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. |
009764,000002: ## Copyright: Public domain.
009765,000003: ## Filename: RESTART_TABLES.agc
009766,000004: ## Purpose: A section of Luminary 1C, revision 131.
009767,000005: ## It is part of the source code for the Lunar Module's (LM)
009768,000006: ## Apollo Guidance Computer (AGC) for Apollo 13.
009769,000007: ## This file is intended to be a faithful transcription, except
009770,000008: ## that the code format has been changed to conform to the
009771,000009: ## requirements of the yaYUL assembler rather than the
009772,000010: ## original YUL assembler.
009773,000011: ## Reference: pp. 239-244
009774,000012: ## Contact: Ron Burkey <info@sandroid.org>.
009775,000013: ## Website: www.ibiblio.org/apollo/index.html
009776,000014: ## Mod history: 05/06/03 RSB. Began transcribing.
009777,000015: ## 05/14/05 RSB Corrected website references above.
009778,000016: ## 2017-01-06 RSB Page numbers now agree with those on the
009779,000017: ## original harcopy, as opposed to the PDF page
009780,000018: ## numbers in 1701.pdf.
009781,000019: ## 2017-02-08 RSB Comment-text fixes identified while proofing Artemis 72.
009782,000020: ## 2017-02-20 RSB Proofed comment text using octopus/ProoferComments.
009783,000021: ## 2017-03-01 RSB Restored a period which was present in both Luminary 116
009784,000022: ## and 210, and was therefore presumably missing due to a
009785,000023: ## printer problem.
009786,000024: ## 2017-03-13 RSB GOP00FIX -> GOPOOFIX.
009787,000025:
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Page 239 |
009789,000027: # RESTART TABLES
009790,000028: # ------------------
009791,000029:
009792,000030: # THERE ARE TWO FORMS OF RESTART TABLES FOR EACH GROUP. THEY ARE KNOWN AS THE EVEN RESTART TABLES AND THE ODD
009793,000031: # RESTART TABLES. THE ODD TABLES HAVE ONLY ONE ENTRY OF THREE LOCATIONS WHILE THE EVEN TABLES HAVE TWO ENTRIES
009794,000032: # EACH USING THREE LOCATIONS. THE INFORMATION AS TO WHETHER IT IS A JOB, WAITLIST, OR A LONGCALL IS GIVEN BY THE
009795,000033: # WAY THINGS ARE PUT IN TO THE TABLES.
009796,000034:
009797,000035: # A JOB HAS ITS PRIORITY STORED IN PRDTTAB OF THE CORRECT PHASE SPOT - A POSITIVE PRIORITY INDICATES A
009798,000036: # FINDVAC JOB, A NEGATIVE PRIORITY A NOVAC. THE 2CADR OF THE JOB IS STORED IN THE CADRTAB.
009799,000037: # FOR EXAMPLE,
009800,000038:
009801,000039: # 5.7SPOT OCT 23000
009802,000040: # 2CADR SOMEJOB
009803,000041:
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In the line below, the printout certainly has no period at the end of the line. However, the corresponding lines in Luminary 116 and 210 have such a period and are otherwise identical. Therefore, this is presumably a printer error, and the period has been restored. |
009807,000045: # A RESTART OF GROUP 5 WITH PHASE SEVEN WOULD THEN CAUSE SOMEJOB TO BE RESTARTED AS A FINDVAC WITH PRIORITY 23.
009808,000046:
009809,000047: # 5.5SPOT OCT -23000
009810,000048: # 2CADR ANYJOB
009811,000049:
009812,000050: # HERE A RESTART OF GROUP 5 WITH PHASE 7 WOULD CAUSE ANYJOB TO BE RESTARTED AS A NOVAC WITH PRIORITY 23.
009813,000051: # A LONGCALL HAS ITS GENADR OF ITS 2CADR STORED NEGATIVELY AND ITS BBCON STORED POSITIVELY. IN ITS PRDTTAB IS
009814,000052: # PLACED THE LOCATION OF A DP REGISTER THAT CONTAINS THE DELTA TIME THAT LONGCALL HAD BEEN ORIGINALLY STARTED
009815,000053: # WITH. EXAMPLE,
009816,000054:
009817,000055: # 3.6SPOT GENADR DELTAT
009818,000056: # -GENADR LONGTASK
009819,000057: # BBCON LONGTASK
009820,000058: # OCT 31000
009821,000059: # 2CADR JOBAGAIN
009822,000060:
009823,000061: # THIS WOULD START UP LONGTASK AT THE APPROPRIATE TIME, OR IMMEDIATELY IF THE TIME HAD ALREADY PASSED. IT SHOULD
009824,000062: # BE NOTED THAT IF DELTAT IS IN A SWITCHED E BANK, THIS INFORMATOIN SHOULD BE IN THE BBCON OF THE 2CADR OF THE
009825,000063: # TASK. FROM ABOVE, WE SEE THAT THE SECOND PART O FTHIS PHASE WOULD BE STARTED AS A JOB WITH A PRIORITY OF 31.
009826,000064:
009827,000065: # WAITLIST CALLS ARE IDENTIFIED BY THE FACT THAT THEIR 2CADR IS STORED NEGATIVELY. IF PRDTTAB OF THE PHASE SPOT
009828,000066: # IS POSITIVE, THEN IT CONTAINS THE DELTA TIME, IF PRDTTAB IS NEGATIVE THEN IT IS THE -GENADR OF AN ERASABLE
009829,000067: # LOCATION CONTAINING THE DELTA TIME, THAT IS, THE TIME IS STORED INDIRECTLY. IT SHOULD BE NOTED AS ABOVE, THAT
009830,000068: # IF THE TIME IS STORED INDIRECTLY, THE BBCON MUST CONTAIN THE NECESSARY E BANK INFORMATION IF APPLICABLE. WITH
009831,000069: # WAITLIST WE HAVE ONE FURTHER OPTION, IF -0 IS STORED IN PRDTTAB, IT WILL CAUSE AN IMMEDIATE RESTART OF THE
009832,000070: # TASK. EXAMPLES,
009833,000071:
009834,000072: # OCT 77777 THIS WILL CAUSE AN IMMEDIATE RESTART
009835,000073: # -2CADR ATASK OF THE TASK :ATASK:
009836,000074: #
009837,000075: # DEC 200 IF THE TIME OF THE 2 SECONDS SINCE DUMMY
009838,000076: # -2CADR DUMMY WAS PUT ON WAITLIST IS UP, IT WILL BEGIN
009839,000077: # IN 10 MS, OTHERWISE IT WILL BEGIN WHEN
009840,000078: # IT NORMALLY WOULD HAVE BEGUN.
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Page 240 |
009842,000080: # -GENADR DTIME WHERE DTIME CONTAINS THE DELTA TIME
009843,000081: # -2CADR TASKTASK OTHERWISE THIS IS AS ABOVE
009844,000082:
009845,000083: # ***** NOW THE TABLES THEMSELVES *****
009846,000084:
009847,000085: 01,2002 BANK 01
009848,000086: 01,2000 SETLOC RESTART
009849,000087: 01,2000 BANK
009850,000088:
009851,000089: 01,2002 PRDTTAB EQUALS 12000 # USED TO FIND THE PRIORITY OR DELTATIME
009852,000090: 01,2002 CADRTAB EQUALS 12001 # THIS AND THE NEXT RELATIVE LOC CONTAIN
009853,000091: # RESTART 2CADR
009854,000092:
009855,000093: 01,2002 COUNT* $$/RSTAB # TABLES IN BANK 1.
009856,000094: 01,2002 00010 SIZETAB TC 1.2SPOT -12006
009857,000095: 01,2003 00020 TC 1.3SPOT -12004
009858,000096: 01,2004 00010 TC 2.2SPOT -12006
009859,000097: 01,2005 00026 TC 2.3SPOT -12004
009860,000098: 01,2006 00010 TC 3.2SPOT -12006
009861,000099: 01,2007 00056 TC 3.3SPOT -12004
009862,000100: 01,2010 00062 TC 4.2SPOT -12006
009863,000101: 01,2011 00072 TC 4.3SPOT -12004
009864,000102: 01,2012 00145 TC 5.2SPOT -12006
009865,000103: 01,2013 00163 TC 5.3SPOT -12004
009866,000104: 01,2014 00010 TC 6.2SPOT -12006
009867,000105: 01,2015 00174 TC 6.3SPOT -12004
009868,000106: 01,2016 21000 1.2SPOT OCT 21000 # A DUMMY EXAMPLE TO BE REPLACED AS SOON
009869,000107: 01,2017 0074 EBANK= STATE
009870,000108: 01,2017 05155 04060 2CADR ENDOFJOB # AS THERE IS A LEGITIMATE 1.2SPOT
009871,000109:
009872,000110: 01,2021 00144 DEC 100 B-14
009873,000111: 01,2022 0074 EBANK= STATE
009874,000112: 01,2022 05261 04060 2CADR TASKOVER
009875,000113:
009876,000114: # ANY MORE GROUP 1.EVEN RESTART VALUES SHOULD GO HERE
009877,000115:
009878,000116: 01,2024 76300 1.3SPOT -GENADR SAVET-30
009879,000117: 01,2025 E7,1515 EBANK= DVCNTR
009880,000118: 01,2025 75427 03710 -2CADR ULLGTASK
009881,000119:
009882,000120: 01,2027 32000 1.5SPOT OCT 32000
009883,000121: 01,2030 E7,1654 EBANK= HMEAS
009884,000122: 01,2030 03630 66067 2CADR REREPOS
009885,000123:
009886,000124: # ANY MORE GROUP 1.ODD RESTART VALUES SHOULD GO HERE
009887,000125:
009888,000126: 01,2032 01,2016 2.2SPOT EQUALS 1.2SPOT
009889,000127:
009890,000128: # ANY MORE GROUP 2.EVEN RESTART VALUES SHOULD GO HERE
009891,000129:
009892,000130: 01,2032 02627 2.3SPOT GENADR 600SECS
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009894,000132: 01,2033 75175 -GENADR STATEINT
009895,000133: 01,2034 E3,1554 EBANK= RRECTCSM
009896,000134: 01,2034 26063 BBCON STATEINT
009897,000135:
009898,000136: 01,2035 05000 2.5SPOT OCT 05000
009899,000137: 01,2036 E3,1554 EBANK= RRECTCSM
009900,000138: 01,2036 02611 26063 2CADR STATINT1
009901,000139:
009902,000140: 01,2040 02734 2.7SPOT DEC 1500 B-14
009903,000141: 01,2041 E7,1456 EBANK= LOSCOUNT
009904,000142: 01,2041 75533 27710 -2CADR P20LEMC1
009905,000143:
009906,000144: 01,2043 14000 2.11SPOT OCT 14000
009907,000145: 01,2044 E7,1762 EBANK= P21TIME
009908,000146: 01,2044 02414 50067 2CADR P25LEM1
009909,000147:
009910,000148: 01,2046 10000 2.13SPOT OCT 10000
009911,000149: 01,2047 E7,1456 EBANK= LOSCOUNT
009912,000150: 01,2047 02223 54067 2CADR RELINUS
009913,000151:
009914,000152: 01,2051 26000 2.15SPOT OCT 26000
009915,000153: 01,2052 E7,1456 EBANK= LOSCOUNT
009916,000154: 01,2052 02654 50067 2CADR R22RSTRT
009917,000155:
009918,000156: 01,2054 77777 2.17SPOT OCT 77777
009919,000157: 01,2055 E7,1700 EBANK= VGPREV
009920,000158: 01,2055 75436 03710 -2CADR REDO2.17
009921,000159:
009922,000160: 01,2057 00031 2.21SPOT DEC 25 B-14
009923,000161: 01,2060 E7,1515 EBANK= DVCNTR
009924,000162: 01,2060 75771 35710 -2CADR R10,R11
009925,000163:
009926,000164: # ANY MORE GROUP 2.ODD RESTART VALUES SHOULD GO HERE.
009927,000165:
009928,000166: 01,2062 01,2016 3.2SPOT EQUALS 1.2SPOT
009929,000167:
009930,000168: # ANY MORE GROUP 3.EVEN RESTART VALUES SHOULD GO HERE
009931,000169:
009932,000170: 01,2062 76355 3.3SPOT -GENADR ZOOMTIME
009933,000171: 01,2063 E7,1515 EBANK= DVCNTR
009934,000172: 01,2063 74110 05710 -2CADR ZOOM
009935,000173:
009936,000174: 01,2065 20000 3.5SPOT OCT 20000
009937,000175: 01,2066 E7,1453 EBANK= TTOGO
009938,000176: 01,2066 02540 56067 2CADR S40.13
009939,000177:
009940,000178: # ANY MORE GROUP 3.ODD RESTART VALUES SHOULD GO HERE
009941,000179:
009942,000180: 01,2070 04704 4.2SPOT DEC 2500 B-14
009943,000181: 01,2071 E7,1453 EBANK= TTOGO
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009945,000183: 01,2071 75423 03710 -2CADR TIG-5
009946,000184:
009947,000185: 01,2073 77777 OCT 77777
009948,000186: 01,2074 E7,1453 EBANK= TTOGO
009949,000187: 01,2074 75433 03710 -2CADR REDO4.2
009950,000188:
009951,000189: # ANY MORE GROUP 4.EVEN RESTART VALUES SHOULD GO HERE
009952,000190:
009953,000191: 01,2076 25000 4.3SPOT OCT 25000
009954,000192: 01,2077 E7,1515 EBANK= DVCNTR
009955,000193: 01,2077 03533 64067 2CADR GOABORT
009956,000194:
009957,000195: 01,2101 00062 4.5SPOT DEC 50 B-14
009958,000196: 01,2102 E7,1453 EBANK= TTOGO
009959,000197: 01,2102 75211 03710 -2CADR ULLAGOFF
009960,000198:
009961,000199: 01,2104 00764 4.7SPOT DEC 500 B-14
009962,000200: 01,2105 E7,1515 EBANK= DVCNTR
009963,000201: 01,2105 75370 03710 -2CADR TIG-0
009964,000202:
009965,000203: 01,2107 76260 4.11SPOT -GENADR TGO +1
009966,000204: 01,2110 E7,1515 EBANK= DVCNTR
009967,000205: 01,2110 74231 03710 -2CADR ENGOFTSK
009968,000206:
009969,000207: 01,2112 12000 4.13SPOT OCT 12000
009970,000208: 01,2113 E7,1462 EBANK= TRKMKCNT
009971,000209: 01,2113 03227 74067 2CADR POSTBURN
009972,000210:
009973,000211: 01,2115 00764 4.15SPOT DEC 500 B-14
009974,000212: 01,2116 E7,1453 EBANK= TTOGO
009975,000213: 01,2116 75477 03710 -2CADR TIG-30
009976,000214:
009977,000215: 01,2120 77777 4.17SPOT OCT 77777
009978,000216: 01,2121 E7,1515 EBANK= DVCNTR
009979,000217: 01,2121 75423 03710 -2CADR TIG-5
009980,000218:
009981,000219: 01,2123 13000 4.21SPOT OCT 13000
009982,000220: 01,2124 E5,1730 EBANK= STAR
009983,000221: 01,2124 03012 30065 2CADR R51.1 +1
009984,000222:
009985,000223: 01,2126 77777 4.23SPOT OCT 77777
009986,000224: 01,2127 E7,1515 EBANK= DVCNTR
009987,000225: 01,2127 75345 03710 -2CADR IGNITION
009988,000226:
009989,000227: 01,2131 01477 4.25SPOT GENADR SAVET-30
009990,000228: 01,2132 75535 -GENADR TIG-35
009991,000229: 01,2133 E7,1477 EBANK= SAVET-30
009992,000230: 01,2133 74067 BBCON TIG-35
009993,000231:
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Page 243 |
009995,000233: 01,2134 52777 4.27SPOT OCT 52777
009996,000234: 01,2135 E7,1515 EBANK= DVCNTR
009997,000235: 01,2135 02070 42067 2CADR P70A
009998,000236:
009999,000237: 01,2137 52777 4.31SPOT OCT 52777
010000,000238: 01,2140 E7,1515 EBANK= DVCNTR
010001,000239: 01,2140 02073 42067 2CADR P71A
010002,000240:
010003,000241: 01,2142 46777 4.33SPOT OCT 46777
010004,000242: 01,2143 E7,1515 EBANK= DVCNTR
010005,000243: 01,2143 02024 10067 2CADR GOPOOFIX
010006,000244:
010007,000245: 01,2145 46777 4.35SPOT OCT 46777
010008,000246: 01,2146 E7,1515 EBANK= DVCNTR
010009,000247: 01,2146 05655 04067 2CADR GOPOODOO
010010,000248:
010011,000249: 01,2150 52777 4.37SPOT OCT 52777
010012,000250: 01,2151 E7,1455 EBANK= WHICH
010013,000251: 01,2151 02575 74067 2CADR COMFAIL
010014,000252:
010015,000253: # ANY MORE 4.ODD RESTART VALUES SHOULD GO HERE.
010016,000254: 01,2153 22000 5.2SPOT OCT 22000
010017,000255: 01,2154 E7,1515 EBANK= DVCNTR
010018,000256: 01,2154 02463 46067 2CADR NORMLIZE
010019,000257:
010020,000258: 01,2156 00310 DEC 200 B-14
010021,000259: 01,2157 E7,1515 EBANK= DVCNTR
010022,000260: 01,2157 74166 01710 -2CADR REREADAC
010023,000261:
010024,000262: 01,2161 00310 5.4SPOT DEC 200 B-14
010025,000263: 01,2162 E7,1515 EBANK= DVCNTR
010026,000264: 01,2162 74166 01710 -2CADR REREADAC
010027,000265:
010028,000266: 01,2164 20000 OCT 20000
010029,000267: 01,2165 E7,1515 EBANK= DVCNTR
010030,000268: 01,2165 02206 66067 2CADR SERVICER
010031,000269:
010032,000270: # ANY MORE GROUP 5.EVEN RESTART VALUES SHOULD GO HERE
010033,000271:
010034,000272: 01,2167 00310 5.3SPOT DEC 200 B-14
010035,000273: 01,2170 E7,1515 EBANK= DVCNTR
010036,000274: 01,2170 74166 01710 -2CADR REREADAC
010037,000275:
010038,000276: 01,2172 77777 5.5SPOT OCT 77777
010039,000277: 01,2173 E7,1515 EBANK= DVCNTR
010040,000278: 01,2173 74326 01710 -2CADR REDO5.5
010041,000279:
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Page 244 |
010043,000281: 01,2175 77777 5.7SPOT OCT 77777
010044,000282: 01,2176 E7,1515 EBANK= DVCNTR
010045,000283: 01,2176 74361 01710 -2CADR BIBIBIAS
010046,000284:
010047,000285: # ANY MORE GROUP 5.ODD RESTART VALUES SHOULD GO HERE
010048,000286:
010049,000287: 01,2200 01,2016 6.2SPOT EQUALS 1.2SPOT
010050,000288: 01,2200 00144 6.3SPOT DEC 100 B-14
010051,000289: 01,2201 E7,1441 EBANK= TIG
010052,000290: 01,2201 75054 03710 -2CADR CLOKTASK
010053,000291:
010054,000292: 01,2203 30000 6.5SPOT OCT 30000 # PROTECT INCREMENTING OF TIME2,TIME1 BY
010055,000293: 01,2204 E3,1706 EBANK= TEPHEM # P27(UPDATE PROGRAM) VIA V70 OR V73.
010056,000294: 01,2204 03557 10063 2CADR TIMEDIDR
010057,000295:
010058,000296: 01,2206 17000 6.7SPOT OCT 17000
010059,000297: 01,2207 E7,1700 EBANK= VGPREV
010060,000298: 01,2207 03354 74067 2CADR REDO6.7
010061,000299:
010062,000300:
End of include-file RESTART_TABLES.agc. Parent file is MAIN.agc