Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
original release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Luminary 99 revision 1 previously
transcribed from a digitized copy of that program. The code was then updated
by undoing changes described in original Luminary memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. 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 97 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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059029,000002: ## Copyright: Public domain.
059030,000003: ## Filename: T6-RUPT_PROGRAMS.agc
059031,000004: ## Purpose: A section of Luminary revision 97.
059032,000005: ## It is part of the reconstructed source code for the
059033,000006: ## original release of the flight software for the Lunar
059034,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
059035,000008: ## The code has been recreated from a copy of Luminary 99
059036,000009: ## revision 001, using asterisks indicating changed lines in
059037,000010: ## the listing and Luminary Memos #83 and #85, which list
059038,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
059039,000012: ## code has been adapted such that the resulting bugger words
059040,000013: ## exactly match those specified for Luminary 97 in NASA drawing
059041,000014: ## 2021152D, which gives relatively high confidence that the
059042,000015: ## reconstruction is correct.
059043,000016: ## Reference: pp. 1403-1405
059044,000017: ## Assembler: yaYUL
059045,000018: ## Contact: Ron Burkey <info@sandroid.org>.
059046,000019: ## Website: www.ibiblio.org/apollo/index.html
059047,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
059048,000021:
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Page 1403
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059050,000023: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
059051,000024: # (2) DOT6RUPT
059052,000025: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
059053,000026:
059054,000027: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
059055,000028: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
059056,000029: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
059057,000030: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
059058,000031: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
059059,000032: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
059060,000033: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
059061,000034: # B. THE TIME6 CLOCK IS ENABLED.
059062,000035: # C. TIME6 IS INTERROGATED AND IS:
059063,000036: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
059064,000037: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
059065,000038: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
059066,000039: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
059067,000040: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
059068,000041: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
059069,000042: # C. A T6RUPT IS IN PROCESS NOW.
059070,000043: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
059071,000044: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
059072,000045: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
059073,000046:
059074,000047: # T6JOBCHK CALLING SEQUENCE:
059075,000048: # L TC T6JOBCHK
059076,000049: # L+1 (RETURN)
059077,000050:
059078,000051: # DOT6RUPT CALLING SEQUENCE:
059079,000052: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
059080,000053: # EXTEND
059081,000054: # DCA T6ADR
059082,000055: # DTCB
059083,000056:
059084,000057: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
059085,000058:
059086,000059: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
059087,000060: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
059088,000061:
059089,000062: # ALARM/ABORT MODES: NONE.
059090,000063:
059091,000064: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
059092,000065: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
059093,000066: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
059094,000067:
059095,000068: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
059096,000069:
059097,000070: 5753 BLOCK 02
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Page 1404
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059099,000072: 17,2027 BANK 17
059100,000073: 17,2000 SETLOC DAPS2
059101,000074: 17,2000 BANK
059102,000075: 17,2027 E6,1466 EBANK= T6NEXT
059103,000076: 17,2027 COUNT* $$/DAPT6
059104,000077:
059105,000078: 17,2027 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
059106,000079: 17,2030 00002 TC Q # NONE: CLOCK COUTING DOWN.
059107,000080: 17,2031 05705 TC CCSHOLE
059108,000081: 17,2032 02032 TC T6JOBCHK +3
059109,000082:
059110,000083: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
059111,000084:
059112,000085: 17,2033 34733 T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
059113,000086: 17,2034 00006 EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
059114,000087: 17,2035 03013 WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
059115,000088:
059116,000089: 17,2036 34733 CA POSMAX
059117,000090: 17,2037 22007 ZL
059118,000091: 17,2040 53471 DXCH T6FURTHA
059119,000092: 17,2041 53467 DXCH T6NEXT
059120,000093: 17,2042 23465 LXCH NXT6ADR
059121,000094: 17,2043 54031 TS TIME6
059122,000095:
059123,000096: 17,2044 67725 AD PRIO37
059124,000097: 17,2045 54000 TS A
059125,000098: 17,2046 12052 TCF ENABLET6
059126,000099: 17,2047 34733 CA POSMAX
059127,000100: 17,2050 54031 TS TIME6
059128,000101: 17,2051 12063 TCF GOCH56
059129,000102: 17,2052 34735 ENABLET6 CA BIT15
059130,000103: 17,2053 00006 EXTEND
059131,000104: 17,2054 05013 WOR CHAN13
059132,000105: 17,2055 31466 CA T6NEXT
059133,000106: 17,2056 67725 AD PRIO37
059134,000107: 17,2057 54000 TS A
059135,000108: 17,2060 12063 TCF GOCH56
059136,000109: 17,2061 34733 CA POSMAX
059137,000110: 17,2062 55466 TS T6NEXT
059138,000111: 17,2063 50001 GOCH56 INDEX L
059139,000112: 17,2064 15753 TCF WRITEP -1
059140,000113:
059141,000114: 5753 BLOCK 02
059142,000115: 4000 SETLOC FFTAG9
059143,000116: 4000 BANK
059144,000117: 5753 E6,1635 EBANK= CDUXD
059145,000118: 5753 COUNT* $$/DAPT6
059146,000119:
059147,000120: 5753 31472 CA NEXTP
059148,000121: 5754 00006 WRITEP EXTEND
059149,000122: 5755 01006 WRITE CHAN6
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Page 1405
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059151,000124: 5756 00002 TC Q
059152,000125:
059153,000126: 5757 31473 CA NEXTU
059154,000127: 5760 54001 WRITEU TS L
059155,000128: 5761 45774 CS 00314OCT
059156,000129: 5762 00006 EXTEND
059157,000130: 5763 02005 RAND CHAN5
059158,000131: 5764 60001 AD L
059159,000132: 5765 00006 EXTEND
059160,000133: 5766 01005 WRITE CHAN5
059161,000134: 5767 00002 TC Q
059162,000135:
059163,000136: 5770 31474 CA NEXTV
059164,000137: 5771 54001 WRITEV TS L
059165,000138: 5772 35774 CA 00314OCT
059166,000139: 5773 15762 TCF -9D
059167,000140: 5774 00314 00314OCT OCT 00314
059168,000141:
059169,000142: 17,2065 BANK 17
059170,000143: 17,2000 SETLOC DAPS2
059171,000144: 17,2000 BANK
059172,000145:
059173,000146: 17,2065 E6,1466 EBANK= T6NEXT
059174,000147: 17,2065 COUNT* $$/DAPT6
059175,000148:
059176,000149: 17,2065 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059177,000150: 17,2066 00006 EXTEND
059178,000151: 17,2067 22012 QXCH QRUPT
059179,000152:
059180,000153: 17,2070 02027 TC T6JOBCHK # CALL T6JOBCHK.
059181,000154:
059182,000155: 17,2071 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
059183,000156:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc