Source Code

These source-code files are part of a reconstructed copy of Comanche 72, the first release of the Apollo Guidance Computer (AGC) Command Module (CM) software for Apollo 13.

They have been adapted from sources files created from a listing of Comanche 55. These source files were updated to match binary dumps of a set of Comanche 67 rope modules. They were then further modified by applying known changes between Comanche 67 and Comanche 72. A binary dump of module B2 of Comanche 72, part number 2010802-021, was also used to validate changes made to banks 05-13. The resulting code assembles to have identical memory-bank checksums as those specified in NASA drawing 2021153G; this gives reasonably high confidence that the changes that have been made are correct. In places where ambiguity exists, this ambiguity is discussed in "## Reconstruction:" comments.

Since no contemporary listings of Comanche 72 are available as source material, all comments and labels are approximate. They have been taken from other AGC programs where possible, or, in some places, written from scratch to match what we believe would have been in the original listing.

050218,000002:                                                                                                  ## Copyright:   Public domain.
050219,000003:                                                                                                  ## Filename:    FIXED-FIXED_CONSTANT_POOL.agc
050220,000004:                                                                                                  ## Purpose:     A section of Comanche revision 072.
050221,000005:                                                                                                  ##              It is part of the reconstructed source code for the first
050222,000006:                                                                                                  ##              release of the software for the Command Module's (CM) Apollo
050223,000007:                                                                                                  ##              Guidance Computer (AGC) for Apollo 13. No original listings
050224,000008:                                                                                                  ##              of this program are available; instead, this file was recreated
050225,000009:                                                                                                  ##              from a printout of Comanche 055, binary dumps of a set of
050226,000010:                                                                                                  ##              Comanche 067 rope modules, and changelogs between Comanche 067
050227,000011:                                                                                                  ##              and 072. It has been adapted such that the resulting bugger words
050228,000012:                                                                                                  ##              exactly match those specified for Comanche 072 in NASA drawing
050229,000013:                                                                                                  ##              2021153G, which gives relatively high confidence that the
050230,000014:                                                                                                  ##              reconstruction is correct.
050231,000015:                                                                                                  ## Assembler:   yaYUL
050232,000016:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
050233,000017:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
050234,000018:                                                                                                  ## Mod history: 2024-05-13 MAS  Created from Comanche 067.
050235,000019: 
050236,000020:    5012                                           BLOCK    02                                    
050237,000021:    5012                                           COUNT    02/FCONS                              
050238,000022: 
050239,000023:                                                                                                  #  THE FOLLOWING TABLE OF 18 VALUES IS INDEXED.  DO NOT INSERT OR REMOVE ANY QUANTITIES.
050240,000024: 
050241,000025:    5012           37777        DPOSMAX            OCT      37777                                 #  MUST PRECEDE POSMAX
050242,000026:    5013           37777        POSMAX             OCT      37777                                 
050243,000027: 
050244,000028:    5014     5014               LIMITS             =        NEG1/2                                
050245,000029: 
050246,000030:    5014           57777        NEG1/2             OCT      -20000                                #  USED BY SIN ROUTINE (MUST BE TWO 
050247,000031:                                                                                                  #  LOCATIONS IN FRONT OF BIT14)
050248,000032: 
050249,000033:                                                                                                  #  BIT TABLE                                     
050250,000034: 
050251,000035:    5015           40000        BIT15              OCT      40000                                 
050252,000036:    5016           20000        BIT14              OCT      20000                                 
050253,000037:    5017           10000        BIT13              OCT      10000                                 
050254,000038:    5020           04000        BIT12              OCT      04000                                 
050255,000039:    5021           02000        BIT11              OCT      02000                                 
050256,000040:    5022           01000        BIT10              OCT      01000                                 
050257,000041:    5023           00400        BIT9               OCT      00400                                 
050258,000042:    5024           00200        BIT8               OCT      00200                                 
050259,000043:    5025           00100        BIT7               OCT      00100                                 
050260,000044:    5026           00040        BIT6               OCT      00040                                 
050261,000045:    5027           00020        BIT5               OCT      00020                                 
050262,000046:    5030           00010        BIT4               OCT      00010                                 
050263,000047:    5031           00004        BIT3               OCT      00004                                 
050264,000048:    5032           00002        BIT2               OCT      00002                                 
050265,000049:    5033           00001        BIT1               OCT      00001                                 
050266,000050: 
050267,000051:                                                                                                  #  DO NOT DESTROY THIS COMBINATION, SINCE IT IS USED IN DOUBLE PRECISION INSTRUCTIONS.
050268,000052:    5034           77777        NEG0               OCT      -0                                    #  MUST PRECEDE ZERO
050269,000053:    5035           00000        ZERO               OCT      0                                     #  MUST FOLLOW NEG0
050270,000054:                                                                                                  #  BIT1          OCT     00001
050271,000055:                                                                                                  #  NO.WDS        OCT     2               INTERPRETER
050272,000056:                                                                                                  #  OCTAL3        OCT     3               INTERPRETER
050273,000057:                                                                                                  #  R3D1          OCT     4               PINBALL
050274,000058:    5036           00005        FIVE               OCT      5                                     
050275,000059:                                                                                                  #  REVCNT        OCT     6               INTERPRETER
050276,000060:    5037           00007        SEVEN              OCT      7                                     
050277,000061:                                                                                                  #  BIT4          OCT     00010
050278,000062:                                                                                                  #  R2D1          OCT     11              PINBALL
050279,000063:    5040     4334               OCT11              =        R2D1                                  #  P20S
050280,000064:                                                                                                  #  BINCON        DEC     10              PINBALL         (OCTAL 12)
050281,000065:    5040           00013        ELEVEN             DEC      11         B-14                       
050282,000066:                                                                                                  #  OCT14         OCT     14              ALARM AND ABORT (FILLER)
050283,000067:    5041           00015        OCT15              OCT      15                                    
050284,000068:                                                                                                  #  R1D1          OCT     16              PINBALL
050285,000069:    5042           00017        LOW4               OCT      17                                    
050286,000070:                                                                                                  #  BIT5          OCT     00020
050287,000071:                                                                                                  #  ND1           OCT     21              PINBALL
050288,000072:                                                                                                  #  VD1           OCT     23              PINBALL
050289,000073:                                                                                                  #  OCT24         OCT     24              SERVICE ROUTINES
050290,000074:                                                                                                  #  MD1           OCT     25              PINBALL
050291,000075:    5043           00030        BITS4&5            OCT      30                                    
050292,000076:                                                                                                  #  OCT31         OCT     31              SERVICE ROUTINES
050293,000077:    5044           00032        CALLCODE           OCT      00032                                 
050294,000078:                                                                                                  #  LOW5          OCT     37              PINBALL
050295,000079:                                                                                                  #  33DEC         DEC     33              PINBALL         (OCTAL 41)
050296,000080:                                                                                                  #  34DEC         DEC     34              PINBALL         (OCTAL 42)
050297,000081:    5045           00045        TBUILDFX           DEC      37         B-14                       #  BUILDUP FOR CONVIENCE IN DAPTESTING
050298,000082:    5046           00046        TDECAYFX           DEC      38         B-14                       #  CONVENIENCE FOR DAPTESTING
050299,000083:                                                                                                  #  BIT6          OCT     00040
050300,000084:    5047           00050        OCT50              OCT      50                                    
050301,000085:    5050           00055        DEC45              DEC      45         B-14                       
050302,000086:    5051           00060        SUPER011           OCT      60                                    #  BITS FOR SUPERBNK SETTING 011.
050303,000087:    5052           00062        .5SEC              DEC      50         B-14                       
050304,000088:                                                                                                  #  BIT7          OCT     00100
050305,000089: 
050306,000090:    5053     5025               SUPER100           =        BIT7                                  #  BITS FOR SUPERBNK SETTING 100
050307,000091:                                                                                                  #  (LAST 4K OF ROPE)
050308,000092:    5053           00120        SUPER101           OCT      120                                   #  BITS FOR SUPERBNK SETTING 101
050309,000093:                                                                                                  #  OCT121        OCT     121             SERVICE ROUTINES
050310,000094:                                                                                                  #  (FIRST 8K OF ACM)
050311,000095:    5054           00140        SUPER110           OCT      140                                   #  BITS FOR SUPERBNK SETTING 110.
050312,000096:                                                                                                  #  (LAST 8K OF ACM)
050313,000097:    5055           00144        1SEC               DEC      100        B-14                       
050314,000098:                                                                                                  #  LOW7          OCT     177             INTERPRETER
050315,000099:                                                                                                  #  BIT8          OCT     00200
050316,000100:                                                                                                  #  OT215         OCT     215             ALARM AND ABORT
050317,000101:                                                                                                  #  8,5           OCT     00220           P20-P25 SUNDANCE
050318,000102:    5056           00310        2SECS              DEC      200        B-14                       
050319,000103:                                                                                                  #  LOW8          OCT     377             PINBALL
050320,000104:                                                                                                  #  BIT9          OCT     00400
050321,000105:    5057           00401        GN/CCODE           OCT      00401                                 #  SET S/C CONTROL SWITCH TO G/N
050322,000106:    5060           00454        3SECS              DEC      300        B-14                       
050323,000107:    5061           00620        4SECS              DEC      400        B-14                       
050324,000108:    5062           00777        LOW9               OCT      777                                   
050325,000109:                                                                                                  #  BIT10         OCT     01000
050326,000110:                                                                                                  #  5.5DEGS       DEC     .03056          P20-P25 SUNDANCE        (OCTAL 00765)
050327,000111:                                                                                                  #  OCT1103       OCT     1103            ALARM AND ABORT
050328,000112:    5063           01124        C5/2               DEC      .0363551                              #                        (OCTAL 01124)
050329,000113:    5064           01211        V05N09             VN       0509                                  #  (SAME AS OCTAL 1211)
050330,000114:    5065           01400        OCT1400            OCT      01400                                 
050331,000115:    5066           01426        V06N22             VN       0622                                  
050332,000116:                                                                                                  #  MID5          OCT     1740            PINBALL
050333,000117:    5067           01776        BITS2-10           OCT      1776                                  
050334,000118:    5070           01777        LOW10              OCT      1777                                  
050335,000119:                                                                                                  #  BIT11         OCT     02000
050336,000120:                                                                                                  #  2K+3          OCT     2003            PINBALL
050337,000121:    5071           02177        LOW7+2K            OCT      2177                                  #  OP CODE MASK + BANK 1 FBANK SETTING.
050338,000122:    5072           02400        EBANK5             OCT      02400                                 
050339,000123:    5073           03000        PRIO3              OCT      03000                                 
050340,000124:    5074           03400        EBANK7             OCT      03400                                 
050341,000125:                                                                                                  #  LOW11         OCT     3777            PINBALL
050342,000126:                                                                                                  #  BIT12         OCT     04000
050343,000127:                                                                                                  #  RELTAB        OCT     04025           T4RUPT
050344,000128:    5075           05000        PRIO5              OCT      05000                                 
050345,000129:    5076           06000        PRIO6              OCT      06000                                 
050346,000130:    5077           07000        PRIO7              OCT      07000                                 
050347,000131: 
050348,000132:                                                                                                  #  BIT13         OCT     10000
050349,000133:                                                                                                  #                OCT     10003           T4RUPT  RELTAB +1D
050350,000134:                                                                                                  #  13,7,2        OCT     10102           P20-P25 SUNDANCE
050351,000135:    5100           11000        PRIO11             OCT      11000                                 
050352,000136:                                                                                                  #  PRIO12        OCT     12000           BANKCALL
050353,000137:    5101           13000        PRIO13             OCT      13000                                 
050354,000138:    5102           14000        PRIO14             OCT      14000                                 
050355,000139:                                                                                                  #                OCT     14031           T4RUPT  RELTAB +2D
050356,000140:    5103           15000        PRIO15             OCT      15000                                 
050357,000141:    5104           16000        PRIO16             OCT      16000                                 
050358,000142:                                                                                                  #  85DEGS        DEC     .45556          P20-P25 SUNDANCE        (OCTAL 16450)
050359,000143:    5105           17000        PRIO17             OCT      17000                                 
050360,000144:    5106           17770        OCT17770           OCT      17770                                 
050361,000145:                                                                                                  #  BIT14         OCT     20000
050362,000146:                                                                                                  #                OCT     20033           T4RUPT  RELTAB +3D
050363,000147:    5107           21000        PRIO21             OCT      21000                                 
050364,000148:    7657                                           BLOCK    03                                    
050365,000149:    7657                                           COUNT    03/FCONS                              
050366,000150: 
050367,000151:    7657           22000        PRIO22             OCT      22000                                 #  SERVICE ROUTINES
050368,000152:    7660           23000        PRIO23             OCT      23000                                 
050369,000153:    7661           24000        PRIO24             OCT      24000                                 
050370,000154:                                                                                                  #  5/8+1         OCT     24001           SINGLE PRECISION SUBROUTINES
050371,000155:                                                                                                  #                OCT     24017           T4RUPT  RELTAB +4D
050372,000156:    7662           25000        PRIO25             OCT      25000                                 
050373,000157:    7663           26000        PRIO26             OCT      26000                                 
050374,000158:    7664           27000        PRIO27             OCT      27000                                 
050375,000159:                                                                                                  #  CHRPRIO       OCT     30000           PINBALL
050376,000160:                                                                                                  #                OCT     30036           T4RUPT  RELTAB +5D
050377,000161:    7665           31000        PRIO31             OCT      31000                                 
050378,000162:    7666           31103        C1/2               DEC      .7853134                              #                        (OCTAL 31103)
050379,000163:    7667           32000        PRIO32             OCT      32000                                 
050380,000164:    7670           33000        PRIO33             OCT      33000                                 
050381,000165:    7671           34000        PRIO34             OCT      34000                                 
050382,000166:                                                                                                  #                OCT     34034           T4RUPT  RELTAB +6D              
050383,000167:    7672           35000        PRIO35             OCT      35000                                 
050384,000168:    7673           36000        PRIO36             OCT      36000                                 
050385,000169:    7674           37000        PRIO37             OCT      37000                                 
050386,000170:    7675           37401        63/64+1            OCT      37401                                 
050387,000171:                                                                                                  #  MID7          OCT     37600           PINBALL
050388,000172:    7676           37766        OCT37766           OCT      37766                                 
050389,000173:    7677           37774        OCT37774           OCT      37774                                 
050390,000174:    7700           37776        OCT37776           OCT      37776                                 
050391,000175:                                                                                                  #  DPOSMAX       OCT     37777
050392,000176:                                                                                                  #  BIT15         OCT     40000
050393,000177:                                                                                                  #  OCT40001      OCT     40001           INTERPRETER (CS 1 INSTRUCTION)
050394,000178:    7701           40014        DLOADCOD           OCT      40014                                 
050395,000179:    7702           40015        DLOAD*             OCT      40015                                 
050396,000180:                                                                                                  #                OCT     40023           T4RUPT  RELTAB +7D
050397,000181:    7703           40040        BIT15+6            OCT      40040                                 
050398,000182:    7704           40200        OCT40200           OCT      40200                                 
050399,000183:                                                                                                  #                OCT     44035           T4RUPT  RELTAB +8D
050400,000184:                                                                                                  #                OCT     50037           T4RUPT  RELTAB +9D
050401,000185:                                                                                                  #                OCT     54000           T4RUPT  RELTAB +10D
050402,000186:    7705           57777        -BIT14             OCT      57777                                 
050403,000187:                                                                                                  #  RELTAB11      OCT     60000           T4RUPT
050404,000188:    7706           65552        C3/2               DEC      -.3216147                             #                        (OCTAL 65552)
050405,000189:    7707           70000        13,14,15           OCT      70000                                 
050406,000190:    7710           73777        -1/8               OCT      73777                                 
050407,000191:    7711           74000        HIGH4              OCT      74000                                 
050408,000192:    7712           74056        -ENDERAS           DEC      -2001      B-14                       #                        (OCTAL 74056)
050409,000193:                                                                                                  #  HI5           OCT     76000           PINBALL
050410,000194:    7713           77700        HIGH9              OCT      77700                                 
050411,000195:                                                                                                  #  -ENDVAC       DEC     -45             INTERPRETER             (OCTAL 77722)
050412,000196:                                                                                                  #  -OCT10        OCT     -10                                      (OCT 77767)
050413,000197:                                                                                                  #  NEG4          DEC     -4                                      (OCTAL 77773)
050414,000198:    7714           77774        NEG3               DEC      -3         B-14                       
050415,000199:    7715           77775        NEG2               OCT      77775                                 
050416,000200:    7716           77776        NEGONE             DEC      -1         B-14                       
050417,000201: 
050418,000202: 
050419,000203:                                                                                                  #  DEFINED BY EQUALS
050420,000204: 
050421,000205:                                                                                                  #  IT WOULD BE TO THE USERS ADVANTAGE TO OCCASIONALLY CHECK ANY OF THESE SYMBOLS IN ORDER TO PREVENT ANY
050422,000206:                                                                                                  #  ACCIDENTAL DEFINITION CHANGES.
050423,000207: 
050424,000208:    7717     7716               MINUS1             =        NEG1                                  
050425,000209:    7717     7716               NEG1               =        NEGONE                                
050426,000210:    7717     5033               ONE                =        BIT1                                  
050427,000211:    7717     5032               TWO                =        BIT2                                  
050428,000212:    7717     6214               THREE              =        OCTAL3                                
050429,000213:    7717     6214               LOW2               =        THREE                                 
050430,000214:    7717     5031               FOUR               =        BIT3                                  
050431,000215:    7717     6211               SIX                =        REVCNT                                
050432,000216:    7717     5037               LOW3               =        SEVEN                                 
050433,000217:    7717     5030               EIGHT              =        BIT4                                  
050434,000218:    7717     4334               NINE               =        R2D1                                  
050435,000219:    7717     4377               TEN                =        BINCON                                
050436,000220:    7717     5040               NOUTCON            =        ELEVEN                                
050437,000221:    7717     4374               OCT23              =        VD1                                   
050438,000222:    7717     4376               OCT25              =        MD1                                   
050439,000223:    7717     5022               PRIO1              =        BIT10                                 
050440,000224:    7717     5065               EBANK3             =        OCT1400                               
050441,000225:    7717     5021               PRIO2              =        BIT11                                 
050442,000226:    7717     5053               OCT120             =        SUPER101                              
050443,000227:    7717     5054               OCT140             =        SUPER110                              
050444,000228:    7717     5021               2K                 =        BIT11                                 
050445,000229:    7717     5021               EBANK4             =        BIT11                                 
050446,000230:    7717     5020               PRIO4              =        BIT12                                 
050447,000231:    7717     5073               EBANK6             =        PRIO3                                 
050448,000232:    7717     5017               QUARTER            =        BIT13                                 
050449,000233:    7717     5017               PRIO10             =        BIT13                                 
050450,000234:    7717     7632               OCT10001           =        CCSL                                  
050451,000235:    7717     5016               POS1/2             =        HALF                                  
050452,000236:    7717     5016               PRIO20             =        BIT14                                 
050453,000237:    7717     5016               HALF               =        BIT14                                 
050454,000238:    7717     4371               PRIO30             =        CHRPRIO                               
050455,000239:    7717     4371               BIT13-14           =        PRIO30                                #  INTERPRETER USES IN PROCESSING STORECODE
050456,000240:    7717     6440               OCT30002           =        TLOAD      +1                         
050457,000241:    7717     7671               B12T14             =        PRIO34                                
050458,000242:    7717     5015               NEGMAX             =        BIT15                                 
050459,000243:    7717     5015               VLOADCOD           =        BIT15                                 
050460,000244:    7717     6056               VLOAD*             =        OCT40001                              
050461,000245:    7717     4105               OCT60000           =        RELTAB11                              
050462,000246:    7717     4364               BANKMASK           =        HI5                                   
050463,000247: 

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