Source Code
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These source-code files are part of a reconstructed copy of Luminary 163, the
first (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 173. Changes
between revision 163 and 173 were backed out, as described by Luminary memos 157
and 158. The reconstruction was verified by matching memory-bank checksums
to those listed in drawing 2021152N. Note that page numbers in the reconstructed
code match those for the baseline log section mentioned in each file's changelog;
the page numbers for a real Luminary 163 listing would be different.
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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059632,000002: ## Copyright: Public domain.
059633,000003: ## Filename: DAP_INTERFACE_SUBROUTINES.agc
059634,000004: ## Purpose: A section of Luminary revision 163.
059635,000005: ## It is part of the reconstructed source code for the first
059636,000006: ## (unflown) release of the flight software for the Lunar
059637,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
059638,000008: ## The code has been recreated from a reconstructed copy of
059639,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
059640,000010: ## It has been adapted such that the resulting bugger words
059641,000011: ## exactly match those specified for Luminary 163 in NASA
059642,000012: ## drawing 2021152N, which gives relatively high confidence
059643,000013: ## that the reconstruction is correct.
059644,000014: ## Reference: pp. 1394-1397
059645,000015: ## Assembler: yaYUL
059646,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059647,000017: ## Website: www.ibiblio.org/apollo/index.html
059648,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
059649,000019:
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Page 1394
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059651,000021: 20,2115 BANK 20
059652,000022: 20,2000 SETLOC DAPS3
059653,000023: 20,2000 BANK
059654,000024:
059655,000025: 20,2115 E6,1634 EBANK= CDUXD
059656,000026: 20,2115 COUNT* $$/DAPIF
059657,000027:
059658,000028: # MOD 0 DATE 11/15/66 BY GEORGE W. CHERRY
059659,000029:
059660,000030: # MOD 1 1/23/67 MODIFICATION BY PETER ADLER
059661,000031:
059662,000032: # FUNCTIONAL DESCRIPTION
059663,000033:
059664,000034: # HEREIN ARE A COLLECTION OF SUBROUTINES WHICH ALLOW MISSION CONTROL PROGRAMS TO CONTROL THE MODE
059665,000035: # AND INTERFACE WITH THE DAP.
059666,000036:
059667,000037: # CALLING SEQUENCES
059668,000038:
059669,000039: # IN INTERRUPT OR WITH INTERRUPT INHIBITED
059670,000040: # TC IBNKCALL
059671,000041: # FCADR ROUTINE
059672,000042:
059673,000043: # IN A JOB WITHOUT INTERRUPT INHIBITED
059674,000044: # INHINT
059675,000045: # TC IBNKCALL
059676,000046: # FCADR ROUTINE
059677,000047: # RELINT
059678,000048:
059679,000049: # OUTPUT
059680,000050:
059681,000051: # SEE INDIVIDUAL ROUTINES BELOW
059682,000052:
059683,000053: # DEBRIS
059684,000054:
059685,000055: # A,L, AND SOMETIMES MDUETEMP ODE NOT IN PULSES MODE
059686,000056:
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Page 1395
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059688,000058: # SUBROUTINE NAMES:
059689,000059: # SETMAXDB, SETMINDB, RESTORDB, PFLITEDB
059690,000060:
059691,000061: # MODIFIED: 30 JANUARY 1968 BY P S WEISSMAN TO CREATE RESTORDB.
059692,000062:
059693,000063: # MODIFIED: 1 MARCH 1968 BY P S WEISSMAN TO SAVE EBANK AND CREATE PFLITEDB
059694,000064:
059695,000065: # FUNCTIONAL DESCRIPTION:
059696,000066: # SETMAXDB - SET DEADBAND TO 5.0 DEGREES
059697,000067: # SETMINDB - SET DEADBAND TO 0.3 DEGREE
059698,000068: # RESTORDB - SET DEADBAND TO .3,1, OR 5 ACCORDING TO BITS 4 AND 5 OF DAPBOOLS
059699,000069: # PFLITEDB - SET DEADBAND TO 1.0 DEGREE AND ZERO THE COMMANDED ATTITUDE CHANGE AND COMMANDED RATE
059700,000070: # ALL ENTRIES SET UP A NOVAC JOB TO DO 1/ACCS SO THAT THE TJETLAW SWITCH CURVES ARE POSITIONED TO
059701,000071: # REFLECT THE NEW DEADBAND. IT SHOULD BE NOTED THAT THE DEADBAND REFERS TO THE ATTITUDE IN THE P-,U-,AND V-AXES.
059702,000072:
059703,000073: # SUBROUTINE CALLED: NOVAC
059704,000074:
059705,000075: # CALLING SEQUENCE: SAME AS ABOVE
059706,000076: # OR TC RESTORDB +1 FROM ALLCOAST
059707,000077: # DEBRIS: A, L, Q, RUPTREG1, (ITEMPS IN NOVAC)
059708,000078:
059709,000079: 20,2115 30111 RESTORDB CAE DAPBOOLS # DETERMINE CREW-SELECTED DEADBAND.
059710,000080: 20,2116 74747 MASK DBSLECT2 # CHECK FOR MAX DB (5 DEG)
059711,000081: 20,2117 00006 EXTEND
059712,000082: 20,2120 12122 BZF +2
059713,000083: 20,2121 12130 TCF SETMAXDB # BIT5 DAPBOOLS IS SET - CREW WANTS 5 DEG
059714,000084: 20,2122 30111 CAE DAPBOOLS
059715,000085: 20,2123 74750 MASK DBSELECT # CHECK FOR 1 DEG DEADBAND SELECTION
059716,000086: 20,2124 00006 EXTEND
059717,000087: 20,2125 12141 BZF SETMINDB
059718,000088:
059719,000089: 20,2126 32153 CAF POWERDB # BIT4 DAPBOOLS IS SET - CREW WANTS 1 DEG
059720,000090: 20,2127 12131 TCF SETMAXDB +1
059721,000091: 20,2130 32152 SETMAXDB CAF WIDEDB # SET 5 DEGREE DEADBAND.
059722,000092: 20,2131 55343 +1 TS DB
059723,000093:
059724,000094: 20,2132 00006 EXTEND # SET UP JOB TO RE-POSITION SWITCH CURVES.
059725,000095: 20,2133 22070 QXCH RUPTREG1
059726,000096: 20,2134 37720 CALLACCS CAF PRIO27
059727,000097: 20,2135 05072 TC NOVAC
059728,000098: 20,2136 E6,1536 EBANK= AOSQ
059729,000099: 20,2136 03635 42106 2CADR 1/ACCJOB
059730,000100:
059731,000101:
059732,000102: 20,2140 00070 TC RUPTREG1 # RETURN TO CALLER.
059733,000103:
059734,000104: 20,2141 32151 SETMINDB CAF NARROWDB # SET 0.3 DEGREE DEADBAND.
059735,000105: 20,2142 12131 TCF SETMAXDB +1
059736,000106:
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Page 1396
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059738,000108: 20,2143 00006 PFLITEDB EXTEND # THE RETURN FROM CALLACCS IS TO RUPTREG1.
059739,000109: 20,2144 22070 QXCH RUPTREG1
059740,000110: 20,2145 02154 TC ZATTEROR # ZERO THE ERRORS AND COMMANDED RATES.
059741,000111: 20,2146 32153 CAF POWERDB # SET DB TO 1.0 DEG.
059742,000112: 20,2147 55343 TS DB
059743,000113: 20,2150 12134 TCF CALLACCS # SET UP 1/ACCS AND RETURN TO CALLER.
059744,000114: 20,2151 00155 NARROWDB OCTAL 00155 # 0.3 DEGREE SCALED AT 45.
059745,000115: 20,2152 03434 WIDEDB OCTAL 03434 # 5.0 DEGREES SCALED AT 45.
059746,000116: 20,2153 00554 POWERDB DEC .02222 # 1.0 DEGREE SCALED AT 45.
059747,000117:
059748,000118:
059749,000119: 20,2154 35015 ZATTEROR CAF EBANK6
059750,000120: 20,2155 56003 XCH EBANK
059751,000121: 20,2156 54001 TS L # SAVE CALLERS EBANK IN L.
059752,000122: 20,2157 30032 CAE CDUX
059753,000123: 20,2160 55634 TS CDUXD
059754,000124: 20,2161 30033 CAE CDUY
059755,000125: 20,2162 55635 TS CDUYD
059756,000126: 20,2163 30034 CAE CDUZ
059757,000127: 20,2164 55636 TS CDUZD
059758,000128: 20,2165 12171 TCF STOPRATE +3
059759,000129:
059760,000130:
059761,000131: 20,2166 35015 STOPRATE CAF EBANK6
059762,000132: 20,2167 56003 XCH EBANK
059763,000133: 20,2170 54001 TS L # SAVE CALLERS EBANK IN L.
059764,000134: 20,2171 34755 +3 CAF ZERO
059765,000135: 20,2172 55642 TS OMEGAPD
059766,000136: 20,2173 55643 TS OMEGAQD
059767,000137: 20,2174 55644 TS OMEGARD
059768,000138: 20,2175 55637 TS DELCDUX
059769,000139: 20,2176 55640 TS DELCDUY
059770,000140: 20,2177 55641 TS DELCDUZ
059771,000141: 20,2200 55274 TS DELPEROR
059772,000142: 20,2201 55275 TS DELQEROR
059773,000143: 20,2202 55276 TS DELREROR
059774,000144: 20,2203 22003 LXCH EBANK # RESTORE CALLERS EBANK.
059775,000145: 20,2204 00002 TC Q
059776,000146:
059777,000147: # SUBROUTINE NAME: ALLCOAST
059778,000148:
059779,000149: # WILL BE CALLED BY FRESH STARTS AND ENGINE OFF ROUTINES. .
059780,000150:
059781,000151: # CALLING SEQUENCE: (SAME AS ABOVE)
059782,000152:
059783,000153: # EXIT: RETURN TO Q.
059784,000154:
059785,000155: # SUBROUTINES CALLED: STOPRATE, RESTORDB, NOVAC
059786,000156:
059787,000157: # ZERO: (FOR ALL AXES) AOS, ALPHA, AOSTERM, OMEGAD, DELCDU, DELEROR
059788,000158:
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Page 1397
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059790,000160: # OUTPUT: DRIFTBIT/DAPBOOLS, DB, JOB TO DO 1/ACCS
059791,000161:
059792,000162: # DEBRIS: A, L, Q, RUPTREG1, RUPTREG2, (ITEMPS IN NOVAC)
059793,000163:
059794,000164: 20,2205 00006 ALLCOAST EXTEND # SAVE Q FOR RETURN
059795,000165: 20,2206 22071 QXCH RUPTREG2
059796,000166: 20,2207 02166 TC STOPRATE # CLEAR RATE INTERFACE. RETURN WITH A=0
059797,000167: 20,2210 22003 LXCH EBANK # AND L=EBANK6. SAVE CALLERS EBANK.
059798,000168: 20,2211 55536 TS AOSQ
059799,000169: 20,2212 55537 TS AOSQ +1
059800,000170: 20,2213 55540 TS AOSR
059801,000171: 20,2214 55541 TS AOSR +1
059802,000172: 20,2215 55424 TS ALPHAQ # FOR DOWNLIST.
059803,000173: 20,2216 55425 TS ALPHAR
059804,000174: 20,2217 55544 TS AOSQTERM
059805,000175: 20,2220 55545 TS AOSRTERM
059806,000176: 20,2221 22003 LXCH EBANK # RESTORE EBANK (EBANK6 NO LONGER NEEDED)
059807,000177:
059808,000178: 20,2222 40111 CS DAPBOOLS # SET UP DRIFTBIT
059809,000179: 20,2223 74744 MASK DRIFTBIT
059810,000180: 20,2224 26111 ADS DAPBOOLS
059811,000181: 20,2225 02116 TC RESTORDB +1 # RESTORE DEADBANK TO CREW-SELECTED VALUE.
059812,000182:
059813,000183: 20,2226 00071 TC RUPTREG2 # RETURN.
End of include-file DAP_INTERFACE_SUBROUTINES.agc. Parent file is MAIN.agc