Source Code
|
These source-code files are part of a reconstructed copy of Luminary 97, the
second release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software. It was created to fix two incorrect ephemeris constants in
Luminary 96, as described by anomaly report LNY-59.
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.
|
059209,000002: ## Copyright: Public domain.
059210,000003: ## Filename: T6-RUPT_PROGRAMS.agc
059211,000004: ## Purpose: A section of Luminary revision 97.
059212,000005: ## It is part of the reconstructed source code for the
059213,000006: ## second release of the flight software for the Lunar
059214,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
059215,000008: ## It was created to fix two incorrect ephemeris constants in
059216,000009: ## Luminary 96, as described by anomaly report LNY-59.
059217,000010: ## The code has been recreated from a copy of Luminary 99
059218,000011: ## revision 001, using asterisks indicating changed lines in
059219,000012: ## the listing and Luminary Memos #83 and #85, which list
059220,000013: ## changes between Luminary 97 and 98, and 98 and 99. The
059221,000014: ## code has been adapted such that the resulting bugger words
059222,000015: ## exactly match those specified for Luminary 97 in NASA drawing
059223,000016: ## 2021152D, which gives relatively high confidence that the
059224,000017: ## reconstruction is correct.
059225,000018: ## Reference: pp. 1403-1405
059226,000019: ## Assembler: yaYUL
059227,000020: ## Contact: Ron Burkey <info@sandroid.org>.
059228,000021: ## Website: www.ibiblio.org/apollo/index.html
059229,000022: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
059230,000023:
|
|
Page 1403
|
059232,000025: # PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
059233,000026: # (2) DOT6RUPT
059234,000027: # MODIFICATION BY: LOWELL G HULL (A.C.ELECTRONICS)
059235,000028:
059236,000029: # THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
059237,000030: # SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
059238,000031: # ESTABLISHED AND MUST NOT BE TAMPERED WITH:
059239,000032: # 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
059240,000033: # 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
059241,000034: # 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
059242,000035: # A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
059243,000036: # B. THE TIME6 CLOCK IS ENABLED.
059244,000037: # C. TIME6 IS INTERROGATED AND IS:
059245,000038: # I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
059246,000039: # II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
059247,000040: # III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
059248,000041: # IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
059249,000042: # A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
059250,000043: # B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
059251,000044: # C. A T6RUPT IS IN PROCESS NOW.
059252,000045: # 4) ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
059253,000046: # EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
059254,000047: # (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
059255,000048:
059256,000049: # T6JOBCHK CALLING SEQUENCE:
059257,000050: # L TC T6JOBCHK
059258,000051: # L+1 (RETURN)
059259,000052:
059260,000053: # DOT6RUPT CALLING SEQUENCE:
059261,000054: # DXCH ARUPT T6RUPT LEAD IN AT LOCATION 4004.
059262,000055: # EXTEND
059263,000056: # DCA T6ADR
059264,000057: # DTCB
059265,000058:
059266,000059: # SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
059267,000060:
059268,000061: # NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
059269,000062: # DOT6RUPT TRANSFERS CONTROL TO RESUME.
059270,000063:
059271,000064: # ALARM/ABORT MODES: NONE.
059272,000065:
059273,000066: # INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
059274,000067: # T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
059275,000068: # T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
059276,000069:
059277,000070: # DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
059278,000071:
059279,000072: 5753 BLOCK 02
|
|
Page 1404
|
059281,000074: 17,2027 BANK 17
059282,000075: 17,2000 SETLOC DAPS2
059283,000076: 17,2000 BANK
059284,000077: 17,2027 E6,1466 EBANK= T6NEXT
059285,000078: 17,2027 COUNT* $$/DAPT6
059286,000079:
059287,000080: 17,2027 10031 T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
059288,000081: 17,2030 00002 TC Q # NONE: CLOCK COUTING DOWN.
059289,000082: 17,2031 05705 TC CCSHOLE
059290,000083: 17,2032 02032 TC T6JOBCHK +3
059291,000084:
059292,000085: # CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E. WHEN A T6RUPT MUST BE PROCESSED).
059293,000086:
059294,000087: 17,2033 34733 T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
059295,000088: 17,2034 00006 EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
059296,000089: 17,2035 03013 WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
059297,000090:
059298,000091: 17,2036 34733 CA POSMAX
059299,000092: 17,2037 22007 ZL
059300,000093: 17,2040 53471 DXCH T6FURTHA
059301,000094: 17,2041 53467 DXCH T6NEXT
059302,000095: 17,2042 23465 LXCH NXT6ADR
059303,000096: 17,2043 54031 TS TIME6
059304,000097:
059305,000098: 17,2044 67725 AD PRIO37
059306,000099: 17,2045 54000 TS A
059307,000100: 17,2046 12052 TCF ENABLET6
059308,000101: 17,2047 34733 CA POSMAX
059309,000102: 17,2050 54031 TS TIME6
059310,000103: 17,2051 12063 TCF GOCH56
059311,000104: 17,2052 34735 ENABLET6 CA BIT15
059312,000105: 17,2053 00006 EXTEND
059313,000106: 17,2054 05013 WOR CHAN13
059314,000107: 17,2055 31466 CA T6NEXT
059315,000108: 17,2056 67725 AD PRIO37
059316,000109: 17,2057 54000 TS A
059317,000110: 17,2060 12063 TCF GOCH56
059318,000111: 17,2061 34733 CA POSMAX
059319,000112: 17,2062 55466 TS T6NEXT
059320,000113: 17,2063 50001 GOCH56 INDEX L
059321,000114: 17,2064 15753 TCF WRITEP -1
059322,000115:
059323,000116: 5753 BLOCK 02
059324,000117: 4000 SETLOC FFTAG9
059325,000118: 4000 BANK
059326,000119: 5753 E6,1635 EBANK= CDUXD
059327,000120: 5753 COUNT* $$/DAPT6
059328,000121:
059329,000122: 5753 31472 CA NEXTP
059330,000123: 5754 00006 WRITEP EXTEND
059331,000124: 5755 01006 WRITE CHAN6
|
|
Page 1405
|
059333,000126: 5756 00002 TC Q
059334,000127:
059335,000128: 5757 31473 CA NEXTU
059336,000129: 5760 54001 WRITEU TS L
059337,000130: 5761 45774 CS 00314OCT
059338,000131: 5762 00006 EXTEND
059339,000132: 5763 02005 RAND CHAN5
059340,000133: 5764 60001 AD L
059341,000134: 5765 00006 EXTEND
059342,000135: 5766 01005 WRITE CHAN5
059343,000136: 5767 00002 TC Q
059344,000137:
059345,000138: 5770 31474 CA NEXTV
059346,000139: 5771 54001 WRITEV TS L
059347,000140: 5772 35774 CA 00314OCT
059348,000141: 5773 15762 TCF -9D
059349,000142: 5774 00314 00314OCT OCT 00314
059350,000143:
059351,000144: 17,2065 BANK 17
059352,000145: 17,2000 SETLOC DAPS2
059353,000146: 17,2000 BANK
059354,000147:
059355,000148: 17,2065 E6,1466 EBANK= T6NEXT
059356,000149: 17,2065 COUNT* $$/DAPT6
059357,000150:
059358,000151: 17,2065 22016 DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
059359,000152: 17,2066 00006 EXTEND
059360,000153: 17,2067 22012 QXCH QRUPT
059361,000154:
059362,000155: 17,2070 02027 TC T6JOBCHK # CALL T6JOBCHK.
059363,000156:
059364,000157: 17,2071 15270 TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
059365,000158:
End of include-file T6-RUPT_PROGRAMS.agc. Parent file is MAIN.agc