Source Code
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These source-code files are part of a reconstructed copy of Luminary 173, the
second (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 178. Changes
between revision 173 and 178 were backed out, as described by Luminary memo 167
(revision 1). The reconstruction was verified by matching memory-bank checksums
to those listed in drawing 2021152N. Note that page numbers in the reconstructed
code match those for the baseline log section mentioned in each file's changelog;
the page numbers for a real Luminary 173 listing would be different.
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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059543,000002: ## Copyright: Public domain.
059544,000003: ## Filename: T6-RUPT_PROGRAMS.agc
059545,000004: ## Purpose: A section of Luminary revision 173.
059546,000005: ## It is part of the reconstructed source code for the second
059547,000006: ## (unflown) release of the flight software for the Lunar
059548,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
059549,000008: ## The code has been recreated from a reconstructed copy of
059550,000009: ## Luminary 178, as well as Luminary memo 167 (revision 1).
059551,000010: ## It has been adapted such that the resulting bugger words
059552,000011: ## exactly match those specified for Luminary 173 in NASA
059553,000012: ## drawing 2021152N, which gives relatively high confidence
059554,000013: ## that the reconstruction is correct.
059555,000014: ## Reference: pp. 1391-1393
059556,000015: ## Assembler: yaYUL
059557,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059558,000017: ## Website: www.ibiblio.org/apollo/index.html
059559,000018: ## Mod history: 2019-09-18 MAS Created from Luminary 178.
059560,000019:
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Page 1391
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059562,000021: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
059563,000022: # (2) DOT6RUPT
059564,000023:
059565,000024: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
059566,000025: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
059567,000026: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
059568,000027: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
059569,000028: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
059570,000029: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
059571,000030: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
059572,000031: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
059573,000032: # B. THE TIME6 CLOCK IS ENABLED.
059574,000033: # C. TIME6 IS INTERROGATED AND IS:
059575,000034: # I. NEVER FOUND NEGATIVE(NON-ZERO) OR +0.
059576,000035: # II. SOMETIMES FOUND POSITIVE(BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
059577,000036: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
059578,000037: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
059579,000038: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
059580,000039: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
059581,000040: # C. A T6RUPT IS IN PROCESS NOW.
059582,000041: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
059583,000042: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
059584,000043:
059585,000044: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
059586,000045: # T6JOBCHK CALLING SEQUENCE:
059587,000046:
059588,000047: # L TC T6JOBCHK
059589,000048: # L +1 (RETURN)
059590,000049:
059591,000050: # DOT6RUPT CALLING SEQUENCE:
059592,000051:
059593,000052: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
059594,000053: # EXTEND
059595,000054: # DCA T6ADR
059596,000055: # DTCB
059597,000056:
059598,000057: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
059599,000058:
059600,000059: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
059601,000060: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
059602,000061:
059603,000062: # ALARM/ABORT MODES: NONE.
059604,000063:
059605,000064: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
059606,000065: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
059607,000066: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
059608,000067: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
059609,000068:
059610,000069:
059611,000070: 5754 BLOCK 02
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Page 1392
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059613,000072: 17,2055 BANK 17
059614,000073: 17,2000 SETLOC DAPS2
059615,000074: 17,2000 BANK
059616,000075: 17,2055 E6,1466 EBANK= T6NEXT
059617,000076: 17,2055 COUNT* $$/DAPT6
059618,000077:
059619,000078: 17,2055 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
059620,000079: 17,2056 00002 TC Q # NONE: CLOCK COUTING DOWN.
059621,000080: 17,2057 05706 TC CCSHOLE
059622,000081: 17,2060 05706 TC CCSHOLE
059623,000082: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
059624,000083:
059625,000084: 17,2061 34733 T6JOB CA POSMAX
059626,000085: 17,2062 22007 ZL
059627,000086: 17,2063 53471 DXCH T6FURTHA
059628,000087: 17,2064 53467 DXCH T6NEXT
059629,000088: 17,2065 23465 LXCH NXT6ADR
059630,000089: 17,2066 54031 TS TIME6
059631,000090:
059632,000091: 17,2067 67730 AD PRIO37
059633,000092: 17,2070 54000 TS A
059634,000093: 17,2071 12075 TCF ENABLET6
059635,000094: 17,2072 34733 CA POSMAX
059636,000095: 17,2073 54031 TS TIME6
059637,000096: 17,2074 12115 TCF GOCH56
059638,000097: 17,2075 00006 ENABLET6 EXTEND
059639,000098: 17,2076 23265 QXCH C13QSAV
059640,000099: 17,2077 22070 LXCH RUPTREG1
059641,000100: 17,2100 06022 TC C13STALL
059642,000101: 17,2101 00006 EXTEND
059643,000102: 17,2102 23265 QXCH C13QSAV
059644,000103: 17,2103 22070 LXCH RUPTREG1
059645,000104: 17,2104 34735 CAF BIT15
059646,000105: 17,2105 00006 EXTEND
059647,000106: 17,2106 05013 WOR CHAN13
059648,000107: 17,2107 31466 CA T6NEXT
059649,000108: 17,2110 67730 AD PRIO37
059650,000109: 17,2111 54000 TS A
059651,000110: 17,2112 12115 TCF GOCH56
059652,000111: 17,2113 34733 CA POSMAX
059653,000112: 17,2114 55466 TS T6NEXT
059654,000113: 17,2115 50001 GOCH56 INDEX L
059655,000114: 17,2116 15754 TCF WRITEP -1
059656,000115:
059657,000116: 5754 BLOCK 02
059658,000117: 4000 SETLOC FFTAG9
059659,000118: 4000 BANK
059660,000119: 5754 E6,1634 EBANK= CDUXD
059661,000120: 5754 COUNT* $$/DAPT6
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Page 1393
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059663,000122: 5754 31472 CA NEXTP
059664,000123: 5755 00006 WRITEP EXTEND
059665,000124: 5756 01006 WRITE CHAN6
059666,000125: 5757 00002 TC Q
059667,000126:
059668,000127: 5760 31473 CA NEXTU
059669,000128: 5761 54001 WRITEU TS L
059670,000129: 5762 45775 CS 00314OCT
059671,000130: 5763 00006 EXTEND
059672,000131: 5764 02005 RAND CHAN5
059673,000132: 5765 60001 AD L
059674,000133: 5766 00006 EXTEND
059675,000134: 5767 01005 WRITE CHAN5
059676,000135: 5770 00002 TC Q
059677,000136:
059678,000137: 5771 31474 CA NEXTV
059679,000138: 5772 54001 WRITEV TS L
059680,000139: 5773 35775 CA 00314OCT
059681,000140: 5774 15763 TCF -9D
059682,000141: 5775 00314 00314OCT OCT 00314
059683,000142:
059684,000143: 17,2117 BANK 17
059685,000144: 17,2000 SETLOC DAPS2
059686,000145: 17,2000 BANK
059687,000146:
059688,000147: 17,2117 E6,1466 EBANK= T6NEXT
059689,000148: 17,2117 COUNT* $$/DAPT6
059690,000149:
059691,000150: 17,2117 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059692,000151: 17,2120 00006 EXTEND
059693,000152: 17,2121 22012 QXCH QRUPT
059694,000153:
059695,000154: 17,2122 02055 TC T6JOBCHK # CALL T6JOBCHK.
059696,000155:
059697,000156: 17,2123 15301 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc