Source Code

These source-code files were derived originally from the scan from MIT's Dibner Institute's now-discontinued website titled "History of Recent Science and Technology", which in turn was originally created by Gary Neff, though his high-quality scans were unfortunately reduced in legibility when presented online. The markings on the front of the printout imply that it was the original AGC developer Norm Brodeur's copy. A scan by Ron Burkey has superceded it, made from a more-legible copy from the collection of original AGC developer Fred Martin. The source code was transcribed from those images by Ron Burkey. Note that the page images presented online are of reduced quality, and that higher-quality images are available. Report any conversion errors or legibility problems in page images to info@sandroid.org. Notations on the program listing read, in part:

	ASSEMBLE REVISION 249 OF AGC PROGRAM COLOSSUS BY NASA 2021111-041
	20'35 OCT. 28,1968
Note that the date is the date of the printout, not the date of the program revision.

061302,000002:                                                                                                  ## Copyright:   Public domain.
061303,000003:                                                                                                  ## Filename:    KEYRUPT_UPRUPT.agc
061304,000004:                                                                                                  ## Purpose:     Part of the source code for Colossus, build 249.
061305,000005:                                                                                                  ##              It is part of the source code for the Command Module's (CM)
061306,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), possibly for Apollo 8 and 9.
061307,000007:                                                                                                  ## Assembler:   yaYUL
061308,000008:                                                                                                  ## Reference:   Starts on p. 1439 of 1701.pdf.
061309,000009:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
061310,000010:                                                                                                  ## Website:     www.ibiblio.org/apollo.
061311,000011:                                                                                                  ## Mod history: 08/30/04 RSB.   Adapted from corresponding Luminary131 file.
061312,000012:                                                                                                  ##
061313,000013:                                                                                                  ## The contents of the "Colossus249" files, in general, are transcribed 
061314,000014:                                                                                                  ## from a scanned document obtained from MIT's website,
061315,000015:                                                                                                  ## http://hrst.mit.edu/hrs/apollo/public/archive/1701.pdf.  Notations on this
061316,000016:                                                                                                  ## document read, in part:
061317,000017:                                                                                                  ##
061318,000018:                                                                                                  ##      Assemble revision 249 of AGC program Colossus by NASA
061319,000019:                                                                                                  ##      2021111-041.  October 28, 1968.  
061320,000020:                                                                                                  ##
061321,000021:                                                                                                  ##      This AGC program shall also be referred to as
061322,000022:                                                                                                  ##                              Colossus 1A
061323,000023:                                                                                                  ##
061324,000024:                                                                                                  ##      Prepared by
061325,000025:                                                                                                  ##                      Massachusetts Institute of Technology
061326,000026:                                                                                                  ##                      75 Cambridge Parkway
061327,000027:                                                                                                  ##                      Cambridge, Massachusetts
061328,000028:                                                                                                  ##      under NASA contract NAS 9-4065.
061329,000029:                                                                                                  ##
061330,000030:                                                                                                  ## Refer directly to the online document mentioned above for further information.
061331,000031:                                                                                                  ## Please report any errors (relative to 1701.pdf) to info@sandroid.org.
061332,000032:                                                                                                  ##
061333,000033:                                                                                                  ## In some cases, where the source code for Luminary 131 overlaps that of 
061334,000034:                                                                                                  ## Colossus 249, this code is instead copied from the corresponding Luminary 131
061335,000035:                                                                                                  ## source file, and then is proofed to incorporate any changes.
061336,000036: 

Page 1439

061338,000038: 14,3744                                           BANK     14                                    
061339,000039: 07,2000                                           SETLOC   KEYRUPT                               
061340,000040: 07,2000                                           BANK                                           
061341,000041: 07,3613                                           COUNT*   $$/KEYUP                              
061342,000042: 
061343,000043: 07,3613           54016        KEYRUPT1           TS       BANKRUPT                              
061344,000044: 07,3614           56002                           XCH      Q                                     
061345,000045: 07,3615           54012                           TS       QRUPT                                 
061346,000046: 07,3616           04414                           TC       LODSAMPT                              #  TIME IS SNATCHED IN RUPT FOR NOUN 65.
061347,000047: 07,3617           34362                           CAF      LOW5                                  
061348,000048: 07,3620           00006                           EXTEND                                         
061349,000049: 07,3621           02015                           RAND     MNKEYIN                               #  CHECK IF KEYS 5M-1M ON
061350,000050: 07,3622           54073        KEYCOM             TS       RUPTREG4                              
061351,000051: 07,3623           40101                           CS       FLAGWRD5                              
061352,000052: 07,3624           74674                           MASK     BIT15                                 
061353,000053: 07,3625           26101                           ADS      FLAGWRD5                              
061354,000054: 
061355,000055: 07,3626           34371        ACCEPTUP           CAF      CHRPRIO                               #  (NOTE: RUPTREG4 = KEYTEMP1)
061356,000056: 07,3627           05027                           TC       NOVAC                                 
061357,000057: 07,3630     0777                                  EBANK=   DSPCOUNT                              
061358,000058: 07,3630           02000 60101                     2CADR    CHARIN                                
061359,000059: 
061360,000060: 07,3632           30073                           CA       RUPTREG4                              
061361,000061: 07,3633           50064                           INDEX    LOCCTR                                
061362,000062: 07,3634           54154                           TS       MPAC                                  #  LEAVE 5 BIT KEY CODE IN MPAC FOR CHARIN
061363,000063: 07,3635           05222                           TC       RESUME                                
061364,000064: 

Page 1440

061366,000066:                                                                                                  #  UPRUPT PROGRAM
061367,000067: 
061368,000068: 07,3636           54016        UPRUPT             TS       BANKRUPT                              
061369,000069: 07,3637           56002                           XCH      Q                                     
061370,000070: 07,3640           54012                           TS       QRUPT                                 
061371,000071: 07,3641           04414                           TC       LODSAMPT                              #  TIME IS SNATCHED IN RUPT FOR NOUN 65.
061372,000072: 07,3642           34714                           CAF      ZERO                                  
061373,000073: 07,3643           56045                           XCH      INLINK                                
061374,000074: 07,3644           54073                           TS       KEYTEMP1                              
061375,000075: 07,3645           34710                           CAF      BIT3                                  #  TURN ON UPACT LIGHT
061376,000076: 07,3646           00006                           EXTEND                                         #  (BIT 3 OF CHANNEL 11)
061377,000077: 07,3647           05011                           WOR      DSALMOUT                              
061378,000078: 07,3650           34362        UPRPT1             CAF      LOW5                                  #  TEST FOR TRIPLE CHAR REDUNDANCY
061379,000079: 07,3651           70073                           MASK     KEYTEMP1                              #  LOW5 OF WORD
061380,000080: 07,3652           56073                           XCH      KEYTEMP1                              #  LOW5 INTO KEYTEMP1
061381,000081: 07,3653           00006                           EXTEND                                         
061382,000082: 07,3654           74701                           MP       BIT10                                 #  SHIFT RIGHT 5
061383,000083: 07,3655           54734                           TS       KEYTEMP2                              
061384,000084: 07,3656           74362                           MASK     LOW5                                  #  MID 5
061385,000085: 07,3657           63713                           AD       HI10                                  
061386,000086: 07,3660           03710                           TC       UPTEST                                
061387,000087: 07,3661           34701                           CAF      BIT10                                 
061388,000088: 07,3662           00006                           EXTEND                                         
061389,000089: 07,3663           70734                           MP       KEYTEMP2                              #  SHIFT RIGHT 5
061390,000090: 07,3664           74362                           MASK     LOW5                                  #  HIGH 5
061391,000091: 07,3665           40000                           COM                                            
061392,000092: 07,3666           03710                           TC       UPTEST                                
061393,000093: 
061394,000094: 07,3667           43716        UPCK               CS       ELRCODE                               #  CODE IS GOOD.  IF CODE = `ERROR RESET',
061395,000095: 07,3670           60073                           AD       KEYTEMP1                              #  CLEAR UPLOCKFL (SET BIT4 OF FLAGWRD7 = 0)
061396,000096: 07,3671           00006                           EXTEND                                         #  IF CODE DOES NOT = `ERROR RESET', ACCEPT
061397,000097: 07,3672           13700                           BZF      CLUPLOCK                              #  CODE ONLY IF UPLOCKFL IS CLEAR (=0).
061398,000098: 
061399,000099: 07,3673           34707                           CAF      BIT4                                  #  TEST UPLOCKFL FOR 0 OR 1
061400,000100: 07,3674           70103                           MASK     FLAGWRD7                              
061401,000101: 07,3675           10000                           CCS      A                                     
061402,000102: 07,3676           05222                           TC       RESUME                                #  UPLOCKFL = 1
061403,000103: 07,3677           03626                           TC       ACCEPTUP                              #  UPLOCKFL = 0
061404,000104: 
061405,000105: 07,3700           44707        CLUPLOCK           CS       BIT4                                  #  CLEAR UPLOCKFL (I.E., SET BIT 4 OF
061406,000106: 07,3701           70103                           MASK     FLAGWRD7                              #  FLAGWRD7 = 0)
061407,000107: 07,3702           54103                           TS       FLAGWRD7                              
061408,000108: 07,3703           03626                           TC       ACCEPTUP                              
061409,000109: 
061410,000110:                                                                                                  #  CODE IS BAD
061411,000111: 07,3704           40103        TMFAIL2            CS       FLAGWRD7                              #  LOCK OUT FURTHER UPLINK ACTIVITY
061412,000112: 07,3705           74707                           MASK     BIT4                                  #  (BY SETTING UPLOCKFL = 1) UNTIL
061413,000113: 07,3706           26103                           ADS      FLAGWRD7                              #  `ERROR RESET' IS SENT VIA UPLINK.
061414,000114: 07,3707           05222                           TC       RESUME                                
061415,000115: 07,3710           60073        UPTEST             AD       KEYTEMP1                              

Page 1441

061417,000117: 07,3711           10000                           CCS      A                                     
061418,000118: 07,3712           03704                           TC       TMFAIL2                               
061419,000119: 07,3713           77740        HI10               OCT      77740                                 
061420,000120: 07,3714           03704                           TC       TMFAIL2                               
061421,000121: 07,3715           00002                           TC       Q                                     
061422,000122: 
061423,000123: 07,3716           00022        ELRCODE            OCT      22                                    
061424,000124: 
061425,000125:                                                                                                  #  `UPLINK ACTIVITY LIGHT' IS TURNED OFF BY .....
061426,000126:                                                                                                  #        1.      VBRELDSP
061427,000127:                                                                                                  #        2.      ERROR RESET
061428,000128:                                                                                                  #        3.      UPDATE PROGRAM (P27) ENTERED BY V70,V71,V72, AND V73.
061429,000129: 
061430,000130:                                                                                                  #  THE RECEPTION OF A BAD CODE (I.E., CCC FAILURE) LOCKS OUT FURTHER UPLINK ACTIVITY BY SETTING BIT4 OF FLAGWRD7 = 1.
061431,000131:                                                                                                  #  THIS INDICATION WILL BE TRANSFERRED TO THE GROUND BY THE DOWNLINK WHICH DOWNLINKS ALL FLAGWORDS.
061432,000132:                                                                                                  #  WHEN UPLINK ACTIVITY IS LOCKED OUT, IT CAN BE ALLOWED WHEN THE GROUND UPLINS AND `ERROR RESET' CODE.
061433,000133:                                                                                                  #  (IT IS RECOMMENDED THAT THE `ERROR LIGHT RESET' CODE IS PRECEEDED BY 16 BITS THE FIRST OF WHICH IS 1 FOLLOWED
061434,000134:                                                                                                  #  BY 15 ZEROS.  THIS WILL ELIMINATE EXTRANEOUS BITS FROM INLINK WHICH MAY HAVE BEEN LEFT OVER FROM THE ORIGINAL
061435,000135:                                                                                                  #  FAILURE).
061436,000136: 
061437,000137:                                                                                                  #  UPLINK ACTIVITY IS ALSO ALLOWED (UNLOCKED) DURING FRECH START WHEN FRESH START SETS BIT4 OF FLAGWRD7 = 0.
061438,000138: 
061439,000139: 

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