Source Code
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These source-code files are part of a reconstructed copy of Luminary 98, a
development version of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Luminary 99 revision 1 previously
transcribed from a digitized copy of that program. The code was then updated
by undoing changes described in original Luminary memo 85, using asterisks
indicating changed lines in the listing as a guide. While no listing of this
version is known to exist, nor are the memory-bank checksums available,
the reconstruction is believed to be correct because it was an an intermediate
step in reconstructing Luminary 97 whose reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152G.
Note that page numbers in the reconstructed code match those on the Luminary 099
revision 001 printout, although the added code would likely have changed page
numbers for a real Luminary 98 listing.
Comments from the original source code are prefixed with a single '#' symbol,
whereas comments added later are prefixed by "##" or "###". Report any errors
noted by creating an
issue report at the Virtual AGC
project's GitHub repository.
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008096,000002: ## Copyright: Public domain.
008097,000003: ## Filename: AGS_INITIALIZATION.agc
008098,000004: ## Purpose: A section of Luminary revision 98.
008099,000005: ## It is part of the reconstructed source code for the a
008100,000006: ## development version of the flight software for the Lunar
008101,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
008102,000008: ## The code has been recreated from a copy of Luminary 99
008103,000009: ## revision 001, using asterisks indicating changed lines in
008104,000010: ## the listing and Luminary Memo #85, which lists changes between
008105,000011: ## Luminary 98 and 99.
008106,000012: ## Reference: pp. 206-210
008107,000013: ## Assembler: yaYUL
008108,000014: ## Contact: Ron Burkey <info@sandroid.org>.
008109,000015: ## Website: www.ibiblio.org/apollo/index.html
008110,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
008111,000017:
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Page 206
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008113,000019:
008114,000020: # PROGRAM NAME: AGS INITIALIZATION (R47)
008115,000021:
008116,000022: # WRITTEN BY: RHODE/KILROY/FOLLETT
008117,000023:
008118,000024: # MOD NO. : 0
008119,000025: # DATE: 23 MARCH 1967
008120,000026: # MOD BY: KILROY
008121,000027:
008122,000028: # MOD NO.: 1
008123,000029: # DATE: 28 OCTOBER 1967
008124,000030: # MOD BY: FOLLETT
008125,000031:
008126,000032: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008127,000033: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008128,000034:
008129,000035: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008130,000036: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008131,000037:
008132,000038: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008133,000039: # REQUESTED DURING THIS PROGRAM
008134,000040:
008135,000041: # LOG SECTION: AGS INITIALIZATION
008136,000042:
008137,000043: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008138,000044: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008139,000045:
008140,000046: # SUBROUTINES
008141,000047: # CALLED:
008142,000048:
008143,000049: # NORMAL EXIT: ENDEXT
008144,000050:
008145,000051: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008146,000052: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008147,000053:
008148,000054: # ERASABLES
008149,000055: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008150,000056: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008151,000057: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008152,000058: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008153,000059:
008154,000060: 05,2447 E4,1600 EBANK= AGSBUFF
008155,000061:
008156,000062: 40,2000 BANK 40
008157,000063: 32,2000 SETLOC R47
008158,000064: 32,2000 BANK
008159,000065:
008160,000066: 32,2005 COUNT* $$/R47
008161,000067:
008162,000068: 32,2005 34737 AGSINIT CAF REFSMBIT
008163,000069: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008164,000070: 32,2007 10000 CCS A
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Page 207
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008166,000072: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008167,000073: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008168,000074: 32,2012 00220 OCT 220
008169,000075: 32,2013 05472 TC ENDEXT
008170,000076:
008171,000077: 32,2014 00006 NEWAGS EXTEND
008172,000078: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008173,000079: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008174,000080:
008175,000081: 32,2017 00006 REDSPTEM EXTEND
008176,000082: 32,2020 31421 DCA AGSK
008177,000083: 32,2021 53052 DXCH DSPTEMX
008178,000084: 32,2022 32172 AGSDISPK CAF V06N16
008179,000085: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008180,000086: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008181,000087: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008182,000088: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008183,000089: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008184,000090: 32,2030 60154 AD MPAC
008185,000091: 32,2031 00006 EXTEND
008186,000092: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008187,000093:
008188,000094: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008189,000095: 32,2034 31052 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008190,000096: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008191,000097: # DISPLAY THE NEW K
008192,000098:
008193,000099: 32,2036 06037 AGSVCALC TC INTPRET
008194,000100: 32,2037 77614 SET
008195,000101: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008196,000102: 32,2041 77414 SET EXIT
008197,000103: 32,2042 02076 XDSPFLAG
008198,000104:
008199,000105: 32,2043 32172 CAF V06N16
008200,000106: 32,2044 04616 TC BANKCALL
008201,000107: 32,2045 20620 CADR EXDSPRET
008202,000108:
008203,000109: 32,2046 06037 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008204,000110: 32,2047 77634 RTB # TO THE PRESENT TIME
008205,000111: 32,2050 21573 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008206,000112: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008207,000113: 32,2052 27057 LEMPREC
008208,000114: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008209,000115: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008210,000116: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008211,000117: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008212,000118: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008213,000119: 32,2060 27043 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008214,000120: 32,2061 77624 CALL
008215,000121: 32,2062 64132 SCALEVEC
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008217,000123: 32,2063 16207 STODL AGSBUFF +6
008218,000124: 32,2064 00015 TAT
008219,000125: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008220,000126: 32,2066 02021 AGSK
008221,000127: 32,2067 24175 TSCALE
008222,000128: 32,2070 02215 STORE AGSBUFF +12D
008223,000129: 32,2071 77776 EXIT
008224,000130:
008225,000131: 32,2072 34753 CAF LAGSLIST
008226,000132: 32,2073 54332 TS DNLSTCOD
008227,000133:
008228,000134: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008229,000135: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008230,000136: 32,2076 01735 CADR DELAYJOB
008231,000137:
008232,000138: 32,2077 31324 CA AGSWORD
008233,000139: 32,2100 54332 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008234,000140: 32,2101 34744 CAF IMUSEBIT
008235,000141: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008236,000142: 32,2103 10000 CCS A
008237,000143: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008238,000144: 32,2105 11304 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008239,000145: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008240,000146: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008241,000147: 32,2110 12111 TCF +1
008242,000148: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008243,000149: 32,2112 04616 TC BANKCALL
008244,000150: 32,2113 01735 CADR DELAYJOB
008245,000151: 32,2114 12105 TCF CKSTALL
008246,000152:
008247,000153: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008248,000154: 32,2116 16714 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320MSECS
008249,000155: 32,2117 04616 TC BANKCALL # WAIT 3 SEC FOR COUNTERS TO INCREMENT
008250,000156: 32,2120 17716 CADR IMUSTALL
008251,000157: 32,2121 02122 TC AGSEND
008252,000158: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008253,000159: 32,2123 00054 ADRES NODOFLAG
008254,000160:
008255,000161: 32,2124 32173 CAF V50N16
008256,000162: 32,2125 04616 TC BANKCALL
008257,000163: 32,2126 20342 CADR GOMARK3
008258,000164: 32,2127 15472 TCF ENDEXT
008259,000165: 32,2130 15472 TCF ENDEXT
008260,000166: 32,2131 05472 TC ENDEXT
008261,000167:
008262,000168: 32,2132 64375 SCALEVEC VLOAD MXV
008263,000169: 32,2133 00025 VATT1
008264,000170: 32,2134 01734 REFSMMAT
008265,000171: 32,2135 72561 VXSC VSL2
008266,000172: 32,2136 24202 VSCALE
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008268,000174: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008269,000175: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008270,000176: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008271,000177: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008272,000178: 32,2143 21772 VECSGNAG
008273,000179: 32,2144 24025 STOVL VATT1
008274,000180: 32,2145 00017 RATT1
008275,000181: 32,2146 74321 MXV VXSC
008276,000182: 32,2147 01734 REFSMMAT
008277,000183: 32,2150 24200 RSCALE
008278,000184: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008279,000185: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008280,000186: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008281,000187: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008282,000188: 32,2155 21772 VECSGNAG
008283,000189: 32,2156 77750 LXA,1
008284,000190: 32,2157 00024 VATT1
008285,000191: 32,2160 72130 SXA,1 LXA,1
008286,000192: 32,2161 00155 MPAC +1
008287,000193: 32,2162 00026 VATT1 +2
008288,000194: 32,2163 72130 SXA,1 LXA,1
008289,000195: 32,2164 00160 MPAC +4
008290,000196: 32,2165 00030 VATT1 +4
008291,000197: 32,2166 43530 SXA,1 RVQ
008292,000198: 32,2167 00162 MPAC +6
008293,000199:
008294,000200: 32,2170 4753 LAGSLIST = ONE
008295,000201: 32,2170 00216 V01N14 VN 0114
008296,000202: 32,2171 14400 V50N00A VN 5000
008297,000203: 32,2172 6010 V00N25 EQUALS OCT31
008298,000204: 32,2172 01420 V06N16 VN 0616
008299,000205: 32,2173 4242 V00N34 EQUALS 34DEC
008300,000206: 32,2173 14420 V50N16 VN 5016
008301,000207: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008302,000208: 32,2176 03720 20SEC DEC 2000 B-14
008303,000209: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008304,000210: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008305,000211: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008306,000212: 32,2205 00000 60000 2OCT 0000060000
008307,000213: 32,2207 00000 60000 2OCT 0000060000
008308,000214: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008309,000215: 32,2213 00000 37777 2OCT 0000037777
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008311,000217: 32,2215 00000 37777 2OCT 0000037777
008312,000218:
008313,000219: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008314,000220:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc