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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058899,000002: ## Copyright: Public domain.
058900,000003: ## Filename: DAP_INTERFACE_SUBROUTINES.agc
058901,000004: ## Purpose: A section of Luminary revision 98.
058902,000005: ## It is part of the reconstructed source code for the a
058903,000006: ## development version of the flight software for the Lunar
058904,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
058905,000008: ## The code has been recreated from a copy of Luminary 99
058906,000009: ## revision 001, using asterisks indicating changed lines in
058907,000010: ## the listing and Luminary Memo #85, which lists changes between
058908,000011: ## Luminary 98 and 99.
058909,000012: ## Reference: pp. 1406-1409
058910,000013: ## Assembler: yaYUL
058911,000014: ## Contact: Ron Burkey <info@sandroid.org>.
058912,000015: ## Website: www.ibiblio.org/apollo/index.html
058913,000016: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
058914,000017:
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Page 1406
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058916,000019: 20,2123 BANK 20
058917,000020: 20,2000 SETLOC DAPS3
058918,000021: 20,2000 BANK
058919,000022:
058920,000023: 20,2123 E6,1635 EBANK= CDUXD
058921,000024: 20,2123 COUNT* $$/DAPIF
058922,000025:
058923,000026: # MOD 0 DATE 11/15/66 BY GEORGE W. CHERRY
058924,000027: # MOD 1 1/23/67 MODIFICATION BY PETER ADLER
058925,000028:
058926,000029: # FUNCTIONAL DESCRIPTION
058927,000030: # HEREIN ARE A COLLECTION OF SUBROUTINES WHICH ALLOW MISSION CONTROL PROGRAMS TO CONTROL THE MODE
058928,000031: # AND INTERFACE WITH THE DAP.
058929,000032:
058930,000033: # CALLING SEQUENCES
058931,000034: # IN INTERRUPT OR WITH INTERRUPT INHIBITED
058932,000035: # TC IBNKCALL
058933,000036: # FCADR ROUTINE
058934,000037: # IN A JOB WITHOUT INTERRUPT INHIBITED
058935,000038: # INHINT
058936,000039: # TC IBNKCALL
058937,000040: # FCADR ROUTINE
058938,000041: # RELINT
058939,000042:
058940,000043: # OUTPUT
058941,000044: # SEE INDIVIDUAL ROUTINES BELOW
058942,000045:
058943,000046: # DEBRIS
058944,000047: # A, L, AND SOMETIMES MDUETEMP ODE NOT IN PULSES MODE
058945,000048:
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Page 1407
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058947,000050: # SUBROUTINE NAMES:
058948,000051: # SETMAXDB, SETMINDB, RESTORDB, PFLITEDB
058949,000052: # MODIFIED: 30 JANUARY 1968 BY P S WEISSMAN TO CREATE RESTORDB.
058950,000053: # MODIFIED: 1 MARCH 1968 BY P S WEISSMAN TO SAVE EBANK AND CREATE PFLITEDB
058951,000054:
058952,000055: # FUNCTIONAL DESCRIPTION:
058953,000056: # SETMAXDB - SET DEADBAND TO 5.0 DEGREES
058954,000057: # SETMINDB - SET DEADBAND TO 0.3 DEGREE
058955,000058: # RESTORDB - SET DEADBAND TO MAX OR MIN ACCORDING TO SETTING OF DBSELECT BIT OF DAPBOOLS
058956,000059: # PFLITEDB - SET DEADBAND TO 1.0 DEGREE AND ZERO THE COMMANDED ATTITUDE CHANGE AND COMMANDED RATE
058957,000060:
058958,000061: # ALL ENTRIES SET UP A NOVAC JOB TO DO 1/ACCS SO THAT THE TJETLAW SWITCH CURVES ARE POSITIONED TO
058959,000062: # REFLECT THE NEW DEADBAND. IT SHOULD BE NOTED THAT THE DEADBAND REFERS TO THE ATTITUDE IN THE P-, U-, AND V-AXES.
058960,000063:
058961,000064: # SUBROUTINE CALLED: NOVAC
058962,000065:
058963,000066: # CALLING SEQUENCE: SAME AS ABOVE
058964,000067: # OR TC RESTORDB +1 FROM ALLCOAST
058965,000068:
058966,000069: # DEBRIS: A, L, Q, RUPTREG1, (ITEMPS IN NOVAC)
058967,000070:
058968,000071: 20,2123 30111 RESTORDB CAE DAPBOOLS # DETERMINE CREW-SELECTED DEADBAND.
058969,000072: 20,2124 74750 MASK DBSELECT
058970,000073: 20,2125 00006 EXTEND
058971,000074: 20,2126 12140 BZF SETMINDB
058972,000075:
058973,000076: 20,2127 32151 SETMAXDB CAF WIDEDB # SET 5 DEGREE DEADBAND.
058974,000077: 20,2130 55346 +1 TS DB
058975,000078:
058976,000079: 20,2131 00006 EXTEND # SET UP JOB TO RE-POSITION SWITCH CURVES.
058977,000080: 20,2132 22070 QXCH RUPTREG1
058978,000081: 20,2133 37715 CALLACCS CAF PRIO27
058979,000082: 20,2134 05072 TC NOVAC
058980,000083: 20,2135 E6,1537 EBANK= AOSQ
058981,000084: 20,2135 02454 40106 2CADR 1/ACCJOB
058982,000085:
058983,000086: 20,2137 00070 TC RUPTREG1 # RETURN TO CALLER.
058984,000087:
058985,000088: 20,2140 32150 SETMINDB CAF NARROWDB # SET 0.3 DEGREE DEADBAND.
058986,000089: 20,2141 12130 TCF SETMAXDB +1
058987,000090:
058988,000091: 20,2142 00006 PFLITEDB EXTEND # THE RETURN FROM CALLACCS IS TO RUPTREG1.
058989,000092: 20,2143 22070 QXCH RUPTREG1
058990,000093: 20,2144 02153 TC ZATTEROR # ZERO THE ERRORS AND COMMANDED RATES.
058991,000094: 20,2145 32152 CAF POWERDB # SET DB TO 1.0 DEG.
058992,000095: 20,2146 55346 TS DB
058993,000096: 20,2147 12133 TCF CALLACCS # SET UP 1/ACCS AND RETURN TO CALLER.
058994,000097: 20,2150 00155 NARROWDB OCTAL 00155 # 0.3 DEGREE SCALED AT 45.
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Page 1408
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058996,000099: 20,2151 03434 WIDEDB OCTAL 03434 # 5.0 DEGREES SCALED AT 45.
058997,000100: 20,2152 00554 POWERDB DEC .02222 # 1.0 DEGREE SCALED AT 45.
058998,000101:
058999,000102: 20,2153 35015 ZATTEROR CAF EBANK6
059000,000103: 20,2154 56003 XCH EBANK
059001,000104: 20,2155 54001 TS L # SAVE CALLERS EBANK IN L.
059002,000105: 20,2156 30032 CAE CDUX
059003,000106: 20,2157 55635 TS CDUXD
059004,000107: 20,2160 30033 CAE CDUY
059005,000108: 20,2161 55636 TS CDUYD
059006,000109: 20,2162 30034 CAE CDUZ
059007,000110: 20,2163 55637 TS CDUZD
059008,000111: 20,2164 12170 TCF STOPRATE +3
059009,000112:
059010,000113: 20,2165 35015 STOPRATE CAF EBANK6
059011,000114: 20,2166 56003 XCH EBANK
059012,000115: 20,2167 54001 TS L # SAVE CALLERS EBANK IN L.
059013,000116: 20,2170 34755 +3 CAF ZERO
059014,000117: 20,2171 55643 TS OMEGAPD
059015,000118: 20,2172 55644 TS OMEGAQD
059016,000119: 20,2173 55645 TS OMEGARD
059017,000120: 20,2174 55640 TS DELCDUX
059018,000121: 20,2175 55641 TS DELCDUY
059019,000122: 20,2176 55642 TS DELCDUZ
059020,000123: 20,2177 55277 TS DELPEROR
059021,000124: 20,2200 55300 TS DELQEROR
059022,000125: 20,2201 55301 TS DELREROR
059023,000126: 20,2202 22003 LXCH EBANK # RESTORE CALLERS EBANK.
059024,000127: 20,2203 00002 TC Q
059025,000128:
059026,000129: # SUBROUTINE NAME: ALLCOAST
059027,000130: # WILL BE CALLED BY FRESH STARTS AND ENGINE OFF ROUTINES. .
059028,000131:
059029,000132: # CALLING SEQUENCE: (SAME AS ABOVE)
059030,000133:
059031,000134: # EXIT: RETURN TO Q.
059032,000135:
059033,000136: # SUBROUTINES CALLED: STOPRATE, RESTORDB, NOVAC
059034,000137:
059035,000138: # ZERO: (FOR ALL AXES) AOS, ALPHA, AOSTERM, OMEGAD, DELCDU, DELEROR
059036,000139:
059037,000140: # OUTPUT: DRIFTBIT/DAPBOOLS, DB, JOB TO DO 1/ACCS
059038,000141:
059039,000142: # DEBRIS: A, L, Q, RUPTREG1, RUPTREG2, (ITEMPS IN NOVAC)
059040,000143:
059041,000144: 20,2204 00006 ALLCOAST EXTEND # SAVE Q FOR RETURN
059042,000145: 20,2205 22071 QXCH RUPTREG2
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Page 1409
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059044,000147: 20,2206 02165 TC STOPRATE # CLEAR RATE INTERFACE. RETURN WITH A=0
059045,000148: 20,2207 22003 LXCH EBANK # AND L=EBANK6. SAVE CALLERS EBANK.
059046,000149: 20,2210 55537 TS AOSQ
059047,000150: 20,2211 55540 TS AOSQ +1
059048,000151: 20,2212 55541 TS AOSR
059049,000152: 20,2213 55542 TS AOSR +1
059050,000153: 20,2214 55424 TS ALPHAQ # FOR DOWNLIST.
059051,000154: 20,2215 55425 TS ALPHAR
059052,000155: 20,2216 55545 TS AOSQTERM
059053,000156: 20,2217 55546 TS AOSRTERM
059054,000157: 20,2220 22003 LXCH EBANK # RESTORE EBANK (EBANK6 NO LONGER NEEDED)
059055,000158:
059056,000159: 20,2221 40111 CS DAPBOOLS # SET UP DRIFTBIT
059057,000160: 20,2222 74744 MASK DRIFTBIT
059058,000161: 20,2223 26111 ADS DAPBOOLS
059059,000162: 20,2224 02124 TC RESTORDB +1 # RESTORE DEADBANK TO CREW-SELECTED VALUE.
059060,000163:
059061,000164: 20,2225 00071 TC RUPTREG2 # RETURN.
059062,000165:
End of include-file DAP_INTERFACE_SUBROUTINES.agc. Parent file is MAIN.agc