Source Code
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These source-code files are part of a reconstructed copy of Luminary 163, the
first (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 173. Changes
between revision 163 and 173 were backed out, as described by Luminary memos 157
and 158. 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 163 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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059475,000002: ## Copyright: Public domain.
059476,000003: ## Filename: T6-RUPT_PROGRAMS.agc
059477,000004: ## Purpose: A section of Luminary revision 163.
059478,000005: ## It is part of the reconstructed source code for the first
059479,000006: ## (unflown) release of the flight software for the Lunar
059480,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
059481,000008: ## The code has been recreated from a reconstructed copy of
059482,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
059483,000010: ## It has been adapted such that the resulting bugger words
059484,000011: ## exactly match those specified for Luminary 163 in NASA
059485,000012: ## drawing 2021152N, which gives relatively high confidence
059486,000013: ## that the reconstruction is correct.
059487,000014: ## Reference: pp. 1391-1393
059488,000015: ## Assembler: yaYUL
059489,000016: ## Contact: Ron Burkey <info@sandroid.org>.
059490,000017: ## Website: www.ibiblio.org/apollo/index.html
059491,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
059492,000019:
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Page 1391
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059494,000021: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
059495,000022: # (2) DOT6RUPT
059496,000023:
059497,000024: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
059498,000025: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
059499,000026: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
059500,000027: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
059501,000028: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
059502,000029: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
059503,000030: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
059504,000031: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
059505,000032: # B. THE TIME6 CLOCK IS ENABLED.
059506,000033: # C. TIME6 IS INTERROGATED AND IS:
059507,000034: # I. NEVER FOUND NEGATIVE(NON-ZERO) OR +0.
059508,000035: # II. SOMETIMES FOUND POSITIVE(BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
059509,000036: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
059510,000037: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
059511,000038: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
059512,000039: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
059513,000040: # C. A T6RUPT IS IN PROCESS NOW.
059514,000041: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
059515,000042: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
059516,000043:
059517,000044: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
059518,000045: # T6JOBCHK CALLING SEQUENCE:
059519,000046:
059520,000047: # L TC T6JOBCHK
059521,000048: # L +1 (RETURN)
059522,000049:
059523,000050: # DOT6RUPT CALLING SEQUENCE:
059524,000051:
059525,000052: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
059526,000053: # EXTEND
059527,000054: # DCA T6ADR
059528,000055: # DTCB
059529,000056:
059530,000057: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
059531,000058:
059532,000059: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
059533,000060: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
059534,000061:
059535,000062: # ALARM/ABORT MODES: NONE.
059536,000063:
059537,000064: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
059538,000065: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
059539,000066: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
059540,000067: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
059541,000068:
059542,000069:
059543,000070: 5754 BLOCK 02
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Page 1392
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059545,000072: 17,2055 BANK 17
059546,000073: 17,2000 SETLOC DAPS2
059547,000074: 17,2000 BANK
059548,000075: 17,2055 E6,1466 EBANK= T6NEXT
059549,000076: 17,2055 COUNT* $$/DAPT6
059550,000077:
059551,000078: 17,2055 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
059552,000079: 17,2056 00002 TC Q # NONE: CLOCK COUTING DOWN.
059553,000080: 17,2057 05706 TC CCSHOLE
059554,000081: 17,2060 05706 TC CCSHOLE
059555,000082: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
059556,000083:
059557,000084: 17,2061 34733 T6JOB CA POSMAX
059558,000085: 17,2062 22007 ZL
059559,000086: 17,2063 53471 DXCH T6FURTHA
059560,000087: 17,2064 53467 DXCH T6NEXT
059561,000088: 17,2065 23465 LXCH NXT6ADR
059562,000089: 17,2066 54031 TS TIME6
059563,000090:
059564,000091: 17,2067 67730 AD PRIO37
059565,000092: 17,2070 54000 TS A
059566,000093: 17,2071 12075 TCF ENABLET6
059567,000094: 17,2072 34733 CA POSMAX
059568,000095: 17,2073 54031 TS TIME6
059569,000096: 17,2074 12115 TCF GOCH56
059570,000097: 17,2075 00006 ENABLET6 EXTEND
059571,000098: 17,2076 23265 QXCH C13QSAV
059572,000099: 17,2077 22070 LXCH RUPTREG1
059573,000100: 17,2100 06022 TC C13STALL
059574,000101: 17,2101 00006 EXTEND
059575,000102: 17,2102 23265 QXCH C13QSAV
059576,000103: 17,2103 22070 LXCH RUPTREG1
059577,000104: 17,2104 34735 CAF BIT15
059578,000105: 17,2105 00006 EXTEND
059579,000106: 17,2106 05013 WOR CHAN13
059580,000107: 17,2107 31466 CA T6NEXT
059581,000108: 17,2110 67730 AD PRIO37
059582,000109: 17,2111 54000 TS A
059583,000110: 17,2112 12115 TCF GOCH56
059584,000111: 17,2113 34733 CA POSMAX
059585,000112: 17,2114 55466 TS T6NEXT
059586,000113: 17,2115 50001 GOCH56 INDEX L
059587,000114: 17,2116 15754 TCF WRITEP -1
059588,000115:
059589,000116: 5754 BLOCK 02
059590,000117: 4000 SETLOC FFTAG9
059591,000118: 4000 BANK
059592,000119: 5754 E6,1634 EBANK= CDUXD
059593,000120: 5754 COUNT* $$/DAPT6
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Page 1393
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059595,000122: 5754 31472 CA NEXTP
059596,000123: 5755 00006 WRITEP EXTEND
059597,000124: 5756 01006 WRITE CHAN6
059598,000125: 5757 00002 TC Q
059599,000126:
059600,000127: 5760 31473 CA NEXTU
059601,000128: 5761 54001 WRITEU TS L
059602,000129: 5762 45775 CS 00314OCT
059603,000130: 5763 00006 EXTEND
059604,000131: 5764 02005 RAND CHAN5
059605,000132: 5765 60001 AD L
059606,000133: 5766 00006 EXTEND
059607,000134: 5767 01005 WRITE CHAN5
059608,000135: 5770 00002 TC Q
059609,000136:
059610,000137: 5771 31474 CA NEXTV
059611,000138: 5772 54001 WRITEV TS L
059612,000139: 5773 35775 CA 00314OCT
059613,000140: 5774 15763 TCF -9D
059614,000141: 5775 00314 00314OCT OCT 00314
059615,000142:
059616,000143: 17,2117 BANK 17
059617,000144: 17,2000 SETLOC DAPS2
059618,000145: 17,2000 BANK
059619,000146:
059620,000147: 17,2117 E6,1466 EBANK= T6NEXT
059621,000148: 17,2117 COUNT* $$/DAPT6
059622,000149:
059623,000150: 17,2117 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059624,000151: 17,2120 00006 EXTEND
059625,000152: 17,2121 22012 QXCH QRUPT
059626,000153:
059627,000154: 17,2122 02055 TC T6JOBCHK # CALL T6JOBCHK.
059628,000155:
059629,000156: 17,2123 15301 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc