Source Code
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These source code files are a reconstruction of Sundance, the Apollo 9 LM (Lunar Module) AGC
(Apollo Guidance Computer) flight software, created from binary dumps of original core rope
program modules, as follows:
Since only binary dumps (rather than listings) of Sundance are available as source material, all comments and labels are approximate. They have been taken from other AGC programs where possible, or, in some places, written from scratch to match what we believe would have been in the original listing. |
025426,000002: ## Copyright: Public domain.
025427,000003: ## Filename: GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc
025428,000004: ## Purpose: A section of a reconstructed, mixed version of Sundance
025429,000005: ## It is part of the reconstructed source code for the Lunar
025430,000006: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 9.
025431,000007: ## No original listings of this program are available;
025432,000008: ## instead, this file was created via disassembly of dumps
025433,000009: ## of various revisions of Sundance core rope modules.
025434,000010: ## Assembler: yaYUL
025435,000011: ## Contact: Ron Burkey <info@sandroid.org>.
025436,000012: ## Website: www.ibiblio.org/apollo/index.html
025437,000013: ## Mod history: 2020-06-17 MAS Created from Luminary 69.
025438,000014:
025439,000015: ## Sundance 302
025440,000016:
025441,000017: # GROUND TRACKING DETERMINATION PROGRAM P21
025442,000018: # PROGRAM DESCRIPTION
025443,000019: # MOD NO - 1
025444,000020: # MOD BY - N. M. NEVILLE
025445,000021:
025446,000022: # FUNCTIONAL DECRIPTION -
025447,000023:
025448,000024: # TO PROVIDE THE ASTRONAUT DETAILS OF THE LM OR CSM GROUND TRACK WITHOUT
025449,000025: # THE NEED FOR GROUND COMMUNICATION (REQUESTED BY DSKY).
025450,000026: # CALLING SEQUENCE -
025451,000027:
025452,000028: # ASTRONAUT REQUEST THROUGH DSKY V37E21E
025453,000029: # SUBROUTINES CALLED -
025454,000030:
025455,000031: # GOPERF4
025456,000032: # GOFLASH
025457,000033: # THISPREC
025458,000034: # OTHPREC
025459,000035: # LAT-LONG
025460,000036:
025461,000037: # NORMAL EXIT MODES -
025462,000038:
025463,000039: # ASTRONAUT REQUEST TROUGH DSKY TO TERMINATE PROGRAM V34E
025464,000040: # ALARM OR ABORT EXIT MODES -
025465,000041:
025466,000042: # NONE
025467,000043: # OUTPUT -
025468,000044:
025469,000045: # OCTAL DISPLAY OF OPTION CODE AND VEHICLE WHOSE GROUND TRACK IS TO BE
025470,000046: # COMPUTED
025471,000047: # OPTION CODE 00002
025472,000048: # THIS 00001
025473,000049: # OTHER 00002
025474,000050: # DECIMAL DISPLAY OF TIME TO BE INTEGRATED TO HOURS , MINUTES , SECONDS
025475,000051: # DECIMAL DISPLAY OF LAT,LONG,ALT
025476,000052:
025477,000053: # ERASABLE INITIALIZATION REQUIRED
025478,000054:
025479,000055: # AX0 2DEC 4.652459653 E-5 RADIANS %68-69 CONSTANTS"
025480,000056:
025481,000057: # -AY0 2DEC 2.147535898 E-5 RADIANS
025482,000058:
025483,000059: # AZ0 2DEC .7753206164 REVOLUTIONS
025484,000060: # FOR LUNAR ORBITS 504LM VECTOR IS NEEDED
025485,000061:
025486,000062: # 504LM 2DEC -2.700340600 E-5 RADIANS
025487,000063:
025488,000064: # 504LM _2 2DEC -7.514128400 E-4 RADIANS
025489,000065:
025490,000066: # 504LM _4 2DEC _2.553198641 E-4 RADIANS
025491,000067:
025492,000068: # NONE
025493,000069: # DEBRIS
025494,000070:
025495,000071: # CENTRALS-A,Q,L
025496,000072: # OTHER - THOSE USED BY THE ABOVE LISTED SUBROUTINES
025497,000073: # SEE LEMPREC, LAT-LONG
025498,000074:
025499,000075: 34,3411 30,2000 SBANK= LOWSUPER # FOR LOW 2CADR'S.
025500,000076:
025501,000077: 33,2000 BANK 33
025502,000078: 24,2000 SETLOC P20S
025503,000079: 24,2000 BANK
025504,000080:
025505,000081: 24,3116 E7,1745 EBANK= P21TIME
025506,000082: 24,3116 COUNT* $$/P21
025507,000083: 24,3116 35026 PROG21 CAF ONE
025508,000084: 24,3117 55156 TS OPTION2 # ASSUMED VEHICLE IS LM, R2 = 00001
025509,000085: 24,3120 35025 CAF BIT2 # OPTION 2
025510,000086: 24,3121 04655 TC BANKCALL
025511,000087: 24,3122 20542 CADR GOPERF4
025512,000088: 24,3123 04106 TC GOTOPOOH # TERMINATE
025513,000089: 24,3124 03126 TC +2 # PROCEED VALUE OF ASSUMED VEHICLE OK
025514,000090: 24,3125 03120 TC -5 # R2 LOADED THROUGH DSKY
025515,000091: 24,3126 33217 P21PROG1 CAF V6N34 # LOAD DESIRED TIME OF LAT-LONG.
025516,000092: 24,3127 04655 TC BANKCALL
025517,000093: 24,3130 20406 CADR GOFLASH
025518,000094: 24,3131 04106 TC GOTOPOOH # TERM
025519,000095: 24,3132 03134 TC +2 # PROCEED VALUES OK
025520,000096: 24,3133 03126 TC -5 # TIME LOADED THROUGH DSKY
025521,000097: 24,3134 06014 TC INTPRET
025522,000098: 24,3135 77745 DLOAD
025523,000099: 24,3136 01047 DSPTEM1
025524,000100: 24,3137 03746 STORE P21TIME
025525,000101: 24,3140 45335 SLOAD DSU
025526,000102: 24,3141 01157 OPTION2
025527,000103: 24,3142 11215 P21ONENN
025528,000104: 24,3143 71230 BHIZ DLOAD
025529,000105: 24,3144 51157 P21PROG2 # VEHICLE TO BE INTEGRATED IS LEM
025530,000106: 24,3145 03746 P21TIME # VEHICLE TO BE INTEGRATED IS CSM
025531,000107: 24,3146 34041 STCALL TDEC1 # INTEGRATE TO TIME SPECIFIED IN TDEC
025532,000108: 24,3147 27014 OTHPREC # ADJUST UNITS FOR LAT-LONG ROUTINE
025533,000109: 24,3150 46135 P21PROGA SLOAD BHIZ
025534,000110: 24,3151 00050 X2
025535,000111: 24,3152 51165 P21PROG3
025536,000112: 24,3153 43175 VLOAD SETGO
025537,000113: 24,3154 00001 RATT
025538,000114: 24,3155 01423 LUNAFLAG
025539,000115: 24,3156 51170 P21PROG4
025540,000116: 24,3157 77745 P21PROG2 DLOAD
025541,000117: 24,3160 03746 P21TIME
025542,000118: 24,3161 34041 STCALL TDEC1
025543,000119: 24,3162 27030 THISPREC
025544,000120: 24,3163 77650 GOTO
025545,000121: 24,3164 51150 P21PROGA
025546,000122: 24,3165 43175 P21PROG3 VLOAD CLEAR
025547,000123: 24,3166 00001 RATT
025548,000124: 24,3167 01663 LUNAFLAG
025549,000125: 24,3170 16034 P21PROG4 STODL ALPHAV
025550,000126: 24,3171 00015 TAT
025551,000127: 24,3172 45014 CLEAR CALL
025552,000128: 24,3173 00662 ERADFLAG
025553,000129: 24,3174 26323 LAT-LONG
025554,000130: 24,3175 77776 EXIT
025555,000131: 24,3176 33216 CAF V06N43 # DISPLAY LAT,LONG,ALT
025556,000132: 24,3177 04655 TC BANKCALL # LAT,LONG = 1/2 REVS B0
025557,000133: 24,3200 20406 CADR GOFLASH # ALT = KM B14
025558,000134: 24,3201 04106 TC GOTOPOOH # TERM
025559,000135: 24,3202 04106 TC GOTOPOOH
025560,000136: 24,3203 06014 TC INTPRET # V32E RECYCLE
025561,000137: 24,3204 43345 DLOAD DAD
025562,000138: 24,3205 03746 P21TIME
025563,000139: 24,3206 11213 600SEC # 600 SECONDS OR 10 MIN
025564,000140: 24,3207 01047 STORE DSPTEM1
025565,000141: 24,3210 77634 RTB
025566,000142: 24,3211 51126 P21PROG1
025567,000143: 24,3212 00003 25140 600SEC 2DEC 60000 B-28 # 10 MIN
025568,000144:
025569,000145: 24,3214 00001 P21ONENN OCT 00001 # NEEDED TO DETERMINE VEHICLE
025570,000146: 24,3215 00000 OCT 00000 # TO BE INTEGRATED
025571,000147: 24,3216 01453 V06N43 VN 00643
025572,000148: 24,3217 01442 V6N34 VN 00634
025573,000149:
025574,000150:
End of include-file GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc. Parent file is MAIN.agc