Source Code
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These source-code files are part of a reconstructed copy of Luminary 178, the
final release of the Apollo 14 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Zerlina 56, Luminary 210, and
Luminary 131, previously transcribed from digitized copies of those programs.
The code was created by combining the three, using Zerlina 56 as a base, since
it was based off of Luminary 183. The differences between the three were
carefully merged using the Luminary memos as a guide, with all changes made
after Luminary 178 being backed out. 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 178 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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059801,000002: ## Copyright: Public domain.
059802,000003: ## Filename: DAP_INTERFACE_SUBROUTINES.agc
059803,000004: ## Purpose: A section of Luminary revision 178.
059804,000005: ## It is part of the reconstructed source code for the final
059805,000006: ## release of the flight software for the Lunar Module's
059806,000007: ## (LM) Apollo Guidance Computer (AGC) for Apollo 14. The
059807,000008: ## code has been recreated from copies of Zerlina 56, Luminary
059808,000009: ## 210, and Luminary 131, as well as many Luminary memos.
059809,000010: ## It has been adapted such that the resulting bugger words
059810,000011: ## exactly match those specified for Luminary 178 in NASA
059811,000012: ## drawing 2021152N, which gives relatively high confidence
059812,000013: ## that the reconstruction is correct.
059813,000014: ## Reference: pp. 1394-1397
059814,000015: ## Assembler: yaYUL
059815,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059816,000017: ## Website: www.ibiblio.org/apollo/index.html
059817,000018: ## Mod history: 2019-08-14 MAS Created from Zerlina 56.
059818,000019:
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Page 1394
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059820,000021: 20,2115 BANK 20
059821,000022: 20,2000 SETLOC DAPS3
059822,000023: 20,2000 BANK
059823,000024:
059824,000025: 20,2115 E6,1634 EBANK= CDUXD
059825,000026: 20,2115 COUNT* $$/DAPIF
059826,000027:
059827,000028: # MOD 0 DATE 11/15/66 BY GEORGE W. CHERRY
059828,000029:
059829,000030: # MOD 1 1/23/67 MODIFICATION BY PETER ADLER
059830,000031:
059831,000032: # FUNCTIONAL DESCRIPTION
059832,000033:
059833,000034: # HEREIN ARE A COLLECTION OF SUBROUTINES WHICH ALLOW MISSION CONTROL PROGRAMS TO CONTROL THE MODE
059834,000035: # AND INTERFACE WITH THE DAP.
059835,000036:
059836,000037: # CALLING SEQUENCES
059837,000038:
059838,000039: # IN INTERRUPT OR WITH INTERRUPT INHIBITED
059839,000040: # TC IBNKCALL
059840,000041: # FCADR ROUTINE
059841,000042:
059842,000043: # IN A JOB WITHOUT INTERRUPT INHIBITED
059843,000044: # INHINT
059844,000045: # TC IBNKCALL
059845,000046: # FCADR ROUTINE
059846,000047: # RELINT
059847,000048:
059848,000049: # OUTPUT
059849,000050:
059850,000051: # SEE INDIVIDUAL ROUTINES BELOW
059851,000052:
059852,000053: # DEBRIS
059853,000054:
059854,000055: # A,L, AND SOMETIMES MDUETEMP ODE NOT IN PULSES MODE
059855,000056:
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Page 1395
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059857,000058: # SUBROUTINE NAMES:
059858,000059: # SETMAXDB, SETMINDB, RESTORDB, PFLITEDB
059859,000060:
059860,000061: # MODIFIED: 30 JANUARY 1968 BY P S WEISSMAN TO CREATE RESTORDB.
059861,000062:
059862,000063: # MODIFIED: 1 MARCH 1968 BY P S WEISSMAN TO SAVE EBANK AND CREATE PFLITEDB
059863,000064:
059864,000065: # FUNCTIONAL DESCRIPTION:
059865,000066: # SETMAXDB - SET DEADBAND TO 5.0 DEGREES
059866,000067: # SETMINDB - SET DEADBAND TO 0.3 DEGREE
059867,000068: # RESTORDB - SET DEADBAND TO .3,1, OR 5 ACCORDING TO BITS 4 AND 5 OF DAPBOOLS
059868,000069: # PFLITEDB - SET DEADBAND TO 1.0 DEGREE AND ZERO THE COMMANDED ATTITUDE CHANGE AND COMMANDED RATE
059869,000070: # ALL ENTRIES SET UP A NOVAC JOB TO DO 1/ACCS SO THAT THE TJETLAW SWITCH CURVES ARE POSITIONED TO
059870,000071: # REFLECT THE NEW DEADBAND. IT SHOULD BE NOTED THAT THE DEADBAND REFERS TO THE ATTITUDE IN THE P-,U-,AND V-AXES.
059871,000072:
059872,000073: # SUBROUTINE CALLED: NOVAC
059873,000074:
059874,000075: # CALLING SEQUENCE: SAME AS ABOVE
059875,000076: # OR TC RESTORDB +1 FROM ALLCOAST
059876,000077: # DEBRIS: A, L, Q, RUPTREG1, (ITEMPS IN NOVAC)
059877,000078:
059878,000079: 20,2115 30111 RESTORDB CAE DAPBOOLS # DETERMINE CREW-SELECTED DEADBAND.
059879,000080: 20,2116 74747 MASK DBSLECT2 # CHECK FOR MAX DB (5 DEG)
059880,000081: 20,2117 00006 EXTEND
059881,000082: 20,2120 12122 BZF +2
059882,000083: 20,2121 12130 TCF SETMAXDB # BIT5 DAPBOOLS IS SET - CREW WANTS 5 DEG
059883,000084: 20,2122 30111 CAE DAPBOOLS
059884,000085: 20,2123 74750 MASK DBSELECT # CHECK FOR 1 DEG DEADBAND SELECTION
059885,000086: 20,2124 00006 EXTEND
059886,000087: 20,2125 12141 BZF SETMINDB
059887,000088:
059888,000089: 20,2126 32153 CAF POWERDB # BIT4 DAPBOOLS IS SET - CREW WANTS 1 DEG
059889,000090: 20,2127 12131 TCF SETMAXDB +1
059890,000091: 20,2130 32152 SETMAXDB CAF WIDEDB # SET 5 DEGREE DEADBAND.
059891,000092: 20,2131 55343 +1 TS DB
059892,000093:
059893,000094: 20,2132 00006 EXTEND # SET UP JOB TO RE-POSITION SWITCH CURVES.
059894,000095: 20,2133 22070 QXCH RUPTREG1
059895,000096: 20,2134 37720 CALLACCS CAF PRIO27
059896,000097: 20,2135 05072 TC NOVAC
059897,000098: 20,2136 E6,1536 EBANK= AOSQ
059898,000099: 20,2136 03430 42106 2CADR 1/ACCJOB
059899,000100:
059900,000101:
059901,000102: 20,2140 00070 TC RUPTREG1 # RETURN TO CALLER.
059902,000103:
059903,000104: 20,2141 32151 SETMINDB CAF NARROWDB # SET 0.3 DEGREE DEADBAND.
059904,000105: 20,2142 12131 TCF SETMAXDB +1
059905,000106:
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Page 1396
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059907,000108: 20,2143 00006 PFLITEDB EXTEND # THE RETURN FROM CALLACCS IS TO RUPTREG1.
059908,000109: 20,2144 22070 QXCH RUPTREG1
059909,000110: 20,2145 02154 TC ZATTEROR # ZERO THE ERRORS AND COMMANDED RATES.
059910,000111: 20,2146 32153 CAF POWERDB # SET DB TO 1.0 DEG.
059911,000112: 20,2147 55343 TS DB
059912,000113: 20,2150 12134 TCF CALLACCS # SET UP 1/ACCS AND RETURN TO CALLER.
059913,000114: 20,2151 00155 NARROWDB OCTAL 00155 # 0.3 DEGREE SCALED AT 45.
059914,000115: 20,2152 03434 WIDEDB OCTAL 03434 # 5.0 DEGREES SCALED AT 45.
059915,000116: 20,2153 00554 POWERDB DEC .02222 # 1.0 DEGREE SCALED AT 45.
059916,000117:
059917,000118:
059918,000119: 20,2154 35015 ZATTEROR CAF EBANK6
059919,000120: 20,2155 56003 XCH EBANK
059920,000121: 20,2156 54001 TS L # SAVE CALLERS EBANK IN L.
059921,000122: 20,2157 30032 CAE CDUX
059922,000123: 20,2160 55634 TS CDUXD
059923,000124: 20,2161 30033 CAE CDUY
059924,000125: 20,2162 55635 TS CDUYD
059925,000126: 20,2163 30034 CAE CDUZ
059926,000127: 20,2164 55636 TS CDUZD
059927,000128: 20,2165 12171 TCF STOPRATE +3
059928,000129:
059929,000130:
059930,000131: 20,2166 35015 STOPRATE CAF EBANK6
059931,000132: 20,2167 56003 XCH EBANK
059932,000133: 20,2170 54001 TS L # SAVE CALLERS EBANK IN L.
059933,000134: 20,2171 34755 +3 CAF ZERO
059934,000135: 20,2172 55642 TS OMEGAPD
059935,000136: 20,2173 55643 TS OMEGAQD
059936,000137: 20,2174 55644 TS OMEGARD
059937,000138: 20,2175 55637 TS DELCDUX
059938,000139: 20,2176 55640 TS DELCDUY
059939,000140: 20,2177 55641 TS DELCDUZ
059940,000141: 20,2200 55274 TS DELPEROR
059941,000142: 20,2201 55275 TS DELQEROR
059942,000143: 20,2202 55276 TS DELREROR
059943,000144: 20,2203 22003 LXCH EBANK # RESTORE CALLERS EBANK.
059944,000145: 20,2204 00002 TC Q
059945,000146:
059946,000147: # SUBROUTINE NAME: ALLCOAST
059947,000148:
059948,000149: # WILL BE CALLED BY FRESH STARTS AND ENGINE OFF ROUTINES. .
059949,000150:
059950,000151: # CALLING SEQUENCE: (SAME AS ABOVE)
059951,000152:
059952,000153: # EXIT: RETURN TO Q.
059953,000154:
059954,000155: # SUBROUTINES CALLED: STOPRATE, RESTORDB, NOVAC
059955,000156:
059956,000157: # ZERO: (FOR ALL AXES) AOS, ALPHA, AOSTERM, OMEGAD, DELCDU, DELEROR
059957,000158:
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Page 1397
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059959,000160: # OUTPUT: DRIFTBIT/DAPBOOLS, DB, JOB TO DO 1/ACCS
059960,000161:
059961,000162: # DEBRIS: A, L, Q, RUPTREG1, RUPTREG2, (ITEMPS IN NOVAC)
059962,000163:
059963,000164: 20,2205 00006 ALLCOAST EXTEND # SAVE Q FOR RETURN
059964,000165: 20,2206 22071 QXCH RUPTREG2
059965,000166: 20,2207 02166 TC STOPRATE # CLEAR RATE INTERFACE. RETURN WITH A=0
059966,000167: 20,2210 22003 LXCH EBANK # AND L=EBANK6. SAVE CALLERS EBANK.
059967,000168: 20,2211 55536 TS AOSQ
059968,000169: 20,2212 55537 TS AOSQ +1
059969,000170: 20,2213 55540 TS AOSR
059970,000171: 20,2214 55541 TS AOSR +1
059971,000172: 20,2215 55424 TS ALPHAQ # FOR DOWNLIST.
059972,000173: 20,2216 55425 TS ALPHAR
059973,000174: 20,2217 55544 TS AOSQTERM
059974,000175: 20,2220 55545 TS AOSRTERM
059975,000176: 20,2221 22003 LXCH EBANK # RESTORE EBANK (EBANK6 NO LONGER NEEDED)
059976,000177:
059977,000178: 20,2222 40111 CS DAPBOOLS # SET UP DRIFTBIT
059978,000179: 20,2223 74744 MASK DRIFTBIT
059979,000180: 20,2224 26111 ADS DAPBOOLS
059980,000181: 20,2225 02116 TC RESTORDB +1 # RESTORE DEADBANK TO CREW-SELECTED VALUE.
059981,000182:
059982,000183: 20,2226 00071 TC RUPTREG2 # RETURN.
End of include-file DAP_INTERFACE_SUBROUTINES.agc. Parent file is MAIN.agc