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!

013751,000002:                                                                                                  ## Copyright:   Public domain.
013752,000003:                                                                                                  ## Filename:    R63.agc
013753,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary 1A build 099.
013754,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
013755,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 11.
013756,000007:                                                                                                  ## Assembler:   yaYUL
013757,000008:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
013758,000009:                                                                                                  ## Website:     www.ibiblio.org/apollo.
013759,000010:                                                                                                  ## Pages:       338-341
013760,000011:                                                                                                  ## Mod history: 2009-05-16 RSB  Adapted from the corresponding 
013761,000012:                                                                                                  ##                              Luminary131 file, using page 
013762,000013:                                                                                                  ##                              images from Luminary 1A.
013763,000014:                                                                                                  ##              2016-12-14 RSB  Proofed text comments with octopus/ProoferComments
013764,000015:                                                                                                  ##                              and corrected the errors found.
013765,000016:                                                                                                  ##              2017-01-26 RSB  Back-ported a comment-text fix from Luminary 69.
013766,000017:                                                                                                  ##              2017-03-03 RSB  Snapshot of Luminary 99 Rev 1. 
013767,000018:                                                                                                  ##              2017-03-07 RSB  Comment-text fixes noted in proofing Luminary 116.
013768,000019: 

Page 338

013770,000021:                                                                                                  #  SUBROUTINE NAME:      V89CALL
013771,000022:                                                                                                  #  MOD NO:       0                       DATE:           9 JAN 1968
013772,000023:                                                                                                  #  MOD BY:       DIGITAL DEVEL GROUP     LOG SECTION:    R63
013773,000024: 
013774,000025:                                                                                                  #  FUNCTIONAL DESCRIPTION:
013775,000026: 
013776,000027:                                                                                                  #  CALLED BY VERB 89 ENTER DURING P00.  PRIO 10 USED.  CALCULATES AND
013777,000028:                                                                                                  #  DISPLAYS FINAL FDAI BALL ANGLES TO POINT LM +X OR +Z AXIS AT CSM.
013778,000029: 
013779,000030:                                                                                                  #  1. KEY IN V 89 E ONLY IF IN PROG 00.  IF NOT IN P00, OPERATOR ERROR AND
013780,000031:                                                                                                  #  EXIT R63, OTHERWISE CONTINUE.
013781,000032: 
013782,000033:                                                                                                  #  2. IF IN P00, DO IMU STATUS CHECK ROUTINE (R02BOTH).  IF IMU ON AND ITS
013783,000034:                                                                                                  #  ORIENTATION KNOWN TO LGC, CONTINUE.
013784,000035: 
013785,000036:                                                                                                  #  3. FLASH DISPLAY V 04 N 06.  R2 INDICATES WHICH SPACECRAFT AXIS IS TO
013786,000037:                                                                                                  #  BE POINTED AT CSM.  INITIAL CHOICE IS PREFERRED (+Z) AXIS (R2=1).
013787,000038:                                                                                                  #  ASTRONAUT CAN CHANGE TO (+X) AXIS (R2 NOT =1) BY V 22 E 2 E.  CONTINUE
013788,000039:                                                                                                  #  AFTER KEYING IN PROCEED.
013789,000040: 
013790,000041:                                                                                                  #  4. BOTH VEHICLE STATE VECTORS UPDATED BY CONIC EQS.
013791,000042: 
013792,000043:                                                                                                  #  5. HALF MAGNITUDE UNIT LOS VECTOR (IN STABLE MEMBER COORDINATES) AND
013793,000044:                                                                                                  #  HALF MAGNITUDE UNIT SPACECRAFT AXIS VECTOR (IN BODY COORDINATES)
013794,000045:                                                                                                  #  PREPARED FOR VECPOINT.
013795,000046: 
013796,000047:                                                                                                  #  6. GIMBAL ANGLES FROM VECPOINT TRANSFORMED INTO FDAI BALL ANGLES BY
013797,000048:                                                                                                  #  BALLANGS.  FLASH DISPLAY V 06 N 18 AND AWAIT RESPONSE.
013798,000049: 
013799,000050:                                                                                                  #  7.    RECYCLE - RETURN TO STEP 4.
013800,000051:                                                                                                  #        TERMINATE - EXIT R63.
013801,000052:                                                                                                  #        PROCEED - RESET 3AXISFLG AND CALL R60LEM FOR ATTITUDE MANEUVER.
013802,000053: 
013803,000054:                                                                                                  #  CALLING SEQUENCE:     V 89 E.
013804,000055: 
013805,000056:                                                                                                  #  SUBROUTINES CALLED:   CHKPOOH, R02BOTH, GOXDSPF, CSMCONIC, LEMCONIC,
013806,000057:                                                                                                  #                        VECPOINT, BALLANGS, R60LEM.
013807,000058: 
013808,000059:                                                                                                  #  NORMAL EXIT MODES:    TC ENDEXT
013809,000060: 
013810,000061:                                                                                                  #  ALARMS:       1. OPERATOR ERROR IF NOT IN P00.
013811,000062:                                                                                                  #                2. PROGRAM ALARM IF IMU IS OFF.
013812,000063:                                                                                                  #                3. PROGRAM ALARM IF IMU ORIENTATION IS UNKNOWN.
013813,000064: 
013814,000065:                                                                                                  #  OUTPUT:       NONE
013815,000066: 
013816,000067:                                                                                                  #  ERASABLE INITIALIZATION REQUIRED:  NONE
013817,000068: 
013818,000069:                                                                                                  #  DEBRIS:       OPTION1, +1, TDEC1, POINTVSM, SCAXIS, CPHI, CTHETA, CPSI,

Page 339

013820,000071:                                                                                                  #                3AXISFLG.
013821,000072: 
013822,000073: 06,3715  E4,1606                                  EBANK=   RONE                                  
013823,000074: 32,2217                                           BANK     32                                    
013824,000075: 26,2000                                           SETLOC   BAWLANGS                              
013825,000076: 26,2000                                           BANK                                           
013826,000077: 
013827,000078: 26,2022                                           COUNT*   $$/R63                                
013828,000079: 26,2022           04616        V89CALL            TC       BANKCALL                              #  IMU STATUS CHECK.  RETURNS IF ORIENTATION
013829,000080: 26,2023           11254                           CADR     R02BOTH                               #  KNOWN.  ALARMS IF NOT.
013830,000081: 26,2024           36245                           CAF      THREE                                 #  ALLOW ASTRONAUT TO SELECT DESIRED
013831,000082: 26,2025           55051                           TS       OPTIONX                               #  TRACKING ATTITUDE AXIS.
013832,000083: 26,2026           34753                           CAF      ONE                                   
013833,000084: 26,2027           55052                           TS       OPTIONX    +1                         
013834,000085: 26,2030           32117                           CAF      VB04N12                               #  V 04 N 12
013835,000086: 26,2031           04616                           TC       BANKCALL                              
013836,000087: 26,2032           20476                           CADR     GOFLASH                               
013837,000088: 26,2033           05472                           TC       ENDEXT                                #  TERMINATE
013838,000089: 26,2034           02036                           TC       +2                                    #  PROCEED
013839,000090: 26,2035           02030                           TC       -5                                    #  DATA IN. OPTION1+1 = 1 FOR Z AXIS
013840,000091: 26,2036           06037        V89RECL            TC       INTPRET                               #                    = 2 FOR X AXIS
013841,000092: 26,2037           43234                           RTB      DAD                                   
013842,000093: 26,2040           21573                                    LOADTIME                              #  READ PRESENT TIME
013843,000094: 26,2041           14122                                    DP1MIN                                
013844,000095: 26,2042           02205                           STORE    TSTART82                              #  SAVE TIME FOR LEMCONIC CALL
013845,000096: 26,2043           34041                           STCALL   TDEC1                                 #  STORE TIME FOR CSMCONIC CALL
013846,000097: 26,2044           27066                                    CSMCONIC                              #  CSM STATE VECTOR UPDATE
013847,000098: 26,2045           77775                           VLOAD                                          #  CSMCONIC LEFT R VECTOR IN RATT
013848,000099: 26,2046           00001                                    RATT                                  
013849,000100: 26,2047           16207                           STODL    RONE                                  #  SAVE FOR LINE OF SIGHT (LOS) COMPUTATION
013850,000101: 26,2050           02205                                    TSTART82                              
013851,000102: 26,2051           34041                           STCALL   TDEC1                                 #  STORE TIME FOR LEMCONIC CALL
013852,000103: 26,2052           27100                                    LEMCONIC                              #  LEM STATE VECTOR UPDATE
013853,000104: 26,2053           52375                           VLOAD    VSU                                   #  CSM POSITION - LEM POSITION = LOS
013854,000105: 26,2054           02207                                    RONE                                  #  LOS VECTOR LEFT IN MPAC
013855,000106: 26,2055           00001                                    RATT                                  
013856,000107: 26,2056           47121                           MXV      RTB                                   #  (REFSMMAT X LOS).  TRANSFORMS LOS FROM
013857,000108: 26,2057           01734                                    REFSMMAT                              #  REFERENCE COORD TO STAB MEMB COORD.
013858,000109: 26,2060           21726                                    NORMUNIT                              
013859,000110: 26,2061           03773                           STORE    POINTVSM                              #  STORE LOS FOR VECPOINT CALL
013860,000111: 26,2062           77776                           EXIT                                           
013861,000112: 26,2063           41052                           CS       OPTIONX    +1                         #  1 FOR Z AXIS.  2 FOR X AXIS.
013862,000113: 26,2064           64753                           AD       ONE                                   
013863,000114: 26,2065           00006                           EXTEND                                         
013864,000115: 26,2066           12113                           BZF      ALINEZ                                
013865,000116: 26,2067           06037        ALINEX             TC       INTPRET                               #  X AXIS ALIGNMENT
013866,000117: 26,2070           77775                           VLOAD                                          
013867,000118: 26,2071           06520                                    UNITX                                 #  READ (.5, 0, 0)

Page 340

013869,000120: 26,2072           37765        V89CALL1           STCALL   SCAXIS                                #  STORE SELECTED ALIGNMENT AXIS
013870,000121: 26,2073           56040                                    VECPOINT                              #  PUTS DESIRED GIM ANG (OG,IG,MG) IN TMPAC
013871,000122: 26,2074           00322                           STORE    CPHI                                  #  STORE GIMBAL ANGLES FOR BALLANGS CALL.
013872,000123: 26,2075           77776                           EXIT                                           
013873,000124: 26,2076           04616                           TC       BANKCALL                              
013874,000125: 26,2077           54266                           CADR     BALLANGS                              #  PUTS DESIRED BALL ANGLES IN FDAIX,Y,Z
013875,000126: 26,2100           32120                           CAF      VB06N18                               #  V 06 N 18
013876,000127: 26,2101           04616                           TC       BANKCALL                              #  NOUN 18 REFERS TO FDAIX,Y,Z
013877,000128: 26,2102           20476                           CADR     GOFLASH                               
013878,000129: 26,2103           05472                           TC       ENDEXT                                #  TERMINATE
013879,000130: 26,2104           02106                           TC       +2                                    #  PROCEED
013880,000131: 26,2105           02036                           TC       V89RECL                               #  RECYCLE
013881,000132: 26,2106           05516                           TC       DOWNFLAG                              #  RESET 3 AXIS FLAG
013882,000133: 26,2107           00124                           ADRES    3AXISFLG                              #  RESET BIT6 FLAG WORD 5
013883,000134: 26,2110           04616                           TC       BANKCALL                              #  PERFORMS LEM MANEUVER TO ALIGN SELECTED
013884,000135: 26,2111           54123                           CADR     R60LEM                                #  SPACECRAFT AXIS TO CSM.
013885,000136: 26,2112           15472                           TCF      ENDEXT                                #  TERMINATE R63
013886,000137: 
013887,000138: 26,2113           06037        ALINEZ             TC       INTPRET                               #  Z AXIS ALIGNMENT
013888,000139: 26,2114           52175                           VLOAD    GOTO                                  
013889,000140: 26,2115           06514                                    UNITZ                                 #  READ (0, 0, .5)
013890,000141: 26,2116           54072                                    V89CALL1                              
013891,000142: 
013892,000143: 26,2117           01014        VB04N12            VN       412                                   
013893,000144: 26,2120           01422        VB06N18            VN       0618                                  

Page 341

013895,000146: 26,2121           00000 13560  DP1MIN             2DEC     6000       B-28                       
013896,000147: 

End of include-file R63.agc.  Parent file is MAIN.agc