Source Code
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These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 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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059022,000002: ## Copyright: Public domain.
059023,000003: ## Filename: DAPIDLER_PROGRAM.agc
059024,000004: ## Purpose: A section of LM131 revision 1.
059025,000005: ## It is part of the reconstructed source code for the final
059026,000006: ## release of the flight software for the Lunar Module's (LM)
059027,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
059028,000008: ## been reconstructed from a listing of Luminary 131 and a dump
059029,000009: ## of a core rope memory module B5, part number 2010802-171,
059030,000010: ## which is the only module different between LM131 revision 1
059031,000011: ## and Luminary 131. The executable generated from this source
059032,000012: ## has been verified against the module dump, so while the names,
059033,000013: ## comments, and ordering may not be exactly correct, the
059034,000014: ## resulting binary is.
059035,000015: ## Reference: pp. 1402-1412
059036,000016: ## Assembler: yaYUL
059037,000017: ## Contact: Ron Burkey <info@sandroid.org>.
059038,000018: ## Website: www.ibiblio.org/apollo/index.html
059039,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
059040,000020:
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Page 1402
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059042,000022: # THE DAPIDLER PROGRAM IS STARTED BY FRESH START AND RESTART. THE DAPIDLER PROGRAM IS DONE 10 TIMES
059043,000023: # PER SECOND UNTIL THE ASTRONAUT DESIRES THE DAP TO WAKE UP, AND THE IMU AND CDUS ARE READY FOR USE BY THE DAP.
059044,000024: # THE NECESSARY INITIALIZATION OF THE DAP IS DONE BY THE DAPIDLER PROGRAM.
059045,000025:
059046,000026: 16,2000 BANK 16
059047,000027: 16,2000 SETLOC DAPS1
059048,000028: 16,2000 BANK
059049,000029:
059050,000030: 16,2000 E6,1536 EBANK= AOSQ
059051,000031:
059052,000032: 16,2000 COUNT* $$/DAPID
059053,000033:
059054,000034: 16,2000 00006 CHEKBITS EXTEND
059055,000035: 16,2001 00031 READ CHAN31 # IF BOTH BIT13 AND BIT14 ARE ONE, THEN
059056,000036: 16,2002 40000 COM # THE MODE SELECT SWITCH IS IN THE OFF
059057,000037: 16,2003 74355 MASK BIT13-14 # POSITION, AND SO THE DAP SHOULD BE OFF,
059058,000038: 16,2004 00006 EXTEND # WITH NO ATTITUDE ERROR DISPLAY.
059059,000039: 16,2005 12157 BZF MOREIDLE
059060,000040:
059061,000041: 16,2006 41300 CS IMODES33
059062,000042: 16,2007 74746 MASK BIT6
059063,000043: 16,2010 10000 CCS A
059064,000044: 16,2011 12206 TCF JUMPDSP
059065,000045: 16,2012 41262 CS RCSFLAGS # IMU NOT USABLE. SET UP INITIALIZATION
059066,000046: 16,2013 74751 MASK BIT3 # FLAG FOR ATT ERROR DISPLAY ROUTINE.
059067,000047: 16,2014 27262 ADS RCSFLAGS
059068,000048: 16,2015 12163 TCF SHUTDOWN
059069,000049:
059070,000050: 16,2016 34742 CHEKMORE CAF BIT10 # BIT 10 OF 30 IS PGNCS CONTROL OF S/C
059071,000051: 16,2017 00006 EXTEND
059072,000052: 16,2020 02030 RAND CHAN30 # BITS IN 30 ARE INVERTED
059073,000053: 16,2021 10000 CCS A
059074,000054: 16,2022 12157 TCF MOREIDLE
059075,000055:
059076,000056: 16,2023 00002 RETURN
059077,000057:
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Page 1403
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059079,000059: # DAPIDLER ENTRY.
059080,000060:
059081,000061: 16,2024 22016 DAPIDLER LXCH BANKRUPT # INTERRUPT LEAD INS (CONTINUED)
059082,000062: 16,2025 00006 EXTEND
059083,000063: 16,2026 22012 QXCH QRUPT
059084,000064:
059085,000065: 16,2027 31262 CA RCSFLAGS
059086,000066: 16,2030 74737 MASK BIT13
059087,000067: 16,2031 10000 CCS A # CHECK IF 1/ACCJOB HAS BEEN SET UP SINCE
059088,000068: 16,2032 12041 TCF CHECKUP # THE LAST FRESH START OR RESTART.
059089,000069: 16,2033 34737 CA BIT13
059090,000070: 16,2034 27262 ADS RCSFLAGS # BIT 13 IS 1.
059091,000071: 16,2035 37720 CAF PRIO27
059092,000072: 16,2036 05072 TC NOVAC # SET UP JOB TO DO A LITTLE INITIALIZATION
059093,000073: 16,2037 E6,1536 EBANK= AOSQ # AND EXECUTE 1/ACCS.
059094,000074: 16,2037 03645 42106 2CADR 1/ACCSET # (WILL BRANCH TO MOREIDLE ON ACCSOKAY)
059095,000075:
059096,000076: 16,2041 02000 CHECKUP TC CHEKBITS # CHECK TO SEE IF LM DAP IS TO GO ON AND
059097,000077: # DO ERROR DISPLAY.
059098,000078:
059099,000079: 16,2042 30111 CAE DAPBOOLS # IF 1/ACCS HAS NOT BEEN COMPLETED, IDLE.
059100,000080: 16,2043 74751 MASK ACCSOKAY # NOTE: ONLY FRESH START AND RESTART
059101,000081: 16,2044 00006 EXTEND # KNOCK THIS BIT DOWN.
059102,000082: 16,2045 12157 BZF MOREIDLE
059103,000083:
059104,000084: 16,2046 04674 STARTDAP TC IBNKCALL # ZERO ATTITUDE ERROR AND DESIRED RATES.
059105,000085: 16,2047 40154 FCADR ZATTEROR
059106,000086: 16,2050 34755 CAF ZERO # ********** INITIALIZE: **********
059107,000087: 16,2051 55524 TS TJP
059108,000088: 16,2052 55525 TS TJU
059109,000089: 16,2053 55526 TS TJV
059110,000090: 16,2054 55421 TS OMEGAP # RATES IN BODY (PILOT) COORDINATES.
059111,000091: 16,2055 55422 TS OMEGAQ
059112,000092: 16,2056 55423 TS OMEGAR
059113,000093: 16,2057 55430 TS TRAPEDP
059114,000094: 16,2060 55431 TS TRAPEDQ
059115,000095: 16,2061 55432 TS TRAPEDR
059116,000096: 16,2062 55536 TS AOSQ # OFFSET ACCELERATION ESTIMATES.
059117,000097: 16,2063 55537 TS AOSQ +1
059118,000098: 16,2064 55540 TS AOSR
059119,000099: 16,2065 55541 TS AOSR +1
059120,000100: 16,2066 55424 TS ALPHAQ # COPIES OF OFFSET ESTIMATES FOR DOWNLIST.
059121,000101: 16,2067 55425 TS ALPHAR
059122,000102: 16,2070 55501 TS NEGUQ
059123,000103: 16,2071 55503 TS NEGUR
059124,000104: 16,2072 55544 TS AOSQTERM # QRAXIS RATE DERIVATION TERMS AND KALMAN
059125,000105: 16,2073 55545 TS AOSRTERM # FILTER INITIALIZATION TERMS.
059126,000106: 16,2074 55510 TS QACCDOT # DESCENT ACCELERATION DERIVATIVE EST.
059127,000107: 16,2075 55512 TS RACCDOT
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Page 1404
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059129,000109: 16,2076 55502 TS ALLOWGTS # AOSTASK FLAG FOR QRAXIS RCS CONTROL USE.
059130,000110: 16,2077 55630 TS COTROLER # DO TRYGTS ON FIRST PASS (WILL GO TO RCS)
059131,000111: 16,2100 55632 TS INGTS # RECOGNIZE FIRST GTS PASS AS SUCH.
059132,000112: 16,2101 55631 TS QGIMTIMR # STOP GIMBAL DRIVES. (PROBABLY WOULD BE
059133,000113: 16,2102 55633 TS RGIMTIMR # GOOD ENOUGH JUST TO INACTIVATE TIMERS)
059134,000114: 16,2103 55460 TS OLDPMIN # MINIMUM IMPULSE MODE ERASABLES
059135,000115: 16,2104 55461 TS OLDQRMIN
059136,000116: 16,2105 55766 TS PJETCTR # INITIALIZE DOCKED JET INHIBITION
059137,000117: 16,2106 55767 TS UJETCTR # COUNTERS
059138,000118: 16,2107 55770 TS VJETCTR
059139,000119: 16,2110 4747 CALLGMBL EQUALS BIT5 # RCSFLAGS INITIALIZATION.
059140,000120: 16,2110 42202 CS MANFLAG
059141,000121: 16,2111 71262 MASK RCSFLAGS # NEGUQ(R) HAVE BEEN GENERATED.
059142,000122: 16,2112 55262 TS RCSFLAGS
059143,000123:
059144,000124: # SET UP "OLD" MEASURED CDU ANGLES:
059145,000125:
059146,000126: 16,2113 00006 EXTEND
059147,000127: 16,2114 30033 DCA CDUX # OLDXFORP AND OLDYFORP
059148,000128: 16,2115 53441 DXCH OLDXFORP
059149,000129: 16,2116 30034 CA CDUZ
059150,000130: 16,2117 55442 TS OLDZFORQ
059151,000131: 16,2120 41262 CS RCSFLAGS
059152,000132: 16,2121 74740 MASK BIT12
059153,000133: 16,2122 27262 ADS RCSFLAGS # BIT 12 SET TO 1.
059154,000134: 16,2123 34751 CA FOUR
059155,000135: 16,2124 55534 TS SKIPU
059156,000136: 16,2125 55535 TS SKIPV
059157,000137: 16,2126 34733 CA POSMAX
059158,000138: 16,2127 54031 TS TIME6
059159,000139: 16,2130 55466 TS T6NEXT
059160,000140: 16,2131 55470 TS T6FURTHA
059161,000141: 16,2132 34755 CA ZERO
059162,000142: 16,2133 55467 TS T6NEXT +1
059163,000143: 16,2134 55471 TS T6FURTHA +1
059164,000144: 16,2135 55465 TS NXT6ADR
059165,000145: 16,2136 55472 TS NEXTP
059166,000146: 16,2137 55473 TS NEXTU
059167,000147: 16,2140 55474 TS NEXTV
059168,000148: 16,2141 44363 CS TEN
059169,000149: 16,2142 55756 TS DAPZRUPT # JASK NOT IN PROGRESS, INITIALIZE NEG.
059170,000150: 16,2143 34752 CA TWO
059171,000151: 16,2144 55433 TS NPTRAPS
059172,000152: 16,2145 55434 TS NQTRAPS
059173,000153: 16,2146 55435 TS NRTRAPS
059174,000154: 16,2147 00006 EXTEND
059175,000155: 16,2150 32205 DCA PAXADIDL
059176,000156: 16,2151 53264 DXCH T5ADR
059177,000157: 16,2152 37732 SETTIME5 CAF MS100
059178,000158: 16,2153 54030 TS TIME5
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Page 1405
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059180,000160: 16,2154 15270 TCF RESUME
059181,000161: 16,2155 E6,1536 EBANK= AOSQ
059182,000162: 16,2155 02024 34106 IDLERADR 2CADR DAPIDLER
059183,000163:
059184,000164: 16,2157 04674 MOREIDLE TC IBNKCALL # CALCULATE Q,R-AXES ATTITUDE ERRORS.
059185,000165: 16,2160 36655 CADR QERRCALC
059186,000166:
059187,000167: 16,2161 04674 TC IBNKCALL
059188,000168: 16,2162 35452 CADR CALCPERR # CALCULATE P AXIS ATTITUDE ERRORS.
059189,000169:
059190,000170: 16,2163 00006 SHUTDOWN EXTEND
059191,000171: 16,2164 32156 DCA IDLERADR
059192,000172: 16,2165 53264 DXCH T5ADR
059193,000173:
059194,000174: 16,2166 34755 CAF ZERO # KILL ANY POSSIBLE JET REQUESTS
059195,000175: 16,2167 55472 TS NEXTP
059196,000176: 16,2170 55473 TS NEXTU
059197,000177: 16,2171 55474 TS NEXTV
059198,000178: 16,2172 00006 EXTEND # COMMAND JETS OFF.
059199,000179: 16,2173 01005 WRITE CHAN5
059200,000180: 16,2174 00006 EXTEND
059201,000181: 16,2175 01006 WRITE CHAN6
059202,000182: 16,2176 42203 CS BGIM23 # TURN TRIM GIMBAL OFF
059203,000183: 16,2177 00006 EXTEND
059204,000184: 16,2200 03012 WAND CHAN12
059205,000185: 16,2201 12152 TCF SETTIME5 # RETURN IN 100 MSEC.
059206,000186:
059207,000187: 16,2202 03021 MANFLAG OCT 03021
059208,000188: 16,2203 07400 BGIM23 OCTAL 07400
059209,000189: 16,2204 E6,1421 EBANK= OMEGAP
059210,000190: 16,2204 02213 34106 PAXADIDL 2CADR PAXIS
059211,000191:
059212,000192: 16,2206 7732 MS100 = OCT37766
059213,000193: 16,2206 0061 COSMG = ITEMP1
059214,000194: 16,2206 00006 JUMPDSP EXTEND # TRANSFER TO BANK 20
059215,000195: 16,2207 32212 DCA DSPCADR # FOR ATTITUDE ERROR DISPLAYS
059216,000196: 16,2210 52006 DTCB
059217,000197:
059218,000198: 16,2211 E6,1760 EBANK= AK
059219,000199: 16,2211 02227 40106 DSPCADR 2CADR ALTDSPLY
059220,000200:
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Page 1406
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059222,000202: 20,2227 BANK 20
059223,000203: 20,2000 SETLOC DAPS3
059224,000204: 20,2000 BANK
059225,000205: 20,2227 COUNT* $$/NEEDL
059226,000206:
059227,000207: # PROGRAM: ALTDSPLY
059228,000208: # MOD 0. 6 DEC 1967
059229,000209: # AUTHOR: CRAIG WORK, DON KEENE, MIT IL
059230,000210: # MOD 3 BY DON KEENE AUG 1, 1968 MOVED PROGRAM TO BANK 20
059231,000211:
059232,000212: # PROGRAM DESCRIPTION:
059233,000213: # ALTDSPLY REVERSES THE DSPLYALT BIT OF RCSFLAGS EACH TIME IT IS CALLED, WHICH IS PRESUMABLY EVERY 100 MS.
059234,000214: # IF THE REVERSED BIT IS ONE, NEEDLER IS CALLED TO DISPLAY ATTITUDE ERRORS. IF THE BIT IS ZERO, THE ATTITUDE ERR-
059235,000215: # ORS ARE CALCULATED AS 1) ESTIMATED RATES (FOLLOWING) IF NEED2FLG = 1, OTHERWISE AS 2) DAP FOLLOWING ERRORS FOR
059236,000216: # NEEDLFLG = 0 AND 3) TOTAL ATTITUDE ERRORS FOR NEEDLFLG = 1.
059237,000217:
059238,000218: # WARNING: ALTDSPLY MAY ONLY BE CALLED WITH INTERRUPT INHIBITED.
059239,000219:
059240,000220: # WARNING: EBANK MUST BE SET TO 6 WHEN USING THIS ROUTINE.
059241,000221:
059242,000222: # INPUT: RCSFLAGS AND 1) IF NEEDLFLG = 0, INPUT PERROR, QERROR, RERROR.
059243,000223: # 2) IF NEEDLFLG = 1, INPUT CPHI,CTHETA,CPSI,CDUX,CDUY,CDUZ,M11,M21,M32,M22,M32. (GPMATRIX)
059244,000224: # 3) IF NEED2FLG = 1, INPUT OMEGAP, OMEGAQ, AND OMEGAR.
059245,000225:
059246,000226: # OUTPUTS: RCSFLAGS WITH DSPLYALT REVERSED, AK, AK1, AK2, + NEEDLER OUTPUTS.
059247,000227:
059248,000228: # ENTRY: TCF ALTDSPLY
059249,000229:
059250,000230: # EXIT: TCF CHEKMORE
059251,000231:
059252,000232: # ALARM OR ABORT EXITS: NONE
059253,000233:
059254,000234: # SUBPROGRAMS CALLED: NEEDLER, OVERSUB2
059255,000235:
059256,000236: # DEBRIS: A, L, AND NEEDLER DEBRIS.
059257,000237:
059258,000238: 20,2227 31262 ALTDSPLY CA RCSFLAGS # INVERT THE DISPLAY ALTERNATION BIT.
059259,000239: 20,2230 54001 TS L
059260,000240: 20,2231 34750 CA DSPLYALT
059261,000241: 20,2232 00006 EXTEND
059262,000242: 20,2233 06001 RXOR LCHAN
059263,000243: 20,2234 55262 TS RCSFLAGS
059264,000244:
059265,000245: 20,2235 74750 MASK DSPLYALT
059266,000246: 20,2236 10000 CCS A # IS ALTERNATION FLAG ZERO?
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Page 1407
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059268,000248: 20,2237 12336 TCF NEEDLER
059269,000249:
059270,000250: 20,2240 40074 CS FLAGWRD0 # CHECK FOR RATE DISPLAY TO ERROR NEEDLES
059271,000251: 20,2241 74735 MASK NEED2BIT # VIA EXTENDED VERB 60
059272,000252: 20,2242 00006 EXTEND
059273,000253: 20,2243 12257 BZF DISPRATE
059274,000254:
059275,000255: 20,2244 30074 CAE FLAGWRD0 # NEEDLFLG WILL INDICATE TOTAL OR DAP AT-
059276,000256: 20,2245 74750 MASK NEEDLBIT # TITUDE ERROR DISPLAY REQUEST.
059277,000257: 20,2246 10000 CCS A
059278,000258: 20,2247 12266 TCF DSPLYTOT # TOTAL ERROR IS NEEDED IN AK, AK +1, AK +2
059279,000259:
059280,000260: 20,2250 41450 CS QERROR # YES. DISPLAY ATT ERRORS ON THE ,-BALL.
059281,000261: 20,2251 55761 TS AK +1 # ERROR COMPLEMENTS ARE INPUT TO NEEDLER.
059282,000262: 20,2252 41452 CS RERROR
059283,000263: 20,2253 55762 TS AK +2
059284,000264: 20,2254 41464 CS PERROR
059285,000265: 20,2255 57760 XCH AK
059286,000266:
059287,000267: 20,2256 12456 TCF RETNMORE # DISPLAY THESE THE NEXT TIME THROUGH
059288,000268:
059289,000269: 20,2257 41422 DISPRATE CS OMEGAQ # LOAD ESTIMATED RATES (FOLLOWING)
059290,000270: 20,2260 55761 TS AK +1
059291,000271: 20,2261 41423 CS OMEGAR
059292,000272: 20,2262 55762 TS AK +2
059293,000273: 20,2263 41421 CS OMEGAP
059294,000274: 20,2264 57760 XCH AK
059295,000275: 20,2265 12456 TCF RETNMORE
059296,000276:
059297,000277: # CALCULATE GIMBAL ANGLE TOTAL ERRORS, RESOLVE INTO PILOT AXES, STORE TOTAL ERRORS FOR NEEDLER. Q-AXIS FIRST.
059298,000278:
059299,000279: 20,2266 00006 DSPLYTOT EXTEND
059300,000280: 20,2267 22061 QXCH ITEMP1 # SAVE Q FOR CHEKBITS RETURN.
059301,000281:
059302,000282: 20,2270 30322 CA CTHETA # DESIRED ATTITUDE, Y-AXIS, 2'S COMP.
059303,000283: 20,2271 00006 EXTEND # SUBTRACT CURRENT ATTITUDE.
059304,000284: 20,2272 20033 MSU CDUY # DIFFERENCE SCALED AT PI, 1'S COMP.
059305,000285: 20,2273 55760 TS AK # SAVE FOR R-ERROR CALCULATION.
059306,000286: 20,2274 00006 EXTEND
059307,000287: 20,2275 71415 MP M21 # (CHTETA-CDUY)*M21 SCALED AT PI RADIANS.
059308,000288: 20,2276 57761 XCH AK +1 # STORE FIRST TERM OF Q ERROR.
059309,000289: 20,2277 30323 CA CPSI # DESIRED ATTITUDE, Z-AXIS, 2'S COMP.
059310,000290: 20,2300 00006 EXTEND # SUBTRACT CURRENT ATTITUDE.
059311,000291: 20,2301 20034 MSU CDUZ # DIFFERENCE SCALED AT PI, 1'S COMP.
059312,000292: 20,2302 55762 TS AK +2 # SAVE Z-AXIS TERM FOR R ERROR CALCULATION
059313,000293: 20,2303 00006 EXTEND
059314,000294: 20,2304 71417 MP M22 # (CPSI-CDUZ)*M22, SCALED AT PI RADIANS.
059315,000295: 20,2305 61761 AD AK +1 # Q ERROR COMPLETE , AT PI RAD.
059316,000296: 20,2306 02451 TC OVERSUB2 # PIN NEEDLES IN CASE OF OVERFLOW.
059317,000297: 20,2307 55761 TS AK +1
059318,000298:
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Page 1408
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059320,000300: # R ERROR CALCULATION NEXT.
059321,000301:
059322,000302: 20,2310 31760 CA AK # Y-AXIS DIFFERENCE STORED BY Q-AXIS CALC.
059323,000303: 20,2311 00006 EXTEND
059324,000304: 20,2312 71416 MP M31 # (CTHETA-CDUY)*M31, SCALED AT PI RADIANS.
059325,000305: 20,2313 57762 XCH AK +2 # FIRST TERM OF R ERROR.
059326,000306: # Z-AXIS DIFFERENCE, STORED BY A CALC. IS
059327,000307: 20,2314 00006 EXTEND # RECOVERED BY THE EXCHANGE.
059328,000308: 20,2315 71420 MP M32 # (CPSI-CDUZ)*M32, SCALED AT PI RADIANS.
059329,000309: 20,2316 61762 AD AK +2 # R ERROR COMPLETE , AT PI RAD.
059330,000310: 20,2317 02451 TC OVERSUB2 # PIN NEEDLES IN CASE OF OVERFLOW.
059331,000311: 20,2320 55762 TS AK +2
059332,000312:
059333,000313: # NOW CALCULATE P ERROR. (NOTE THAT M13 = 1, SCALED AT 1, SO THE MULTIPLICATION IS BY-PASSED.)
059334,000314:
059335,000315: 20,2321 31760 CA AK # Y-AXIS DIFFERENCE STORED BY Q AXIS CALC.
059336,000316: 20,2322 00006 EXTEND
059337,000317: 20,2323 71414 MP M11 # (CTHETA-CDUY)*M11 SCALED AT PI RADIANS.
059338,000318: 20,2324 57760 XCH AK # FIRST TERM OF P ERROR IN AK, AT PI RAD.
059339,000319: 20,2325 30321 CAE CPHI # DESIRED ATTITUDE, X-AXIS, 2'S COMP.
059340,000320: 20,2326 00006 EXTEND # SUBTRACT CURRENT X ATTITUDE.
059341,000321: 20,2327 20032 MSU CDUX # X-AXIS DIFFERENCE, 1'S COMP, AT PI RAD.
059342,000322:
059343,000323: # M13 = 1, SO BYPASS THE MULTIPLICATION.
059344,000324: # EXTEND
059345,000325: # MP M13 (CPHI-CDUX)*M13 SCALED AT PI RADIANS.
059346,000326:
059347,000327: 20,2330 61760 AD AK # P ERROR COMPLETE , SCALED AT PI RAD
059348,000328: 20,2331 02451 TC OVERSUB2 # PIN NEEDLES IN CASE OF OVERFLOW.
059349,000329: 20,2332 55760 TS AK
059350,000330:
059351,000331: 20,2333 00006 EXTEND
059352,000332: 20,2334 22061 QXCH ITEMP1 # RESTORE Q FOR CHEKBITS RETURN.
059353,000333:
059354,000334: 20,2335 12456 TCF RETNMORE # DISPLAY THESE THE NEXT TIME THROUGH
059355,000335:
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Page 1409
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059357,000337: # FDAI ATTITUDE ERROR DISPLAY SUBROUTINE
059358,000338:
059359,000339: # PROGRAM DESCRIPTION: D. KEENE 5/24/67
059360,000340: # MOD 1 BY CRAIG WORK, 12 DEC 67
059361,000341: # MOD 2 BY CRAIG WORK, 6 APRIL 68 CONVERTS ATTITUDE ERROR DISPLAY SCALING FROM 16 7/8 DEG. TO 42 3/16 DEGREES.
059362,000342:
059363,000343: # THIS SUBROUTINE IS USED TO DISPLAY ATTITUDE ERRORS ON THE FDAI VIA THE DIGITAL TO ANALOG CONVERTERS (DACS)
059364,000344: # IN THE CDUS. CARE IS TAKEN TO METER OUT THE APPROPRIATE NUMBER OF PULSES TO THE IMU ERROR COUNTERS AND PREVENT
059365,000345: # OVERFLOW, TO CONTROL THE RELAY SEQUENCING, AND TO AVOID INTERFERENCE WITH THE COARSE ALIGN LOOP WHICH ALSO USES
059366,000346: # THE DACS.
059367,000347:
059368,000348: # CALLING SEQUENCE:
059369,000349: # DURING THE INITIALIZATION SECTION OF THE USER'S PROGRAM, BIT3 OF RCSFLAGS SHOULD BE SET TO INITIATE THE
059370,000350: # TURN-ON SEQUENCE WITHIN THE NEEDLES PROGRAM:
059371,000351: # CS RCSFLAGS IN EBANK6
059372,000352: # MASK BIT3
059373,000353: # ADS RCSFLAGS
059374,000354: # THEREAFTER, THE ATTITUDE ERRORS GENERATED BY THE USER SHOULD BE TRANSFERED TO THE FOLLOWING LOCATIONS IN EBANK6:
059375,000355: # AK SCALED 180 DEGREES NOTE: THESE LOCATIONS ARE SUBJECT
059376,000356: # AK1 SCALED 180 DEGREES TO CHANGE
059377,000357: # AK2 SCALED 180 DEGREES
059378,000358: # FULL SCALED DEFLECTION OF THE NEEDLES CORRESPONDS TO 5 1/16 DEGREES, WHILE 384 BITS IN THE IMU ERROR COUNTER
059379,000359: # CORRESPONDS TO 42 3/16 DEGREES. (DAC MAXIMUM CAPACITY IS 384 BITS.) 46 BITS EFFECTIVELY PIN THE NEEDLES.
059380,000360: # FOR RATE DISPLAY, FULL SCALE NEEDLE DEFLECTION IS 1 17/64 DEG/SEC, AND A FULL COUNTER IS ABOUT 10.5 DEG/SEC.
059381,000361: # A CALL TO NEEDLER WILL THEN UPDATE THE DISPLAY:
059382,000362: # INHINT
059383,000363: # TC IBNKCALL NOTE: EBANK SHOULD BE SET TO E6
059384,000364: # CADR NEEDLER
059385,000365: # RELINT
059386,000366: # THIS PROCESS SHOULD BE REPEATED EACH TIME THE ERRORS ARE UPDATED. AT LEAST 3 PASSES THRU THE PROGRAM ARE
059387,000367: # REQUIRED BEFORE ANYTHING IS ACTUALLY DISPLAYED ON THE ERROR METERS.
059388,000368: # NOTE: EACH CALL TO NEEDLER MUST BE SEPARATED BY AT LEAST 50 MS TO ASSURE PROPER RELAY SEQUENCING.
059389,000369:
059390,000370: # ERASABLE USED:
059391,000371: # AK CDUXCMD
059392,000372: # AK1 CDUYCMD
059393,000373: # AK2 CDUZCMD
059394,000374: # EDRIVEX A,L,Q
059395,000375: # EDRIVEY T5TEMP
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Page 1410
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059397,000377: # EDRIVEZ DINDX
059398,000378:
059399,000379: # SWITCHES: RCSFLAGS BITS 3,2
059400,000380:
059401,000381: # I/O CHANNELS: CHAN12 BIT 4 (COARSE ALIGN - READ ONLY)
059402,000382: # CHAN12 BIT 6 (IMU ERROR COUNTER ENABLE)
059403,000383: # CHAN14 BIT 13,14,15 (DAC ACTIVITY)
059404,000384:
059405,000385: # SIGN CONVENTION< AK = THETAC - THETA
059406,000386: # WHERE THETAC = COMMAND ANGLE
059407,000387: # THETA = PRESENT ANGLE
059408,000388:
059409,000389: 20,2336 31262 NEEDLER CA RCSFLAGS
059410,000390: 20,2337 76245 MASK SIX
059411,000391: 20,2340 00006 EXTEND
059412,000392: 20,2341 12376 BZF NEEDLES3
059413,000393: 20,2342 74751 MASK BIT3
059414,000394: 20,2343 00006 EXTEND
059415,000395: 20,2344 12367 BZF NEEDLER2 # BIT3 = 0, BIT2 = 1
059416,000396:
059417,000397: 20,2345 44746 CS BIT6 # FIRST PASS BIT3 = 1
059418,000398: 20,2346 00006 EXTEND # DISABLE IMU ERROR COUNTER TO ZERO DACS
059419,000399: 20,2347 03012 WAND CHAN12 # MUST WAIT AT LEAST 60 MS BEFORE
059420,000400: 20,2350 44755 NEEDLE11 CS ZERO # ENABLING COUNTERS.
059421,000401: 20,2351 55760 TS AK # ZERO THE INPUTS ON FIRST PASS
059422,000402: 20,2352 55761 TS AK1
059423,000403: 20,2353 55762 TS AK2
059424,000404: 20,2354 55763 TS EDRIVEX # ZERO THE DISPLAY REGISTERS
059425,000405: 20,2355 55764 TS EDRIVEY
059426,000406: 20,2356 55765 TS EDRIVEZ
059427,000407: 20,2357 54050 TS CDUXCMD # ZERO THE OUT COUNTERS
059428,000408: 20,2360 54051 TS CDUYCMD
059429,000409: 20,2361 54052 TS CDUZCMD
059430,000410: 20,2362 46245 CS SIX # RESET RCSFLAGS FOR PASS2
059431,000411: 20,2363 71262 MASK RCSFLAGS
059432,000412: 20,2364 64752 AD BIT2
059433,000413: 20,2365 55262 TS RCSFLAGS
059434,000414: 20,2366 12456 TCF RETNMORE
059435,000415:
059436,000416: 20,2367 34746 NEEDLER2 CAF BIT6 # ENABLE IMU ERROR COUNTERS
059437,000417: 20,2370 00006 EXTEND
059438,000418: 20,2371 05012 WOR CHAN12
059439,000419: 20,2372 46245 CS SIX # RESET RCSFLAGS TO DISPLAY ATTITUDE
059440,000420: 20,2373 71262 MASK RCSFLAGS # ERRORS WAIT AT LEAST 4 MS FOR
059441,000421: 20,2374 55262 TS RCSFLAGS # RELAY CLOSURE
059442,000422: 20,2375 12456 TCF RETNMORE
059443,000423:
059444,000424: 20,2376 34746 NEEDLES3 CAF BIT6 # CHECK TO SEE IF IMU ERROR COUNTER
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Page 1411
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059446,000426: 20,2377 00006 EXTEND # IS ENABLED
059447,000427: 20,2400 02012 RAND CHAN12
059448,000428: 20,2401 10000 CCS A # IF NOT, RE-INITIALIZE NEEDLER.
059449,000429: 20,2402 12407 TCF NEEDLES
059450,000430:
059451,000431: 20,2403 41262 CS RCSFLAGS # SET UP INITIALIZATION FLAG IN RCSFLAGS.
059452,000432: 20,2404 74751 MASK BIT3
059453,000433: 20,2405 27262 ADS RCSFLAGS
059454,000434: 20,2406 12456 TCF RETNMORE
059455,000435:
059456,000436: 20,2407 34752 NEEDLES CAF TWO
059457,000437: 20,2410 54063 DACLOOP TS DINDX
059458,000438: 20,2411 42450 CS ONETENTH # RESCALE INPUTS TO + OR - 1800 DEGREES.
059459,000439: 20,2412 00006 EXTEND
059460,000440: 20,2413 50063 INDEX DINDX
059461,000441: 20,2414 71760 MP AK
059462,000442: 20,2415 54001 TS L
059463,000443: 20,2416 10000 CCS A
059464,000444: 20,2417 32446 CA DACLIMIT
059465,000445: 20,2420 12422 TCF +2
059466,000446: 20,2421 42446 CS DACLIMIT
059467,000447: 20,2422 60001 AD L
059468,000448: 20,2423 54061 TS T5TEMP # OVFLO CHK
059469,000449: 20,2424 12430 TCF +4
059470,000450: 20,2425 50000 INDEX A # ON OVERFLOW LIMIT OUTPUT TO +-384
059471,000451: 20,2426 32446 CAF DACLIMIT
059472,000452: 20,2427 54001 TS L
059473,000453: 20,2430 50063 INDEX DINDX
059474,000454: 20,2431 41763 CS EDRIVEX # CURRENT VALUE OF DAC
059475,000455: 20,2432 60001 AD L
059476,000456: 20,2433 50063 INDEX DINDX
059477,000457: 20,2434 26050 ADS CDUXCMD
059478,000458: 20,2435 50063 INDEX DINDX
059479,000459: 20,2436 23763 LXCH EDRIVEX
059480,000460: 20,2437 10063 CCS DINDX
059481,000461: 20,2440 12410 TCF DACLOOP
059482,000462: 20,2441 37743 CAF 13,14,15
059483,000463: 20,2442 00006 EXTEND
059484,000464: 20,2443 05014 WOR CHAN14 # SET DAC ACTIVITY BITS
059485,000465: 20,2444 12456 TCF RETNMORE
059486,000466:
059487,000467: 20,2445 77177 DEC -384 B-14
059488,000468: 20,2446 37200 DACLIMIT DEC 16000 B-14
059489,000469: 20,2447 00600 DEC 384 B-14
059490,000470:
059491,000471: 20,2450 03146 ONETENTH OCT 03146 # DECIMAL +0.1, SCALED AT 1.
059492,000472: 20,2451 4750 DSPLYALT EQUALS BIT4 # 100 MS ALTERNATION BIT IN RCSFLAGS
059493,000473:
059494,000474: 20,2451 54007 OVERSUB2 TS 7 # RETURNS A UNCHANGED OR LIMITED TO
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Page 1412
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059496,000476: 20,2452 00002 TC Q # POSMAX OR NEGMAX IF A HAS OVERFLOW
059497,000477: 20,2453 50000 INDEX A
059498,000478: 20,2454 44734 CS LIMITS # DUPLICATE CODING IN BANK 16
059499,000479: 20,2455 00002 TC Q
059500,000480:
059501,000481: 20,2456 00006 RETNMORE EXTEND # RETURN TO CHEKMORE
059502,000482: 20,2457 32462 DCA MORECADR
059503,000483: 20,2460 52006 DTCB
059504,000484:
059505,000485: 20,2461 E6,1536 EBANK= AOSQ
059506,000486: 20,2461 02016 34106 MORECADR 2CADR CHEKMORE
059507,000487:
059508,000488:
059509,000489:
059510,000490:
End of include-file DAPIDLER_PROGRAM.agc. Parent file is MAIN.agc