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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058877,000002: ## Copyright: Public domain.
058878,000003: ## Filename: T6-RUPT_PROGRAMS.agc
058879,000004: ## Purpose: A section of Luminary revision 96.
058880,000005: ## It is part of the reconstructed source code for the
058881,000006: ## original release 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 previously reconstructed
058884,000009: ## copy of Luminary 97 by undoing changes described in anomaly
058885,000010: ## report LNY-59. The code has been adapted such that the
058886,000011: ## resulting bugger words exactly match those specified for
058887,000012: ## Luminary 96 in NASA drawing 2021152D, which gives relatively
058888,000013: ## high confidence that the reconstruction is correct.
058889,000014: ## Reference: pp. 1403-1405
058890,000015: ## Assembler: yaYUL
058891,000016: ## Contact: Ron Burkey <info@sandroid.org>.
058892,000017: ## Website: www.ibiblio.org/apollo/index.html
058893,000018: ## Mod history: 2019-08-04 MAS Created from Luminary 97.
058894,000019:
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Page 1403
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058896,000021: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
058897,000022: # (2) DOT6RUPT
058898,000023: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
058899,000024:
058900,000025: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
058901,000026: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
058902,000027: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
058903,000028: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
058904,000029: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
058905,000030: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
058906,000031: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
058907,000032: # B. THE TIME6 CLOCK IS ENABLED.
058908,000033: # C. TIME6 IS INTERROGATED AND IS:
058909,000034: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
058910,000035: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
058911,000036: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
058912,000037: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
058913,000038: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
058914,000039: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
058915,000040: # C. A T6RUPT IS IN PROCESS NOW.
058916,000041: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
058917,000042: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
058918,000043: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
058919,000044:
058920,000045: # T6JOBCHK CALLING SEQUENCE:
058921,000046: # L TC T6JOBCHK
058922,000047: # L+1 (RETURN)
058923,000048:
058924,000049: # DOT6RUPT CALLING SEQUENCE:
058925,000050: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
058926,000051: # EXTEND
058927,000052: # DCA T6ADR
058928,000053: # DTCB
058929,000054:
058930,000055: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
058931,000056:
058932,000057: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
058933,000058: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
058934,000059:
058935,000060: # ALARM/ABORT MODES: NONE.
058936,000061:
058937,000062: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
058938,000063: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
058939,000064: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
058940,000065:
058941,000066: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
058942,000067:
058943,000068: 5753 BLOCK 02
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Page 1404
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058945,000070: 17,2027 BANK 17
058946,000071: 17,2000 SETLOC DAPS2
058947,000072: 17,2000 BANK
058948,000073: 17,2027 E6,1466 EBANK= T6NEXT
058949,000074: 17,2027 COUNT* $$/DAPT6
058950,000075:
058951,000076: 17,2027 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
058952,000077: 17,2030 00002 TC Q # NONE: CLOCK COUTING DOWN.
058953,000078: 17,2031 05705 TC CCSHOLE
058954,000079: 17,2032 02032 TC T6JOBCHK +3
058955,000080:
058956,000081: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
058957,000082:
058958,000083: 17,2033 34733 T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
058959,000084: 17,2034 00006 EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
058960,000085: 17,2035 03013 WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
058961,000086:
058962,000087: 17,2036 34733 CA POSMAX
058963,000088: 17,2037 22007 ZL
058964,000089: 17,2040 53471 DXCH T6FURTHA
058965,000090: 17,2041 53467 DXCH T6NEXT
058966,000091: 17,2042 23465 LXCH NXT6ADR
058967,000092: 17,2043 54031 TS TIME6
058968,000093:
058969,000094: 17,2044 67725 AD PRIO37
058970,000095: 17,2045 54000 TS A
058971,000096: 17,2046 12052 TCF ENABLET6
058972,000097: 17,2047 34733 CA POSMAX
058973,000098: 17,2050 54031 TS TIME6
058974,000099: 17,2051 12063 TCF GOCH56
058975,000100: 17,2052 34735 ENABLET6 CA BIT15
058976,000101: 17,2053 00006 EXTEND
058977,000102: 17,2054 05013 WOR CHAN13
058978,000103: 17,2055 31466 CA T6NEXT
058979,000104: 17,2056 67725 AD PRIO37
058980,000105: 17,2057 54000 TS A
058981,000106: 17,2060 12063 TCF GOCH56
058982,000107: 17,2061 34733 CA POSMAX
058983,000108: 17,2062 55466 TS T6NEXT
058984,000109: 17,2063 50001 GOCH56 INDEX L
058985,000110: 17,2064 15753 TCF WRITEP -1
058986,000111:
058987,000112: 5753 BLOCK 02
058988,000113: 4000 SETLOC FFTAG9
058989,000114: 4000 BANK
058990,000115: 5753 E6,1635 EBANK= CDUXD
058991,000116: 5753 COUNT* $$/DAPT6
058992,000117:
058993,000118: 5753 31472 CA NEXTP
058994,000119: 5754 00006 WRITEP EXTEND
058995,000120: 5755 01006 WRITE CHAN6
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Page 1405
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058997,000122: 5756 00002 TC Q
058998,000123:
058999,000124: 5757 31473 CA NEXTU
059000,000125: 5760 54001 WRITEU TS L
059001,000126: 5761 45774 CS 00314OCT
059002,000127: 5762 00006 EXTEND
059003,000128: 5763 02005 RAND CHAN5
059004,000129: 5764 60001 AD L
059005,000130: 5765 00006 EXTEND
059006,000131: 5766 01005 WRITE CHAN5
059007,000132: 5767 00002 TC Q
059008,000133:
059009,000134: 5770 31474 CA NEXTV
059010,000135: 5771 54001 WRITEV TS L
059011,000136: 5772 35774 CA 00314OCT
059012,000137: 5773 15762 TCF -9D
059013,000138: 5774 00314 00314OCT OCT 00314
059014,000139:
059015,000140: 17,2065 BANK 17
059016,000141: 17,2000 SETLOC DAPS2
059017,000142: 17,2000 BANK
059018,000143:
059019,000144: 17,2065 E6,1466 EBANK= T6NEXT
059020,000145: 17,2065 COUNT* $$/DAPT6
059021,000146:
059022,000147: 17,2065 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059023,000148: 17,2066 00006 EXTEND
059024,000149: 17,2067 22012 QXCH QRUPT
059025,000150:
059026,000151: 17,2070 02027 TC T6JOBCHK # CALL T6JOBCHK.
059027,000152:
059028,000153: 17,2071 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
059029,000154:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc