Source Code

These source-code files are part of a reconstructed copy of Luminary 98, a development version 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 memo 85, using asterisks indicating changed lines in the listing as a guide. While no listing of this version is known to exist, nor are the memory-bank checksums available, the reconstruction is believed to be correct because it was an an intermediate step in reconstructing Luminary 97 whose reconstruction was verified by matching memory-bank checksums to those listed in drawing 2021152G. 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 98 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.

029492,000002:                                                                                                  ## Copyright:   Public domain.
029493,000003:                                                                                                  ## Filename:    R31.agc
029494,000004:                                                                                                  ## Purpose:     A section of Luminary revision 98.
029495,000005:                                                                                                  ##              It is part of the reconstructed source code for the a
029496,000006:                                                                                                  ##              development version of the flight software for the Lunar 
029497,000007:                                                                                                  ##              Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
029498,000008:                                                                                                  ##              The code has been recreated from a copy of Luminary 99
029499,000009:                                                                                                  ##              revision 001, using asterisks indicating changed lines in
029500,000010:                                                                                                  ##              the listing and Luminary Memo #85, which lists changes between
029501,000011:                                                                                                  ##              Luminary 98 and 99.
029502,000012:                                                                                                  ## Reference:   pp. 703-708
029503,000013:                                                                                                  ## Assembler:   yaYUL
029504,000014:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
029505,000015:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
029506,000016:                                                                                                  ## Mod history: 2019-07-28 MAS  Created from Luminary 99.
029507,000017: 

Page 703

029509,000019: 40,3674                                           BANK     40                                    
029510,000020: 40,2000                                           SETLOC   R31LOC                                
029511,000021: 40,2000                                           BANK                                           
029512,000022: 
029513,000023: 40,3674                                           COUNT*   $$/R31                                
029514,000024: 
029515,000025: 40,3674           35015        R31CALL            CAF      PRIO3                                 
029516,000026: 40,3675           05105                           TC       FINDVAC                               
029517,000027: 40,3676  E7,1470                                  EBANK=   SUBEXIT                               
029518,000028: 40,3676           03121 76067                     2CADR    V83CALL                               
029519,000029: 
029520,000030: 40,3700           05221        DSPDELAY           TC       FIXDELAY                              
029521,000031: 40,3701           00144                           DEC      100        B-14                       
029522,000032: 40,3702           31044                           CA       EXTVBACT                              
029523,000033: 40,3703           74740                           MASK     BIT12                                 
029524,000034: 40,3704           00006                           EXTEND                                         
029525,000035: 40,3705           13700                           BZF      DSPDELAY                              
029526,000036: 
029527,000037: 40,3706           35017                           CAF      PRIO5                                 
029528,000038: 40,3707           05072                           TC       NOVAC                                 
029529,000039: 40,3710  E7,1611                                  EBANK=   TSTRT                                 
029530,000040: 40,3710           03113 76067                     2CADR    DISPN5X                               
029531,000041: 
029532,000042: 40,3712           15261                           TCF      TASKOVER                              
029533,000043: 
029534,000044: 37,3113                                           BANK     37                                    
029535,000045: 37,2000                                           SETLOC   R31                                   
029536,000046: 37,2000                                           BANK                                           
029537,000047: 37,3113                                           COUNT*   $$/R31                                
029538,000048: 
029539,000049: 37,3113           33407        DISPN5X            CAF      V16N54                                
029540,000050: 37,3114           04616                           TC       BANKCALL                              
029541,000051: 37,3115           20334                           CADR     GOMARKF                               
029542,000052: 37,3116           05563                           TC       B5OFF                                 
029543,000053: 37,3117           05563                           TC       B5OFF                                 
029544,000054: 37,3120           13113                           TCF      DISPN5X                               
029545,000055: 
029546,000056: 37,3121           40103        V83CALL            CS       FLAGWRD7                              #  TEST AVERAGE G FLAG
029547,000057: 37,3122           74747                           MASK     AVEGFBIT                              
029548,000058: 37,3123           00006                           EXTEND                                         
029549,000059: 37,3124           13377                           BZF      MUNG?                                 #  ON - TEST MUNFLAG
029550,000060: 
029551,000061: 37,3125           40104                           CS       FLAGWRD8                              
029552,000062: 37,3126           74744                           MASK     SURFFBIT                              
029553,000063: 37,3127           00006                           EXTEND                                         
029554,000064: 37,3130           13403                           BZF      ONEBASE                               #  ON SURFACE - BYPASS LEMPREC
029555,000065: 
029556,000066: 37,3131           06037                           TC       INTPRET                               #  EXTRAPOLATE BOTH STATE VECTORS
029557,000067: 37,3132           77634                           RTB                                            

Page 704

029559,000069: 37,3133           21573                                    LOADTIME                              
029560,000070: 37,3134           34041                           STCALL   TDEC1                                 
029561,000071: 37,3135           27057                                    LEMPREC                               #  PRECISION BASE VECTOR FOR LM
029562,000072: 37,3136           77775                           VLOAD                                          
029563,000073: 37,3137           00017                                    RATT1                                 
029564,000074: 37,3140           26170                           STOVL    BASETHP                               
029565,000075: 37,3141           00025                                    VATT1                                 
029566,000076: 37,3142           16105                           STODL    BASETHV                               
029567,000077: 37,3143           00015                                    TAT                                   
029568,000078: 37,3144           02114        DOCMBASE           STORE    BASETIME                              #  PRECISION BASE VECTOR FOR CM
029569,000079: 37,3145           34041                           STCALL   TDEC1                                 
029570,000080: 37,3146           27043                                    CSMPREC                               
029571,000081: 37,3147           77775                           VLOAD                                          
029572,000082: 37,3150           00017                                    RATT1                                 
029573,000083: 37,3151           26140                           STOVL    BASEOTP                               
029574,000084: 37,3152           00025                                    VATT1                                 
029575,000085: 37,3153           02120                           STORE    BASEOTV                               
029576,000086: 37,3154           77776                           EXIT                                           
029577,000087: 
029578,000088: 37,3155           40103        REV83              CS       FLAGWRD7                              
029579,000089: 37,3156           74747                           MASK     AVEGFBIT                              
029580,000090: 37,3157           00006                           EXTEND                                         
029581,000091: 37,3160           13326                           BZF      GETRVN                                #  IF AVEGFLAG SET, USE RN,VN
029582,000092: 
029583,000093: 37,3161           40104                           CS       FLAGWRD8                              
029584,000094: 37,3162           74744                           MASK     SURFFBIT                              
029585,000095: 37,3163           00006                           EXTEND                                         
029586,000096: 37,3164           13370                           BZF      R31SURF                               #  IF ON SURFACE, USE LEMAREC
029587,000097: 
029588,000098: 37,3165           06037                           TC       INTPRET                               #  DO CONIC EXTRAPOLATION FOR BOTH VEHICLES
029589,000099: 37,3166           77634                           RTB                                            
029590,000100: 37,3167           21573                                    LOADTIME                              
029591,000101: 37,3170           34041                           STCALL   TDEC1                                 
029592,000102: 37,3171           27414                                    INTSTALL                              
029593,000103: 37,3172           43175                           VLOAD    CLEAR                                 
029594,000104: 37,3173           02170                                    BASETHP                               
029595,000105: 37,3174           00263                                    MOONFLAG                              
029596,000106: 37,3175           25535                           STOVL    RCV                                   
029597,000107: 37,3176           02105                                    BASETHV                               
029598,000108: 37,3177           15543                           STODL    VCV                                   
029599,000109: 37,3200           02114                                    BASETIME                              
029600,000110: 37,3201           43014                           BOF      SET                                   #  GET APPROPRIATE MOONFLAG SETTING
029601,000111: 37,3202           04344                                    MOONTHIS                              
029602,000112: 37,3203           77205                                    +2                                    
029603,000113: 37,3204           00063                                    MOONFLAG                              
029604,000114: 37,3205           77614                           SET                                            
029605,000115: 37,3206           01473                                    INTYPFLG                              #  CONIC EXTRAP.
029606,000116: 37,3207           35517                           STCALL   TET                                   
029607,000117: 37,3210           27107                                    INTEGRVS                              #  INTEGRATION --- AT LAST ---
029608,000118: 37,3211           77775        OTHCONIC           VLOAD                                          

Page 705

029610,000120: 37,3212           00001                                    RATT                                  
029611,000121: 37,3213           26207                           STOVL    RONE                                  
029612,000122: 37,3214           00007                                    VATT                                  
029613,000123: 37,3215           36215                           STCALL   VONE                                  #  GET SET FOR CONIC EXTRAP., OTHER.
029614,000124: 37,3216           27414                                    INTSTALL                              
029615,000125: 37,3217           71214                           SET      DLOAD                                 
029616,000126: 37,3220           01473                                    INTYPFLG                              
029617,000127: 37,3221           00015                                    TAT                                   
029618,000128: 37,3222           00041        OTHINT             STORE    TDEC1                                 
029619,000129: 37,3223           43175                           VLOAD    CLEAR                                 
029620,000130: 37,3224           02140                                    BASEOTP                               
029621,000131: 37,3225           00263                                    MOONFLAG                              
029622,000132: 37,3226           25535                           STOVL    RCV                                   
029623,000133: 37,3227           02120                                    BASEOTV                               
029624,000134: 37,3230           15543                           STODL    VCV                                   
029625,000135: 37,3231           02114                                    BASETIME                              
029626,000136: 37,3232           43014                           BOF      SET                                   
029627,000137: 37,3233           04344                                    MOONTHIS                              
029628,000138: 37,3234           77236                                    +2                                    
029629,000139: 37,3235           00063                                    MOONFLAG                              
029630,000140: 37,3236           35517                           STCALL   TET                                   
029631,000141: 37,3237           27107                                    INTEGRVS                              
029632,000142: 37,3240           52375        COMPDISP           VLOAD    VSU                                   
029633,000143: 37,3241           00001                                    RATT                                  
029634,000144: 37,3242           02207                                    RONE                                  
029635,000145: 37,3243           65234                           RTB      PDDL                                  
029636,000146: 37,3244           21724                                    NORMUNX1                              #  UNIT(RANGE) TO PD 0-5
029637,000147: 37,3245           00045                                    36D                                   
029638,000148: 37,3246           77657                           SL*                                            #  RESCALE AFTER NORMUNIT
029639,000149: 37,3247           20201                                    0,1                                   
029640,000150: 37,3250           26201                           STOVL    RANGE                                 #  SCALED 2(29)M
029641,000151: 37,3251           00007                                    VATT                                  
029642,000152: 37,3252           50251                           VSU      DOT                                   #  (VCM-VLM).UNIT(LOS), PD=0
029643,000153: 37,3253           02215                                    VONE                                  
029644,000154: 37,3254           77752                           SL1                                            #  SCALED 2(7)M/CS
029645,000155: 37,3255           26203                           STOVL    RRATE                                 
029646,000156: 37,3256           02207                                    RONE                                  
029647,000157: 37,3257           63256                           UNIT     PDVL                                  #  UNIT(R) TO PD 0-5
029648,000158: 37,3260           06514                                    UNITZ                                 
029649,000159: 37,3261           77624                           CALL                                           
029650,000160: 37,3262           47661                                    CDU*NBSM                              
029651,000161: 37,3263           41505                           VXM      PUSH                                  #  UNIT(Z)/4 TO PD 6-11
029652,000162: 37,3264           01734                                    REFSMMAT                              
029653,000163: 37,3265           72431                           VPROJ    VSL2                                  #  UNIT(P)=UNIT(UZ-(UZ)PROJ(UR))
029654,000164: 37,3266           00001                                    0D                                    
029655,000165: 37,3267           53445                           BVSU     UNIT                                  
029656,000166: 37,3270           00007                                    6D                                    
029657,000167: 37,3271           47315                           PDVL     VXV                                   #  UNIT(P) TO PD 12-17
029658,000168: 37,3272           00001                                    0D                                    #  UNIT(RL)
029659,000169: 37,3273           02215                                    VONE                                  

Page 706

029661,000171: 37,3274           50235                           VXV      DOT                                   #  (UR * VL) * UR . U(P)
029662,000172: 37,3275           00001                                    0D                                    
029663,000173: 37,3276           00015                                    12D                                   
029664,000174: 37,3277           77715                           PDVL                                           #  SIGN TO 12-13, LOAD U(P)
029665,000175: 37,3300           75241                           DOT      SIGN                                  
029666,000176: 37,3301           00007                                    6D                                    
029667,000177: 37,3302           00015                                    12D                                   
029668,000178: 37,3303           65512                           SL2      ACOS                                  #  ARCCOS(UP.UZ(SIGN))
029669,000179: 37,3304           26205                           STOVL    RTHETA                                
029670,000180: 37,3305           00001                                    0D                                    
029671,000181: 37,3306           51041                           DOT      BPL                                   #  IF UR.UZ NEG,
029672,000182: 37,3307           00007                                    6D                                    #        RTHETA = 1 - RTHETA
029673,000183: 37,3310           77315                                    +5                                    
029674,000184: 37,3311           45345                           DLOAD    DSU                                   
029675,000185: 37,3312           06530                                    DPPOSMAX                              
029676,000186: 37,3313           02205                                    RTHETA                                
029677,000187: 37,3314           02205                           STORE    RTHETA                                
029678,000188: 37,3315           77776                           EXIT                                           
029679,000189: 
029680,000190: 37,3316           34747                           CA       BIT5                                  
029681,000191: 37,3317           71044                           MASK     EXTVBACT                              
029682,000192: 37,3320           00006                           EXTEND                                         #  IF ANSWERED,
029683,000193: 37,3321           15472                           BZF      ENDEXT                                #        TERMINATE
029684,000194: 
029685,000195: 37,3322           41044                           CS       EXTVBACT                              
029686,000196: 37,3323           74740                           MASK     BIT12                                 
029687,000197: 37,3324           27044                           ADS      EXTVBACT                              #  SET BIT 12
029688,000198: 37,3325           13155                           TCF      REV83                                 #  AND START AGAIN.
029689,000199: 
029690,000200: 37,3326           37710        GETRVN             CA       PRIO22                                #  INHIBIT SERVICER
029691,000201: 37,3327           05146                           TC       PRIOCHNG                              
029692,000202: 37,3330           06037                           TC       INTPRET                               
029693,000203: 37,3331           40375                           VLOAD    SETPD                                 
029694,000204: 37,3332           01221                                    RN                                    #  LM STATE VECTOR IN RN,VN
029695,000205: 37,3333           00001                                    0                                     
029696,000206: 37,3334           26207                           STOVL    RONE                                  
029697,000207: 37,3335           01227                                    VN                                    
029698,000208: 37,3336           26215                           STOVL    VONE                                  #  LOAD R(CSM),V(CSM) IN CASE MUNFLAG SET
029699,000209: 37,3337           01726                                    V(CSM)                                #  (TO INSURE TIME COMPATABILITY)
029700,000210: 37,3340           65315                           PDVL     PDDL                                  
029701,000211: 37,3341           01720                                    R(CSM)                                
029702,000212: 37,3342           01235                                    PIPTIME                               
029703,000213: 37,3343           77776                           EXIT                                           
029704,000214: 37,3344           35015                           CA       PRIO3                                 
029705,000215: 37,3345           05146                           TC       PRIOCHNG                              
029706,000216: 37,3346           06037                           TC       INTPRET                               
029707,000217: 37,3347           77214                           BOFF     VLOAD                                 
029708,000218: 37,3350           03347                                    MUNFLAG                               
029709,000219: 37,3351           77363                                    GETRVN2                               #  IF MUNFLAG RESET, DO CM DELTA PRECISION

Page 707

029711,000221: 37,3352           60505                           VXM      VSR4                                  #  CHANGE TO REFERENCE SYSTEM AND RESCALE
029712,000222: 37,3353           01734                                    REFSMMAT                              
029713,000223: 37,3354           77715                           PDVL                                           #  R TO PD 0-5
029714,000224: 37,3355           76505                           VXM      VSL1                                  
029715,000225: 37,3356           01734                                    REFSMMAT                              
029716,000226: 37,3357           40206                           PUSH     SETPD                                 #  V TO PD 5-11
029717,000227: 37,3360           00001                                    0                                     
029718,000228: 37,3361           77650                           GOTO                                           
029719,000229: 37,3362           77240                                    COMPDISP                              
029720,000230: 
029721,000231: 37,3363           77624        GETRVN2            CALL                                           
029722,000232: 37,3364           27414                                    INTSTALL                              
029723,000233: 37,3365           52014                           CLEAR    GOTO                                  
029724,000234: 37,3366           01673                                    INTYPFLG                              #  PREC EXTRAP FOR OTHER
029725,000235: 37,3367           77222                                    OTHINT                                
029726,000236: 37,3370           06037        R31SURF            TC       INTPRET                               
029727,000237: 37,3371           77634                           RTB                                            #  LM IS ON SURFACE, SO PRECISION
029728,000238: 37,3372           21573                                    LOADTIME                              #  INTEGRATION USES PLANETARY INERTIAL
029729,000239: 37,3373           34041                           STCALL   TDEC1                                 #  ORIENTATION SUBROUTINE
029730,000240: 37,3374           27057                                    LEMPREC                               
029731,000241: 37,3375           77650                           GOTO                                           #  DO CSM CONIC
029732,000242: 37,3376           77211                                    OTHCONIC                              
029733,000243: 37,3377           40102        MUNG?              CS       FLAGWRD6                              
029734,000244: 37,3400           74744                           MASK     MUNFLBIT                              
029735,000245: 37,3401           00006                           EXTEND                                         
029736,000246: 37,3402           13326                           BZF      GETRVN                                #  IF MUNFLAG SET, CSM BASE NOT NEEDED
029737,000247: 
029738,000248: 37,3403           06037        ONEBASE            TC       INTPRET                               #  GET CSM BASE VECTOR
029739,000249: 37,3404           52034                           RTB      GOTO                                  
029740,000250: 37,3405           21573                                    LOADTIME                              
029741,000251: 37,3406           77144                                    DOCMBASE                              
029742,000252: 
029743,000253: 37,3407           04066        V16N54             VN       1654                                  
029744,000254: 

Page 708
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029747,000257: 

End of include-file R31.agc.  Parent file is MAIN.agc