Source Code

This is an attempt to recreate Luminary 99 Rev 2, otherwise known as LUM99R2, from Luminary 99 Rev 1 and ephemeris data from Luminary 116. The differences are confined to the last 10-12 lines of the CONTROLLED CONSTANTS. Luminary 99 Rev 1 source-code was transcribed from a printout in the MIT Museum, while Luminary 116 source code was transcribed from a printout belonging to Don Eyles. AGC developer James Kernan, the "rope mother" for the Apollo 11 Lunar Module's AGC, explains as follows: "At the last minute, Dan Lickly, our chief engineer, appeared with ephemerides updates and it took two tries to get it right. The result was that we created Lum99 Revision 1 and Lum99 Revision 2." It is suspected that the former is what's in the MIT Museum, and the latter is what we are trying to recreate here. As for which revision actually flew in Apollo 11, all of the other available surviving evidence points to Rev 1 rather than to Rev 2, so we're just not sure!

020665,000002:                                                                                                  ## Copyright:   Public domain.
020666,000003:                                                                                                  ## Filename:    RADAR_LEADIN_ROUTINES.agc
020667,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary 1A build 099.
020668,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
020669,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 11.
020670,000007:                                                                                                  ## Assembler:   yaYUL
020671,000008:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
020672,000009:                                                                                                  ## Website:     www.ibiblio.org/apollo.
020673,000010:                                                                                                  ## Pages:       490-491
020674,000011:                                                                                                  ## Mod history: 2009-05-17 RSB  Adapted from the corresponding 
020675,000012:                                                                                                  ##                              Luminary131 file, using page 
020676,000013:                                                                                                  ##                              images from Luminary 1A.
020677,000014:                                                                                                  ##              2016-12-14 RSB  Proofed text comments with octopus/ProoferComments
020678,000015:                                                                                                  ##                              and corrected the errors found.
020679,000016:                                                                                                  ##              2017-03-03 RSB  Snapshot of Luminary 99 Rev 1. 
020680,000017: 

Page 490

020682,000019: 25,2003                                           BANK     25                                    
020683,000020: 25,2000                                           SETLOC   RRLEADIN                              
020684,000021: 25,2000                                           BANK                                           
020685,000022: 
020686,000023: 25,2003  E4,1600                                  EBANK=   RSTACK                                
020687,000024: 
020688,000025:                                                                                                  #  RADAR SAMPLING LOOP.
020689,000026: 
020690,000027: 25,2003                                           COUNT*   $$/RLEAD                              
020691,000028: 25,2003           11755        RADSAMP            CCS      RSAMPDT                               #  TIMES NORMAL ONCE-PER-SECOND SAMPLING.
020692,000029: 25,2004           12006                           TCF      +2                                    
020693,000030: 25,2005           15261                           TCF      TASKOVER                              #  +0 INSERTED MANUALLY TERMINATES TEST.
020694,000031: 
020695,000032: 25,2006           05203                           TC       WAITLIST                              
020696,000033: 25,2007  E4,1600                                  EBANK=   RSTACK                                
020697,000034: 25,2007           02003 52064                     2CADR    RADSAMP                               
020698,000035: 
020699,000036: 25,2011           37713                           CAF      PRIO25                                
020700,000037: 25,2012           05072                           TC       NOVAC                                 
020701,000038: 25,2013  E4,1600                                  EBANK=   RSTACK                                
020702,000039: 25,2013           02023 52064                     2CADR    DORSAMP                               
020703,000040: 
020704,000041: 25,2015           34736                           CAF      BIT14                                 #  FOR CYCLIC SAMPLING, RTSTDEX=
020705,000042: 25,2016           00006                           EXTEND                                         #  RTSTLOC/2 + RTSTBASE
020706,000043: 25,2017           71754                           MP       RTSTLOC                               
020707,000044: 25,2020           61753                           AD       RTSTBASE                              #  0 FOR RR, 2 FOR LR.
020708,000045: 25,2021           55751                           TS       RTSTDEX                               
020709,000046: 25,2022           15261                           TCF      TASKOVER                              
020710,000047: 
020711,000048:                                                                                                  #  DO THE ACTUAL RADAR SAMPLE.
020712,000049: 
020713,000050: 25,2023           02047        DORSAMP            TC       VARADAR                               #  SELECTS VARIABLE RADAR CHANNEL.
020714,000051: 25,2024           04616                           TC       BANKCALL                              
020715,000052: 25,2025           17714                           CADR     RADSTALL                              
020716,000053: 
020717,000054: 25,2026           25756                           INCR     RFAILCNT                              #  ADVANCE FAIL COUNTER BUT ACCEPT BAD DATA
020718,000055: 
020719,000056: 25,2027           00004        DORSAMP2           INHINT                                         
020720,000057: 25,2030           30101                           CA       FLAGWRD5                              #  DON'T UPDATE RSTACK IF IN R77.
020721,000058: 25,2031           74741                           MASK     R77FLBIT                              
020722,000059: 25,2032           10000                           CCS      A                                     
020723,000060: 25,2033           12037                           TCF      +4                                    
020724,000061: 
020725,000062: 25,2034           53102                           DXCH     SAMPLSUM                              
020726,000063: 25,2035           51754                           INDEX    RTSTLOC                               
020727,000064: 25,2036           53601                           DXCH     RSTACK                                
020728,000065: 
020729,000066: 25,2037           41754                           CS       RTSTLOC                               #  CYCLE RTSTLOC.
020730,000067: 25,2040           61752                           AD       RTSTMAX                               
020731,000068: 25,2041           00006                           EXTEND                                         
020732,000069: 

Page 491

020734,000071: 25,2042           12045                           BZF      +3                                    
020735,000072: 25,2043           31754                           CA       RTSTLOC                               
020736,000073: 25,2044           64752                           AD       TWO                                   #  STORAGE IS DP
020737,000074: 25,2045           55754                           TS       RTSTLOC                               
020738,000075: 25,2046           15155                           TCF      ENDOFJOB                              #  CONTINUOUS SAMPLING AND 2N TRIES - GONE.
020739,000076: 
020740,000077:                                                                                                  #  VARIABLE RADAR DATA CALLER FOR ONE MEASUREMENT ONLY.
020741,000078: 
020742,000079: 25,2047           34753        VARADAR            CAF      ONE                                   #  WILL BE SENT TO RADAR ROUTINE IN A BY
020743,000080: 25,2050           54133                           TS       BUF2                                  #  SWCALL.
020744,000081: 25,2051           51751                           INDEX    RTSTDEX                               
020745,000082: 25,2052           32054                           CAF      RDRLOCS                               
020746,000083: 25,2053           14622                           TCF      SWCALL                                #  NOT TOUCHING Q.
020747,000084: 
020748,000085: 25,2054           53105        RDRLOCS            CADR     RRRANGE                               #  = 0
020749,000086: 25,2055           53103                           CADR     RRRDOT                                #  = 1
020750,000087: 25,2056           53101                           CADR     LRVELX                                #  = 2
020751,000088: 25,2057           53077                           CADR     LRVELY                                #  = 3
020752,000089: 25,2060           53075                           CADR     LRVELZ                                #  = 4
020753,000090: 25,2061           53073                           CADR     LRALT                                 #  = 5
020754,000091: 
020755,000092: 

End of include-file RADAR_LEADIN_ROUTINES.agc.  Parent file is MAIN.agc