Source Code
|
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 '##'.
|
008359,000002: ## Copyright: Public domain.
008360,000003: ## Filename: AGS_INITIALIZATION.agc
008361,000004: ## Purpose: A section of the reconstructed source code for Luminary 130.
008362,000005: ## This was the original program released for the Apollo 13 LM,
008363,000006: ## although several more revisions would follow. It has been
008364,000007: ## reconstructed from a listing of Luminary 131, from which it
008365,000008: ## differs on only two lines in P70-P71. The difference is
008366,000009: ## described in detail in Luminary memo #129, which was used
008367,000010: ## to perform the reconstruction. This file is intended to be a
008368,000011: ## faithful reconstruction, except that the code format has been
008369,000012: ## changed to conform to the requirements of the yaYUL assembler
008370,000013: ## rather than the original YUL assembler.
008371,000014: ## Reference: pp. 208-212
008372,000015: ## Contact: Ron Burkey <info@sandroid.org>.
008373,000016: ## Website: www.ibiblio.org/apollo/index.html
008374,000017: ## Mod history: 05/05/03 RSB. Began transcribing.
008375,000018: ## 05/14/05 RSB Corrected website reference above.
008376,000019: ## 2017-01-06 RSB Page numbers now agree with those on the
008377,000020: ## original harcopy, as opposed to the PDF page
008378,000021: ## numbers in 1701.pdf.
008379,000022: ## 2017-02-22 RSB Proofed comment text using octopus/ProoferComments.
008380,000023: ## 2018-09-04 MAS Copied from Luminary 131 for Luminary 130.
008381,000024:
|
|
Page 208
|
008383,000026:
008384,000027: # PROGRAM NAME: AGS INITIALIZATION (R47)
008385,000028:
008386,000029: # WRITTEN BY: RHODE/KILROY/FOLLETT
008387,000030:
008388,000031: # MOD NO.: 0
008389,000032: # DATE: 23 MARCH 1967
008390,000033: # MOD BY: KILROY
008391,000034:
008392,000035: # MOD NO.: 1
008393,000036: # DATE: 28 OCTOBER 1967
008394,000037: # MOD BY: FOLLETT
008395,000038:
008396,000039: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008397,000040: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008398,000041:
008399,000042: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008400,000043: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008401,000044:
008402,000045: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008403,000046: # REQUESTED DURING THIS PROGRAM
008404,000047:
008405,000048: # LOG SECTION: AGS INITIALIZATION
008406,000049:
008407,000050: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008408,000051: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008409,000052:
008410,000053: # SUBROUTINES
008411,000054: # CALLED:
008412,000055:
008413,000056: # NORMAL EXIT: ENDEXT
008414,000057:
008415,000058: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008416,000059: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008417,000060:
008418,000061: # ERASABLES
008419,000062: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008420,000063: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008421,000064: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008422,000065: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008423,000066:
008424,000067: 05,2447 E4,1600 EBANK= AGSBUFF
008425,000068:
008426,000069: 40,2000 BANK 40
008427,000070: 32,2000 SETLOC R47
008428,000071: 32,2000 BANK
008429,000072:
008430,000073: 32,2005 COUNT* $$/R47
008431,000074:
008432,000075: 32,2005 34737 AGSINIT CAF REFSMBIT
008433,000076: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008434,000077: 32,2007 10000 CCS A
|
|
Page 209
|
008436,000079: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008437,000080: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008438,000081: 32,2012 00220 OCT 220
008439,000082: 32,2013 05472 TC ENDEXT
008440,000083:
008441,000084: 32,2014 00006 NEWAGS EXTEND
008442,000085: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008443,000086: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008444,000087:
008445,000088: 32,2017 00006 REDSPTEM EXTEND
008446,000089: 32,2020 31421 DCA AGSK
008447,000090: 32,2021 53051 DXCH DSPTEMX
008448,000091: 32,2022 32172 AGSDISPK CAF V06N16
008449,000092: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008450,000093: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008451,000094: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008452,000095: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008453,000096: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008454,000097: 32,2030 60154 AD MPAC
008455,000098: 32,2031 00006 EXTEND
008456,000099: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008457,000100:
008458,000101: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008459,000102: 32,2034 31051 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008460,000103: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008461,000104: # DISPLAY THE NEW K
008462,000105:
008463,000106: 32,2036 06042 AGSVCALC TC INTPRET
008464,000107: 32,2037 77614 SET
008465,000108: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008466,000109: 32,2041 77414 SET EXIT
008467,000110: 32,2042 02076 XDSPFLAG
008468,000111:
008469,000112: 32,2043 32172 CAF V06N16
008470,000113: 32,2044 04616 TC BANKCALL
008471,000114: 32,2045 20621 CADR EXDSPRET
008472,000115:
008473,000116: 32,2046 06042 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008474,000117: 32,2047 77634 RTB # TO THE PRESENT TIME
008475,000118: 32,2050 21574 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008476,000119: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008477,000120: 32,2052 27056 LEMPREC
008478,000121: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008479,000122: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008480,000123: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008481,000124: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008482,000125: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008483,000126: 32,2060 27042 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008484,000127: 32,2061 77624 CALL
008485,000128: 32,2062 64132 SCALEVEC
|
|
Page 210
|
008487,000130: 32,2063 16207 STODL AGSBUFF +6
008488,000131: 32,2064 00015 TAT
008489,000132: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008490,000133: 32,2066 02021 AGSK
008491,000134: 32,2067 24175 TSCALE
008492,000135: 32,2070 02215 STORE AGSBUFF +12D
008493,000136: 32,2071 77776 EXIT
008494,000137:
008495,000138: 32,2072 34753 CAF LAGSLIST
008496,000139: 32,2073 54333 TS DNLSTCOD
008497,000140:
008498,000141: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008499,000142: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008500,000143: 32,2076 01736 CADR DELAYJOB
008501,000144:
008502,000145: 32,2077 31321 CA AGSWORD
008503,000146: 32,2100 54333 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008504,000147: 32,2101 34744 CAF IMUSEBIT
008505,000148: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008506,000149: 32,2103 10000 CCS A
008507,000150: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008508,000151: 32,2105 11301 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008509,000152: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008510,000153: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008511,000154: 32,2110 12111 TCF +1
008512,000155: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008513,000156: 32,2112 04616 TC BANKCALL
008514,000157: 32,2113 01736 CADR DELAYJOB
008515,000158: 32,2114 12105 TCF CKSTALL
008516,000159:
008517,000160: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008518,000161: 32,2116 16705 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320 MSECS
008519,000162: 32,2117 04616 TC BANKCALL # WAIT 3SEC FOR COUNTERS TO INCREMENT
008520,000163: 32,2120 17707 CADR IMUSTALL
008521,000164: 32,2121 02122 TC AGSEND
008522,000165: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008523,000166: 32,2123 00054 ADRES NODOFLAG
008524,000167:
008525,000168: 32,2124 32173 CAF V50N16
008526,000169: 32,2125 04616 TC BANKCALL
008527,000170: 32,2126 20342 CADR GOMARK3
008528,000171: 32,2127 15472 TCF ENDEXT
008529,000172: 32,2130 15472 TCF ENDEXT
008530,000173: 32,2131 05472 TC ENDEXT
008531,000174:
008532,000175: 32,2132 64375 SCALEVEC VLOAD MXV
008533,000176: 32,2133 00025 VATT1
008534,000177: 32,2134 01734 REFSMMAT
008535,000178: 32,2135 72561 VXSC VSL2
008536,000179: 32,2136 24202 VSCALE
|
|
Page 211
|
008538,000181: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008539,000182: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008540,000183: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008541,000184: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008542,000185: 32,2143 21773 VECSGNAG
008543,000186: 32,2144 24025 STOVL VATT1
008544,000187: 32,2145 00017 RATT1
008545,000188: 32,2146 74321 MXV VXSC
008546,000189: 32,2147 01734 REFSMMAT
008547,000190: 32,2150 24200 RSCALE
008548,000191: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008549,000192: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008550,000193: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008551,000194: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008552,000195: 32,2155 21773 VECSGNAG
008553,000196: 32,2156 77750 LXA,1
008554,000197: 32,2157 00024 VATT1
008555,000198: 32,2160 72130 SXA,1 LXA,1
008556,000199: 32,2161 00155 MPAC +1
008557,000200: 32,2162 00026 VATT1 +2
008558,000201: 32,2163 72130 SXA,1 LXA,1
008559,000202: 32,2164 00160 MPAC +4
008560,000203: 32,2165 00030 VATT1 +4
008561,000204: 32,2166 43530 SXA,1 RVQ
008562,000205: 32,2167 00162 MPAC +6
008563,000206:
008564,000207: 32,2170 4753 LAGSLIST = ONE
008565,000208: 32,2170 00216 V01N14 VN 0114
008566,000209: 32,2171 14400 V50N00A VN 5000
008567,000210: 32,2172 6010 V00N25 EQUALS OCT31
008568,000211: 32,2172 01420 V06N16 VN 0616
008569,000212: 32,2173 4242 V00N34 EQUALS 34DEC
008570,000213: 32,2173 14420 V50N16 VN 5016
008571,000214: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008572,000215: 32,2176 03720 20SEC DEC 2000 B-14
008573,000216: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008574,000217: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008575,000218: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008576,000219: 32,2205 00000 60000 2OCT 0000060000
008577,000220: 32,2207 00000 60000 2OCT 0000060000
008578,000221: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008579,000222: 32,2213 00000 37777 2OCT 0000037777
|
|
Page 212
|
008581,000224: 32,2215 00000 37777 2OCT 0000037777
008582,000225:
008583,000226: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008584,000227:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc