Source Code
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These source-code files were from the printout at the MIT Museum, with many thanks
to Deborah Douglas, the Museum's Curator of Science and Technology, for releasing
it to us. The printout was digitally photographed by Paul Fjeld. A team of
volunteers transcribed the source code manually from these images or, where
appropriate, modified already-transcribed but similar source Luminary 131 (Apollo 13)
source code to agree with the images from the printout. Note that the page images
presented online are of reduced quality, and that higher-quality images
are available. Report any conversion errors or legibility
problems in page images to info@sandroid.org.
Notations on the program listing read, in part:GAP: ASSEMBLE REVISION 001 OF AGC PROGRAM LMY99 BY NASA 2021112-061 20'35 OCT. 28,1968Note that the date is the date of the printout, not the date of the program revision. |
060214,000002: ## Copyright: Public domain.
060215,000003: ## Filename: T6-RUPT_PROGRAMS.agc
060216,000004: ## Purpose: Part of the source code for Luminary 1A build 099.
060217,000005: ## It is part of the source code for the Lunar Module's (LM)
060218,000006: ## Apollo Guidance Computer (AGC), for Apollo 11.
060219,000007: ## Assembler: yaYUL
060220,000008: ## Contact: Ron Burkey <info@sandroid.org>.
060221,000009: ## Website: www.ibiblio.org/apollo.
060222,000010: ## Pages: 1403-1405
060223,000011: ## Mod history: 2009-05-10 SN (Sergio Navarro). Started adapting
060224,000012: ## from the Luminary131/ file of the same
060225,000013: ## name, using Luminary099 page images.
060226,000014: ## 2016-12-18 RSB Proofed text comments with octopus/ProoferComments
060227,000015: ## and corrected the errors found.
060228,000016: ## 2017-08-29 MAS Fixed a comment-text error found while transcribing
060229,000017: ## Zerlina 56.
060230,000018: ##
060231,000019: ## This source code has been transcribed or otherwise adapted from
060232,000020: ## digitized images of a hardcopy from the MIT Museum. The digitization
060233,000021: ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
060234,000022: ## the Museum. Many thanks to both. The images (with suitable reduction
060235,000023: ## in storage size and consequent reduction in image quality as well) are
060236,000024: ## available online at www.ibiblio.org/apollo. If for some reason you
060237,000025: ## find that the images are illegible, contact me at info@sandroid.org
060238,000026: ## about getting access to the (much) higher-quality images which Paul
060239,000027: ## actually created.
060240,000028: ##
060241,000029: ## Notations on the hardcopy document read, in part:
060242,000030: ##
060243,000031: ## Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
060244,000032: ## 16:27 JULY 14, 1969
060245,000033:
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Page 1403 |
060247,000035: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
060248,000036: # (2) DOT6RUPT
060249,000037: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
060250,000038:
060251,000039: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
060252,000040: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
060253,000041: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
060254,000042: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
060255,000043: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
060256,000044: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
060257,000045: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
060258,000046: # B. THE TIME6 CLOCK IS ENABLED.
060259,000047: # C. TIME6 IS INTERROGATED AND IS:
060260,000048: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
060261,000049: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
060262,000050: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
060263,000051: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
060264,000052: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
060265,000053: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
060266,000054: # C. A T6RUPT IS IN PROCESS NOW.
060267,000055: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
060268,000056: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
060269,000057: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
060270,000058:
060271,000059: # T6JOBCHK CALLING SEQUENCE:
060272,000060: # L TC T6JOBCHK
060273,000061: # L+1 (RETURN)
060274,000062:
060275,000063: # DOT6RUPT CALLING SEQUENCE:
060276,000064: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
060277,000065: # EXTEND
060278,000066: # DCA T6ADR
060279,000067: # DTCB
060280,000068:
060281,000069: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
060282,000070:
060283,000071: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
060284,000072: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
060285,000073:
060286,000074: # ALARM/ABORT MODES: NONE.
060287,000075:
060288,000076: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
060289,000077: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
060290,000078: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
060291,000079:
060292,000080: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
060293,000081:
060294,000082: 5753 BLOCK 02
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Page 1404 |
060296,000084: 17,2027 BANK 17
060297,000085: 17,2000 SETLOC DAPS2
060298,000086: 17,2000 BANK
060299,000087: 17,2027 E6,1466 EBANK= T6NEXT
060300,000088: 17,2027 COUNT* $$/DAPT6
060301,000089:
060302,000090: 17,2027 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
060303,000091: 17,2030 00002 TC Q # NONE: CLOCK COUTING DOWN.
060304,000092: 17,2031 05705 TC CCSHOLE
060305,000093: 17,2032 02032 TC T6JOBCHK +3
060306,000094:
060307,000095: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
060308,000096:
060309,000097: 17,2033 34733 T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
060310,000098: 17,2034 00006 EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
060311,000099: 17,2035 03013 WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
060312,000100:
060313,000101: 17,2036 34733 CA POSMAX
060314,000102: 17,2037 22007 ZL
060315,000103: 17,2040 53471 DXCH T6FURTHA
060316,000104: 17,2041 53467 DXCH T6NEXT
060317,000105: 17,2042 23465 LXCH NXT6ADR
060318,000106: 17,2043 54031 TS TIME6
060319,000107:
060320,000108: 17,2044 67725 AD PRIO37
060321,000109: 17,2045 54000 TS A
060322,000110: 17,2046 12052 TCF ENABLET6
060323,000111: 17,2047 34733 CA POSMAX
060324,000112: 17,2050 54031 TS TIME6
060325,000113: 17,2051 12063 TCF GOCH56
060326,000114: 17,2052 34735 ENABLET6 CA BIT15
060327,000115: 17,2053 00006 EXTEND
060328,000116: 17,2054 05013 WOR CHAN13
060329,000117: 17,2055 31466 CA T6NEXT
060330,000118: 17,2056 67725 AD PRIO37
060331,000119: 17,2057 54000 TS A
060332,000120: 17,2060 12063 TCF GOCH56
060333,000121: 17,2061 34733 CA POSMAX
060334,000122: 17,2062 55466 TS T6NEXT
060335,000123: 17,2063 50001 GOCH56 INDEX L
060336,000124: 17,2064 15753 TCF WRITEP -1
060337,000125:
060338,000126: 5753 BLOCK 02
060339,000127: 4000 SETLOC FFTAG9
060340,000128: 4000 BANK
060341,000129: 5753 E6,1635 EBANK= CDUXD
060342,000130: 5753 COUNT* $$/DAPT6
060343,000131:
060344,000132: 5753 31472 CA NEXTP
060345,000133: 5754 00006 WRITEP EXTEND
060346,000134: 5755 01006 WRITE CHAN6
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Page 1405 |
060348,000136: 5756 00002 TC Q
060349,000137:
060350,000138: 5757 31473 CA NEXTU
060351,000139: 5760 54001 WRITEU TS L
060352,000140: 5761 45774 CS 00314OCT
060353,000141: 5762 00006 EXTEND
060354,000142: 5763 02005 RAND CHAN5
060355,000143: 5764 60001 AD L
060356,000144: 5765 00006 EXTEND
060357,000145: 5766 01005 WRITE CHAN5
060358,000146: 5767 00002 TC Q
060359,000147:
060360,000148: 5770 31474 CA NEXTV
060361,000149: 5771 54001 WRITEV TS L
060362,000150: 5772 35774 CA 00314OCT
060363,000151: 5773 15762 TCF -9D
060364,000152: 5774 00314 00314OCT OCT 00314
060365,000153:
060366,000154: 17,2065 BANK 17
060367,000155: 17,2000 SETLOC DAPS2
060368,000156: 17,2000 BANK
060369,000157:
060370,000158: 17,2065 E6,1466 EBANK= T6NEXT
060371,000159: 17,2065 COUNT* $$/DAPT6
060372,000160:
060373,000161: 17,2065 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
060374,000162: 17,2066 00006 EXTEND
060375,000163: 17,2067 22012 QXCH QRUPT
060376,000164:
060377,000165: 17,2070 02027 TC T6JOBCHK # CALL T6JOBCHK.
060378,000166:
060379,000167: 17,2071 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
060380,000168:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc