Source Code
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These source-code files are part of a reconstructed copy of Luminary 96, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with reconstructed source code for Luminary 97. Changes
between revisions 96 and 97 were backed out, as described by anomal report LNY-59.
transcribed from a digitized copy of that program. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
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 96 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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059032,000002: ## Copyright: Public domain.
059033,000003: ## Filename: DAP_INTERFACE_SUBROUTINES.agc
059034,000004: ## Purpose: A section of Luminary revision 96.
059035,000005: ## It is part of the reconstructed source code for the
059036,000006: ## original release of the flight software for the Lunar
059037,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
059038,000008: ## The code has been recreated from a previously reconstructed
059039,000009: ## copy of Luminary 97 by undoing changes described in anomaly
059040,000010: ## report LNY-59. The code has been adapted such that the
059041,000011: ## resulting bugger words exactly match those specified for
059042,000012: ## Luminary 96 in NASA drawing 2021152D, which gives relatively
059043,000013: ## high confidence that the reconstruction is correct.
059044,000014: ## Reference: pp. 1406-1409
059045,000015: ## Assembler: yaYUL
059046,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059047,000017: ## Website: www.ibiblio.org/apollo/index.html
059048,000018: ## Mod history: 2019-08-04 MAS Created from Luminary 97.
059049,000019:
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Page 1406
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059051,000021: 20,2123 BANK 20
059052,000022: 20,2000 SETLOC DAPS3
059053,000023: 20,2000 BANK
059054,000024:
059055,000025: 20,2123 E6,1635 EBANK= CDUXD
059056,000026: 20,2123 COUNT* $$/DAPIF
059057,000027:
059058,000028: # MOD 0 DATE 11/15/66 BY GEORGE W. CHERRY
059059,000029: # MOD 1 1/23/67 MODIFICATION BY PETER ADLER
059060,000030:
059061,000031: # FUNCTIONAL DESCRIPTION
059062,000032: # HEREIN ARE A COLLECTION OF SUBROUTINES WHICH ALLOW MISSION CONTROL PROGRAMS TO CONTROL THE MODE
059063,000033: # AND INTERFACE WITH THE DAP.
059064,000034:
059065,000035: # CALLING SEQUENCES
059066,000036: # IN INTERRUPT OR WITH INTERRUPT INHIBITED
059067,000037: # TC IBNKCALL
059068,000038: # FCADR ROUTINE
059069,000039: # IN A JOB WITHOUT INTERRUPT INHIBITED
059070,000040: # INHINT
059071,000041: # TC IBNKCALL
059072,000042: # FCADR ROUTINE
059073,000043: # RELINT
059074,000044:
059075,000045: # OUTPUT
059076,000046: # SEE INDIVIDUAL ROUTINES BELOW
059077,000047:
059078,000048: # DEBRIS
059079,000049: # A, L, AND SOMETIMES MDUETEMP ODE NOT IN PULSES MODE
059080,000050:
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Page 1407
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059082,000052: # SUBROUTINE NAMES:
059083,000053: # SETMAXDB, SETMINDB, RESTORDB, PFLITEDB
059084,000054: # MODIFIED: 30 JANUARY 1968 BY P S WEISSMAN TO CREATE RESTORDB.
059085,000055: # MODIFIED: 1 MARCH 1968 BY P S WEISSMAN TO SAVE EBANK AND CREATE PFLITEDB
059086,000056:
059087,000057: # FUNCTIONAL DESCRIPTION:
059088,000058: # SETMAXDB - SET DEADBAND TO 5.0 DEGREES
059089,000059: # SETMINDB - SET DEADBAND TO 0.3 DEGREE
059090,000060: # RESTORDB - SET DEADBAND TO MAX OR MIN ACCORDING TO SETTING OF DBSELECT BIT OF DAPBOOLS
059091,000061: # PFLITEDB - SET DEADBAND TO 1.0 DEGREE AND ZERO THE COMMANDED ATTITUDE CHANGE AND COMMANDED RATE
059092,000062:
059093,000063: # ALL ENTRIES SET UP A NOVAC JOB TO DO 1/ACCS SO THAT THE TJETLAW SWITCH CURVES ARE POSITIONED TO
059094,000064: # REFLECT THE NEW DEADBAND. IT SHOULD BE NOTED THAT THE DEADBAND REFERS TO THE ATTITUDE IN THE P-, U-, AND V-AXES.
059095,000065:
059096,000066: # SUBROUTINE CALLED: NOVAC
059097,000067:
059098,000068: # CALLING SEQUENCE: SAME AS ABOVE
059099,000069: # OR TC RESTORDB +1 FROM ALLCOAST
059100,000070:
059101,000071: # DEBRIS: A, L, Q, RUPTREG1, (ITEMPS IN NOVAC)
059102,000072:
059103,000073: 20,2123 30111 RESTORDB CAE DAPBOOLS # DETERMINE CREW-SELECTED DEADBAND.
059104,000074: 20,2124 74750 MASK DBSELECT
059105,000075: 20,2125 00006 EXTEND
059106,000076: 20,2126 12140 BZF SETMINDB
059107,000077:
059108,000078: 20,2127 32151 SETMAXDB CAF WIDEDB # SET 5 DEGREE DEADBAND.
059109,000079: 20,2130 55346 +1 TS DB
059110,000080:
059111,000081: 20,2131 00006 EXTEND # SET UP JOB TO RE-POSITION SWITCH CURVES.
059112,000082: 20,2132 22070 QXCH RUPTREG1
059113,000083: 20,2133 37715 CALLACCS CAF PRIO27
059114,000084: 20,2134 05072 TC NOVAC
059115,000085: 20,2135 E6,1537 EBANK= AOSQ
059116,000086: 20,2135 02454 40106 2CADR 1/ACCJOB
059117,000087:
059118,000088: 20,2137 00070 TC RUPTREG1 # RETURN TO CALLER.
059119,000089:
059120,000090: 20,2140 32150 SETMINDB CAF NARROWDB # SET 0.3 DEGREE DEADBAND.
059121,000091: 20,2141 12130 TCF SETMAXDB +1
059122,000092:
059123,000093: 20,2142 00006 PFLITEDB EXTEND # THE RETURN FROM CALLACCS IS TO RUPTREG1.
059124,000094: 20,2143 22070 QXCH RUPTREG1
059125,000095: 20,2144 02153 TC ZATTEROR # ZERO THE ERRORS AND COMMANDED RATES.
059126,000096: 20,2145 32152 CAF POWERDB # SET DB TO 1.0 DEG.
059127,000097: 20,2146 55346 TS DB
059128,000098: 20,2147 12133 TCF CALLACCS # SET UP 1/ACCS AND RETURN TO CALLER.
059129,000099: 20,2150 00155 NARROWDB OCTAL 00155 # 0.3 DEGREE SCALED AT 45.
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Page 1408
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059131,000101: 20,2151 03434 WIDEDB OCTAL 03434 # 5.0 DEGREES SCALED AT 45.
059132,000102: 20,2152 00554 POWERDB DEC .02222 # 1.0 DEGREE SCALED AT 45.
059133,000103:
059134,000104: 20,2153 35015 ZATTEROR CAF EBANK6
059135,000105: 20,2154 56003 XCH EBANK
059136,000106: 20,2155 54001 TS L # SAVE CALLERS EBANK IN L.
059137,000107: 20,2156 30032 CAE CDUX
059138,000108: 20,2157 55635 TS CDUXD
059139,000109: 20,2160 30033 CAE CDUY
059140,000110: 20,2161 55636 TS CDUYD
059141,000111: 20,2162 30034 CAE CDUZ
059142,000112: 20,2163 55637 TS CDUZD
059143,000113: 20,2164 12170 TCF STOPRATE +3
059144,000114:
059145,000115: 20,2165 35015 STOPRATE CAF EBANK6
059146,000116: 20,2166 56003 XCH EBANK
059147,000117: 20,2167 54001 TS L # SAVE CALLERS EBANK IN L.
059148,000118: 20,2170 34755 +3 CAF ZERO
059149,000119: 20,2171 55643 TS OMEGAPD
059150,000120: 20,2172 55644 TS OMEGAQD
059151,000121: 20,2173 55645 TS OMEGARD
059152,000122: 20,2174 55640 TS DELCDUX
059153,000123: 20,2175 55641 TS DELCDUY
059154,000124: 20,2176 55642 TS DELCDUZ
059155,000125: 20,2177 55277 TS DELPEROR
059156,000126: 20,2200 55300 TS DELQEROR
059157,000127: 20,2201 55301 TS DELREROR
059158,000128: 20,2202 22003 LXCH EBANK # RESTORE CALLERS EBANK.
059159,000129: 20,2203 00002 TC Q
059160,000130:
059161,000131: # SUBROUTINE NAME: ALLCOAST
059162,000132: # WILL BE CALLED BY FRESH STARTS AND ENGINE OFF ROUTINES. .
059163,000133:
059164,000134: # CALLING SEQUENCE: (SAME AS ABOVE)
059165,000135:
059166,000136: # EXIT: RETURN TO Q.
059167,000137:
059168,000138: # SUBROUTINES CALLED: STOPRATE, RESTORDB, NOVAC
059169,000139:
059170,000140: # ZERO: (FOR ALL AXES) AOS, ALPHA, AOSTERM, OMEGAD, DELCDU, DELEROR
059171,000141:
059172,000142: # OUTPUT: DRIFTBIT/DAPBOOLS, DB, JOB TO DO 1/ACCS
059173,000143:
059174,000144: # DEBRIS: A, L, Q, RUPTREG1, RUPTREG2, (ITEMPS IN NOVAC)
059175,000145:
059176,000146: 20,2204 00006 ALLCOAST EXTEND # SAVE Q FOR RETURN
059177,000147: 20,2205 22071 QXCH RUPTREG2
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Page 1409
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059179,000149: 20,2206 02165 TC STOPRATE # CLEAR RATE INTERFACE. RETURN WITH A=0
059180,000150: 20,2207 22003 LXCH EBANK # AND L=EBANK6. SAVE CALLERS EBANK.
059181,000151: 20,2210 55537 TS AOSQ
059182,000152: 20,2211 55540 TS AOSQ +1
059183,000153: 20,2212 55541 TS AOSR
059184,000154: 20,2213 55542 TS AOSR +1
059185,000155: 20,2214 55424 TS ALPHAQ # FOR DOWNLIST.
059186,000156: 20,2215 55425 TS ALPHAR
059187,000157: 20,2216 55545 TS AOSQTERM
059188,000158: 20,2217 55546 TS AOSRTERM
059189,000159: 20,2220 22003 LXCH EBANK # RESTORE EBANK (EBANK6 NO LONGER NEEDED)
059190,000160:
059191,000161: 20,2221 40111 CS DAPBOOLS # SET UP DRIFTBIT
059192,000162: 20,2222 74744 MASK DRIFTBIT
059193,000163: 20,2223 26111 ADS DAPBOOLS
059194,000164: 20,2224 02124 TC RESTORDB +1 # RESTORE DEADBANK TO CREW-SELECTED VALUE.
059195,000165:
059196,000166: 20,2225 00071 TC RUPTREG2 # RETURN.
059197,000167:
End of include-file DAP_INTERFACE_SUBROUTINES.agc. Parent file is MAIN.agc