Source Code

This source code is very close to the Apollo Guidance Computer software for the Apollo 13 Lunar module. This revision of the Luminary 131 program is from December of 1969, whereas there was a later revision in January of 1970, and still another revision in February, which is the code that flew on the mission. As far as this transcription is concerned, it was originally from a copy made in 1991 of a printout from the collection of AGC developer Don Eyles for collector David Craig. It was subsequently scanned by Gary Neff, reprocessed for online presentation at the now-discontinued History of Recent Science and Technology (HRST) website of MIT's Dibner Institute (the full-quality scans being discarded in the process), and finally transcribed by Ron Burkey for the Virtual AGC Project. Although a high-quality replacement scan for a completely illegible page was later provided by Gary Neff, the reduced legibility of the reprocessed HRST posting nevertheless caused many errors to be introduced into the transcription. Accordingly, a second scan of the same physical printout was made in 2017 for the Virtual AGC Project's collection at the Internet Archive, and used to correct the transcription errors. All of the scanned materials mentioned, as well as other Luminary 131 related material, are available online. Don Eyles apprently made additional hand-written notes in printout between 1991 and 2017, so the two scans are not identical in that respect. The page-headings in the printout read, in part:
	GAP:  ASSEMBLE REVISION 131 OF AGC PROGRAM LUMINARY BY NASA 2021112-091
	17:53 DEC. 19, 1969
Note that the date is the date the printout was made, not the date on which the program revision was released, although these happen to be very close together.

045745,000002:                                                                                                  ## Copyright:   Public domain.
045746,000003:                                                                                                  ## Filename:    FIXED_FIXED_CONSTANT_POOL.agc
045747,000004:                                                                                                  ## Purpose:     The main source file for Luminary 1C, revision 131.
045748,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
045749,000006:                                                                                                  ##              Apollo Guidance Computer (AGC) for Apollo 13.
045750,000007:                                                                                                  ## Assembler:   yaYUL
045751,000008:                                                                                                  ## Reference:   pp. 1089-1093
045752,000009:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
045753,000010:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
045754,000011:                                                                                                  ## Mod history: 04/23/03 RSB.   Began.
045755,000012:                                                                                                  ##              05/14/05 RSB    Corrected website reference above.
045756,000013:                                                                                                  ##              2010-10-25 JL   Indentation fixes.
045757,000014:                                                                                                  ##              2017-01-06 RSB  Page numbers now agree with those on the
045758,000015:                                                                                                  ##                              original harcopy, as opposed to the PDF page
045759,000016:                                                                                                  ##                              numbers in 1701.pdf.
045760,000017:                                                                                                  ##              2017-02-27 RSB  Proofed comment text using octopus/ProoferComments.
045761,000018:                                                                                                  ##              2017-03-13 RSB  Comment-text fixes noted in proofing Luminary 116.
045762,000019: 

Page 1089

045764,000021:    4732                                           BLOCK    02                                    
045765,000022:    4732                                           COUNT*   $$/FCONS                              
045766,000023: 
045767,000024:                                                                                                  #  THE FOLLOWING TABLE OF 18 VALUES IS INDEXED.  DO NOT INSERT OR REMOVE ANY QUANTITIES.
045768,000025: 
045769,000026:    4732           37777        DPOSMAX            OCT      37777                                 #  MUST PRECEDE POSMAX
045770,000027:    4733           37777        POSMAX             OCT      37777                                 
045771,000028: 
045772,000029:    4734     4734               LIMITS             =        NEG1/2                                
045773,000030: 
045774,000031:    4734           57777        NEG1/2             OCT      -20000                                #  USED BY SIN ROUTINE (MUST BE TWO 
045775,000032:                                                                                                  #  LOCATIONS IN FRONT OF BIT14)
045776,000033: 
045777,000034:                                                                                                  #  BIT TABLE                                     
045778,000035: 
045779,000036:    4735           40000        BIT15              OCT      40000                                 
045780,000037:    4736           20000        BIT14              OCT      20000                                 
045781,000038:    4737           10000        BIT13              OCT      10000                                 
045782,000039:    4740           04000        BIT12              OCT      04000                                 
045783,000040:    4741           02000        BIT11              OCT      02000                                 
045784,000041:    4742           01000        BIT10              OCT      01000                                 
045785,000042:    4743           00400        BIT9               OCT      00400                                 
045786,000043:    4744           00200        BIT8               OCT      00200                                 
045787,000044:    4745           00100        BIT7               OCT      00100                                 
045788,000045:    4746           00040        BIT6               OCT      00040                                 
045789,000046:    4747           00020        BIT5               OCT      00020                                 
045790,000047:    4750           00010        BIT4               OCT      00010                                 
045791,000048:    4751           00004        BIT3               OCT      00004                                 
045792,000049:    4752           00002        BIT2               OCT      00002                                 
045793,000050:    4753           00001        BIT1               OCT      00001                                 
045794,000051: 
045795,000052:                                                                                                  #  DO NOT DESTROY THIS COMBINATION, SINCE IT IS USED IN DOUBLE PRECISION INSTRUCTIONS.
045796,000053:    4754           77777        NEG0               OCT      -0                                    #  MUST PRECEDE ZERO
045797,000054:    4755           00000        ZERO               OCT      0                                     #  MUST FOLLOW NEG0
045798,000055:                                                                                                  #  BIT1          OCT     00001
045799,000056:                                                                                                  #  NO.WDS        OCT     2               INTERPRETER
045800,000057:                                                                                                  #  OCTAL3        OCT     3               INTERPRETER
045801,000058:                                                                                                  #  R3D1          OCT     4               PINBALL
045802,000059:    4756           00005        FIVE               OCT      5                                     
045803,000060:                                                                                                  #  REVCNT        OCT     6               INTERPRETER
045804,000061:    4757           00007        SEVEN              OCT      7                                     
045805,000062:                                                                                                  #  BIT4          OCT     00010
045806,000063:                                                                                                  #  R2D1          OCT     11              PINBALL
045807,000064:    4760     4320               OCT11              =        R2D1                                  #  P20S
045808,000065:                                                                                                  #  BINCON        DEC     10              PINBALL         (OCTAL 12)
045809,000066:    4760           00013        ELEVEN             DEC      11         B-14                       
045810,000067:                                                                                                  #  OCT14         OCT     14              ALARM AND ABORT (FILLER)
045811,000068:    4761           00015        OCT15              OCT      15                                    
045812,000069:                                                                                                  #  R1D1          OCT     16              PINBALL
045813,000070:    4762           00017        LOW4               OCT      17                                    

Page 1090

045815,000072:                                                                                                  #  BIT5          OCT     00020
045816,000073:                                                                                                  #  ND1           OCT     21              PINBALL
045817,000074:                                                                                                  #  VD1           OCT     23              PINBALL
045818,000075:                                                                                                  #  OCT24         OCT     24              SERVICE ROUTINES
045819,000076:                                                                                                  #  MD1           OCT     25              PINBALL
045820,000077:    4763           00030        BITS4&5            OCT      30                                    
045821,000078:                                                                                                  #  OCT31         OCT     31              SERVICE ROUTINES
045822,000079:    4764           00033        OCT33              OCT      33                                    
045823,000080:    4765     4764               DEC27              =        OCT33                                 
045824,000081:    4765           00035        OCT35              OCT      35                                    
045825,000082:    4766     4765               DEC29              =        OCT35                                 
045826,000083:    4766           00032        CALLCODE           OCT      00032                                 
045827,000084:                                                                                                  #  LOW5          OCT     37              PINBALL
045828,000085:                                                                                                  #  33DEC         DEC     33              PINBALL         (OCTAL 41)
045829,000086:                                                                                                  #  34DEC         DEC     34              PINBALL         (OCTAL 42)
045830,000087:    4767           00045        TBUILDFX           DEC      37         B-14                       #  BUILDUP FOR CONVIENCE IN DAPTESTING
045831,000088:    4770           00046        TDECAYFX           DEC      38         B-14                       #  CONVENIENCE FOR DAPTESTING
045832,000089:                                                                                                  #  BIT6          OCT     00040
045833,000090:    4771           00050        OCT50              OCT      50                                    
045834,000091:    4772           00055        DEC45              DEC      45         B-14                       
045835,000092:    4773           00060        SUPER011           OCT      60                                    #  BITS FOR SUPERBNK SETTING 011.
045836,000093:    4774           00062        .5SEC              DEC      50         B-14                       
045837,000094:                                                                                                  #  BIT7          OCT     00100
045838,000095: 
045839,000096:    4775     4745               SUPER100           =        BIT7                                  #  BITS FOR SUPERBNK SETTING 100
045840,000097:                                                                                                  #  (LAST 4K OF ROPE)
045841,000098:    4775           00120        SUPER101           OCT      120                                   #  BITS FOR SUPERBNK SETTING 101
045842,000099:                                                                                                  #  OCT121        OCT     121             SERVICE ROUTINES
045843,000100:                                                                                                  #  (FIRST 8K OF ACM)
045844,000101:    4776           00140        SUPER110           OCT      140                                   #  BITS FOR SUPERBNK SETTING 110.
045845,000102:                                                                                                  #  (LAST 8K OF ACM)
045846,000103:    4777           00144        1SEC               DEC      100        B-14                       
045847,000104:                                                                                                  #  LOW7          OCT     177             INTERPRETER
045848,000105:                                                                                                  #  BIT8          OCT     00200
045849,000106:                                                                                                  #  OT215         OCT     215             ALARM AND ABORT
045850,000107:                                                                                                  #  8,5           OCT     00220           P20-P25 SUNDANCE
045851,000108:    5000           00310        2SECS              DEC      200        B-14                       
045852,000109:                                                                                                  #  LOW8          OCT     377             PINBALL
045853,000110:                                                                                                  #  BIT9          OCT     00400
045854,000111:    5001           00401        GN/CCODE           OCT      00401                                 #  SET S/C CONTROL SWITCH TO G/N
045855,000112:    5002           00454        3SECS              DEC      300        B-14                       
045856,000113:    5003           00620        4SECS              DEC      400        B-14                       
045857,000114:    5004           00777        LOW9               OCT      777                                   
045858,000115:                                                                                                  #  BIT10         OCT     01000
045859,000116:                                                                                                  #  5.5DEGS       DEC     .03056          P20-P25 SUNDANCE        (OCTAL 00765)
045860,000117:                                                                                                  #  OCT1103       OCT     1103            ALARM AND ABORT
045861,000118:    5005           01124        C5/2               DEC      .0363551                              #                        (OCTAL 01124)
045862,000119:    5006           01211        V05N09             VN       0509                                  #  (SAME AS OCTAL 1211)
045863,000120:    5007           01400        OCT1400            OCT      01400                                 
045864,000121:    5010           01426        V06N22             VN       0622                                  

Page 1091

045866,000123:                                                                                                  #  MID5          OCT     1740            PINBALL
045867,000124:    5011           01776        BITS2-10           OCT      1776                                  
045868,000125:    5012           01777        LOW10              OCT      1777                                  
045869,000126:                                                                                                  #  BIT11         OCT     02000
045870,000127:                                                                                                  #  2K+3          OCT     2003            PINBALL
045871,000128:    5013           02177        LOW7+2K            OCT      2177                                  #  OP CODE MASK + BANK 1 FBANK SETTING.
045872,000129:    5014           02400        EBANK5             OCT      02400                                 
045873,000130:    5015           03000        PRIO3              OCT      03000                                 
045874,000131:    5016           03400        EBANK7             OCT      03400                                 
045875,000132:                                                                                                  #  LOW11         OCT     3777            PINBALL
045876,000133:                                                                                                  #  BIT12         OCT     04000
045877,000134:                                                                                                  #  RELTAB        OCT     04025           T4RUPT
045878,000135:    5017           05000        PRIO5              OCT      05000                                 
045879,000136:    5020           06000        PRIO6              OCT      06000                                 
045880,000137:    5021           07000        PRIO7              OCT      07000                                 
045881,000138: 
045882,000139:                                                                                                  #  BIT13         OCT     10000
045883,000140:                                                                                                  #                OCT     10003           T4RUPT  RELTAB +1D
045884,000141:                                                                                                  #  13,7,2        OCT     10102           P20-P25 SUNDANCE
045885,000142:    5022           11000        PRIO11             OCT      11000                                 
045886,000143:                                                                                                  #  PRIO12        OCT     12000           BANKCALL
045887,000144:    5023           13000        PRIO13             OCT      13000                                 
045888,000145:    5024           14000        PRIO14             OCT      14000                                 
045889,000146:                                                                                                  #                OCT     14031           T4RUPT  RELTAB +2D
045890,000147:    5025           15000        PRIO15             OCT      15000                                 
045891,000148:    5026           16000        PRIO16             OCT      16000                                 
045892,000149:                                                                                                  #  85DEGS        DEC     .45556          P20-P25 SUNDANCE        (OCTAL 16450)
045893,000150:    5027           17000        PRIO17             OCT      17000                                 
045894,000151:    5030           17770        OCT17770           OCT      17770                                 
045895,000152:                                                                                                  #  BIT14         OCT     20000
045896,000153:                                                                                                  #                OCT     20033           T4RUPT  RELTAB +3D
045897,000154:    5031           21000        PRIO21             OCT      21000                                 
045898,000155: 
045899,000156:    7713                                           BLOCK    03                                    
045900,000157:    7713                                           COUNT*   $$/FCONS                              
045901,000158: 
045902,000159:    7713           22000        PRIO22             OCT      22000                                 #  SERVICE ROUTINES
045903,000160:    7714           23000        PRIO23             OCT      23000                                 
045904,000161:    7715           24000        PRIO24             OCT      24000                                 
045905,000162:                                                                                                  #  5/8+1         OCT     24001           SINGLE PRECISION SUBROUTINES
045906,000163:                                                                                                  #                OCT     24017           T4RUPT  RELTAB +4D
045907,000164:    7716           25000        PRIO25             OCT      25000                                 
045908,000165:    7717           26000        PRIO26             OCT      26000                                 
045909,000166:    7720           27000        PRIO27             OCT      27000                                 
045910,000167:                                                                                                  #  CHRPRIO       OCT     30000           PINBALL
045911,000168:                                                                                                  #                OCT     30036           T4RUPT  RELTAB +5D
045912,000169:    7721           31000        PRIO31             OCT      31000                                 
045913,000170:    7722           31103        C1/2               DEC      .7853134                              #                        (OCTAL 31103)
045914,000171:    7723           32000        PRIO32             OCT      32000                                 
045915,000172:    7724           33000        PRIO33             OCT      33000                                 
045916,000173:    7725           34000        PRIO34             OCT      34000                                 
045917,000174:                                                                                                  #                OCT     34034           T4RUPT  RELTAB +6D              

Page 1092

045919,000176:    7726           35000        PRIO35             OCT      35000                                 
045920,000177:    7727           36000        PRIO36             OCT      36000                                 
045921,000178:    7730           37000        PRIO37             OCT      37000                                 
045922,000179:    7731           37401        63/64+1            OCT      37401                                 
045923,000180:                                                                                                  #  MID7          OCT     37600           PINBALL
045924,000181:    7732           37766        OCT37766           OCT      37766                                 
045925,000182:    7733           37774        OCT37774           OCT      37774                                 
045926,000183:    7734           37776        OCT37776           OCT      37776                                 
045927,000184:                                                                                                  #  DPOSMAX       OCT     37777
045928,000185:                                                                                                  #  BIT15         OCT     40000
045929,000186:                                                                                                  #  OCT40001      OCT     40001           INTERPRETER (CS 1 INSTRUCTION)
045930,000187:    7735           40014        DLOADCOD           OCT      40014                                 
045931,000188:    7736           40015        DLOAD*             OCT      40015                                 
045932,000189:                                                                                                  #                OCT     40023           T4RUPT  RELTAB +7D
045933,000190:    7737           40040        BIT15+6            OCT      40040                                 
045934,000191:    7740           40200        OCT40200           OCT      40200                                 
045935,000192:                                                                                                  #                OCT     44035           T4RUPT  RELTAB +8D
045936,000193:                                                                                                  #                OCT     50037           T4RUPT  RELTAB +9D
045937,000194:                                                                                                  #                OCT     54000           T4RUPT  RELTAB +10D
045938,000195:    7741           57777        -BIT14             OCT      57777                                 
045939,000196:                                                                                                  #  RELTAB11      OCT     60000           T4RUPT
045940,000197:    7742           65552        C3/2               DEC      -.3216147                             #                        (OCTAL 65552)
045941,000198:    7743           70000        13,14,15           OCT      70000                                 
045942,000199:    7744           73777        -1/8               OCT      73777                                 
045943,000200:    7745           74000        HIGH4              OCT      74000                                 
045944,000201:    7746           74056        -ENDERAS           DEC      -2001      B-14                       #                        (OCTAL 74056)
045945,000202:                                                                                                  #  HI5           OCT     76000           PINBALL
045946,000203:    7747           77700        HIGH9              OCT      77700                                 
045947,000204:                                                                                                  #  -ENDVAC       DEC     -45             INTERPRETER             (OCTAL 77722)
045948,000205:                                                                                                  #  -OCT10        OCT     -10                                      (OCT 77767)
045949,000206:                                                                                                  #  NEG4          DEC     -4                                      (OCTAL 77773)
045950,000207:    7750           77774        NEG3               DEC      -3         B-14                       
045951,000208:    7751           77775        NEG2               OCT      77775                                 
045952,000209:    7752           77776        NEGONE             DEC      -1         B-14                       
045953,000210: 

Page 1093

045955,000212: 
045956,000213:                                                                                                  #  DEFINED BY EQUALS
045957,000214: 
045958,000215:                                                                                                  #  IT WOULD BE TO THE USERS ADVANTAGE TO OCCASIONALLY CHECK ANY OF THESE SYMBOLS IN ORDER TO PREVENT ANY
045959,000216:                                                                                                  #  ACCIDENTAL DEFINITION CHANGES.
045960,000217: 
045961,000218:    7753     7752               MINUS1             =        NEG1                                  
045962,000219:    7753     7752               NEG1               =        NEGONE                                
045963,000220:    7753     4753               ONE                =        BIT1                                  
045964,000221:    7753     4752               TWO                =        BIT2                                  
045965,000222:    7753     6250               THREE              =        OCTAL3                                
045966,000223:    7753     6250               LOW2               =        THREE                                 
045967,000224:    7753     4751               FOUR               =        BIT3                                  
045968,000225:    7753     6245               SIX                =        REVCNT                                
045969,000226:    7753     4757               LOW3               =        SEVEN                                 
045970,000227:    7753     4750               EIGHT              =        BIT4                                  
045971,000228:    7753     4320               NINE               =        R2D1                                  
045972,000229:    7753     4363               TEN                =        BINCON                                
045973,000230:    7753     4760               NOUTCON            =        ELEVEN                                
045974,000231:    7753     4360               OCT23              =        VD1                                   
045975,000232:    7753     4362               OCT25              =        MD1                                   
045976,000233:    7753     4742               PRIO1              =        BIT10                                 
045977,000234:    7753     5007               EBANK3             =        OCT1400                               
045978,000235:    7753     4741               PRIO2              =        BIT11                                 
045979,000236:    7753     4775               OCT120             =        SUPER101                              
045980,000237:    7753     4776               OCT140             =        SUPER110                              
045981,000238:    7753     4741               2K                 =        BIT11                                 
045982,000239:    7753     4741               EBANK4             =        BIT11                                 
045983,000240:    7753     4740               PRIO4              =        BIT12                                 
045984,000241:    7753     5015               EBANK6             =        PRIO3                                 
045985,000242:    7753     4737               QUARTER            =        BIT13                                 
045986,000243:    7753     4737               PRIO10             =        BIT13                                 
045987,000244:    7753     7666               OCT10001           =        CCSL                                  
045988,000245:    7753     4736               POS1/2             =        HALF                                  
045989,000246:    7753     4736               PRIO20             =        BIT14                                 
045990,000247:    7753     4736               HALF               =        BIT14                                 
045991,000248:    7753     4355               PRIO30             =        CHRPRIO                               
045992,000249:    7753     4355               BIT13-14           =        PRIO30                                #  INTERPRETER USES IN PROCESSING STORECODE
045993,000250:    7753     6474               OCT30002           =        TLOAD      +1                         
045994,000251:    7753     7725               B12T14             =        PRIO34                                
045995,000252:    7753     4735               NEGMAX             =        BIT15                                 
045996,000253:    7753     4735               VLOADCOD           =        BIT15                                 
045997,000254:    7753     6112               VLOAD*             =        OCT40001                              
045998,000255:    7753     4101               OCT60000           =        RELTAB11                              
045999,000256:    7753     4350               BANKMASK           =        HI5                                   
046000,000257: 

End of include-file FIXED-FIXED_CONSTANT_POOL.agc.  Parent file is MAIN.agc