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!

013750,000002:                                                                                                  ## Copyright:   Public domain.
013751,000003:                                                                                                  ## Filename:    R63.agc
013752,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary 1A build 099.
013753,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
013754,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 11.
013755,000007:                                                                                                  ## Assembler:   yaYUL
013756,000008:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
013757,000009:                                                                                                  ## Website:     www.ibiblio.org/apollo.
013758,000010:                                                                                                  ## Pages:       338-341
013759,000011:                                                                                                  ## Mod history: 2009-05-16 RSB  Adapted from the corresponding 
013760,000012:                                                                                                  ##                              Luminary131 file, using page 
013761,000013:                                                                                                  ##                              images from Luminary 1A.
013762,000014:                                                                                                  ##              2016-12-14 RSB  Proofed text comments with octopus/ProoferComments
013763,000015:                                                                                                  ##                              and corrected the errors found.
013764,000016:                                                                                                  ##              2017-01-26 RSB  Back-ported a comment-text fix from Luminary 69.
013765,000017:                                                                                                  ##              2017-03-03 RSB  Snapshot of Luminary 99 Rev 1. 
013766,000018:                                                                                                  ##              2017-03-07 RSB  Comment-text fixes noted in proofing Luminary 116.
013767,000019: 

Page 338

013769,000021:                                                                                                  #  SUBROUTINE NAME:      V89CALL
013770,000022:                                                                                                  #  MOD NO:       0                       DATE:           9 JAN 1968
013771,000023:                                                                                                  #  MOD BY:       DIGITAL DEVEL GROUP     LOG SECTION:    R63
013772,000024: 
013773,000025:                                                                                                  #  FUNCTIONAL DESCRIPTION:
013774,000026: 
013775,000027:                                                                                                  #  CALLED BY VERB 89 ENTER DURING P00.  PRIO 10 USED.  CALCULATES AND
013776,000028:                                                                                                  #  DISPLAYS FINAL FDAI BALL ANGLES TO POINT LM +X OR +Z AXIS AT CSM.
013777,000029: 
013778,000030:                                                                                                  #  1. KEY IN V 89 E ONLY IF IN PROG 00.  IF NOT IN P00, OPERATOR ERROR AND
013779,000031:                                                                                                  #  EXIT R63, OTHERWISE CONTINUE.
013780,000032: 
013781,000033:                                                                                                  #  2. IF IN P00, DO IMU STATUS CHECK ROUTINE (R02BOTH).  IF IMU ON AND ITS
013782,000034:                                                                                                  #  ORIENTATION KNOWN TO LGC, CONTINUE.
013783,000035: 
013784,000036:                                                                                                  #  3. FLASH DISPLAY V 04 N 06.  R2 INDICATES WHICH SPACECRAFT AXIS IS TO
013785,000037:                                                                                                  #  BE POINTED AT CSM.  INITIAL CHOICE IS PREFERRED (+Z) AXIS (R2=1).
013786,000038:                                                                                                  #  ASTRONAUT CAN CHANGE TO (+X) AXIS (R2 NOT =1) BY V 22 E 2 E.  CONTINUE
013787,000039:                                                                                                  #  AFTER KEYING IN PROCEED.
013788,000040: 
013789,000041:                                                                                                  #  4. BOTH VEHICLE STATE VECTORS UPDATED BY CONIC EQS.
013790,000042: 
013791,000043:                                                                                                  #  5. HALF MAGNITUDE UNIT LOS VECTOR (IN STABLE MEMBER COORDINATES) AND
013792,000044:                                                                                                  #  HALF MAGNITUDE UNIT SPACECRAFT AXIS VECTOR (IN BODY COORDINATES)
013793,000045:                                                                                                  #  PREPARED FOR VECPOINT.
013794,000046: 
013795,000047:                                                                                                  #  6. GIMBAL ANGLES FROM VECPOINT TRANSFORMED INTO FDAI BALL ANGLES BY
013796,000048:                                                                                                  #  BALLANGS.  FLASH DISPLAY V 06 N 18 AND AWAIT RESPONSE.
013797,000049: 
013798,000050:                                                                                                  #  7.    RECYCLE - RETURN TO STEP 4.
013799,000051:                                                                                                  #        TERMINATE - EXIT R63.
013800,000052:                                                                                                  #        PROCEED - RESET 3AXISFLG AND CALL R60LEM FOR ATTITUDE MANEUVER.
013801,000053: 
013802,000054:                                                                                                  #  CALLING SEQUENCE:     V 89 E.
013803,000055: 
013804,000056:                                                                                                  #  SUBROUTINES CALLED:   CHKPOOH, R02BOTH, GOXDSPF, CSMCONIC, LEMCONIC,
013805,000057:                                                                                                  #                        VECPOINT, BALLANGS, R60LEM.
013806,000058: 
013807,000059:                                                                                                  #  NORMAL EXIT MODES:    TC ENDEXT
013808,000060: 
013809,000061:                                                                                                  #  ALARMS:       1. OPERATOR ERROR IF NOT IN P00.
013810,000062:                                                                                                  #                2. PROGRAM ALARM IF IMU IS OFF.
013811,000063:                                                                                                  #                3. PROGRAM ALARM IF IMU ORIENTATION IS UNKNOWN.
013812,000064: 
013813,000065:                                                                                                  #  OUTPUT:       NONE
013814,000066: 
013815,000067:                                                                                                  #  ERASABLE INITIALIZATION REQUIRED:  NONE
013816,000068: 
013817,000069:                                                                                                  #  DEBRIS:       OPTION1, +1, TDEC1, POINTVSM, SCAXIS, CPHI, CTHETA, CPSI,

Page 339

013819,000071:                                                                                                  #                3AXISFLG.
013820,000072: 
013821,000073: 06,3715  E4,1606                                  EBANK=   RONE                                  
013822,000074: 32,2217                                           BANK     32                                    
013823,000075: 26,2000                                           SETLOC   BAWLANGS                              
013824,000076: 26,2000                                           BANK                                           
013825,000077: 
013826,000078: 26,2022                                           COUNT*   $$/R63                                
013827,000079: 26,2022           04616        V89CALL            TC       BANKCALL                              #  IMU STATUS CHECK.  RETURNS IF ORIENTATION
013828,000080: 26,2023           11254                           CADR     R02BOTH                               #  KNOWN.  ALARMS IF NOT.
013829,000081: 26,2024           36245                           CAF      THREE                                 #  ALLOW ASTRONAUT TO SELECT DESIRED
013830,000082: 26,2025           55051                           TS       OPTIONX                               #  TRACKING ATTITUDE AXIS.
013831,000083: 26,2026           34753                           CAF      ONE                                   
013832,000084: 26,2027           55052                           TS       OPTIONX    +1                         
013833,000085: 26,2030           32117                           CAF      VB04N12                               #  V 04 N 12
013834,000086: 26,2031           04616                           TC       BANKCALL                              
013835,000087: 26,2032           20476                           CADR     GOFLASH                               
013836,000088: 26,2033           05472                           TC       ENDEXT                                #  TERMINATE
013837,000089: 26,2034           02036                           TC       +2                                    #  PROCEED
013838,000090: 26,2035           02030                           TC       -5                                    #  DATA IN. OPTION1+1 = 1 FOR Z AXIS
013839,000091: 26,2036           06037        V89RECL            TC       INTPRET                               #                    = 2 FOR X AXIS
013840,000092: 26,2037           43234                           RTB      DAD                                   
013841,000093: 26,2040           21573                                    LOADTIME                              #  READ PRESENT TIME
013842,000094: 26,2041           14122                                    DP1MIN                                
013843,000095: 26,2042           02205                           STORE    TSTART82                              #  SAVE TIME FOR LEMCONIC CALL
013844,000096: 26,2043           34041                           STCALL   TDEC1                                 #  STORE TIME FOR CSMCONIC CALL
013845,000097: 26,2044           27066                                    CSMCONIC                              #  CSM STATE VECTOR UPDATE
013846,000098: 26,2045           77775                           VLOAD                                          #  CSMCONIC LEFT R VECTOR IN RATT
013847,000099: 26,2046           00001                                    RATT                                  
013848,000100: 26,2047           16207                           STODL    RONE                                  #  SAVE FOR LINE OF SIGHT (LOS) COMPUTATION
013849,000101: 26,2050           02205                                    TSTART82                              
013850,000102: 26,2051           34041                           STCALL   TDEC1                                 #  STORE TIME FOR LEMCONIC CALL
013851,000103: 26,2052           27100                                    LEMCONIC                              #  LEM STATE VECTOR UPDATE
013852,000104: 26,2053           52375                           VLOAD    VSU                                   #  CSM POSITION - LEM POSITION = LOS
013853,000105: 26,2054           02207                                    RONE                                  #  LOS VECTOR LEFT IN MPAC
013854,000106: 26,2055           00001                                    RATT                                  
013855,000107: 26,2056           47121                           MXV      RTB                                   #  (REFSMMAT X LOS).  TRANSFORMS LOS FROM
013856,000108: 26,2057           01734                                    REFSMMAT                              #  REFERENCE COORD TO STAB MEMB COORD.
013857,000109: 26,2060           21726                                    NORMUNIT                              
013858,000110: 26,2061           03773                           STORE    POINTVSM                              #  STORE LOS FOR VECPOINT CALL
013859,000111: 26,2062           77776                           EXIT                                           
013860,000112: 26,2063           41052                           CS       OPTIONX    +1                         #  1 FOR Z AXIS.  2 FOR X AXIS.
013861,000113: 26,2064           64753                           AD       ONE                                   
013862,000114: 26,2065           00006                           EXTEND                                         
013863,000115: 26,2066           12113                           BZF      ALINEZ                                
013864,000116: 26,2067           06037        ALINEX             TC       INTPRET                               #  X AXIS ALIGNMENT
013865,000117: 26,2070           77775                           VLOAD                                          
013866,000118: 26,2071           06520                                    UNITX                                 #  READ (.5, 0, 0)

Page 340

013868,000120: 26,2072           37765        V89CALL1           STCALL   SCAXIS                                #  STORE SELECTED ALIGNMENT AXIS
013869,000121: 26,2073           56040                                    VECPOINT                              #  PUTS DESIRED GIM ANG (OG,IG,MG) IN TMPAC
013870,000122: 26,2074           00322                           STORE    CPHI                                  #  STORE GIMBAL ANGLES FOR BALLANGS CALL.
013871,000123: 26,2075           77776                           EXIT                                           
013872,000124: 26,2076           04616                           TC       BANKCALL                              
013873,000125: 26,2077           54266                           CADR     BALLANGS                              #  PUTS DESIRED BALL ANGLES IN FDAIX,Y,Z
013874,000126: 26,2100           32120                           CAF      VB06N18                               #  V 06 N 18
013875,000127: 26,2101           04616                           TC       BANKCALL                              #  NOUN 18 REFERS TO FDAIX,Y,Z
013876,000128: 26,2102           20476                           CADR     GOFLASH                               
013877,000129: 26,2103           05472                           TC       ENDEXT                                #  TERMINATE
013878,000130: 26,2104           02106                           TC       +2                                    #  PROCEED
013879,000131: 26,2105           02036                           TC       V89RECL                               #  RECYCLE
013880,000132: 26,2106           05516                           TC       DOWNFLAG                              #  RESET 3 AXIS FLAG
013881,000133: 26,2107           00124                           ADRES    3AXISFLG                              #  RESET BIT6 FLAG WORD 5
013882,000134: 26,2110           04616                           TC       BANKCALL                              #  PERFORMS LEM MANEUVER TO ALIGN SELECTED
013883,000135: 26,2111           54123                           CADR     R60LEM                                #  SPACECRAFT AXIS TO CSM.
013884,000136: 26,2112           15472                           TCF      ENDEXT                                #  TERMINATE R63
013885,000137: 
013886,000138: 26,2113           06037        ALINEZ             TC       INTPRET                               #  Z AXIS ALIGNMENT
013887,000139: 26,2114           52175                           VLOAD    GOTO                                  
013888,000140: 26,2115           06514                                    UNITZ                                 #  READ (0, 0, .5)
013889,000141: 26,2116           54072                                    V89CALL1                              
013890,000142: 
013891,000143: 26,2117           01014        VB04N12            VN       412                                   
013892,000144: 26,2120           01422        VB06N18            VN       0618                                  

Page 341

013894,000146: 26,2121           00000 13560  DP1MIN             2DEC     6000       B-28                       
013895,000147: 

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