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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020662,000002: ## Copyright: Public domain.
020663,000003: ## Filename: RADAR_LEADIN_ROUTINES.agc
020664,000004: ## Purpose: A section of Luminary revision 97.
020665,000005: ## It is part of the reconstructed source code for the
020666,000006: ## original release of the flight software for the Lunar
020667,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
020668,000008: ## The code has been recreated from a copy of Luminary 99
020669,000009: ## revision 001, using asterisks indicating changed lines in
020670,000010: ## the listing and Luminary Memos #83 and #85, which list
020671,000011: ## changes between Luminary 97 and 98, and 98 and 99. The
020672,000012: ## code has been adapted such that the resulting bugger words
020673,000013: ## exactly match those specified for Luminary 97 in NASA drawing
020674,000014: ## 2021152D, which gives relatively high confidence that the
020675,000015: ## reconstruction is correct.
020676,000016: ## Reference: pp. 490-491
020677,000017: ## Assembler: yaYUL
020678,000018: ## Contact: Ron Burkey <info@sandroid.org>.
020679,000019: ## Website: www.ibiblio.org/apollo/index.html
020680,000020: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
020681,000021:
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Page 490
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020683,000023: 25,2003 BANK 25
020684,000024: 25,2000 SETLOC RRLEADIN
020685,000025: 25,2000 BANK
020686,000026:
020687,000027: 25,2003 E4,1600 EBANK= RSTACK
020688,000028:
020689,000029: # RADAR SAMPLING LOOP.
020690,000030:
020691,000031: 25,2003 COUNT* $$/RLEAD
020692,000032: 25,2003 11755 RADSAMP CCS RSAMPDT # TIMES NORMAL ONCE-PER-SECOND SAMPLING.
020693,000033: 25,2004 12006 TCF +2
020694,000034: 25,2005 15261 TCF TASKOVER # +0 INSERTED MANUALLY TERMINATES TEST.
020695,000035:
020696,000036: 25,2006 05203 TC WAITLIST
020697,000037: 25,2007 E4,1600 EBANK= RSTACK
020698,000038: 25,2007 02003 52064 2CADR RADSAMP
020699,000039:
020700,000040: 25,2011 37713 CAF PRIO25
020701,000041: 25,2012 05072 TC NOVAC
020702,000042: 25,2013 E4,1600 EBANK= RSTACK
020703,000043: 25,2013 02023 52064 2CADR DORSAMP
020704,000044:
020705,000045: 25,2015 34736 CAF BIT14 # FOR CYCLIC SAMPLING, RTSTDEX=
020706,000046: 25,2016 00006 EXTEND # RTSTLOC/2 + RTSTBASE
020707,000047: 25,2017 71754 MP RTSTLOC
020708,000048: 25,2020 61753 AD RTSTBASE # 0 FOR RR, 2 FOR LR.
020709,000049: 25,2021 55751 TS RTSTDEX
020710,000050: 25,2022 15261 TCF TASKOVER
020711,000051:
020712,000052: # DO THE ACTUAL RADAR SAMPLE.
020713,000053:
020714,000054: 25,2023 02047 DORSAMP TC VARADAR # SELECTS VARIABLE RADAR CHANNEL.
020715,000055: 25,2024 04616 TC BANKCALL
020716,000056: 25,2025 17714 CADR RADSTALL
020717,000057:
020718,000058: 25,2026 25756 INCR RFAILCNT # ADVANCE FAIL COUNTER BUT ACCEPT BAD DATA
020719,000059:
020720,000060: 25,2027 00004 DORSAMP2 INHINT
020721,000061: 25,2030 30101 CA FLAGWRD5 # DON'T UPDATE RSTACK IF IN R77.
020722,000062: 25,2031 74741 MASK R77FLBIT
020723,000063: 25,2032 10000 CCS A
020724,000064: 25,2033 12037 TCF +4
020725,000065:
020726,000066: 25,2034 53102 DXCH SAMPLSUM
020727,000067: 25,2035 51754 INDEX RTSTLOC
020728,000068: 25,2036 53601 DXCH RSTACK
020729,000069:
020730,000070: 25,2037 41754 CS RTSTLOC # CYCLE RTSTLOC.
020731,000071: 25,2040 61752 AD RTSTMAX
020732,000072: 25,2041 00006 EXTEND
020733,000073:
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Page 491
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020735,000075: 25,2042 12045 BZF +3
020736,000076: 25,2043 31754 CA RTSTLOC
020737,000077: 25,2044 64752 AD TWO # STORAGE IS DP
020738,000078: 25,2045 55754 TS RTSTLOC
020739,000079: 25,2046 15155 TCF ENDOFJOB # CONTINUOUS SAMPLING AND 2N TRIES - GONE.
020740,000080:
020741,000081: # VARIABLE RADAR DATA CALLER FOR ONE MEASUREMENT ONLY.
020742,000082:
020743,000083: 25,2047 34753 VARADAR CAF ONE # WILL BE SENT TO RADAR ROUTINE IN A BY
020744,000084: 25,2050 54133 TS BUF2 # SWCALL.
020745,000085: 25,2051 51751 INDEX RTSTDEX
020746,000086: 25,2052 32054 CAF RDRLOCS
020747,000087: 25,2053 14622 TCF SWCALL # NOT TOUCHING Q.
020748,000088:
020749,000089: 25,2054 53105 RDRLOCS CADR RRRANGE # = 0
020750,000090: 25,2055 53103 CADR RRRDOT # = 1
020751,000091: 25,2056 53101 CADR LRVELX # = 2
020752,000092: 25,2057 53077 CADR LRVELY # = 3
020753,000093: 25,2060 53075 CADR LRVELZ # = 4
020754,000094: 25,2061 53073 CADR LRALT # = 5
020755,000095:
020756,000096:
End of include-file RADAR_LEADIN_ROUTINES.agc. Parent file is MAIN.agc