Source Code
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These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 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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058685,000002: ## Copyright: Public domain.
058686,000003: ## Filename: T6-RUPT_PROGRAMS.agc
058687,000004: ## Purpose: A section of LM131 revision 1.
058688,000005: ## It is part of the reconstructed source code for the final
058689,000006: ## release of the flight software for the Lunar Module's (LM)
058690,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
058691,000008: ## been reconstructed from a listing of Luminary 131 and a dump
058692,000009: ## of a core rope memory module B5, part number 2010802-171,
058693,000010: ## which is the only module different between LM131 revision 1
058694,000011: ## and Luminary 131. The executable generated from this source
058695,000012: ## has been verified against the module dump, so while the names,
058696,000013: ## comments, and ordering may not be exactly correct, the
058697,000014: ## resulting binary is.
058698,000015: ## Reference: pp. 1395-1397
058699,000016: ## Assembler: yaYUL
058700,000017: ## Contact: Ron Burkey <info@sandroid.org>.
058701,000018: ## Website: www.ibiblio.org/apollo/index.html
058702,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
058703,000020:
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Page 1395
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058705,000022: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
058706,000023: # (2) DOT6RUPT
058707,000024: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
058708,000025:
058709,000026: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
058710,000027: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
058711,000028: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
058712,000029: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
058713,000030: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
058714,000031: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
058715,000032: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
058716,000033: # B. THE TIME6 CLOCK IS ENABLED.
058717,000034: # C. TIME6 IS INTERROGATED AND IS:
058718,000035: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
058719,000036: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
058720,000037: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
058721,000038: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
058722,000039: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
058723,000040: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
058724,000041: # C. A T6RUPT IS IN PROCESS NOW.
058725,000042: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
058726,000043: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
058727,000044: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
058728,000045:
058729,000046: # T6JOBCHK CALLING SEQUENCE:
058730,000047: # L TC T6JOBCHK
058731,000048: # L+1 (RETURN)
058732,000049:
058733,000050: # DOT6RUPT CALLING SEQUENCE:
058734,000051: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
058735,000052: # EXTEND
058736,000053: # DCA T6ADR
058737,000054: # DTCB
058738,000055:
058739,000056: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
058740,000057:
058741,000058: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
058742,000059: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
058743,000060:
058744,000061: # ALARM/ABORT MODES: NONE.
058745,000062:
058746,000063: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
058747,000064: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
058748,000065: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
058749,000066:
058750,000067: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
058751,000068:
058752,000069: 5743 BLOCK 02
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Page 1396
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058754,000071: 17,2055 BANK 17
058755,000072: 17,2000 SETLOC DAPS2
058756,000073: 17,2000 BANK
058757,000074: 17,2055 E6,1466 EBANK= T6NEXT
058758,000075: 17,2055 COUNT* $$/DAPT6
058759,000076:
058760,000077: 17,2055 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
058761,000078: 17,2056 00002 TC Q # NONE: CLOCK COUTING DOWN.
058762,000079: 17,2057 05675 TC CCSHOLE
058763,000080: 17,2060 05675 TC CCSHOLE
058764,000081:
058765,000082: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
058766,000083:
058767,000084: 17,2061 34733 T6JOB CA POSMAX
058768,000085: 17,2062 22007 ZL
058769,000086: 17,2063 53471 DXCH T6FURTHA
058770,000087: 17,2064 53467 DXCH T6NEXT
058771,000088: 17,2065 23465 LXCH NXT6ADR
058772,000089: 17,2066 54031 TS TIME6
058773,000090:
058774,000091: 17,2067 67730 AD PRIO37
058775,000092: 17,2070 54000 TS A
058776,000093: 17,2071 12075 TCF ENABLET6
058777,000094: 17,2072 34733 CA POSMAX
058778,000095: 17,2073 54031 TS TIME6
058779,000096: 17,2074 12115 TCF GOCH56
058780,000097: 17,2075 00006 ENABLET6 EXTEND
058781,000098: 17,2076 23265 QXCH C13QSAV
058782,000099: 17,2077 22070 LXCH RUPTREG1
058783,000100: 17,2100 06022 TC C13STALL
058784,000101: 17,2101 00006 EXTEND
058785,000102: 17,2102 23265 QXCH C13QSAV
058786,000103: 17,2103 22070 LXCH RUPTREG1
058787,000104: 17,2104 34735 CAF BIT15
058788,000105: 17,2105 00006 EXTEND
058789,000106: 17,2106 05013 WOR CHAN13
058790,000107: 17,2107 31466 CA T6NEXT
058791,000108: 17,2110 67730 AD PRIO37
058792,000109: 17,2111 54000 TS A
058793,000110: 17,2112 12115 TCF GOCH56
058794,000111: 17,2113 34733 CA POSMAX
058795,000112: 17,2114 55466 TS T6NEXT
058796,000113: 17,2115 50001 GOCH56 INDEX L
058797,000114: 17,2116 15743 TCF WRITEP -1
058798,000115:
058799,000116: 5743 BLOCK 02
058800,000117: 4000 SETLOC FFTAG9
058801,000118: 4000 BANK
058802,000119: 5743 E6,1634 EBANK= CDUXD
058803,000120: 5743 COUNT* $$/DAPT6
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Page 1397
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058805,000122: 5743 31472 CA NEXTP
058806,000123: 5744 00006 WRITEP EXTEND
058807,000124: 5745 01006 WRITE CHAN6
058808,000125: 5746 00002 TC Q
058809,000126:
058810,000127: 5747 31473 CA NEXTU
058811,000128: 5750 54001 WRITEU TS L
058812,000129: 5751 45764 CS 00314OCT
058813,000130: 5752 00006 EXTEND
058814,000131: 5753 02005 RAND CHAN5
058815,000132: 5754 60001 AD L
058816,000133: 5755 00006 EXTEND
058817,000134: 5756 01005 WRITE CHAN5
058818,000135: 5757 00002 TC Q
058819,000136:
058820,000137: 5760 31474 CA NEXTV
058821,000138: 5761 54001 WRITEV TS L
058822,000139: 5762 35764 CA 00314OCT
058823,000140: 5763 15752 TCF -9D
058824,000141: 5764 00314 00314OCT OCT 00314
058825,000142:
058826,000143: 17,2117 BANK 17
058827,000144: 17,2000 SETLOC DAPS2
058828,000145: 17,2000 BANK
058829,000146:
058830,000147: 17,2117 E6,1466 EBANK= T6NEXT
058831,000148: 17,2117 COUNT* $$/DAPT6
058832,000149:
058833,000150: 17,2117 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
058834,000151: 17,2120 00006 EXTEND
058835,000152: 17,2121 22012 QXCH QRUPT
058836,000153:
058837,000154: 17,2122 02055 TC T6JOBCHK # CALL T6JOBCHK.
058838,000155:
058839,000156: 17,2123 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
058840,000157:
058841,000158:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc