Source Code
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These source-code files are part of a reconstructed copy of Skylark 048, the
Block II Command Module (CM) Apollo Guidance Computer (AGC) software for the
Skylab-2, Skylab-3, Skylab-4, and Apollo-Soyuz Test Project missions.
They have been created via disassembly of binary dumps of the original core rope
memory modules actually flown on Skylab-2, part numbers 2010802-541, 2010802-551,
2010802-561, 2010802-571, 2010802-581, and 2010802-591. Access to these modules
was provided by the New Mexico Museum of Space History, who we are much indebted to.
The source code for the Apollo 15, 16, and 17 software, Artemis 072, was used as
a starting point. Heavy use was made of TRW 4900.5-244, Programmed Guidance Equations
for Skylark Command Module Earth Orbital Program, dated 14 February 1972. This document
contains pseudocode of essentially all of Skylark, using original program labels which
have been copied for this source reconstruction.
Since only binary dumps (rather than listings) of Skylark are available as source material,
all comments and labels are approximate.
They have been taken from the Programmed Guidance Equations or other AGC programs where
possible, or, in some places, written from scratch to match what we believe would have
been in the original listing.
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001035,000002: ## Copyright: Public domain.
001036,000003: ## Filename: TAGS_FOR_RELATIVE_SETLOC_AND_BLANK_BANK_CARDS.agc
001037,000004: ## Purpose: A section of Skylark revision 048.
001038,000005: ## It is part of the source code for the Apollo Guidance Computer (AGC)
001039,000006: ## for Skylab-2, Skylab-3, Skylab-4, and ASTP. No original listings of
001040,000007: ## this software are available; instead, this file was created via
001041,000008: ## disassembly of dumps of the core rope modules actually flown on
001042,000009: ## Skylab-2. Access to these modules was provided by the New Mexico
001043,000010: ## Museum of Space History.
001044,000011: ## Assembler: yaYUL
001045,000012: ## Contact: Ron Burkey <info@sandroid.org>.
001046,000013: ## Website: www.ibiblio.org/apollo/index.html
001047,000014: ## Mod history: 2023-09-04 MAS Created from Artemis 072.
001048,000015: ## 2024-03-05 MAS Updated for Skylark 48.
001049,000016:
001050,000017: ## This log section has received many changes to match Skylark. Unfortunately,
001051,000018: ## the names of all of the new tags, their relative ordering in the banks,
001052,000019: ## and exactly which pieces of code are associated with which tag is not
001053,000020: ## known at this time. As such, best guesses have been used, and changes from
001054,000021: ## Artemis have been minimized wherever possible.
001055,000022:
001056,000023: ??????? FIXED MEMORY 120000 - 167777
001057,000024: ??????? COUNT BANKSUM
001058,000025:
001059,000026: # MODULE 1 CONTAINS BANKS 0 THROUGH 5
001060,000027:
001061,000028: 4000 BLOCK 02
001062,000029: 4000 FFTAG1 EQUALS
001063,000030: 4000 FFTAG2 EQUALS
001064,000031: 4000 FFTAG3 EQUALS
001065,000032: 4000 FFTAG4 EQUALS
001066,000033: 4000 FFTAG5 EQUALS
001067,000034: 4000 FFTAG7 EQUALS
001068,000035: 4000 FFTAG8 EQUALS
001069,000036: 4000 EXECF2 EQUALS
001070,000037: 4000 WAITF2 EQUALS
001071,000038: 4000 FFTAG10 EQUALS
001072,000039: 4000 FFTAG12 EQUALS
001073,000040: 4000 P30SUBS EQUALS
001074,000041: 4000 STOPRAT EQUALS
001075,000042: 4000 BNKSUM 02
001076,000043:
001077,000044: 6000 BLOCK 03
001078,000045: 6000 INTERF3 EQUALS
001079,000046: 6000 FFTAG6 EQUALS
001080,000047: 6000 FFTAG13 EQUALS
001081,000048: 6000 BNKSUM 03
001082,000049:
001083,000050: 00,2000 BANK 00
001084,000051: 00,2000 DLAYJOB EQUALS
001085,000052: 00,2000 INTERB0 EQUALS
001086,000053: 00,2000 BNKSUM 00
001087,000054:
001088,000055: 01,2000 BANK 01
001089,000056: 01,2000 RESTART EQUALS
001090,000057: 01,2000 R02 EQUALS
001091,000058: 01,2000 BNKSUM 01
001092,000059:
001093,000060:
001094,000061: 01,2000 INTERB1 EQUALS
001095,000062: 01,2000 EXECB1 EQUALS
001096,000063: 04,2000 BANK 4
001097,000064: 04,2000 VERB37 EQUALS
001098,000065: 04,2000 P50S4 EQUALS
001099,000066:
001100,000067: 04,2000 MIDDGIM EQUALS
001101,000068: 04,2000 C13BANK EQUALS # C13STALL - CHANGE CODE IF THIS IS MOVED
001102,000069: 04,2000 P60S6 EQUALS
001103,000070: 04,2000 P37LOC EQUALS
001104,000071: 04,2000 INTINIT1 EQUALS
001105,000072: 04,2000 BNKSUM 04
001106,000073:
001107,000074: 05,2000 BANK 5
001108,000075: 05,2000 FRANDRES EQUALS
001109,000076: 05,2000 DOWNTELM EQUALS
001110,000077: 05,2000 DAPMASS EQUALS
001111,000078: 05,2000 CONICS4 EQUALS
001112,000079: 05,2000 P76LOC EQUALS
001113,000080: 05,2000 BNKSUM 05
001114,000081:
001115,000082: # MODULE 2 CONTAINS BANKS 6 THROUGH 13
001116,000083:
001117,000084: 06,2000 BANK 6
001118,000085: 06,2000 IMUCOMP EQUALS
001119,000086: 06,2000 T4RUP EQUALS
001120,000087: 06,2000 CSIPROG EQUALS
001121,000088: 06,2000 P60S7 EQUALS
001122,000089: 06,2000 INTPRET2 EQUALS
001123,000090: 06,2000 BNKSUM 06
001124,000091:
001125,000092: 07,2000 BANK 7
001126,000093: 07,2000 SXTMARKE EQUALS
001127,000094: 07,2000 MODESW EQUALS
001128,000095: 07,2000 KEYRUPT EQUALS
001129,000096: 07,2000 CSIPROG6 EQUALS
001130,000097: 07,2000 P55LOC EQUALS
001131,000098: 07,2000 BNKSUM 07
001132,000099:
001133,000100: 10,2000 BANK 10
001134,000101: 10,2000 DISPLAYS EQUALS
001135,000102: 10,2000 PHASETAB EQUALS
001136,000103: 10,2000 COMGEOM2 EQUALS
001137,000104: 10,2000 P60S4 EQUALS
001138,000105: 10,2000 OPTDRV EQUALS
001139,000106: 10,2000 KALCMON3 EQUALS
001140,000107: 10,2000 CONICS5 EQUALS
001141,000108: 10,2000 BNKSUM 10
001142,000109:
001143,000110: 11,2000 BANK 11
001144,000111: 11,2000 ORBITAL EQUALS
001145,000112: 11,2000 ORBITAL1 EQUALS # CONSTANTS
001146,000113: 11,2000 INTVEL EQUALS
001147,000114: 11,2000 S52/2 EQUALS
001148,000115: 11,2000 CONICS2 EQUALS
001149,000116: 11,2000 CONICS3 EQUALS
001150,000117: 11,2000 LATLONG EQUALS
001151,000118: 11,2000 P50LOC
001152,000119: 11,2000 BNKSUM 11
001153,000120:
001154,000121: 12,2000 BANK 12
001155,000122: 12,2000 CONICS EQUALS
001156,000123: 12,2000 E/PROG EQUALS
001157,000124: 12,2000 E/PROG1 EQUALS
001158,000125: 12,2000 SR52/1 EQUALS
001159,000126: 12,2000 BNKSUM 12
001160,000127:
001161,000128: 13,2000 BANK 13
001162,000129: 13,2000 DKDAPS EQUALS
001163,000130: 13,2000 INTINIT EQUALS
001164,000131: 13,2000 BNKSUM 13
001165,000132:
001166,000133: # SPACER
001167,000134:
001168,000135: # MODULE 3 CONTAINS BANKS 14 THROUGH 21
001169,000136:
001170,000137: 14,2000 BANK 14
001171,000138: 14,2000 P50S EQUALS
001172,000139: 14,2000 RT53 EQUALS
001173,000140: 14,2000 P50S1 EQUALS
001174,000141: 14,2000 DAPS9 EQUALS
001175,000142: 14,2000 BNKSUM 14
001176,000143:
001177,000144: 15,2000 BANK 15
001178,000145: 15,2000 STARTAB EQUALS
001179,000146: 15,2000 ETRYDAP EQUALS
001180,000147: 15,2000 CDHTAGS EQUALS
001181,000148: 15,2000 CONICS1 EQUALS
001182,000149: 15,2000 BNKSUM 15
001183,000150:
001184,000151: 16,2000 BANK 16
001185,000152: 16,2000 P40S1 EQUALS
001186,000153: 16,2000 DAPROLL EQUALS
001187,000154: 16,2000 P50S2 EQUALS
001188,000155: 16,2000 INTVEL1 EQUALS
001189,000156: 16,2000 BNKSUM 16
001190,000157:
001191,000158: 17,2000 BANK 17
001192,000159: 17,2000 EXTVRBS1 EQUALS
001193,000160: 17,2000 DAPS4 EQUALS
001194,000161: 17,2000 DAPS5 EQUALS
001195,000162: 17,2000 DAPS7 EQUALS
001196,000163: 17,2000 P50S3 EQUALS
001197,000164: 17,2000 INTINIT3 EQUALS
001198,000165: 17,2000 BNKSUM 17
001199,000166:
001200,000167: 20,2000 BANK 20
001201,000168: 20,2000 DAPS6 EQUALS
001202,000169: 20,2000 DAPS1 EQUALS
001203,000170: 20,2000 DAPS2 EQUALS
001204,000171: 20,2000 MANUSTUF EQUALS
001205,000172: 20,2000 VAC5LOC EQUALS
001206,000173: 20,2000 P29TAG2 EQUALS
001207,000174: 20,2000 BNKSUM 20
001208,000175:
001209,000176: 21,2000 BANK 21
001210,000177: 21,2000 DAPS3 EQUALS
001211,000178: 21,2000 MYSUBS EQUALS
001212,000179: 21,2000 BNKSUM 21
001213,000180:
001214,000181: # MODULE 4 CONTAINS BANKS 22 THROUGH 27
001215,000182:
001216,000183: 22,2000 BANK 22
001217,000184: 22,2000 RTBCODES EQUALS
001218,000185: 22,2000 RTBCODE1 EQUALS
001219,000186: 22,2000 DAPS8 EQUALS
001220,000187: 22,2000 APOPERI EQUALS
001221,000188: 22,2000 KALCMON2 EQUALS
001222,000189: 22,2000 KALCMON1 EQUALS
001223,000190: 22,2000 P38TAG EQUALS
001224,000191: 22,2000 P11THREE EQUALS
001225,000192: 22,2000 BNKSUM 22
001226,000193:
001227,000194: 23,2000 BANK 23
001228,000195: 23,2000 P20S2 EQUALS
001229,000196: 23,2000 INFLIGHT EQUALS
001230,000197: 23,2000 COMGEOM1 EQUALS
001231,000198: 23,2000 POWFLITE EQUALS
001232,000199: 23,2000 POWFLIT1 EQUALS
001233,000200: 23,2000 POWFLIT2 EQUALS
001234,000201: 23,2000 R30LOC EQUALS
001235,000202: 23,2000 R36CM EQUALS
001236,000203: 23,2000 P20S5 EQUALS
001237,000204: 23,2000 BNKSUM 23
001238,000205:
001239,000206: 24,2000 BANK 24
001240,000207: 24,2000 P40S EQUALS
001241,000208: 24,2000 BNKSUM 24
001242,000209:
001243,000210: 25,2000 BANK 25
001244,000211: 25,2000 REENTRY EQUALS
001245,000212: 25,2000 BNKSUM 25
001246,000213:
001247,000214: 26,2000 BANK 26
001248,000215: 26,2000 INTPRET1 EQUALS
001249,000216: 26,2000 REENTRY1 EQUALS
001250,000217: 26,2000 P60S EQUALS
001251,000218: 26,2000 P60S1 EQUALS
001252,000219: 26,2000 P60S2 EQUALS
001253,000220: 26,2000 P60S3 EQUALS
001254,000221: 26,2000 PLANTIN EQUALS # LUNAR ROT
001255,000222: 26,2000 EPHEM EQUALS
001256,000223: 26,2000 P05P06 EQUALS
001257,000224: 26,2000 P30S1A EQUALS
001258,000225: 26,2000 P11FOUR EQUALS
001259,000226: 26,2000 BNKSUM 26
001260,000227:
001261,000228: 27,2000 BANK 27
001262,000229: 27,2000 TOF-FF EQUALS
001263,000230: 27,2000 MANUVER EQUALS
001264,000231: 27,2000 MANUVER1 EQUALS
001265,000232: 27,2000 P40S5 EQUALS
001266,000233: 27,2000 VECPT EQUALS
001267,000234: 27,2000 MGIM EQUALS
001268,000235: 27,2000 UPDATE2 EQUALS
001269,000236: 27,2000 R22S1 EQUALS
001270,000237: 27,2000 P60S5 EQUALS
001271,000238: 27,2000 CDHTAG EQUALS
001272,000239: 27,2000 ORBITAL2 EQUALS
001273,000240: 27,2000 P20S6 EQUALS
001274,000241: 27,2000 TOF-FF1 EQUALS
001275,000242: 27,2000 BNKSUM 27
001276,000243:
001277,000244: # MODULE 5 CONTAINS BANKS 30 THROUGH 35
001278,000245:
001279,000246: 30,2000 BANK 30
001280,000247: 30,2000 LOWSUPER EQUALS
001281,000248: 30,2000 P20S1 EQUALS
001282,000249: 30,2000 P40S3 EQUALS
001283,000250: 30,2000 P29TAG1 EQUALS
001284,000251: 30,2000 BNKSUM 30
001285,000252:
001286,000253: 31,2000 BANK 31
001287,000254: 31,2000 CSI/CDH1 EQUALS
001288,000255: 31,2000 R34 EQUALS
001289,000256: 31,2000 CDHTAG2 EQUALS
001290,000257: 31,2000 R31 EQUALS
001291,000258: 31,2000 MEASINC3 EQUALS
001292,000259: 31,2000 V89TAG EQUALS
001293,000260: 31,2000 P40S4 EQUALS
001294,000261: 31,2000 NCPROGS2 EQUALS
001295,000262: 31,2000 BNKSUM 31
001296,000263:
001297,000264: 32,2000 BANK 32
001298,000265: 32,2000 NCPROGS EQUALS
001299,000266: 32,2000 BNKSUM 32
001300,000267:
001301,000268: 33,2000 BANK 33
001302,000269: 33,2000 TESTLEAD EQUALS
001303,000270: 33,2000 IMUCAL EQUALS
001304,000271: 33,2000 IMUCAL3 EQUALS
001305,000272: 33,2000 P11TWO EQUALS
001306,000273: 33,2000 BNKSUM 33
001307,000274:
001308,000275: 34,2000 BANK 34
001309,000276: 34,2000 P11ONE EQUALS
001310,000277: 34,2000 P20S3 EQUALS
001311,000278: 34,2000 P20S4 EQUALS
001312,000279: 34,2000 BNKSUM 34
001313,000280:
001314,000281: 35,2000 BANK 35
001315,000282: 35,2000 CSI/CDH EQUALS
001316,000283: 35,2000 P30S1 EQUALS
001317,000284: 35,2000 P20S8 EQUALS
001318,000285: 35,2000 INTINIT2 EQUALS
001319,000286: 35,2000 BNKSUM 35
001320,000287:
001321,000288: # MODULE 6 CONTAINS BANKS 36 THROUGH 43
001322,000289:
001323,000290: 36,2000 BANK 36
001324,000291: 36,2000 DELRSPL1 EQUALS
001325,000292: 36,2000 MEASINC EQUALS
001326,000293: 36,2000 MEASINC1 EQUALS
001327,000294: 36,2000 P20S7 EQUALS
001328,000295: 36,2000 S3435LOC EQUALS
001329,000296: 36,2000 BNKSUM 36
001330,000297:
001331,000298: 37,2000 BANK 37
001332,000299: 37,2000 P20S EQUALS
001333,000300: 37,2000 BODYATT EQUALS
001334,000301: 37,2000 RENDEZ EQUALS
001335,000302: 37,2000 SERVICES EQUALS
001336,000303: 37,2000 CDHTAG3 EQUALS
001337,000304: 37,2000 BNKSUM 37
001338,000305:
001339,000306: 40,2000 BANK 40
001340,000307: 40,2000 PINSUPER EQUALS
001341,000308: 40,2000 PINBALL1 EQUALS
001342,000309: 40,2000 BNKSUM 40
001343,000310:
001344,000311: 41,2000 BANK 41
001345,000312: 41,2000 PINBALL2 EQUALS
001346,000313: 41,2000 EXTVBS2 EQUALS
001347,000314: 41,2000 BNKSUM 41
001348,000315:
001349,000316: 42,2000 BANK 42
001350,000317: 42,2000 PINBALL3 EQUALS
001351,000318: 42,2000 EXTVBS EQUALS
001352,000319: 42,2000 UPDATE3 EQUALS
001353,000320: 42,2000 BNKSUM 42
001354,000321:
001355,000322: 43,2000 BANK 43
001356,000323: 43,2000 SELFCHEC EQUALS
001357,000324: 43,2000 EXTVERBS EQUALS
001358,000325: 43,2000 BNKSUM 43
001359,000326:
001360,000327: 43,2000 26,3203 HI6ZEROS EQUALS ZEROVECS # ZERO VECTOR ALWAYS IN HIGH MEMORY
001361,000328: 43,2000 06,3725 LO6ZEROS EQUALS ZEROVEC # ZERO VECTOR ALWAYS IN LOW MEMORY
001362,000329: 43,2000 26,3201 HIDPHALF EQUALS UNITX
001363,000330: 43,2000 06,3723 LODPHALF EQUALS XUNIT
001364,000331: 43,2000 26,3173 HIDP1/4 EQUALS DP1/4TH
001365,000332: 43,2000 15,3411 LODP1/4 EQUALS D1/4 # 2DEC .25
001366,000333: 43,2000 26,3201 HIUNITX EQUALS UNITX
001367,000334: 43,2000 26,3177 HIUNITY EQUALS UNITY
001368,000335: 43,2000 26,3175 HIUNITZ EQUALS UNITZ
001369,000336: 43,2000 06,3723 LOUNITX EQUALS XUNIT # 2DEC .5
001370,000337: 43,2000 06,3721 LOUNITY EQUALS YUNIT # 2DEC 0
001371,000338: 43,2000 06,3717 LOUNITZ EQUALS ZUNIT # 2DEC 0
001372,000339: 43,2000 11,3741 3/4LOWDP EQUALS 3/4 # 2DEC 3.0 B-2
001373,000340: 43,2000 30,2000 SBANK= LOWSUPER
001374,000341:
001375,000342: # ROPE SPECIFIC ASSIGNS OBVIATING NEED TO CHECK COMPUTER FLAG IN DETVRUZVING INTEGRATION AREA ENTRIES
001376,000343: 43,2000 04,3414 OTHPREC EQUALS LEMPREC
001377,000344: 43,2000 04,3340 ATOPOTH EQUALS ATOPLEM
001378,000345: 43,2000 04,3305 ATOPTHIS EQUALS ATOPCSM
001379,000346:
001380,000347:
001381,000348: 43,2000 04,3314 MOVATHIS EQUALS MOVEACSM
001382,000349: 43,2000 31,2031 STATEST EQUALS V83CALL # * TEMPORARY
001383,000350: 43,2000 04,3400 THISPREC EQUALS CSMPREC
001384,000351: 43,2000 26,3201 THISAXIS = UNITX
001385,000352: 43,2000 5053 ERASID EQUALS LOW10 # DOWNLINK ERASABLE DUMP ID
001386,000353: 43,2000 6214 DELAYNUM EQUALS THREE
001387,000354:
001388,000355: # ****************************************************************************************************************
End of include-file TAGS_FOR_RELATIVE_SETLOC_AND_BLANK_BANK_CARDS.agc. Parent file is MAIN.agc