Source Code
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These source-code files are part of a reconstructed copy of Luminary 96, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with reconstructed source code for Luminary 97. Changes
between revisions 96 and 97 were backed out, as described by anomal report LNY-59.
transcribed from a digitized copy of that program. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
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 96 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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008123,000002: ## Copyright: Public domain.
008124,000003: ## Filename: AGS_INITIALIZATION.agc
008125,000004: ## Purpose: A section of Luminary revision 96.
008126,000005: ## It is part of the reconstructed source code for the
008127,000006: ## original release of the flight software for the Lunar
008128,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
008129,000008: ## The code has been recreated from a previously reconstructed
008130,000009: ## copy of Luminary 97 by undoing changes described in anomaly
008131,000010: ## report LNY-59. The code has been adapted such that the
008132,000011: ## resulting bugger words exactly match those specified for
008133,000012: ## Luminary 96 in NASA drawing 2021152D, which gives relatively
008134,000013: ## high confidence that the reconstruction is correct.
008135,000014: ## Reference: pp. 206-210
008136,000015: ## Assembler: yaYUL
008137,000016: ## Contact: Ron Burkey <info@sandroid.org>.
008138,000017: ## Website: www.ibiblio.org/apollo/index.html
008139,000018: ## Mod history: 2019-08-04 MAS Created from Luminary 97.
008140,000019:
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Page 206
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008142,000021:
008143,000022: # PROGRAM NAME: AGS INITIALIZATION (R47)
008144,000023:
008145,000024: # WRITTEN BY: RHODE/KILROY/FOLLETT
008146,000025:
008147,000026: # MOD NO. : 0
008148,000027: # DATE: 23 MARCH 1967
008149,000028: # MOD BY: KILROY
008150,000029:
008151,000030: # MOD NO.: 1
008152,000031: # DATE: 28 OCTOBER 1967
008153,000032: # MOD BY: FOLLETT
008154,000033:
008155,000034: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008156,000035: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008157,000036:
008158,000037: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008159,000038: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008160,000039:
008161,000040: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008162,000041: # REQUESTED DURING THIS PROGRAM
008163,000042:
008164,000043: # LOG SECTION: AGS INITIALIZATION
008165,000044:
008166,000045: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008167,000046: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008168,000047:
008169,000048: # SUBROUTINES
008170,000049: # CALLED:
008171,000050:
008172,000051: # NORMAL EXIT: ENDEXT
008173,000052:
008174,000053: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008175,000054: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008176,000055:
008177,000056: # ERASABLES
008178,000057: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008179,000058: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008180,000059: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008181,000060: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008182,000061:
008183,000062: 05,2447 E4,1600 EBANK= AGSBUFF
008184,000063:
008185,000064: 40,2000 BANK 40
008186,000065: 32,2000 SETLOC R47
008187,000066: 32,2000 BANK
008188,000067:
008189,000068: 32,2005 COUNT* $$/R47
008190,000069:
008191,000070: 32,2005 34737 AGSINIT CAF REFSMBIT
008192,000071: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008193,000072: 32,2007 10000 CCS A
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008195,000074: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008196,000075: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008197,000076: 32,2012 00220 OCT 220
008198,000077: 32,2013 05472 TC ENDEXT
008199,000078:
008200,000079: 32,2014 00006 NEWAGS EXTEND
008201,000080: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008202,000081: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008203,000082:
008204,000083: 32,2017 00006 REDSPTEM EXTEND
008205,000084: 32,2020 31421 DCA AGSK
008206,000085: 32,2021 53052 DXCH DSPTEMX
008207,000086: 32,2022 32172 AGSDISPK CAF V06N16
008208,000087: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008209,000088: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008210,000089: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008211,000090: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008212,000091: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008213,000092: 32,2030 60154 AD MPAC
008214,000093: 32,2031 00006 EXTEND
008215,000094: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008216,000095:
008217,000096: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008218,000097: 32,2034 31052 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008219,000098: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008220,000099: # DISPLAY THE NEW K
008221,000100:
008222,000101: 32,2036 06037 AGSVCALC TC INTPRET
008223,000102: 32,2037 77614 SET
008224,000103: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008225,000104: 32,2041 77414 SET EXIT
008226,000105: 32,2042 02076 XDSPFLAG
008227,000106:
008228,000107: 32,2043 32172 CAF V06N16
008229,000108: 32,2044 04616 TC BANKCALL
008230,000109: 32,2045 20620 CADR EXDSPRET
008231,000110:
008232,000111: 32,2046 06037 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008233,000112: 32,2047 77634 RTB # TO THE PRESENT TIME
008234,000113: 32,2050 21573 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008235,000114: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008236,000115: 32,2052 27057 LEMPREC
008237,000116: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008238,000117: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008239,000118: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008240,000119: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008241,000120: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008242,000121: 32,2060 27043 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008243,000122: 32,2061 77624 CALL
008244,000123: 32,2062 64132 SCALEVEC
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008246,000125: 32,2063 16207 STODL AGSBUFF +6
008247,000126: 32,2064 00015 TAT
008248,000127: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008249,000128: 32,2066 02021 AGSK
008250,000129: 32,2067 24175 TSCALE
008251,000130: 32,2070 02215 STORE AGSBUFF +12D
008252,000131: 32,2071 77776 EXIT
008253,000132:
008254,000133: 32,2072 34753 CAF LAGSLIST
008255,000134: 32,2073 54332 TS DNLSTCOD
008256,000135:
008257,000136: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008258,000137: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008259,000138: 32,2076 01735 CADR DELAYJOB
008260,000139:
008261,000140: 32,2077 31324 CA AGSWORD
008262,000141: 32,2100 54332 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008263,000142: 32,2101 34744 CAF IMUSEBIT
008264,000143: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008265,000144: 32,2103 10000 CCS A
008266,000145: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008267,000146: 32,2105 11304 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008268,000147: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008269,000148: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008270,000149: 32,2110 12111 TCF +1
008271,000150: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008272,000151: 32,2112 04616 TC BANKCALL
008273,000152: 32,2113 01735 CADR DELAYJOB
008274,000153: 32,2114 12105 TCF CKSTALL
008275,000154:
008276,000155: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008277,000156: 32,2116 16714 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320MSECS
008278,000157: 32,2117 04616 TC BANKCALL # WAIT 3 SEC FOR COUNTERS TO INCREMENT
008279,000158: 32,2120 17716 CADR IMUSTALL
008280,000159: 32,2121 02122 TC AGSEND
008281,000160: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008282,000161: 32,2123 00054 ADRES NODOFLAG
008283,000162:
008284,000163: 32,2124 32173 CAF V50N16
008285,000164: 32,2125 04616 TC BANKCALL
008286,000165: 32,2126 20342 CADR GOMARK3
008287,000166: 32,2127 15472 TCF ENDEXT
008288,000167: 32,2130 15472 TCF ENDEXT
008289,000168: 32,2131 05472 TC ENDEXT
008290,000169:
008291,000170: 32,2132 64375 SCALEVEC VLOAD MXV
008292,000171: 32,2133 00025 VATT1
008293,000172: 32,2134 01734 REFSMMAT
008294,000173: 32,2135 72561 VXSC VSL2
008295,000174: 32,2136 24202 VSCALE
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008297,000176: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008298,000177: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008299,000178: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008300,000179: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008301,000180: 32,2143 21772 VECSGNAG
008302,000181: 32,2144 24025 STOVL VATT1
008303,000182: 32,2145 00017 RATT1
008304,000183: 32,2146 74321 MXV VXSC
008305,000184: 32,2147 01734 REFSMMAT
008306,000185: 32,2150 24200 RSCALE
008307,000186: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008308,000187: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008309,000188: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008310,000189: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008311,000190: 32,2155 21772 VECSGNAG
008312,000191: 32,2156 77750 LXA,1
008313,000192: 32,2157 00024 VATT1
008314,000193: 32,2160 72130 SXA,1 LXA,1
008315,000194: 32,2161 00155 MPAC +1
008316,000195: 32,2162 00026 VATT1 +2
008317,000196: 32,2163 72130 SXA,1 LXA,1
008318,000197: 32,2164 00160 MPAC +4
008319,000198: 32,2165 00030 VATT1 +4
008320,000199: 32,2166 43530 SXA,1 RVQ
008321,000200: 32,2167 00162 MPAC +6
008322,000201:
008323,000202: 32,2170 4753 LAGSLIST = ONE
008324,000203: 32,2170 00216 V01N14 VN 0114
008325,000204: 32,2171 14400 V50N00A VN 5000
008326,000205: 32,2172 6010 V00N25 EQUALS OCT31
008327,000206: 32,2172 01420 V06N16 VN 0616
008328,000207: 32,2173 4242 V00N34 EQUALS 34DEC
008329,000208: 32,2173 14420 V50N16 VN 5016
008330,000209: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008331,000210: 32,2176 03720 20SEC DEC 2000 B-14
008332,000211: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008333,000212: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008334,000213: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008335,000214: 32,2205 00000 60000 2OCT 0000060000
008336,000215: 32,2207 00000 60000 2OCT 0000060000
008337,000216: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008338,000217: 32,2213 00000 37777 2OCT 0000037777
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008340,000219: 32,2215 00000 37777 2OCT 0000037777
008341,000220:
008342,000221: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008343,000222:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc