GAP: ASSEMBLE REVISION 131 OF AGC PROGRAM LUMINARY BY NASA 2021112-091 17:53 DEC. 19, 1969Note that the date is the date the printout was made, not the date on which the program revision was released, although these happen to be very close together.
Source Code
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This source code is very close to the Apollo Guidance Computer software for the
Apollo 13 Lunar module. This revision of the Luminary 131 program is from December
of 1969, whereas there was a later revision in January of 1970, and still another
revision in February, which is the code that flew on the mission.
As far as this transcription is concerned, it was originally from a copy made in 1991 of
a printout from the collection of AGC developer Don Eyles for collector David Craig.
It was subsequently scanned by Gary Neff, reprocessed for online
presentation at the now-discontinued History of Recent Science and Technology (HRST) website
of MIT's Dibner Institute (the full-quality scans being discarded in the process),
and finally transcribed by Ron Burkey for the Virtual AGC Project. Although a
high-quality replacement scan for a completely illegible page was later provided by Gary
Neff, the reduced legibility of the reprocessed HRST posting nevertheless caused many
errors to be introduced into the transcription. Accordingly, a second scan of the same physical
printout was made in 2017 for the Virtual AGC Project's collection at the Internet Archive,
and used to correct the transcription errors. All of the scanned materials mentioned,
as well as other Luminary 131 related material, are available online.
Don Eyles apprently made additional hand-written notes in printout between 1991 and 2017,
so the two scans are not identical in that respect. The page-headings in the printout read, in part:GAP: ASSEMBLE REVISION 131 OF AGC PROGRAM LUMINARY BY NASA 2021112-091 17:53 DEC. 19, 1969Note that the date is the date the printout was made, not the date on which the program revision was released, although these happen to be very close together. |
026324,000002: ## Copyright: Public domain.
026325,000003: ## Filename: P30_P37.agc
026326,000004: ## Purpose: A section of Luminary 1C, revision 131.
026327,000005: ## It is part of the source code for the Lunar Module's (LM)
026328,000006: ## Apollo Guidance Computer (AGC) for Apollo 13.
026329,000007: ## This file is intended to be a faithful transcription, except
026330,000008: ## that the code format has been changed to conform to the
026331,000009: ## requirements of the yaYUL assembler rather than the
026332,000010: ## original YUL assembler.
026333,000011: ## Reference: pp. 619-622
026334,000012: ## Contact: Ron Burkey <info@sandroid.org>.
026335,000013: ## Website: www.ibiblio.org/apollo
026336,000014: ## Mod history: 05/19/03 RSB. Began transcribing.
026337,000015: ## 2017-01-06 RSB Page numbers now agree with those on the
026338,000016: ## original harcopy, as opposed to the PDF page
026339,000017: ## numbers in 1701.pdf.
026340,000018: ## 2017-02-24 RSB Proofed comment text using octopus/ProoferComments.
026341,000019: ## 2017-03-09 RSB Fixed VNP00H to VNPOOH.
026342,000020: ## 2017-03-14 RSB Comment-text fixes noted in proofing Luminary 116.
026343,000021:
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Page 619 |
026345,000023: # PROGRAM DESCRIPTION P30 DATE 3-6-67
026346,000024: # MOD.1 BY RAMA AIYAWAR
026347,000025:
026348,000026: # FUNCTIONAL DESCRIPTION
026349,000027: # ACCEPT ASTRONAUT INPUTS OF TIG,DELV(LV)
026350,000028: # CALL IMU STATUS CHECK ROUTINE (R02)
026351,000029: # DISPLAY TIME TO GO, APOGEE, PERIGEE, DELV(MAG), MGA AT IGN
026352,000030: # REQUEST BURN PROGRAM
026353,000031:
026354,000032: # CALLING SEQUENCE VIA JOB FROM V37
026355,000033:
026356,000034: # EXIT VIA V37 CALL OR TO GOTOPOOH (V34E)
026357,000035:
026358,000036: # SUBROUTINE CALLS - FLAGUP, PHASCHNG, BANKCALL, ENDOFJOB, GOFLASH, GOFLASHR
026359,000037: # GOPERF3R, INTPRET, BLANKET, GOTOPOOH, R02BOTH, S30.1,
026360,000038: # TTG/N35, MIDGIM, DISPMGA
026361,000039:
026362,000040: # ERASABLE INITIALIZATION - STATE VECTOR
026363,000041:
026364,000042: # OUTPUT - RINIT, VINIT, +MGA, VTIG, RTIG, DELVSIN, DELVSAB, DELVSLV, HAPO,
026365,000043: # HPER, TTOGO
026366,000044:
026367,000045: # DEBRIS - A, L, MPAC, PUSHLIST
026368,000046:
026369,000047: 32,3000 BANK 32
026370,000048: 35,2000 SETLOC P30S
026371,000049: 35,2000 BANK
026372,000050: 35,2000 E4,1652 EBANK= +MGA
026373,000051: 35,2000 COUNT* $$/P30
026374,000052: 35,2000 05504 P30 TC UPFLAG # SET UPDATE FLAG
026375,000053: 35,2001 00027 ADRES UPDATFLG
026376,000054: 35,2002 05504 TC UPFLAG # SET TRACK FLAG
026377,000055: 35,2003 00031 ADRES TRACKFLG
026378,000056:
026379,000057: 35,2004 32032 P30N33 CAF V06N33 # T OF IGN
026380,000058: 35,2005 03621 TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
026381,000059:
026382,000060: 35,2006 33636 CAF V06N81 # DISPLAY DELTA V (LV)
026383,000061: 35,2007 03621 TC VNPOOH # REDISPLAY ON RECYCLE
026384,000062:
026385,000063: 35,2010 05516 TC DOWNFLAG # RESET UPDATE FLAG
026386,000064: 35,2011 00027 ADRES UPDATFLG
026387,000065: 35,2012 06042 TC INTPRET
026388,000066: 35,2013 77624 CALL
026389,000067: 35,2014 70000 S30.1
026390,000068: 35,2015 43014 SET SET
026391,000069: 35,2016 00470 UPDATFLG
026392,000070: 35,2017 01067 XDELVFLG
026393,000071: 35,2020 77776 EXIT
026394,000072: 35,2021 32033 PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE,DELTA V
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Page 620 |
026396,000074: 35,2022 03621 TC VNPOOH
026397,000075:
026398,000076: 35,2023 06042 TC INTPRET
026399,000077: 35,2024 77614 SET
026400,000078: 35,2025 01071 FINALFLG
026401,000079: 35,2026 77624 REVN1645 CALL
026402,000080: 35,2027 73515 VN1645
026403,000081: 35,2030 77650 GOTO # COMES HERE ON RECYCLE RESPONSE
026404,000082: 35,2031 72026 REVN1645
026405,000083:
026406,000084: 35,2032 01441 V06N33 VN 0633
026407,000085: 35,2033 01452 V06N42 VN 0642
026408,000086:
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Page 621 |
026410,000088: # PROGRAM DESCRIPTION S30.1 DATE 9NOV66
026411,000089: # MOD NO 1 LOG SECTION P30,P37
026412,000090: # MOD BY RAMA AIYAWAR **
026413,000091:
026414,000092: # FUNCTIONAL DESCRIPTION
026415,000093: # BASED ON STORED TARGET PARAMETERS (R OF IGNITION (RTIG), V OF
026416,000094: # IGNITION (VTIG), TIME OF IGNITION (TIG)), COMPUTE PERIGEE ALTITUDE
026417,000095: # APOGEE ALTITUDE AND DELTAV REQUIRED (DELVSIN).
026418,000096:
026419,000097: # CALLING SEQUENCE
026420,000098: # L CALL
026421,000099: # L+1 S30.1
026422,000100:
026423,000101: # NORMAL EXIT MODE
026424,000102: # AT L+2 OR CALLING SEQUENCE (GOTO L+2)
026425,000103:
026426,000104: # SUBROUTINES CALLED
026427,000105: # LEMPREC
026428,000106: # PERIAPO
026429,000107:
026430,000108: # ALARM OR ABORT EXIT MODES
026431,000109: # NONE
026432,000110:
026433,000111: # ERASABLE INITIALIZATION REQUIRED
026434,000112: # TIG TIME OF IGNITION DP B28CS
026435,000113: # DELVSLV SPECIFIED DELTA-V INLOCAL VERT.
026436,000114: # COORDS. OF ACTIVE VEHICLE AT
026437,000115: # TIME OF IGNITION VECTOR B+7 METERS/CS
026438,000116:
026439,000117: # OUTPUT
026440,000118: # RTIG POSITION AT TIG VECTOR B+29 METERS
026441,000119: # VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
026442,000120: # PDL 4D APOGEE ALTITUDE DP B+29 M, B+27 METERS.
026443,000121: # HAPO APOGEE ALTITUDE DP B+29 METERS
026444,000122: # PDL 8D PERIGEE ALTITUDE DP B+29 M, B+27 METERS.
026445,000123: # HPER PERIGEE ALTITUDE DP B+29 METERS
026446,000124: # DELVSIN SPECIFIED DELTA-V IN INERTIAL
026447,000125: # COORD. OF ACTIVE VEHICLE AT
026448,000126: # TIME OF IGNITION VECTOR B+7 METERS/CS
026449,000127: # DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
026450,000128:
026451,000129: # DEBRIS QTEMP TEMP.ERASABLE
026452,000130: # QPRET, MPAC
026453,000131: # PUSHLIST
026454,000132:
026455,000133: 34,2000 SETLOC P30S1
026456,000134: 34,2000 BANK
026457,000135:
026458,000136: 34,2000 COUNT* $$/S30S
026459,000137:
026460,000138: 34,2000 71220 S30.1 STQ DLOAD
026461,000139: 34,2001 03632 QTEMP
026462,000140: 34,2002 03442 TIG # TIME IGNITION SCALED AT 2(+28)CS
026463,000141: 34,2003 34041 STCALL TDEC1
026464,000142: 34,2004 27056 LEMPREC # ENCKE ROUTINE FOR LEM
026465,000143:
026466,000144: 34,2005 67175 VLOAD SXA,2
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Page 622 |
026468,000146: 34,2006 00001 RATT
026469,000147: 34,2007 02777 RTX2
026470,000148: 34,2010 03642 STORE RTIG # RADIUS VECTOR AT IGNITION TIME
026471,000149: 34,2011 57456 UNIT VCOMP
026472,000150: 34,2012 27656 STOVL DELVSIN # ZRF/LV IN DELVSIN SCALED AT 2
026473,000151: 34,2013 00007 VATT # VELOCITY VECTOR AT TIG, SCALED 2(7) M/CS
026474,000152: 34,2014 03650 STORE VTIG
026475,000153: 34,2015 53435 VXV UNIT
026476,000154: 34,2016 03642 RTIG
026477,000155: 34,2017 66001 SETPD SXA,1
026478,000156: 34,2020 00001 0
026479,000157: 34,2021 02776 RTX1
026480,000158: 34,2022 47206 PUSH VXV # YRF/LV PDL 0 SCALED AT 2
026481,000159: 34,2023 03656 DELVSIN
026482,000160: 34,2024 63372 VSL1 PDVL
026483,000161: 34,2025 63315 PDVL PDVL # YRF/LV PDL 6 SCALED AT 2
026484,000162: 34,2026 03656 DELVSIN # ZRF/LV PDL 12D SCALED AT 2
026485,000163: 34,2027 03434 DELVSLV
026486,000164: 34,2030 76505 VXM VSL1
026487,000165: 34,2031 00001 0
026488,000166: 34,2032 03656 STORE DELVSIN # DELTAV IN INERT. COOR. SCALED TO B+7M/CS
026489,000167: 34,2033 77646 ABVAL
026490,000168: 34,2034 27664 STOVL DELVSAB # DELTA V MAG.
026491,000169: 34,2035 03642 RTIG # (FOR PERIAPO)
026492,000170: 34,2036 53315 PDVL VAD # VREQUIRED = VTIG + DELVSIN (FOR PERIAPO)
026493,000171: 34,2037 03650 VTIG
026494,000172: 34,2040 03656 DELVSIN
026495,000173: 34,2041 77624 CALL
026496,000174: 34,2042 46341 PERIAPO1
026497,000175: 34,2043 77624 CALL
026498,000176: 34,2044 46451 SHIFTR1 # RESCALE IF NEEDED
026499,000177: 34,2045 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
026500,000178: 34,2046 45636 MAXCHK
026501,000179: 34,2047 16321 STODL HPER # PERIGEE ALT 2(29) METERS, FOR DISPLAY
026502,000180: 34,2050 00005 4D
026503,000181: 34,2051 77624 CALL
026504,000182: 34,2052 46451 SHIFTR1 # RESCALE IF NEEDED
026505,000183: 34,2053 77624 CALL # LIMIT DISPLAY TO 9999.9 N. MI.
026506,000184: 34,2054 45636 MAXCHK
026507,000185: 34,2055 36317 STCALL HAPO # APOGEE ALT 2(29) METERS, FOR DISPLAY
026508,000186: 34,2056 03632 QTEMP
026509,000187:
026510,000188:
End of include-file P30,P37.agc. Parent file is MAIN.agc