Source Code
|
These source-code files are part of a reconstructed copy of Luminary 97, the
original release 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 memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. 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 97 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.
|
008132,000002: ## Copyright: Public domain.
008133,000003: ## Filename: AGS_INITIALIZATION.agc
008134,000004: ## Purpose: A section of Luminary revision 97.
008135,000005: ## It is part of the reconstructed source code for the
008136,000006: ## original release of the flight software for the Lunar
008137,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
008138,000008: ## The code has been recreated from a copy of Luminary 99
008139,000009: ## revision 001, using asterisks indicating changed lines in
008140,000010: ## the listing and Luminary Memos #83 and #85, which list
008141,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
008142,000012: ## code has been adapted such that the resulting bugger words
008143,000013: ## exactly match those specified for Luminary 97 in NASA drawing
008144,000014: ## 2021152D, which gives relatively high confidence that the
008145,000015: ## reconstruction is correct.
008146,000016: ## Reference: pp. 206-210
008147,000017: ## Assembler: yaYUL
008148,000018: ## Contact: Ron Burkey <info@sandroid.org>.
008149,000019: ## Website: www.ibiblio.org/apollo/index.html
008150,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
008151,000021:
|
|
Page 206
|
008153,000023:
008154,000024: # PROGRAM NAME: AGS INITIALIZATION (R47)
008155,000025:
008156,000026: # WRITTEN BY: RHODE/KILROY/FOLLETT
008157,000027:
008158,000028: # MOD NO. : 0
008159,000029: # DATE: 23 MARCH 1967
008160,000030: # MOD BY: KILROY
008161,000031:
008162,000032: # MOD NO.: 1
008163,000033: # DATE: 28 OCTOBER 1967
008164,000034: # MOD BY: FOLLETT
008165,000035:
008166,000036: # FUNCT. DESC.: (1) TO PROVIDE THE AGS ABORT ELECTRONICS ASSEMBLY (AEA) WITH THE LEM AND CSM STATE VECTORS
008167,000037: # (POSITION,VELOCITY,TIME) IN LEM IMU COORDINATES BY MEANS OF THE LGC DIGITAL DOWNLINK.
008168,000038:
008169,000039: # (2) TO ZERO THE ICDU, LGC AND AEA GIMBAL ANGLE COUNTERS SIMULTANEOUSLY IN ORDER TO ESTABLISH A
008170,000040: # COMMON ZERO REFERENCE FOR THE MEASUREMENT OF GIMBAL (EULER) ANGLES WHICH DEFINE LEM ATTITUDE
008171,000041:
008172,000042: # (3) TO ESTABLISH THE GROUND ELAPSED TIME OF AEA CLOCK ZERO. (IF AN AEA CLOCK ZERO IS
008173,000043: # REQUESTED DURING THIS PROGRAM
008174,000044:
008175,000045: # LOG SECTION: AGS INITIALIZATION
008176,000046:
008177,000047: # CALLING SEQ: PROGRAM IS ENTERED WHEN ASTRONAUT KEYS V47E ON DSKY.
008178,000048: # R47 MAY BE CALLED AT ANY TIME EXCEPT WHEN ANOTHER EXTENDED VERB IS IN PROGRESS
008179,000049:
008180,000050: # SUBROUTINES
008181,000051: # CALLED:
008182,000052:
008183,000053: # NORMAL EXIT: ENDEXT
008184,000054:
008185,000055: # ALARM/ABORT: ALARM - BAD REFSMMAT - CODE:220
008186,000056: # OPERATOR ERROR IF V47 SELECTED DURING ANOTHER EXTENDED VERB.
008187,000057:
008188,000058: # ERASABLES
008189,000059: # USED: SAMPTIME (2) TIME OF :ENTER: KEYSTROKE
008190,000060: # AGSK (2) GROUND ELAPSED TIME OF THE AEA CLOCK :ZERO:
008191,000061: # AGSBUFF (140) CONTAINS AGS INITIALIZATION DATA (SEE :OUTPUT: BELOW)
008192,000062: # AGSWORD (1) PREVIOUS DOWNLIST SAVED HERE
008193,000063:
008194,000064: 05,2447 E4,1600 EBANK= AGSBUFF
008195,000065:
008196,000066: 40,2000 BANK 40
008197,000067: 32,2000 SETLOC R47
008198,000068: 32,2000 BANK
008199,000069:
008200,000070: 32,2005 COUNT* $$/R47
008201,000071:
008202,000072: 32,2005 34737 AGSINIT CAF REFSMBIT
008203,000073: 32,2006 70077 MASK FLAGWRD3 # CHECK REFSMFLG.
008204,000074: 32,2007 10000 CCS A
|
|
Page 207
|
008206,000076: 32,2010 02017 TC REDSPTEM # REFSMMAT IS OK
008207,000077: 32,2011 05567 TC ALARM # REFSMMAT IS BAD
008208,000078: 32,2012 00220 OCT 220
008209,000079: 32,2013 05472 TC ENDEXT
008210,000080:
008211,000081: 32,2014 00006 NEWAGS EXTEND
008212,000082: 32,2015 30014 DCA SAMPTIME # TIME OF THE :ENTER: KEYSTROKE
008213,000083: 32,2016 53421 DXCH AGSK # BECOMES NEW AEA CLOCK :ZERO:
008214,000084:
008215,000085: 32,2017 00006 REDSPTEM EXTEND
008216,000086: 32,2020 31421 DCA AGSK
008217,000087: 32,2021 53052 DXCH DSPTEMX
008218,000088: 32,2022 32172 AGSDISPK CAF V06N16
008219,000089: 32,2023 04616 TC BANKCALL # R1 = 00XXX. HRS., R2 = 000XX MIN.,
008220,000090: 32,2024 20334 CADR GOMARKF # R3 = 0XX.XX SEC.
008221,000091: 32,2025 05472 TC ENDEXT # TERMINATE RETURN
008222,000092: 32,2026 02036 TC AGSVCALC # PROCEED RETURN
008223,000093: 32,2027 44746 CS BIT6 # IS ENTER VIA A V32
008224,000094: 32,2030 60154 AD MPAC
008225,000095: 32,2031 00006 EXTEND
008226,000096: 32,2032 12014 BZF NEWAGS # YES, USE KEYSTROKE TIME FOR NEW AGSK
008227,000097:
008228,000098: 32,2033 00006 EXTEND # NO, NEW AGSK LOADED VIA V25
008229,000099: 32,2034 31052 DCA DSPTEMX # LOADED INTO DSPTEMX BY KEYING
008230,000100: 32,2035 02016 TC REDSPTEM -1 # V25E FOLLOWED BY HRS.,MINS.,SECS.
008231,000101: # DISPLAY THE NEW K
008232,000102:
008233,000103: 32,2036 06037 AGSVCALC TC INTPRET
008234,000104: 32,2037 77614 SET
008235,000105: 32,2040 01076 NODOFLAG # DONT ALLOW V37
008236,000106: 32,2041 77414 SET EXIT
008237,000107: 32,2042 02076 XDSPFLAG
008238,000108:
008239,000109: 32,2043 32172 CAF V06N16
008240,000110: 32,2044 04616 TC BANKCALL
008241,000111: 32,2045 20620 CADR EXDSPRET
008242,000112:
008243,000113: 32,2046 06037 TC INTPRET # EXTRAPOLATE LEM AND CSM STATE VECTORS
008244,000114: 32,2047 77634 RTB # TO THE PRESENT TIME
008245,000115: 32,2050 21573 LOADTIME # LOAD MPAC WITH TIME2,TIME1
008246,000116: 32,2051 34041 STCALL TDEC1 # CALCULATE LEM STATE VECTOR
008247,000117: 32,2052 27057 LEMPREC
008248,000118: 32,2053 77624 CALL # CALL ROUTINE TO CONVERT TO SM COORDS AND
008249,000119: 32,2054 64132 SCALEVEC # PROVIDE PROPER SCALING
008250,000120: 32,2055 16201 STODL AGSBUFF # (LEMPREC AND CSMPREC LEAVE TDEC1 IN TAT)
008251,000121: 32,2056 00015 TAT # TAT = TIME TO WHICH RATT1 AND VATT1 ARE
008252,000122: 32,2057 34041 STCALL TDEC1 # COMPUTED (CSEC SINCE CLOCK START B-28).
008253,000123: 32,2060 27043 CSMPREC # CALCULATE CSM STATE VECTOR FOR SAME TIME
008254,000124: 32,2061 77624 CALL
008255,000125: 32,2062 64132 SCALEVEC
|
|
Page 208
|
008257,000127: 32,2063 16207 STODL AGSBUFF +6
008258,000128: 32,2064 00015 TAT
008259,000129: 32,2065 56225 DSU DDV # CALCULATE AND STORE THE TIME
008260,000130: 32,2066 02021 AGSK
008261,000131: 32,2067 24175 TSCALE
008262,000132: 32,2070 02215 STORE AGSBUFF +12D
008263,000133: 32,2071 77776 EXIT
008264,000134:
008265,000135: 32,2072 34753 CAF LAGSLIST
008266,000136: 32,2073 54332 TS DNLSTCOD
008267,000137:
008268,000138: 32,2074 32176 CAF 20SEC # DELAY FOR 20 SEC WHILE THE AGS
008269,000139: 32,2075 04616 TC BANKCALL # DOWNLIST IS TRANSMITTED
008270,000140: 32,2076 01735 CADR DELAYJOB
008271,000141:
008272,000142: 32,2077 31324 CA AGSWORD
008273,000143: 32,2100 54332 TS DNLSTCOD # RETURN TO THE OLD DOWNLIST
008274,000144: 32,2101 34744 CAF IMUSEBIT
008275,000145: 32,2102 70074 MASK FLAGWRD0 # CHECK IMUSE FLAG.
008276,000146: 32,2103 10000 CCS A
008277,000147: 32,2104 02122 TC AGSEND # IMU IS BEING USED - DO NOT ZERO
008278,000148: 32,2105 11304 CKSTALL CCS IMUCADR # CHECK FOR IMU USAGE WHICH AVOIDS THE
008279,000149: 32,2106 12111 TCF +3 # IMUSE BIT: I.E., IMU COMPENSATION.
008280,000150: 32,2107 12115 TCF +6 # FREE. GO AHEAD WITH THE IMU ZERO.
008281,000151: 32,2110 12111 TCF +1
008282,000152: 32,2111 34363 +3 CAF TEN # WAIT .1 SEC AND TRY AGAIN.
008283,000153: 32,2112 04616 TC BANKCALL
008284,000154: 32,2113 01735 CADR DELAYJOB
008285,000155: 32,2114 12105 TCF CKSTALL
008286,000156:
008287,000157: 32,2115 04616 +6 TC BANKCALL # IMU IS NOT IN USE
008288,000158: 32,2116 16714 CADR IMUZERO # SET IMU ZERO DISCRETE FOR 320MSECS
008289,000159: 32,2117 04616 TC BANKCALL # WAIT 3 SEC FOR COUNTERS TO INCREMENT
008290,000160: 32,2120 17716 CADR IMUSTALL
008291,000161: 32,2121 02122 TC AGSEND
008292,000162: 32,2122 05516 AGSEND TC DOWNFLAG # ALLOW V37
008293,000163: 32,2123 00054 ADRES NODOFLAG
008294,000164:
008295,000165: 32,2124 32173 CAF V50N16
008296,000166: 32,2125 04616 TC BANKCALL
008297,000167: 32,2126 20342 CADR GOMARK3
008298,000168: 32,2127 15472 TCF ENDEXT
008299,000169: 32,2130 15472 TCF ENDEXT
008300,000170: 32,2131 05472 TC ENDEXT
008301,000171:
008302,000172: 32,2132 64375 SCALEVEC VLOAD MXV
008303,000173: 32,2133 00025 VATT1
008304,000174: 32,2134 01734 REFSMMAT
008305,000175: 32,2135 72561 VXSC VSL2
008306,000176: 32,2136 24202 VSCALE
|
|
Page 209
|
008308,000178: 32,2137 53255 VAD VAD # THIS SECTION ROUNDS THE VECTOR, AND
008309,000179: 32,2140 24204 AGSRND1 # CORRECTS FOR THE FACT THAT THE AGS
008310,000180: 32,2141 24212 AGSRND2 # IS A 2 S COMPLIMENT MACHINE WHILE THE
008311,000181: 32,2142 77634 RTB # LGC IS A 1 S COMPLIMENT MACHINE.
008312,000182: 32,2143 21772 VECSGNAG
008313,000183: 32,2144 24025 STOVL VATT1
008314,000184: 32,2145 00017 RATT1
008315,000185: 32,2146 74321 MXV VXSC
008316,000186: 32,2147 01734 REFSMMAT
008317,000187: 32,2150 24200 RSCALE
008318,000188: 32,2151 53212 VSL8 VAD # AGAIN THIS SECTION ROUNDS. TWO VECTORS
008319,000189: 32,2152 24204 AGSRND1 # ARE ADDED TO DEFEAT ALSIGNAG IN THE
008320,000190: 32,2153 47055 VAD RTB # CASE OF A HIGH-ORDER ZERO COUPLED WITH
008321,000191: 32,2154 24212 AGSRND2 # A LOW ORDER NEGATIVE PART.
008322,000192: 32,2155 21772 VECSGNAG
008323,000193: 32,2156 77750 LXA,1
008324,000194: 32,2157 00024 VATT1
008325,000195: 32,2160 72130 SXA,1 LXA,1
008326,000196: 32,2161 00155 MPAC +1
008327,000197: 32,2162 00026 VATT1 +2
008328,000198: 32,2163 72130 SXA,1 LXA,1
008329,000199: 32,2164 00160 MPAC +4
008330,000200: 32,2165 00030 VATT1 +4
008331,000201: 32,2166 43530 SXA,1 RVQ
008332,000202: 32,2167 00162 MPAC +6
008333,000203:
008334,000204: 32,2170 4753 LAGSLIST = ONE
008335,000205: 32,2170 00216 V01N14 VN 0114
008336,000206: 32,2171 14400 V50N00A VN 5000
008337,000207: 32,2172 6010 V00N25 EQUALS OCT31
008338,000208: 32,2172 01420 V06N16 VN 0616
008339,000209: 32,2173 4242 V00N34 EQUALS 34DEC
008340,000210: 32,2173 14420 V50N16 VN 5016
008341,000211: 32,2174 03100 00000 TSCALE 2DEC 100 B-10 # CSEC TO SEC SCALE FACTOR
008342,000212: 32,2176 03720 20SEC DEC 2000 B-14
008343,000213: 32,2177 15077 05041 RSCALE 2DEC 3.280839 B-3 # METERS TO FEET SCALE FACTOR
008344,000214: 32,2201 24402 25724 VSCALE 2DEC 3.280839 E2 B-9 # METERS/CS TO FEET/SEC SCALE FACTOR
008345,000215: 32,2203 00000 60000 AGSRND1 2OCT 0000060000
008346,000216: 32,2205 00000 60000 2OCT 0000060000
008347,000217: 32,2207 00000 60000 2OCT 0000060000
008348,000218: 32,2211 00000 37777 AGSRND2 2OCT 0000037777
008349,000219: 32,2213 00000 37777 2OCT 0000037777
|
|
Page 210
|
008351,000221: 32,2215 00000 37777 2OCT 0000037777
008352,000222:
008353,000223: 32,2217 30,2000 SBANK= LOWSUPER # FOR SUBSEQUENT LOW 2CADRS.
008354,000224:
End of include-file AGS_INITIALIZATION.agc. Parent file is MAIN.agc