG VECTOR B+29 METERS
027277,000113: # VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
027278,000114: # PDL 4D APOGEE ALTITUDE DP B+29 M , B+27 METERS.
027279,000115: # HAPO APOGEE ALTITUDE DP B+29 METERS
027280,000116: # PDL 8D PERIGEE ALTITUDE DP B+29 M , B+27 METERS.
027281,000117: # HPER PERIGEE ALTITUDE DP B+29 METERS
027282,000118: # DELVSIN SPECIFIED DELTA-V IN INERTIAL
027283,000119: # COORD. OF ACTIVE VEHICLE AT
027284,000120: # TIME OF IGNITION VECTOR B+7 METERS/CS
027285,000121: # DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
027286,000122:
027287,000123: # DEBRIS QTEMP TEMP.ERASABLE
027288,000124: # QPRET, MPAC
027289,000125: # PUSHLIST
027290,000126:
027291,000127: 34,2000 SETLOC P30S1
027292,000128: 34,2000 BANK
027293,000129:
027294,000130: 34,2000 COUNT* $$/S30S
027295,000131:
027296,000132: 34,2000 71220 S30.1 STQ DLOAD
027297,000133: 34,2001 03630 QTEMP
027298,000134: 34,2002 03440 TIG # TIME IGNITION SCALED AT 2(+28)CS
027299,000135: 34,2003 34041 STCALL TDEC1
027300,000136: 34,2004 27057 LEMPREC # ENCKE ROUTINE FOR LEM
027301,000137:
027302,000138: 34,2005 67175 VLOAD SXA,2
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Page 627
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027304,000140: 34,2006 00001 RATT
027305,000141: 34,2007 03376 RTX2
027306,000142: 34,2010 03640 STORE RTIG # RADIUS VECTOR AT IGNITION TIME
027307,000143: 34,2011 57456 UNIT VCOMP
027308,000144: 34,2012 27654 STOVL DELVSIN # ZRF/LV IN DELVSIN SCALED AT 2
027309,000145: 34,2013 00007 VATT # VELOCITY VECTOR AT TIG, SCALED 2(7) M/CS
027310,000146: 34,2014 03646 STORE VTIG
027311,000147: 34,2015 53435 VXV UNIT
027312,000148: 34,2016 03640 RTIG
027313,000149: 34,2017 66001 SETPD SXA,1
027314,000150: 34,2020 00001 0
027315,000151: 34,2021 03375 RTX1
027316,000152: 34,2022 47206 PUSH VXV # YRF/LV PDL 0 SCALED AT 2
027317,000153: 34,2023 03654 DELVSIN
027318,000154: 34,2024 63372 VSL1 PDVL
027319,000155: 34,2025 63315 PDVL PDVL # YRF/LV PDL 6 SCALED AT 2
027320,000156: 34,2026 03654 DELVSIN # ZRF/LV PDL 12D SCALED AT 2
027321,000157: 34,2027 03432 DELVSLV
027322,000158: 34,2030 76505 VXM VSL1
027323,000159: 34,2031 00001 0
027324,000160: 34,2032 03654 STORE DELVSIN # DELTAV IN INERT. COOR. SCALED TO B+7M/CS
027325,000161: 34,2033 77646 ABVAL
027326,000162: 34,2034 27662 STOVL DELVSAB # DELTA V MAG.
027327,000163: 34,2035 03640 RTIG # (FOR PERIAPO)
027328,000164: 34,2036 53315 PDVL VAD # VREQUIRED = VTIG + DELVSIN (FOR PERIAPO)
027329,000165: 34,2037 03646 VTIG
027330,000166: 34,2040 03654 DELVSIN
027331,000167: 34,2041 77624 CALL
027332,000168: 34,2042 46277 PERIAPO1
027333,000169: 34,2043 77624 CALL
027334,000170: 34,2044 46407 SHIFTR1 # RESCALE IF NEEDED
027335,000171: 34,2045 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027336,000172: 34,2046 45636 MAXCHK
027337,000173: 34,2047 16325 STODL HPER # PERIGEE ALT 2(29) METERS, FOR DISPLAY
027338,000174: 34,2050 00005 4D
027339,000175: 34,2051 77624 CALL
027340,000176: 34,2052 46407 SHIFTR1 # RESCALE IF NEEDED
027341,000177: 34,2053 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
027342,000178: 34,2054 45636 MAXCHK
027343,000179: 34,2055 36323 STCALL HAPO # APOGEE ALT 2(29) METERS, FOR DISPLAY
027344,000180: 34,2056 03630 QTEMP
027345,000181:
027346,000182:
End of include-file P30,P37.agc. Parent file is MAIN.agc