Source Code
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These source-code files are part of a reconstructed copy of Luminary 98, a
development version 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 memo 85, using asterisks
indicating changed lines in the listing as a guide. While no listing of this
version is known to exist, nor are the memory-bank checksums available,
the reconstruction is believed to be correct because it was an an intermediate
step in reconstructing Luminary 97 whose reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152G.
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 98 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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058877,000002: ## Copyright: Public domain.
058878,000003: ## Filename: DAP_INTERFACE_SUBROUTINES.agc
058879,000004: ## Purpose: A section of Luminary revision 98.
058880,000005: ## It is part of the reconstructed source code for the a
058881,000006: ## development version of the flight software for the Lunar
058882,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
058883,000008: ## The code has been recreated from a copy of Luminary 99
058884,000009: ## revision 001, using asterisks indicating changed lines in
058885,000010: ## the listing and Luminary Memo #85, which lists changes between
058886,000011: ## Luminary 98 and 99.
058887,000012: ## Reference: pp. 1406-1409
058888,000013: ## Assembler: yaYUL
058889,000014: ## Contact: Ron Burkey <info@sandroid.org>.
058890,000015: ## Website: www.ibiblio.org/apollo/index.html
058891,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
058892,000017:
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Page 1406
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058894,000019: 20,2123 BANK 20
058895,000020: 20,2000 SETLOC DAPS3
058896,000021: 20,2000 BANK
058897,000022:
058898,000023: 20,2123 E6,1635 EBANK= CDUXD
058899,000024: 20,2123 COUNT* $$/DAPIF
058900,000025:
058901,000026: # MOD 0 DATE 11/15/66 BY GEORGE W. CHERRY
058902,000027: # MOD 1 1/23/67 MODIFICATION BY PETER ADLER
058903,000028:
058904,000029: # FUNCTIONAL DESCRIPTION
058905,000030: # HEREIN ARE A COLLECTION OF SUBROUTINES WHICH ALLOW MISSION CONTROL PROGRAMS TO CONTROL THE MODE
058906,000031: # AND INTERFACE WITH THE DAP.
058907,000032:
058908,000033: # CALLING SEQUENCES
058909,000034: # IN INTERRUPT OR WITH INTERRUPT INHIBITED
058910,000035: # TC IBNKCALL
058911,000036: # FCADR ROUTINE
058912,000037: # IN A JOB WITHOUT INTERRUPT INHIBITED
058913,000038: # INHINT
058914,000039: # TC IBNKCALL
058915,000040: # FCADR ROUTINE
058916,000041: # RELINT
058917,000042:
058918,000043: # OUTPUT
058919,000044: # SEE INDIVIDUAL ROUTINES BELOW
058920,000045:
058921,000046: # DEBRIS
058922,000047: # A, L, AND SOMETIMES MDUETEMP ODE NOT IN PULSES MODE
058923,000048:
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Page 1407
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058925,000050: # SUBROUTINE NAMES:
058926,000051: # SETMAXDB, SETMINDB, RESTORDB, PFLITEDB
058927,000052: # MODIFIED: 30 JANUARY 1968 BY P S WEISSMAN TO CREATE RESTORDB.
058928,000053: # MODIFIED: 1 MARCH 1968 BY P S WEISSMAN TO SAVE EBANK AND CREATE PFLITEDB
058929,000054:
058930,000055: # FUNCTIONAL DESCRIPTION:
058931,000056: # SETMAXDB - SET DEADBAND TO 5.0 DEGREES
058932,000057: # SETMINDB - SET DEADBAND TO 0.3 DEGREE
058933,000058: # RESTORDB - SET DEADBAND TO MAX OR MIN ACCORDING TO SETTING OF DBSELECT BIT OF DAPBOOLS
058934,000059: # PFLITEDB - SET DEADBAND TO 1.0 DEGREE AND ZERO THE COMMANDED ATTITUDE CHANGE AND COMMANDED RATE
058935,000060:
058936,000061: # ALL ENTRIES SET UP A NOVAC JOB TO DO 1/ACCS SO THAT THE TJETLAW SWITCH CURVES ARE POSITIONED TO
058937,000062: # REFLECT THE NEW DEADBAND. IT SHOULD BE NOTED THAT THE DEADBAND REFERS TO THE ATTITUDE IN THE P-, U-, AND V-AXES.
058938,000063:
058939,000064: # SUBROUTINE CALLED: NOVAC
058940,000065:
058941,000066: # CALLING SEQUENCE: SAME AS ABOVE
058942,000067: # OR TC RESTORDB +1 FROM ALLCOAST
058943,000068:
058944,000069: # DEBRIS: A, L, Q, RUPTREG1, (ITEMPS IN NOVAC)
058945,000070:
058946,000071: 20,2123 30111 RESTORDB CAE DAPBOOLS # DETERMINE CREW-SELECTED DEADBAND.
058947,000072: 20,2124 74750 MASK DBSELECT
058948,000073: 20,2125 00006 EXTEND
058949,000074: 20,2126 12140 BZF SETMINDB
058950,000075:
058951,000076: 20,2127 32151 SETMAXDB CAF WIDEDB # SET 5 DEGREE DEADBAND.
058952,000077: 20,2130 55346 +1 TS DB
058953,000078:
058954,000079: 20,2131 00006 EXTEND # SET UP JOB TO RE-POSITION SWITCH CURVES.
058955,000080: 20,2132 22070 QXCH RUPTREG1
058956,000081: 20,2133 37715 CALLACCS CAF PRIO27
058957,000082: 20,2134 05072 TC NOVAC
058958,000083: 20,2135 E6,1537 EBANK= AOSQ
058959,000084: 20,2135 02454 40106 2CADR 1/ACCJOB
058960,000085:
058961,000086: 20,2137 00070 TC RUPTREG1 # RETURN TO CALLER.
058962,000087:
058963,000088: 20,2140 32150 SETMINDB CAF NARROWDB # SET 0.3 DEGREE DEADBAND.
058964,000089: 20,2141 12130 TCF SETMAXDB +1
058965,000090:
058966,000091: 20,2142 00006 PFLITEDB EXTEND # THE RETURN FROM CALLACCS IS TO RUPTREG1.
058967,000092: 20,2143 22070 QXCH RUPTREG1
058968,000093: 20,2144 02153 TC ZATTEROR # ZERO THE ERRORS AND COMMANDED RATES.
058969,000094: 20,2145 32152 CAF POWERDB # SET DB TO 1.0 DEG.
058970,000095: 20,2146 55346 TS DB
058971,000096: 20,2147 12133 TCF CALLACCS # SET UP 1/ACCS AND RETURN TO CALLER.
058972,000097: 20,2150 00155 NARROWDB OCTAL 00155 # 0.3 DEGREE SCALED AT 45.
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Page 1408
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058974,000099: 20,2151 03434 WIDEDB OCTAL 03434 # 5.0 DEGREES SCALED AT 45.
058975,000100: 20,2152 00554 POWERDB DEC .02222 # 1.0 DEGREE SCALED AT 45.
058976,000101:
058977,000102: 20,2153 35015 ZATTEROR CAF EBANK6
058978,000103: 20,2154 56003 XCH EBANK
058979,000104: 20,2155 54001 TS L # SAVE CALLERS EBANK IN L.
058980,000105: 20,2156 30032 CAE CDUX
058981,000106: 20,2157 55635 TS CDUXD
058982,000107: 20,2160 30033 CAE CDUY
058983,000108: 20,2161 55636 TS CDUYD
058984,000109: 20,2162 30034 CAE CDUZ
058985,000110: 20,2163 55637 TS CDUZD
058986,000111: 20,2164 12170 TCF STOPRATE +3
058987,000112:
058988,000113: 20,2165 35015 STOPRATE CAF EBANK6
058989,000114: 20,2166 56003 XCH EBANK
058990,000115: 20,2167 54001 TS L # SAVE CALLERS EBANK IN L.
058991,000116: 20,2170 34755 +3 CAF ZERO
058992,000117: 20,2171 55643 TS OMEGAPD
058993,000118: 20,2172 55644 TS OMEGAQD
058994,000119: 20,2173 55645 TS OMEGARD
058995,000120: 20,2174 55640 TS DELCDUX
058996,000121: 20,2175 55641 TS DELCDUY
058997,000122: 20,2176 55642 TS DELCDUZ
058998,000123: 20,2177 55277 TS DELPEROR
058999,000124: 20,2200 55300 TS DELQEROR
059000,000125: 20,2201 55301 TS DELREROR
059001,000126: 20,2202 22003 LXCH EBANK # RESTORE CALLERS EBANK.
059002,000127: 20,2203 00002 TC Q
059003,000128:
059004,000129: # SUBROUTINE NAME: ALLCOAST
059005,000130: # WILL BE CALLED BY FRESH STARTS AND ENGINE OFF ROUTINES. .
059006,000131:
059007,000132: # CALLING SEQUENCE: (SAME AS ABOVE)
059008,000133:
059009,000134: # EXIT: RETURN TO Q.
059010,000135:
059011,000136: # SUBROUTINES CALLED: STOPRATE, RESTORDB, NOVAC
059012,000137:
059013,000138: # ZERO: (FOR ALL AXES) AOS, ALPHA, AOSTERM, OMEGAD, DELCDU, DELEROR
059014,000139:
059015,000140: # OUTPUT: DRIFTBIT/DAPBOOLS, DB, JOB TO DO 1/ACCS
059016,000141:
059017,000142: # DEBRIS: A, L, Q, RUPTREG1, RUPTREG2, (ITEMPS IN NOVAC)
059018,000143:
059019,000144: 20,2204 00006 ALLCOAST EXTEND # SAVE Q FOR RETURN
059020,000145: 20,2205 22071 QXCH RUPTREG2
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Page 1409
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059022,000147: 20,2206 02165 TC STOPRATE # CLEAR RATE INTERFACE. RETURN WITH A=0
059023,000148: 20,2207 22003 LXCH EBANK # AND L=EBANK6. SAVE CALLERS EBANK.
059024,000149: 20,2210 55537 TS AOSQ
059025,000150: 20,2211 55540 TS AOSQ +1
059026,000151: 20,2212 55541 TS AOSR
059027,000152: 20,2213 55542 TS AOSR +1
059028,000153: 20,2214 55424 TS ALPHAQ # FOR DOWNLIST.
059029,000154: 20,2215 55425 TS ALPHAR
059030,000155: 20,2216 55545 TS AOSQTERM
059031,000156: 20,2217 55546 TS AOSRTERM
059032,000157: 20,2220 22003 LXCH EBANK # RESTORE EBANK (EBANK6 NO LONGER NEEDED)
059033,000158:
059034,000159: 20,2221 40111 CS DAPBOOLS # SET UP DRIFTBIT
059035,000160: 20,2222 74744 MASK DRIFTBIT
059036,000161: 20,2223 26111 ADS DAPBOOLS
059037,000162: 20,2224 02124 TC RESTORDB +1 # RESTORE DEADBANK TO CREW-SELECTED VALUE.
059038,000163:
059039,000164: 20,2225 00071 TC RUPTREG2 # RETURN.
059040,000165:
End of include-file DAP_INTERFACE_SUBROUTINES.agc. Parent file is MAIN.agc