Source Code
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This is an attempt to recreate Luminary 99 Rev 2, otherwise known as LUM99R2, from Luminary 99 Rev 1 and ephemeris data from Luminary 116. The differences are confined to the last 10-12 lines of the CONTROLLED CONSTANTS. Luminary 99 Rev 1 source-code was transcribed from a printout in the MIT Museum, while Luminary 116 source code was transcribed from a printout belonging to Don Eyles. AGC developer James Kernan, the "rope mother" for the Apollo 11 Lunar Module's AGC, explains as follows: "At the last minute, Dan Lickly, our chief engineer, appeared with ephemerides updates and it took two tries to get it right. The result was that we created Lum99 Revision 1 and Lum99 Revision 2." It is suspected that the former is what's in the MIT Museum, and the latter is what we are trying to recreate here. As for which revision actually flew in Apollo 11, all of the other available surviving evidence points to Rev 1 rather than to Rev 2, so we're just not sure! |
008126,000002: ## Copyright: Public domain.
008127,000003: ## Filename: AGS_INITIALIZATION.agc
008128,000004: ## Purpose: Part of the source code for Luminary 1A build 099.
008129,000005: ## It is part of the source code for the Lunar Module's (LM)
008130,000006: ## Apollo Guidance Computer (AGC), for Apollo 11.
008131,000007: ## Assembler: yaYUL
008132,000008: ## Contact: Hartmuth Gutsche <hgutsche@xplornet.com>.
008133,000009: ## Website: www.ibiblio.org/apollo.
008134,000010: ## Pages: 206-210
008135,000011: ## Mod history: 2009-05-19 HG Transcribed from page images.
008136,000012: ## 2016-12-13 RSB Proofed text comments with octopus/ProoferComments
008137,000013: ## and corrected the errors found.
008138,000014: ## 2017-03-03 RSB Snapshot of Luminary 99 Rev 1.
008139,000015: ## 2017-03-14 RSB Comment-text fixes identified in 5-way
008140,000016: ## side-by-side diff of Luminary 69/99/116/131/210.
008141,000017:
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008143,000019:
008144,000020: # PROGRAM NAME: AGS INITIALIZATION (R47)
008145,000021:
008146,000022: # WRITTEN BY: RHODE/KILROY/FOLLETT
008147,000023:
008148,000024: # MOD NO. : 0
008149,000025: # DATE: 23 MARCH 1967
008150,000026: # MOD BY: KILROY
008151,000027:
008152,000028: # MOD NO.: 1
008153,000029: # DATE: 28 OCTOBER 1967
008154,000030: # MOD BY: FOLLETT
008155,000031:
008156,000032: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008157,000033: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008158,000034:
008159,000035: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008160,000036: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008161,000037:
008162,000038: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008163,000039: # REQUESTED DURING THIS PROGRAM
008164,000040:
008165,000041: # LOG SECTION: AGS INITIALIZATION
008166,000042:
008167,000043: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008168,000044: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008169,000045:
008170,000046: # SUBROUTINES
008171,000047: # CALLED:
008172,000048:
008173,000049: # NORMAL EXIT: ENDEXT
008174,000050:
008175,000051: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008176,000052: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008177,000053:
008178,000054: # ERASABLES
008179,000055: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008180,000056: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008181,000057: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008182,000058: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008183,000059:
008184,000060: 05,2447 E4,1600 EBANK= AGSBUFF
008185,000061:
008186,000062: 40,2000 BANK 40
008187,000063: 32,2000 SETLOC R47
008188,000064: 32,2000 BANK
008189,000065:
008190,000066: 32,2005 COUNT* $$/R47
008191,000067:
008192,000068: 32,2005 34737 AGSINIT CAF REFSMBIT
008193,000069: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008194,000070: 32,2007 10000 CCS A
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008196,000072: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008197,000073: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008198,000074: 32,2012 00220 OCT 220
008199,000075: 32,2013 05472 TC ENDEXT
008200,000076:
008201,000077: 32,2014 00006 NEWAGS EXTEND
008202,000078: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008203,000079: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008204,000080:
008205,000081: 32,2017 00006 REDSPTEM EXTEND
008206,000082: 32,2020 31421 DCA AGSK
008207,000083: 32,2021 53052 DXCH DSPTEMX
008208,000084: 32,2022 32172 AGSDISPK CAF V06N16
008209,000085: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008210,000086: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008211,000087: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008212,000088: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008213,000089: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008214,000090: 32,2030 60154 AD MPAC
008215,000091: 32,2031 00006 EXTEND
008216,000092: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008217,000093:
008218,000094: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008219,000095: 32,2034 31052 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008220,000096: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008221,000097: # DISPLAY THE NEW K
008222,000098:
008223,000099: 32,2036 06037 AGSVCALC TC INTPRET
008224,000100: 32,2037 77614 SET
008225,000101: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008226,000102: 32,2041 77414 SET EXIT
008227,000103: 32,2042 02076 XDSPFLAG
008228,000104:
008229,000105: 32,2043 32172 CAF V06N16
008230,000106: 32,2044 04616 TC BANKCALL
008231,000107: 32,2045 20620 CADR EXDSPRET
008232,000108:
008233,000109: 32,2046 06037 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008234,000110: 32,2047 77634 RTB # TO THE PRESENT TIME
008235,000111: 32,2050 21573 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008236,000112: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008237,000113: 32,2052 27057 LEMPREC
008238,000114: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008239,000115: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008240,000116: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008241,000117: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008242,000118: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008243,000119: 32,2060 27043 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008244,000120: 32,2061 77624 CALL
008245,000121: 32,2062 64132 SCALEVEC
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008247,000123: 32,2063 16207 STODL AGSBUFF +6
008248,000124: 32,2064 00015 TAT
008249,000125: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008250,000126: 32,2066 02021 AGSK
008251,000127: 32,2067 24175 TSCALE
008252,000128: 32,2070 02215 STORE AGSBUFF +12D
008253,000129: 32,2071 77776 EXIT
008254,000130:
008255,000131: 32,2072 34753 CAF LAGSLIST
008256,000132: 32,2073 54332 TS DNLSTCOD
008257,000133:
008258,000134: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008259,000135: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008260,000136: 32,2076 01735 CADR DELAYJOB
008261,000137:
008262,000138: 32,2077 31324 CA AGSWORD
008263,000139: 32,2100 54332 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008264,000140: 32,2101 34744 CAF IMUSEBIT
008265,000141: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008266,000142: 32,2103 10000 CCS A
008267,000143: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008268,000144: 32,2105 11304 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008269,000145: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008270,000146: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008271,000147: 32,2110 12111 TCF +1
008272,000148: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008273,000149: 32,2112 04616 TC BANKCALL
008274,000150: 32,2113 01735 CADR DELAYJOB
008275,000151: 32,2114 12105 TCF CKSTALL
008276,000152:
008277,000153: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008278,000154: 32,2116 16714 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320MSECS
008279,000155: 32,2117 04616 TC BANKCALL # WAIT 3 SEC FOR COUNTERS TO INCREMENT
008280,000156: 32,2120 17716 CADR IMUSTALL
008281,000157: 32,2121 02122 TC AGSEND
008282,000158: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008283,000159: 32,2123 00054 ADRES NODOFLAG
008284,000160:
008285,000161: 32,2124 32173 CAF V50N16
008286,000162: 32,2125 04616 TC BANKCALL
008287,000163: 32,2126 20342 CADR GOMARK3
008288,000164: 32,2127 15472 TCF ENDEXT
008289,000165: 32,2130 15472 TCF ENDEXT
008290,000166: 32,2131 05472 TC ENDEXT
008291,000167:
008292,000168: 32,2132 64375 SCALEVEC VLOAD MXV
008293,000169: 32,2133 00025 VATT1
008294,000170: 32,2134 01734 REFSMMAT
008295,000171: 32,2135 72561 VXSC VSL2
008296,000172: 32,2136 24202 VSCALE
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008298,000174: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008299,000175: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008300,000176: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008301,000177: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008302,000178: 32,2143 21772 VECSGNAG
008303,000179: 32,2144 24025 STOVL VATT1
008304,000180: 32,2145 00017 RATT1
008305,000181: 32,2146 74321 MXV VXSC
008306,000182: 32,2147 01734 REFSMMAT
008307,000183: 32,2150 24200 RSCALE
008308,000184: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008309,000185: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008310,000186: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008311,000187: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008312,000188: 32,2155 21772 VECSGNAG
008313,000189: 32,2156 77750 LXA,1
008314,000190: 32,2157 00024 VATT1
008315,000191: 32,2160 72130 SXA,1 LXA,1
008316,000192: 32,2161 00155 MPAC +1
008317,000193: 32,2162 00026 VATT1 +2
008318,000194: 32,2163 72130 SXA,1 LXA,1
008319,000195: 32,2164 00160 MPAC +4
008320,000196: 32,2165 00030 VATT1 +4
008321,000197: 32,2166 43530 SXA,1 RVQ
008322,000198: 32,2167 00162 MPAC +6
008323,000199:
008324,000200: 32,2170 4753 LAGSLIST = ONE
008325,000201: 32,2170 00216 V01N14 VN 0114
008326,000202: 32,2171 14400 V50N00A VN 5000
008327,000203: 32,2172 6010 V00N25 EQUALS OCT31
008328,000204: 32,2172 01420 V06N16 VN 0616
008329,000205: 32,2173 4242 V00N34 EQUALS 34DEC
008330,000206: 32,2173 14420 V50N16 VN 5016
008331,000207: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008332,000208: 32,2176 03720 20SEC DEC 2000 B-14
008333,000209: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008334,000210: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008335,000211: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008336,000212: 32,2205 00000 60000 2OCT 0000060000
008337,000213: 32,2207 00000 60000 2OCT 0000060000
008338,000214: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008339,000215: 32,2213 00000 37777 2OCT 0000037777
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008341,000217: 32,2215 00000 37777 2OCT 0000037777
008342,000218:
008343,000219: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008344,000220:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc