Source Code
|
These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 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.
|
020800,000002: ## Copyright: Public domain.
020801,000003: ## Filename: RADAR_LEADIN_ROUTINES.agc
020802,000004: ## Purpose: A section of LM131 revision 1.
020803,000005: ## It is part of the reconstructed source code for the final
020804,000006: ## release of the flight software for the Lunar Module's (LM)
020805,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
020806,000008: ## been reconstructed from a listing of Luminary 131 and a dump
020807,000009: ## of a core rope memory module B5, part number 2010802-171,
020808,000010: ## which is the only module different between LM131 revision 1
020809,000011: ## and Luminary 131. The executable generated from this source
020810,000012: ## has been verified against the module dump, so while the names,
020811,000013: ## comments, and ordering may not be exactly correct, the
020812,000014: ## resulting binary is.
020813,000015: ## Reference: pp. 494-495
020814,000016: ## Assembler: yaYUL
020815,000017: ## Contact: Ron Burkey <info@sandroid.org>.
020816,000018: ## Website: www.ibiblio.org/apollo/index.html
020817,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
020818,000020:
|
|
Page 494
|
020820,000022: 25,2003 BANK 25
020821,000023: 25,2000 SETLOC RRLEADIN
020822,000024: 25,2000 BANK
020823,000025:
020824,000026: 25,2003 E4,1600 EBANK= RSTACK
020825,000027:
020826,000028: # RADAR SAMPLING LOOP.
020827,000029: 25,2003 COUNT* $$/RLEAD
020828,000030: 25,2003 11777 RADSAMP CCS RSAMPDT # TIMES NORMAL ONCE-PER-SECOND SAMPLING.
020829,000031: 25,2004 12006 TCF +2
020830,000032: 25,2005 15261 TCF TASKOVER # +0 INSERTED MANUALLY TERMINATES TEST.
020831,000033:
020832,000034: 25,2006 05203 TC WAITLIST
020833,000035: 25,2007 E4,1600 EBANK= RSTACK
020834,000036: 25,2007 02003 52064 2CADR RADSAMP
020835,000037:
020836,000038: 25,2011 37716 CAF PRIO25
020837,000039: 25,2012 05072 TC NOVAC
020838,000040: 25,2013 E4,1600 EBANK= RSTACK
020839,000041: 25,2013 02023 52064 2CADR DORSAMP
020840,000042:
020841,000043: 25,2015 34736 CAF BIT14 # FOR CYCLIC SAMPLING, RTSTDEX=
020842,000044: 25,2016 00006 EXTEND # RTSTLOC/2 + RTSTBASE
020843,000045: 25,2017 71776 MP RTSTLOC
020844,000046: 25,2020 61775 AD RTSTBASE # 0 FOR RR, 2 FOR LR.
020845,000047: 25,2021 55773 TS RTSTDEX
020846,000048: 25,2022 15261 TCF TASKOVER
020847,000049:
020848,000050: # DO THE ACTUAL RADAR SAMPLE.
020849,000051:
020850,000052: 25,2023 02060 DORSAMP TC VARADAR # SELECTS VARIABLE RADAR CHANNEL.
020851,000053: 25,2024 04616 TC BANKCALL
020852,000054: 25,2025 17705 CADR RADSTALL
020853,000055:
020854,000056: 25,2026 25575 INCR RFAILCNT # ADVANCE FAIL COUNTER BUT ACCEPT BAD DATA
020855,000057:
020856,000058: 25,2027 00004 DORSAMP2 INHINT
020857,000059: 25,2030 30101 CA FLAGWRD5 # DON'T UPDATE RSTACK IF IN R77.
020858,000060: 25,2031 74741 MASK R77FLBIT
020859,000061: 25,2032 10000 CCS A
020860,000062: 25,2033 12050 TCF R77IN
020861,000063:
020862,000064: 25,2034 53101 DXCH SAMPLSUM
020863,000065: 25,2035 51776 INDEX RTSTLOC
020864,000066: 25,2036 53601 DXCH RSTACK
020865,000067:
020866,000068: 25,2037 30110 CA RADMODES
020867,000069: 25,2040 00006 EXTEND
020868,000070: 25,2041 06033 RXOR CHAN33
|
|
Page 495
|
020870,000072: 25,2042 74746 MASK BIT6
020871,000073: 25,2043 00006 EXTEND
020872,000074: 25,2044 12050 BZF R77IN
020873,000075:
020874,000076: 25,2045 05567 TC ALARM
020875,000077: 25,2046 00522 OCT 522
020876,000078: 25,2047 25575 INCR RFAILCNT
020877,000079:
020878,000080: 25,2050 41776 R77IN CS RTSTLOC # CYCLE RTSTLOC
020879,000081: 25,2051 61774 AD RTSTMAX
020880,000082: 25,2052 00006 EXTEND
020881,000083: 25,2053 12056 BZF +3
020882,000084: 25,2054 31776 CA RTSTLOC
020883,000085: 25,2055 64752 AD TWO # STORAGE IS DP
020884,000086: 25,2056 55776 TS RTSTLOC
020885,000087: 25,2057 15155 TCF ENDOFJOB # CONTINUOUS SAMPLING AND 2N TRIES - GONE.
020886,000088:
020887,000089: # VARIABLE RADAR DATA CALLER FOR ONE MEASUREMENT ONLY.
020888,000090:
020889,000091: 25,2060 34753 VARADAR CAF ONE # WILL BE SENT TO RADAR ROUTINE IN A BY
020890,000092: 25,2061 54133 TS BUF2 # SWCALL.
020891,000093: 25,2062 51773 INDEX RTSTDEX
020892,000094: 25,2063 32065 CAF RDRLOCS
020893,000095: 25,2064 14622 TCF SWCALL # NOT TOUCHING Q.
020894,000096:
020895,000097: 25,2065 53114 RDRLOCS CADR RRRANGE # = 0
020896,000098: 25,2066 53112 CADR RRRDOT # = 1
020897,000099: 25,2067 53110 CADR LRVELX # = 2
020898,000100: 25,2070 53106 CADR LRVELY # = 3
020899,000101: 25,2071 53104 CADR LRVELZ # = 4
020900,000102: 25,2072 53102 CADR LRALT # = 5
020901,000103:
020902,000104:
End of include-file RADAR_LEADIN_ROUTINES.agc. Parent file is MAIN.agc