Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
original release 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 memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
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 97 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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025928,000002: ## Copyright: Public domain.
025929,000003: ## Filename: P30,P37.agc
025930,000004: ## Purpose: A section of Luminary revision 97.
025931,000005: ## It is part of the reconstructed source code for the
025932,000006: ## original release of the flight software for the Lunar
025933,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
025934,000008: ## The code has been recreated from a copy of Luminary 99
025935,000009: ## revision 001, using asterisks indicating changed lines in
025936,000010: ## the listing and Luminary Memos #83 and #85, which list
025937,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
025938,000012: ## code has been adapted such that the resulting bugger words
025939,000013: ## exactly match those specified for Luminary 97 in NASA drawing
025940,000014: ## 2021152D, which gives relatively high confidence that the
025941,000015: ## reconstruction is correct.
025942,000016: ## Reference: pp. 614-617
025943,000017: ## Assembler: yaYUL
025944,000018: ## Contact: Ron Burkey <info@sandroid.org>.
025945,000019: ## Website: www.ibiblio.org/apollo/index.html
025946,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
025947,000021:
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Page 614
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025949,000023: # PROGRAM DESCRIPTION P30 DATE 3-6-67
025950,000024:
025951,000025: # MOD.1 BY RAMA AIYAWAR
025952,000026:
025953,000027: # FUNCTIONAL DESCRIPTION
025954,000028: # ACCEPT ASTRONAUT INPUTS OF TIG,DELV(LV)
025955,000029: # CALL IMU STATUS CHECK ROUTINE (R02)
025956,000030: # DISPLAY TIME TO GO, APOGEE, PERIGEE, DELV(MAG), MGA AT IGN
025957,000031: # REQUEST BURN PROGRAM
025958,000032:
025959,000033: # CALLING SEQUENCE VIA JOB FROM V37
025960,000034:
025961,000035: # EXIT VIA V37 CALL OR TO GOTOPOOH (V34E)
025962,000036:
025963,000037: # SUBROUTINE CALLS - FLAGUP, PHASCHNG, BANKCALL, ENDOFJOB, GOFLASH, GOFLASHR
025964,000038: # GOPERF3R, INTPRET, BLANKET, GOTOPOOH, R02BOTH, S30.1,
025965,000039: # TTG/N35, MIDGIM, DISPMGA
025966,000040:
025967,000041: # ERASABLE INITIALIZATION - STATE VECTOR
025968,000042:
025969,000043: # OUTPUT - RINIT, VINIT, +MGA, VTIG, RTIG, DELVSIN, DELVSAB, DELVSLV, HAPO,
025970,000044: # HPER, TTOGO
025971,000045:
025972,000046: # DEBRIS - A, L, MPAC, PUSHLIST
025973,000047:
025974,000048: 32,2776 BANK 32
025975,000049: 35,2000 SETLOC P30S
025976,000050: 35,2000 BANK
025977,000051: 35,2000 E4,1652 EBANK= +MGA
025978,000052: 35,2000 COUNT* $$/P30
025979,000053: 35,2000 05504 P30 TC UPFLAG # SET UPDATE FLAG
025980,000054: 35,2001 00027 ADRES UPDATFLG
025981,000055: 35,2002 05504 TC UPFLAG # SET TRACK FLAG
025982,000056: 35,2003 00031 ADRES TRACKFLG
025983,000057:
025984,000058: 35,2004 32025 P30N33 CAF V06N33 # T OF IGN
025985,000059: 35,2005 03712 TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
025986,000060:
025987,000061: 35,2006 33727 CAF V06N81 # DISPLAY DELTA V (LV)
025988,000062: 35,2007 03712 TC VNPOOH # REDISPLAY ON RECYCLE
025989,000063:
025990,000064: 35,2010 05516 TC DOWNFLAG # RESET UPDATE FLAG
025991,000065: 35,2011 00027 ADRES UPDATFLG
025992,000066: 35,2012 06037 TC INTPRET
025993,000067: 35,2013 77624 CALL
025994,000068: 35,2014 70000 S30.1
025995,000069: 35,2015 77414 SET EXIT
025996,000070: 35,2016 00470 UPDATFLG
025997,000071: 35,2017 32026 PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE,DELTA V
025998,000072: 35,2020 03712 TC VNPOOH
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Page 615
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026000,000074:
026001,000075: 35,2021 06037 TC INTPRET
026002,000076: 35,2022 77614 SETGO
026003,000077: 35,2023 01027 XDELVFLG # FOR P40'S: EXTERNAL DELTA-V GUIDANCE.
026004,000078: 35,2024 72540 REVN1645 # TRKMKCNT, TGO, +MGA DISPLAY
026005,000079:
026006,000080: 35,2025 01441 V06N33 VN 0633
026007,000081: 35,2026 01452 V06N42 VN 0642
026008,000082:
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Page 616
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026010,000084: # PROGRAM DESCRIPTION S30.1 DATE 9NOV66
026011,000085: # MOD NO 1 LOG SECTION P30,P37
026012,000086: # MOD BY RAMA AIYAWAR **
026013,000087:
026014,000088: # FUNCTIONAL DESCRIPTION
026015,000089: # BASED ON STORED TARGET PARAMETERS (R OF IGNITION (RTIG), V OF
026016,000090: # IGNITION (VTIG), TIME OF IGNITION (TIG)), COMPUTE PERIGEE ALTITUDE
026017,000091: # APOGEE ALTITUDE AND DELTAV REQUIRED (DELVSIN).
026018,000092:
026019,000093: # CALLING SEQUENCE
026020,000094: # L CALL
026021,000095: # L+1 S30.1
026022,000096:
026023,000097: # NORMAL EXIT MODE
026024,000098: # AT L+2 OR CALLING SEQUENCE (GOTO L+2)
026025,000099:
026026,000100: # SUBROUTINES CALLED
026027,000101: # LEMPREC
026028,000102: # PERIAPO
026029,000103:
026030,000104: # ALARM OR ABORT EXIT MODES
026031,000105: # NONE
026032,000106:
026033,000107: # ERASABLE INITIALIZATION REQUIRED
026034,000108: # TIG TIME OF IGNITION DP B28CS
026035,000109: # DELVSLV SPECIFIED DELTA-V IN LOCAL VERT.
026036,000110: # COORDS. OF ACTIVE VEHICLE AT
026037,000111: # TIME OF IGNITION VECTOR B+7 METERS/CS
026038,000112:
026039,000113: # OUTPUT
026040,000114: # RTIG POSITION AT TIG VECTOR B+29 METERS
026041,000115: # VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
026042,000116: # PDL 4D APOGEE ALTITUDE DP B+29 M, B+27 METERS.
026043,000117: # HAPO APOGEE ALTITUDE DP B+29 METERS
026044,000118: # PDL 8D PERIGEE ALTITUDE DP B+29 M, B+27 METERS.
026045,000119: # HPER PERIGEE ALTITUDE DP B+29 METERS
026046,000120: # DELVSIN SPECIFIED DELTA-V IN INERTIAL
026047,000121: # COORD. OF ACTIVE VEHICLE AT
026048,000122: # TIME OF IGNITION VECTOR B+7 METERS/CS
026049,000123: # DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
026050,000124:
026051,000125: # DEBRIS QTEMP TEMP.ERASABLE
026052,000126: # QPRET, MPAC
026053,000127: # PUSHLIST
026054,000128:
026055,000129: 34,2000 SETLOC P30S1
026056,000130: 34,2000 BANK
026057,000131:
026058,000132: 34,2000 COUNT* $$/S30S
026059,000133:
026060,000134: 34,2000 71220 S30.1 STQ DLOAD
026061,000135: 34,2001 03632 QTEMP
026062,000136: 34,2002 03442 TIG # TIME IGNITION SCALED AT 2(+28)CS
026063,000137: 34,2003 34041 STCALL TDEC1
026064,000138: 34,2004 27057 LEMPREC # ENCKE ROUTINE FOR LEM
026065,000139:
026066,000140: 34,2005 67175 VLOAD SXA,2
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Page 617
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026068,000142: 34,2006 00001 RATT
026069,000143: 34,2007 02777 RTX2
026070,000144: 34,2010 03642 STORE RTIG # RADIUS VECTOR AT IGNITION TIME
026071,000145: 34,2011 57456 UNIT VCOMP
026072,000146: 34,2012 27656 STOVL DELVSIN # ZRF/LV IN DELVSIN SCALED AT 2
026073,000147: 34,2013 00007 VATT # VELOCITY VECTOR AT TIG, SCALED 2(7) M/CS
026074,000148: 34,2014 03650 STORE VTIG
026075,000149: 34,2015 53435 VXV UNIT
026076,000150: 34,2016 03642 RTIG
026077,000151: 34,2017 66001 SETPD SXA,1
026078,000152: 34,2020 00001 0
026079,000153: 34,2021 02776 RTX1
026080,000154: 34,2022 47206 PUSH VXV # YRF/LV PDL 0 SCALED AT 2
026081,000155: 34,2023 03656 DELVSIN
026082,000156: 34,2024 63372 VSL1 PDVL
026083,000157: 34,2025 63315 PDVL PDVL # YRF/LV PDL 6 SCALED AT 2
026084,000158: 34,2026 03656 DELVSIN # ZRF/LV PDL 12D SCALED AT 2
026085,000159: 34,2027 03434 DELVSLV
026086,000160: 34,2030 76505 VXM VSL1
026087,000161: 34,2031 00001 0
026088,000162: 34,2032 03656 STORE DELVSIN # DELTAV IN INERT. COOR. SCALED TO B+7M/CS
026089,000163: 34,2033 77646 ABVAL
026090,000164: 34,2034 27664 STOVL DELVSAB # DELTA V MAG.
026091,000165: 34,2035 03642 RTIG # (FOR PERIAPO)
026092,000166: 34,2036 53315 PDVL VAD # VREQUIRED = VTIG + DELVSIN (FOR PERIAPO)
026093,000167: 34,2037 03650 VTIG
026094,000168: 34,2040 03656 DELVSIN
026095,000169: 34,2041 77624 CALL
026096,000170: 34,2042 46316 PERIAPO1
026097,000171: 34,2043 77624 CALL
026098,000172: 34,2044 46426 SHIFTR1 # RESCALE IF NEEDED
026099,000173: 34,2045 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
026100,000174: 34,2046 45636 MAXCHK
026101,000175: 34,2047 16321 STODL HPER # PERIGEE ALT 2(29) METERS, FOR DISPLAY
026102,000176: 34,2050 00005 4D
026103,000177: 34,2051 77624 CALL
026104,000178: 34,2052 46426 SHIFTR1 # RESCALE IF NEEDED
026105,000179: 34,2053 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
026106,000180: 34,2054 45636 MAXCHK
026107,000181: 34,2055 36317 STCALL HAPO # APOGEE ALT 2(29) METERS, FOR DISPLAY
026108,000182: 34,2056 03632 QTEMP
026109,000183:
026110,000184:
End of include-file P30,P37.agc. Parent file is MAIN.agc