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!

058836,000002:                                                                                                  ## Copyright:   Public domain.
058837,000003:                                                                                                  ## Filename:    RTB_OP_CODES.agc
058838,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary 1A build 099.
058839,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
058840,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 11.
058841,000007:                                                                                                  ## Assembler:   yaYUL
058842,000008:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
058843,000009:                                                                                                  ## Website:     www.ibiblio.org/apollo.
058844,000010:                                                                                                  ## Pages:       1397-1401
058845,000011:                                                                                                  ## Mod history: 2009-05-10 SN   (Sergio Navarro).  Started adapting
058846,000012:                                                                                                  ##                              from the Luminary131/ file of the same
058847,000013:                                                                                                  ##                              name, using Luminary099 page images.
058848,000014:                                                                                                  ##              2016-12-18 RSB  Proofed text comments with octopus/ProoferComments
058849,000015:                                                                                                  ##                              and corrected the errors found.
058850,000016:                                                                                                  ##              2017-03-03 RSB  Snapshot of Luminary 99 Rev 1. 
058851,000017: 

Page 1397

058853,000019: 22,3773                                           BANK     22                                    
058854,000020: 10,2000                                           SETLOC   RTBCODES                              
058855,000021: 10,2000                                           BANK                                           
058856,000022: 
058857,000023: 10,3573  E5,1664                                  EBANK=   XNB                                   
058858,000024: 10,3573                                           COUNT*   $$/RTB                                
058859,000025: 
058860,000026:                                                                                                  #  LOAD TIME2, TIME1 INTO MPAC:
058861,000027: 
058862,000028: 10,3573           00006        LOADTIME           EXTEND                                         
058863,000029: 10,3574           30025                           DCA      TIME2                                 
058864,000030: 10,3575           16055                           TCF      SLOAD2                                
058865,000031: 
058866,000032:                                                                                                  #  CONVERT THE SINGLE PRECISION 2'S COMPLEMENT NUMBER ARRIVING IN MPAC (SCALED IN HALF-REVOLUTIONS) TO A
058867,000033:                                                                                                  #  DP 1'S COMPLEMENT NUMBER SCALED IN REVOLUTIONS.
058868,000034: 
058869,000035: 10,3576           10154        CDULOGIC           CCS      MPAC                                  
058870,000036: 10,3577           34755                           CAF      ZERO                                  
058871,000037: 10,3600           13603                           TCF      +3                                    
058872,000038: 10,3601           13602                           NOOP                                           
058873,000039: 10,3602           44736                           CS       HALF                                  
058874,000040: 
058875,000041: 10,3603           54155                           TS       MPAC       +1                         
058876,000042: 10,3604           34755                           CAF      ZERO                                  
058877,000043: 10,3605           56154                           XCH      MPAC                                  
058878,000044: 10,3606           00006                           EXTEND                                         
058879,000045: 10,3607           74736                           MP       HALF                                  
058880,000046: 10,3610           20155                           DAS      MPAC                                  
058881,000047: 10,3611           16061                           TCF      DANZIG                                #  MODE IS ALREADY AT DOUBLE-PRECISION
058882,000048: 
058883,000049:                                                                                                  #  FORCE TP SIGN AGREEMENT IN MPAC:
058884,000050: 
058885,000051: 10,3612           07257        SGNAGREE           TC       TPAGREE                               
058886,000052: 10,3613           16061                           TCF      DANZIG                                
058887,000053: 
058888,000054:                                                                                                  #  CONVERT THE DP 1'S COMPLEMENT ANGLE SCALED IN REVOLUTIONS TO A SINGLE PRECISION 2'S COMPLEMENT ANGLE
058889,000055:                                                                                                  #  SCALED IN HALF-REVOLUTIONS.
058890,000056: 
058891,000057: 10,3614           03644        1STO2S             TC       1TO2SUB                               
058892,000058: 10,3615           34755                           CAF      ZERO                                  
058893,000059: 10,3616           54155                           TS       MPAC       +1                         
058894,000060: 10,3617           16060                           TCF      NEWMODE                               
058895,000061: 
058896,000062:                                                                                                  #  DO 1STO2S ON A VECTOR OF ANGLES:
058897,000063: 
058898,000064: 10,3620           03644        V1STO2S            TC       1TO2SUB                               #  ANSWER ARRIVES IN A AND MPAC.
058899,000065: 
058900,000066: 10,3621           52162                           DXCH     MPAC       +5                         
058901,000067: 10,3622           52155                           DXCH     MPAC                                  
058902,000068: 10,3623           03644                           TC       1TO2SUB                               

Page 1398

058904,000070: 10,3624           54156                           TS       MPAC       +2                         
058905,000071: 
058906,000072: 10,3625           52160                           DXCH     MPAC       +3                         
058907,000073: 10,3626           52155                           DXCH     MPAC                                  
058908,000074: 10,3627           03644                           TC       1TO2SUB                               
058909,000075: 10,3630           54155                           TS       MPAC       +1                         
058910,000076: 
058911,000077: 10,3631           30161                           CA       MPAC       +5                         
058912,000078: 10,3632           54154                           TS       MPAC                                  
058913,000079: 
058914,000080: 10,3633           34753        TPMODE             CAF      ONE                                   #  MODE IS TP.
058915,000081: 10,3634           16060                           TCF      NEWMODE                               
058916,000082: 
058917,000083:                                                                                                  #  V1STO2S FOR 2 COMPONENT VECTOR. USED BY RR.
058918,000084: 
058919,000085: 10,3635           03644        2V1STO2S           TC       1TO2SUB                               
058920,000086: 10,3636           52160                           DXCH     MPAC       +3                         
058921,000087: 10,3637           52155                           DXCH     MPAC                                  
058922,000088: 10,3640           03644                           TC       1TO2SUB                               
058923,000089: 10,3641           54001                           TS       L                                     
058924,000090: 10,3642           30157                           CA       MPAC       +3                         
058925,000091: 10,3643           16055                           TCF      SLOAD2                                
058926,000092: 
058927,000093:                                                                                                  #  SUBROUTINE TO DO DOUBLING AND 1'S TO 2'S CONVERSION:
058928,000094: 
058929,000095: 10,3644           52155        1TO2SUB            DXCH     MPAC                                  #  FINAL MPAC +1 UNSPECIFIED.
058930,000096: 10,3645           20001                           DDOUBL                                         
058931,000097: 10,3646           10000                           CCS      A                                     
058932,000098: 10,3647           64753                           AD       ONE                                   
058933,000099: 10,3650           13652                           TCF      +2                                    
058934,000100: 10,3651           40000                           COM                                            #  THIS WAS REVERSE OF MSU.
058935,000101: 
058936,000102: 10,3652           54154                           TS       MPAC                                  #  AND SKIP ON OVERFLOW.
058937,000103: 10,3653           00002                           TC       Q                                     
058938,000104: 
058939,000105: 10,3654           50000                           INDEX    A                                     #  OVERFLOW UNCORRECT AND IN MSU.
058940,000106: 10,3655           34734                           CAF      LIMITS                                
058941,000107: 10,3656           26154                           ADS      MPAC                                  
058942,000108: 10,3657           00002                           TC       Q                                     
058943,000109: 
058944,000110:                                                                                                  #  THE FOLLOWING ROUTINE INCREMENTS IN 2S COMPLEMENT THE REGISTER WHOSE ADDRESS IS IN BUF BY THE 1S COMPL.
058945,000111:                                                                                                  #  QUANTITY FOUND IN TEM2.  THIS MAY BE USED TO INCREMENT DESIRED IMU AND OPTICS CDU ANGLES OR ANY OTHER 2S COMPL.
058946,000112:                                                                                                  #  (+0 UNEQUAL TO -0) QUANTITY.  MAY BE CALLED BY BANKCALL/SWCALL.
058947,000113: 
058948,000114: 10,3660           54142        CDUINC             TS       TEM2                                  #  1S COMPL.QUANT. ARRIVES IN ACC.  STORE IT
058949,000115: 10,3661           50130                           INDEX    BUF                                   
058950,000116: 10,3662           10000                           CCS      0                                     #  CHANGE 2S COMPL. ANGLE(IN BUF)INTO 1S
058951,000117: 10,3663           64753                           AD       ONE                                   
058952,000118: 10,3664           13670                           TCF      +4                                    
058953,000119: 10,3665           64753                           AD       ONE                                   

Page 1399

058955,000121: 10,3666           64753                           AD       ONE                                   #  OVERFLOW HERE IF 2S COMPL. IS 180 DEG.
058956,000122: 10,3667           40000                           COM                                            
058957,000123: 
058958,000124: 10,3670           60142                           AD       TEM2                                  #  SULT MOVES FROM 2ND TO 3D QUAD. (OR BACK)
058959,000125: 10,3671           10000                           CCS      A                                     #  BACK TO 2S COMPL.
058960,000126: 10,3672           64753                           AD       ONE                                   
058961,000127: 10,3673           13675                           TCF      +2                                    
058962,000128: 10,3674           40000                           COM                                            
058963,000129: 10,3675           54142                           TS       TEM2                                  #  STORE 14BIT QUANTITY WITH PRESENT SIGN
058964,000130: 10,3676           13702                           TCF      +4                                    
058965,000131: 10,3677           50000                           INDEX    A                                     #  SIGN.
058966,000132: 10,3700           34734                           CAF      LIMITS                                #  FIX IT, BY ADDING IN 37777 OR 40000
058967,000133: 10,3701           60142                           AD       TEM2                                  
058968,000134: 
058969,000135: 10,3702           50130                           INDEX    BUF                                   
058970,000136: 10,3703           54000                           TS       0                                     #  STORE NEW ANGLE IN 2S COMPLEMENT.
058971,000137: 10,3704           00002                           TC       Q                                     
058972,000138: 

Page 1400

058974,000140:                                                                                                  #  RTB TO TORQUE GYROS, EXCEPT FOR THE CALL TO IMUSTALL.  ECADR OF COMMANDS ARRIVES IN X1.
058975,000141: 
058976,000142: 10,3705           50120        PULSEIMU           INDEX    FIXLOC                                #  ADDRESS OF GYRO COMMANDS SHOULD BE IN X1
058977,000143: 10,3706           30046                           CA       X1                                    
058978,000144: 10,3707           04616                           TC       BANKCALL                              
058979,000145: 10,3710           17323                           CADR     IMUPULSE                              
058980,000146: 10,3711           16061                           TCF      DANZIG                                
058981,000147: 

Page 1401

058983,000149:                                                                                                  #  THE SUBROUTINE SIGNMPAC SETS C(MPAC, MPAC +1) TO SIGN(MPAC).
058984,000150:                                                                                                  #  FOR THIS, ONLY THE CONTENTS OF MPAC ARE EXAMINED.  ALSO +0 YIELDS POSMAX AND -0 YIELDS NEGMAX.
058985,000151: 
058986,000152:                                                                                                  #  ENTRY MAY BE BY EITHER OF THE FOLLOWING:
058987,000153:                                                                                                  #        1.      LIMIT THE SIZE OF MPAC ON INTERPRETIVE OVERFLOW:
058988,000154:                                                                                                  #                ENTRY:          BOVB
058989,000155:                                                                                                  #                                        SIGNMPAC
058990,000156:                                                                                                  #        2.      GENERATE IN MPAC THE SIGNUM FUNCTION OF MPAC:
058991,000157:                                                                                                  #                ENTRY:          RTB
058992,000158:                                                                                                  #                                        SIGNMPAC
058993,000159:                                                                                                  #  IN EITHER CASE, RETURN IS TO THE NEXT INTERPRETIVE INSTRUCTION IN THE CALLING SEQUENCE.
058994,000160: 
058995,000161: 10,3712           00006        SIGNMPAC           EXTEND                                         
058996,000162: 10,3713           34733                           DCA      DPOSMAX                               
058997,000163: 10,3714           52155                           DXCH     MPAC                                  
058998,000164: 10,3715           10000                           CCS      A                                     
058999,000165: 10,3716           34755        DPMODE             CAF      ZERO                                  #  SETS MPAC +2 TO ZERO IN THE PROCESS
059000,000166: 10,3717           16057                           TCF      SLOAD2     +2                         
059001,000167: 10,3720           13721                           TCF      +1                                    
059002,000168: 10,3721           00006                           EXTEND                                         
059003,000169: 10,3722           44733                           DCS      DPOSMAX                               
059004,000170: 10,3723           16055                           TCF      SLOAD2                                
059005,000171: 
059006,000172:                                                                                                  #  RTB OP CODE NORMUNIT IS LIKE INTERPRETIVE INSTRUCTION UNIT, EXCEPT THAT IT CAN BE DEPENDED ON NOT TO BLOW
059007,000173:                                                                                                  #  UP WHEN THE VECTOR BEING UNITIZED IS VERY SMALL -- IT WILL BLOW UP WHEN ALL COMPONENTS ARE ZERO.  IF NORMUNIT
059008,000174:                                                                                                  #  IS USED AND THE UPPER ORDER HALVES OF ALL COMPONENTS ARE ZERO, THE MAGNITUDE RETURNED IN 36D WILL BE TOO LARGE
059009,000175:                                                                                                  #  BY A FACTOR OF 2(13) AND THE SQUARED MAGNITUDE RETURNED AT 34D WILL BE TOO BIG BY A FACTOR OF 2(26).
059010,000176: 
059011,000177: 10,3724           34753        NORMUNX1           CAF      ONE                                   
059012,000178: 10,3725           13727                           TCF      NORMUNIT   +1                         
059013,000179: 10,3726           34755        NORMUNIT           CAF      ZERO                                  
059014,000180: 10,3727           60120                           AD       FIXLOC                                
059015,000181: 10,3730           54156                           TS       MPAC       +2                         
059016,000182: 10,3731           04616                           TC       BANKCALL                              #  GET SIGN AGREEMENT IN ALL COMPONENTS
059017,000183: 10,3732           01010                           CADR     VECAGREE                              
059018,000184: 10,3733           10154                           CCS      MPAC                                  
059019,000185: 10,3734           13770                           TCF      NOSHIFT                               
059020,000186: 10,3735           13737                           TCF      +2                                    
059021,000187: 10,3736           13770                           TCF      NOSHIFT                               
059022,000188: 10,3737           10157                           CCS      MPAC       +3                         
059023,000189: 10,3740           13770                           TCF      NOSHIFT                               
059024,000190: 10,3741           13743                           TCF      +2                                    
059025,000191: 10,3742           13770                           TCF      NOSHIFT                               
059026,000192: 10,3743           10161                           CCS      MPAC       +5                         
059027,000193: 10,3744           13770                           TCF      NOSHIFT                               
059028,000194: 10,3745           13747                           TCF      +2                                    
059029,000195: 10,3746           13770                           TCF      NOSHIFT                               

Page 1402

059031,000197: 10,3747           30155                           CA       MPAC       +1                         #  SHIFT ALL COMPONENTS LEFT 13
059032,000198: 10,3750           00006                           EXTEND                                         
059033,000199: 10,3751           74736                           MP       BIT14                                 
059034,000200: 10,3752           20155                           DAS      MPAC                                  #  DAS GAINS A LITTLE ACCURACY
059035,000201: 10,3753           30160                           CA       MPAC       +4                         
059036,000202: 10,3754           00006                           EXTEND                                         
059037,000203: 10,3755           74736                           MP       BIT14                                 
059038,000204: 10,3756           20160                           DAS      MPAC       +3                         
059039,000205: 10,3757           30162                           CA       MPAC       +6                         
059040,000206: 10,3760           00006                           EXTEND                                         
059041,000207: 10,3761           74736                           MP       BIT14                                 
059042,000208: 10,3762           20162                           DAS      MPAC       +5                         
059043,000209: 10,3763           34761                           CAF      THIRTEEN                              
059044,000210: 10,3764           50156                           INDEX    MPAC       +2                         
059045,000211: 10,3765           54045                           TS       37D                                   
059046,000212: 10,3766           04635        OFFTUNIT           TC       POSTJUMP                              
059047,000213: 10,3767           01024                           CADR     UNIT       +1                         #  SKIP THE "TC VECAGREE" DONE AT UNIT
059048,000214: 
059049,000215: 10,3770           34755        NOSHIFT            CAF      ZERO                                  
059050,000216: 10,3771           13764                           TCF      OFFTUNIT   -2                         
059051,000217: 
059052,000218:                                                                                                  #  RTB VECSGNAG ... FORCES SIGN AGREEMENT OF VECTOR IN MPAC.
059053,000219: 
059054,000220: 10,3772           04616        VECSGNAG           TC       BANKCALL                              
059055,000221: 10,3773           01010                           CADR     VECAGREE                              
059056,000222: 10,3774           06061                           TC       DANZIG                                
059057,000223: 
059058,000224: 

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