Source Code
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These source-code files derive from a printout of Luminary 116 (the Apollo 12
Lunar Module guidance computer program), from the personal library of
original AGC developer Don Eyles, digitally photographed at archive.org,
financially sponsored by Ron Burkey, and transcribed to source code by a
team of volunteers. This colorized, syntax-highlighted form was created
by assembling that transcribed source code. Note that the full page images
are available on the
Virtual AGC project page at archive.org, while reduced-size images
are presented at the VirtualAGC project website. Report or fix any
transcription errors at
the Virtual AGC project code repository. Notations on the program listing read, in part: GAP: ASSEMBLE REVISION 116 OF AGC PROGRAM LUMINARY BY NASA 2021112-071 19:09 AUG. 11,1969Note that the date is the date of the printout, not the date of the program revision. |
059189,000002: ## Copyright: Public domain.
059190,000003: ## Filename: T6-RUPT_PROGRAMS.agc
059191,000004: ## Purpose: A section of Luminary revision 116.
059192,000005: ## It is part of the source code for the Lunar Module's (LM)
059193,000006: ## Apollo Guidance Computer (AGC) for Apollo 12.
059194,000007: ## This file is intended to be a faithful transcription, except
059195,000008: ## that the code format has been changed to conform to the
059196,000009: ## requirements of the yaYUL assembler rather than the
059197,000010: ## original YUL assembler.
059198,000011: ## Reference: pp. 1393-1395
059199,000012: ## Assembler: yaYUL
059200,000013: ## Contact: Ron Burkey <info@sandroid.org>.
059201,000014: ## Website: www.ibiblio.org/apollo/index.html
059202,000015: ## Mod history: 2017-01-22 MAS Created from Luminary 99.
059203,000016: ## 2017-02-07 NV Updated for Luminary 116.
059204,000017: ## 2017-03-14 RSB Proofed comment text via 3-way diff vs
059205,000018: ## Luminary 99 and 131 ... no problems found.
059206,000019:
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Page 1393 |
059208,000021: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
059209,000022: # (2) DOT6RUPT
059210,000023: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
059211,000024:
059212,000025: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
059213,000026: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
059214,000027: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
059215,000028: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
059216,000029: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
059217,000030: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
059218,000031: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
059219,000032: # B. THE TIME6 CLOCK IS ENABLED.
059220,000033: # C. TIME6 IS INTERROGATED AND IS:
059221,000034: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
059222,000035: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
059223,000036: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
059224,000037: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
059225,000038: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
059226,000039: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
059227,000040: # C. A T6RUPT IS IN PROCESS NOW.
059228,000041: # 4. ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
059229,000042: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
059230,000043: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
059231,000044:
059232,000045: # T6JOBCHK CALLING SEQUENCE:
059233,000046: # L TC T6JOBCHK
059234,000047: # L+1 (RETURN)
059235,000048:
059236,000049: # DOT6RUPT CALLING SEQUENCE:
059237,000050: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
059238,000051: # EXTEND
059239,000052: # DCA T6ADR
059240,000053: # DTCB
059241,000054:
059242,000055: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
059243,000056:
059244,000057: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
059245,000058: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
059246,000059:
059247,000060: # ALARM/ABORT MODES: NONE.
059248,000061:
059249,000062: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
059250,000063: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
059251,000064: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
059252,000065:
059253,000066: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
059254,000067:
059255,000068: 5743 BLOCK 02
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Page 1394 |
059257,000070: 17,2055 BANK 17
059258,000071: 17,2000 SETLOC DAPS2
059259,000072: 17,2000 BANK
059260,000073: 17,2055 E6,1466 EBANK= T6NEXT
059261,000074: 17,2055 COUNT* $$/DAPT6
059262,000075:
059263,000076: 17,2055 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
059264,000077: 17,2056 00002 TC Q # NONE: CLOCK COUTING DOWN.
059265,000078: 17,2057 05675 TC CCSHOLE
059266,000079: 17,2060 05675 TC CCSHOLE
059267,000080:
059268,000081: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
059269,000082:
059270,000083: 17,2061 34733 T6JOB CA POSMAX
059271,000084: 17,2062 22007 ZL
059272,000085: 17,2063 53471 DXCH T6FURTHA
059273,000086: 17,2064 53467 DXCH T6NEXT
059274,000087: 17,2065 23465 LXCH NXT6ADR
059275,000088: 17,2066 54031 TS TIME6
059276,000089:
059277,000090: 17,2067 67730 AD PRIO37
059278,000091: 17,2070 54000 TS A
059279,000092: 17,2071 12075 TCF ENABLET6
059280,000093: 17,2072 34733 CA POSMAX
059281,000094: 17,2073 54031 TS TIME6
059282,000095: 17,2074 12115 TCF GOCH56
059283,000096: 17,2075 00006 ENABLET6 EXTEND
059284,000097: 17,2076 23265 QXCH C13QSAV
059285,000098: 17,2077 22070 LXCH RUPTREG1
059286,000099: 17,2100 06022 TC C13STALL
059287,000100: 17,2101 00006 EXTEND
059288,000101: 17,2102 23265 QXCH C13QSAV
059289,000102: 17,2103 22070 LXCH RUPTREG1
059290,000103: 17,2104 34735 CAF BIT15
059291,000104: 17,2105 00006 EXTEND
059292,000105: 17,2106 05013 WOR CHAN13
059293,000106: 17,2107 31466 CA T6NEXT
059294,000107: 17,2110 67730 AD PRIO37
059295,000108: 17,2111 54000 TS A
059296,000109: 17,2112 12115 TCF GOCH56
059297,000110: 17,2113 34733 CA POSMAX
059298,000111: 17,2114 55466 TS T6NEXT
059299,000112: 17,2115 50001 GOCH56 INDEX L
059300,000113: 17,2116 15743 TCF WRITEP -1
059301,000114:
059302,000115: 5743 BLOCK 02
059303,000116: 4000 SETLOC FFTAG9
059304,000117: 4000 BANK
059305,000118: 5743 E6,1635 EBANK= CDUXD
059306,000119: 5743 COUNT* $$/DAPT6
059307,000120:
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Page 1395 |
059309,000122: 5743 31472 CA NEXTP
059310,000123: 5744 00006 WRITEP EXTEND
059311,000124: 5745 01006 WRITE CHAN6
059312,000125: 5746 00002 TC Q
059313,000126:
059314,000127: 5747 31473 CA NEXTU
059315,000128: 5750 54001 WRITEU TS L
059316,000129: 5751 45764 CS 00314OCT
059317,000130: 5752 00006 EXTEND
059318,000131: 5753 02005 RAND CHAN5
059319,000132: 5754 60001 AD L
059320,000133: 5755 00006 EXTEND
059321,000134: 5756 01005 WRITE CHAN5
059322,000135: 5757 00002 TC Q
059323,000136:
059324,000137: 5760 31474 CA NEXTV
059325,000138: 5761 54001 WRITEV TS L
059326,000139: 5762 35764 CA 00314OCT
059327,000140: 5763 15752 TCF -9D
059328,000141: 5764 00314 00314OCT OCT 00314
059329,000142:
059330,000143: 17,2117 BANK 17
059331,000144: 17,2000 SETLOC DAPS2
059332,000145: 17,2000 BANK
059333,000146:
059334,000147: 17,2117 E6,1466 EBANK= T6NEXT
059335,000148: 17,2117 COUNT* $$/DAPT6
059336,000149:
059337,000150: 17,2117 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059338,000151: 17,2120 00006 EXTEND
059339,000152: 17,2121 22012 QXCH QRUPT
059340,000153:
059341,000154: 17,2122 02055 TC T6JOBCHK # CALL T6JOBCHK.
059342,000155:
059343,000156: 17,2123 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
059344,000157:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc