Source Code
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This is a reconstructed version of Luminary 130, the initial AGC program released
in November 1969 for the Apollo 13 LM. Three more releases
followed before the flown revision was finally manufactured in February 1970.
This reconstruction was created from a previous transcription of the original listing of
Luminary 131, combined with Luminary memo #129 which describes the small difference
between the Luminary 130 and 131. The reconstructed source code was verified by
matching memory-bank checksums to those listed for Luminary 130 in drawing 2021152G.
In this source code, program comments from the original (Luminary 131) code are
prefixed with '#', while those added later by the Virtual AGC project are prefixed
with '##'.
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008348,000002: ## Copyright: Public domain.
008349,000003: ## Filename: AGS_INITIALIZATION.agc
008350,000004: ## Purpose: A section of the reconstructed source code for Luminary 130.
008351,000005: ## This was the original program released for the Apollo 13 LM,
008352,000006: ## although several more revisions would follow. It has been
008353,000007: ## reconstructed from a listing of Luminary 131, from which it
008354,000008: ## differs on only two lines in P70-P71. The difference is
008355,000009: ## described in detail in Luminary memo #129, which was used
008356,000010: ## to perform the reconstruction. This file is intended to be a
008357,000011: ## faithful reconstruction, except that the code format has been
008358,000012: ## changed to conform to the requirements of the yaYUL assembler
008359,000013: ## rather than the original YUL assembler.
008360,000014: ## Reference: pp. 208-212
008361,000015: ## Contact: Ron Burkey <info@sandroid.org>.
008362,000016: ## Website: www.ibiblio.org/apollo/index.html
008363,000017: ## Mod history: 05/05/03 RSB. Began transcribing.
008364,000018: ## 05/14/05 RSB Corrected website reference above.
008365,000019: ## 2017-01-06 RSB Page numbers now agree with those on the
008366,000020: ## original harcopy, as opposed to the PDF page
008367,000021: ## numbers in 1701.pdf.
008368,000022: ## 2017-02-22 RSB Proofed comment text using octopus/ProoferComments.
008369,000023: ## 2018-09-04 MAS Copied from Luminary 131 for Luminary 130.
008370,000024:
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Page 208
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008372,000026:
008373,000027: # PROGRAM NAME: AGS INITIALIZATION (R47)
008374,000028:
008375,000029: # WRITTEN BY: RHODE/KILROY/FOLLETT
008376,000030:
008377,000031: # MOD NO.: 0
008378,000032: # DATE: 23 MARCH 1967
008379,000033: # MOD BY: KILROY
008380,000034:
008381,000035: # MOD NO.: 1
008382,000036: # DATE: 28 OCTOBER 1967
008383,000037: # MOD BY: FOLLETT
008384,000038:
008385,000039: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008386,000040: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008387,000041:
008388,000042: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008389,000043: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008390,000044:
008391,000045: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008392,000046: # REQUESTED DURING THIS PROGRAM
008393,000047:
008394,000048: # LOG SECTION: AGS INITIALIZATION
008395,000049:
008396,000050: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008397,000051: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008398,000052:
008399,000053: # SUBROUTINES
008400,000054: # CALLED:
008401,000055:
008402,000056: # NORMAL EXIT: ENDEXT
008403,000057:
008404,000058: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008405,000059: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008406,000060:
008407,000061: # ERASABLES
008408,000062: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008409,000063: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008410,000064: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008411,000065: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008412,000066:
008413,000067: 05,2447 E4,1600 EBANK= AGSBUFF
008414,000068:
008415,000069: 40,2000 BANK 40
008416,000070: 32,2000 SETLOC R47
008417,000071: 32,2000 BANK
008418,000072:
008419,000073: 32,2005 COUNT* $$/R47
008420,000074:
008421,000075: 32,2005 34737 AGSINIT CAF REFSMBIT
008422,000076: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008423,000077: 32,2007 10000 CCS A
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Page 209
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008425,000079: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008426,000080: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008427,000081: 32,2012 00220 OCT 220
008428,000082: 32,2013 05472 TC ENDEXT
008429,000083:
008430,000084: 32,2014 00006 NEWAGS EXTEND
008431,000085: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008432,000086: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008433,000087:
008434,000088: 32,2017 00006 REDSPTEM EXTEND
008435,000089: 32,2020 31421 DCA AGSK
008436,000090: 32,2021 53051 DXCH DSPTEMX
008437,000091: 32,2022 32172 AGSDISPK CAF V06N16
008438,000092: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008439,000093: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008440,000094: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008441,000095: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008442,000096: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008443,000097: 32,2030 60154 AD MPAC
008444,000098: 32,2031 00006 EXTEND
008445,000099: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008446,000100:
008447,000101: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008448,000102: 32,2034 31051 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008449,000103: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008450,000104: # DISPLAY THE NEW K
008451,000105:
008452,000106: 32,2036 06042 AGSVCALC TC INTPRET
008453,000107: 32,2037 77614 SET
008454,000108: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008455,000109: 32,2041 77414 SET EXIT
008456,000110: 32,2042 02076 XDSPFLAG
008457,000111:
008458,000112: 32,2043 32172 CAF V06N16
008459,000113: 32,2044 04616 TC BANKCALL
008460,000114: 32,2045 20621 CADR EXDSPRET
008461,000115:
008462,000116: 32,2046 06042 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008463,000117: 32,2047 77634 RTB # TO THE PRESENT TIME
008464,000118: 32,2050 21574 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008465,000119: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008466,000120: 32,2052 27056 LEMPREC
008467,000121: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008468,000122: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008469,000123: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008470,000124: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008471,000125: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008472,000126: 32,2060 27042 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008473,000127: 32,2061 77624 CALL
008474,000128: 32,2062 64132 SCALEVEC
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008476,000130: 32,2063 16207 STODL AGSBUFF +6
008477,000131: 32,2064 00015 TAT
008478,000132: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008479,000133: 32,2066 02021 AGSK
008480,000134: 32,2067 24175 TSCALE
008481,000135: 32,2070 02215 STORE AGSBUFF +12D
008482,000136: 32,2071 77776 EXIT
008483,000137:
008484,000138: 32,2072 34753 CAF LAGSLIST
008485,000139: 32,2073 54333 TS DNLSTCOD
008486,000140:
008487,000141: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008488,000142: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008489,000143: 32,2076 01736 CADR DELAYJOB
008490,000144:
008491,000145: 32,2077 31321 CA AGSWORD
008492,000146: 32,2100 54333 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008493,000147: 32,2101 34744 CAF IMUSEBIT
008494,000148: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008495,000149: 32,2103 10000 CCS A
008496,000150: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008497,000151: 32,2105 11301 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008498,000152: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008499,000153: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008500,000154: 32,2110 12111 TCF +1
008501,000155: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008502,000156: 32,2112 04616 TC BANKCALL
008503,000157: 32,2113 01736 CADR DELAYJOB
008504,000158: 32,2114 12105 TCF CKSTALL
008505,000159:
008506,000160: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008507,000161: 32,2116 16705 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320 MSECS
008508,000162: 32,2117 04616 TC BANKCALL # WAIT 3SEC FOR COUNTERS TO INCREMENT
008509,000163: 32,2120 17707 CADR IMUSTALL
008510,000164: 32,2121 02122 TC AGSEND
008511,000165: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008512,000166: 32,2123 00054 ADRES NODOFLAG
008513,000167:
008514,000168: 32,2124 32173 CAF V50N16
008515,000169: 32,2125 04616 TC BANKCALL
008516,000170: 32,2126 20342 CADR GOMARK3
008517,000171: 32,2127 15472 TCF ENDEXT
008518,000172: 32,2130 15472 TCF ENDEXT
008519,000173: 32,2131 05472 TC ENDEXT
008520,000174:
008521,000175: 32,2132 64375 SCALEVEC VLOAD MXV
008522,000176: 32,2133 00025 VATT1
008523,000177: 32,2134 01734 REFSMMAT
008524,000178: 32,2135 72561 VXSC VSL2
008525,000179: 32,2136 24202 VSCALE
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008527,000181: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008528,000182: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008529,000183: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008530,000184: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008531,000185: 32,2143 21773 VECSGNAG
008532,000186: 32,2144 24025 STOVL VATT1
008533,000187: 32,2145 00017 RATT1
008534,000188: 32,2146 74321 MXV VXSC
008535,000189: 32,2147 01734 REFSMMAT
008536,000190: 32,2150 24200 RSCALE
008537,000191: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008538,000192: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008539,000193: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008540,000194: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008541,000195: 32,2155 21773 VECSGNAG
008542,000196: 32,2156 77750 LXA,1
008543,000197: 32,2157 00024 VATT1
008544,000198: 32,2160 72130 SXA,1 LXA,1
008545,000199: 32,2161 00155 MPAC +1
008546,000200: 32,2162 00026 VATT1 +2
008547,000201: 32,2163 72130 SXA,1 LXA,1
008548,000202: 32,2164 00160 MPAC +4
008549,000203: 32,2165 00030 VATT1 +4
008550,000204: 32,2166 43530 SXA,1 RVQ
008551,000205: 32,2167 00162 MPAC +6
008552,000206:
008553,000207: 32,2170 4753 LAGSLIST = ONE
008554,000208: 32,2170 00216 V01N14 VN 0114
008555,000209: 32,2171 14400 V50N00A VN 5000
008556,000210: 32,2172 6010 V00N25 EQUALS OCT31
008557,000211: 32,2172 01420 V06N16 VN 0616
008558,000212: 32,2173 4242 V00N34 EQUALS 34DEC
008559,000213: 32,2173 14420 V50N16 VN 5016
008560,000214: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008561,000215: 32,2176 03720 20SEC DEC 2000 B-14
008562,000216: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008563,000217: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008564,000218: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008565,000219: 32,2205 00000 60000 2OCT 0000060000
008566,000220: 32,2207 00000 60000 2OCT 0000060000
008567,000221: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008568,000222: 32,2213 00000 37777 2OCT 0000037777
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008570,000224: 32,2215 00000 37777 2OCT 0000037777
008571,000225:
008572,000226: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008573,000227:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc