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". It is believed that the original listing was preserved by AGC developer Don Eyles, copied/reduced by AGC developer Hugh Blair-Smith, passed by AGC developer James Kernan to collector David Craig, scanned by Gary Neff, and then passed to the Dibner Institute where unfortunately the high-quality scans were reduced in legibility as part of the online-presentation process, and the original scans discarded. The source code was transcribed from those images by Ron Burkey. The images from the Dibner Institute website, and unfortunately not the discarded original high-quality scans, though with a few high-quality replacement scans provided directly by Gary Neff, are now available at the Virtual AGC project website. Report any conversion errors to info@sandroid.org. Notations on the program listing 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 of the printout, not the date of the program revision.

041598,000002:                                                                                                  ## Copyright:   Public domain.
041599,000003:                                                                                                  ## Filename:    DOWN_TELEMETRY_PROGRAM.agc
041600,000004:                                                                                                  ## Purpose:     A section of Luminary 1C, revision 131.
041601,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
041602,000006:                                                                                                  ##              Apollo Guidance Computer (AGC) for Apollo 13 and Apollo 14.
041603,000007:                                                                                                  ##              This file is intended to be a faithful transcription, except
041604,000008:                                                                                                  ##              that the code format has been changed to conform to the
041605,000009:                                                                                                  ##              requirements of the yaYUL assembler rather than the
041606,000010:                                                                                                  ##              original YUL assembler.
041607,000011:                                                                                                  ## Reference:   pp. 987-998 of 1729.pdf.
041608,000012:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
041609,000013:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
041610,000014:                                                                                                  ## Mod history: 05/29/03 RSB.   Began transcribing.
041611,000015:                                                                                                  ##              05/14/05 RSB    Corrected website reference above.
041612,000016:                                                                                                  ##              2010-08-24 JL   Fixed page 995 number.
041613,000017:                                                                                                  ##              2010-10-25 JL   Indentation fixes.
041614,000018: 

Page 987

041616,000020:                                                                                                  #  PROGRAM NAME -- DOWN TELEMETRY PROGRAM
041617,000021:                                                                                                  #  MOD NO. -- 0          TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
041618,000022:                                                                                                  #                        PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
041619,000023:                                                                                                  #                        THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS.  REFER TO DOWNLINK
041620,000024:                                                                                                  #                        LISTS LOG SECTION FOR MORE DETAILS.  HOWEVER THIS CHANGES WILL NOT AFFECT THE GROUND PROCESSING
041621,000025:                                                                                                  #                        OF DOWN TELEMETRY DATA.
041622,000026:                                                                                                  #  MOD BY -- KILROY, SMITH, DEWITT
041623,000027:                                                                                                  #  DATE -- 02 OCT 67
041624,000028:                                                                                                  #  AUTHORS -- KILROY, SMITH, DWWITT, DEWOLF, FAGIN
041625,000029:                                                                                                  #  LOG SECTION -- DOWN-TELEMETRY PROGRAM
041626,000030: 
041627,000031:                                                                                                  #  FUNCTIONAL DESCRIPTION -- THIS ROUTINE IS INITIATED BY TELEMETRY END
041628,000032:                                                                                                  #        PULSE FROM THE DOWNLINK TELEMETRY CONVERTER.  THIS PULSE OCCURS
041629,000033:                                                                                                  #        AT 50 TIMES PER SEC (EVERY 20 MS) THEREFORE DODOWNTM IS
041630,000034:                                                                                                  #        EXECUTED AT THESE RATES.  THIS ROUTINE SELECTS THE APPROPRIATE
041631,000035:                                                                                                  #        AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
041632,000036:                                                                                                  #        CHANNELS 34 AND 35.  THE INFORMATION IS THEN GATED OUT FROM THE
041633,000037:                                                                                                  #        LGC IN SERIAL FASHION.
041634,000038: 
041635,000039:                                                                                                  #        THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST.  SINCE DOWNRUPTS
041636,000040:                                                                                                  #        OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
041637,000041:                                                                                                  #        CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
041638,000042:                                                                                                  #        OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
041639,000043: 
041640,000044:                                                                                                  #  CALLING SEQUENCE -- NONE
041641,000045:                                                                                                  #        PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
041642,000046:                                                                                                  #        RESULT OF A DOWNRUPT.  CONTROL IS RETURNED VIA TCF RESUME WHICH
041643,000047:                                                                                                  #        IN EFFECT IS A RESUME.
041644,000048: 
041645,000049:                                                                                                  #  SUBROUTINES CALLED -- NONE
041646,000050: 
041647,000051:                                                                                                  #  NORMAL EXIT MODE -- TCF RESUME
041648,000052: 
041649,000053:                                                                                                  #  ALARM OR ABORT EXIT MODE -- NONE
041650,000054: 
041651,000055:                                                                                                  #  RESTART PROTECTION:
041652,000056:                                                                                                  #        ON A FRESH START AND RESTART THE `STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER (ACTUALLY
041653,000057:                                                                                                  #        DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST (I.E., CURRENT CONTENTS OF DNLSTADR).  THIS HAS THE
041654,000058:                                                                                                  #        EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
041655,000059:                                                                                                  #        THE RESTART (OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
041656,000060:                                                                                                  #        DOWNLIST.
041657,000061: 
041658,000062:                                                                                                  #        ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
041659,000063: 
041660,000064:                                                                                                  #  DOWNLINK LIST SELECTION:
041661,000065:                                                                                                  #        THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
041662,000066:                                                                                                  #        1.      FRESH START
041663,000067:                                                                                                  #        2.      V37EXXE WHERE XX = THE MAJOR MODE BEING SELECTED.
041664,000068:                                                                                                  #        3.      UPDATE PROGRAM (P27)
041665,000069:                                                                                                  #        4.      NON-V37 SELECTABLE TYPE PROGRAMS (E.G., AGS INITIALIZATION (SUNDANCE, LUMINARY) AND P61-P62
041666,000070:                                                                                                  #                TRANSITIONS (COLOSSUS) ETC.).
041667,000071: 
041668,000072:                                                                                                  #  DOWNLINK LIST RULES AND LIMITATIONS:
041669,000073:                                                                                                  #        READ SECTION(S) WHICH FOLLOW `DEBRIS' WRITEUP.
041670,000074: 
041671,000075:                                                                                                  #  OUTPUT -- EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS (I.E., 200 LGC
041672,000076:                                                                                                  #        COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
041673,000077: 
041674,000078:                                                                                                  #  ERASABLE INITIALIZATION REQUIRED -- NONE
041675,000079:                                                                                                  #        `DNTMGOTO' AND `DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
041676,000080: 
041677,000081:                                                                                                  #  DEBRIS (ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM) --
041678,000082:                                                                                                  #        LDATALST, DNTMBUFF TO DNTMBUFF +21D, TMINDEX, DNQ.

Page 988

041680,000084:                                                                                                  #  (No source on this page of the original assembly listing.)
041681,000085: 

Page 989

041683,000087:                                                                                                  #  DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
041684,000088:                                                                                                  #  RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
041685,000089: 
041686,000090:                                                                                                  #  NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
041687,000091:                                                                                                  #  1.    DOWNLISTS.  DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
041688,000092:                                                                                                  #        DOWN-TELEMETRY PROGRAM.  THIS IS DONE FOR EASE OF CODING, FASTER
041689,000093:                                                                                                  #        EXECUTION.
041690,000094:                                                                                                  #  2.    EACH DOWNLINK LIST CONSISTES OF A CONTROL LIST AND A NUMBER OF
041691,000095:                                                                                                  #        SUBLISTS.
041692,000096:                                                                                                  #  3.    A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
041693,000097:                                                                                                  #        DOWNLINK LISTS.  ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
041694,000098:                                                                                                  #        CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
041695,000099:                                                                                                  #  4.    SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENEOUS DATA WHICH MUST BE
041696,000100:                                                                                                  #        SAVED IN A BUFFER DURING ONE DOWNRUPT.
041697,000101:                                                                                                  #  5.    THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
041698,000102:                                                                                                  #        OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
041699,000103:                                                                                                  #        IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
041700,000104:                                                                                                  #  6.    ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
041701,000105:                                                                                                  #        CREATED FOR THE DOWNLIST PROGRAM.
041702,000106:                                                                                                  #        A.      1DNADR                  1-WORD DOWNLIST ADDRESS.
041703,000107:                                                                                                  #                SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
041704,000108:                                                                                                  #                HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
041705,000109:                                                                                                  #        B.      2DNADR - 6DNADR         N-WORD DOWNLIST ADDRESS, N = 2 - 6.
041706,000110:                                                                                                  #                SAME AS 1DNADR, BUT WTIH THE 4 UNUSED BITS OF THE ECADR FORMAT
041707,000111:                                                                                                  #                FILLED IN WITH 0001-0101.  USED TO POINT TO A LIST OF N DOUBLE-
041708,000112:                                                                                                  #                PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
041709,000113:                                                                                                  #        C.      DNCHAN                  DOWNLIST CHANNEL ADDRESS.
041710,000114:                                                                                                  #                SAME AS 1DNADR, BUT WITH PREFIX BITS 0111.  USED TO POINT TO
041711,000115:                                                                                                  #                A PAIR OF CHANNELS FOR DOWN TELEMETRY.
041712,000116:                                                                                                  #        D.      DNPTR                   DOWN-TELEMETRY SUBLIST POINTER.
041713,000117:                                                                                                  #                SAME AS CAF BUT TAGGES AS A CONSTANT.  USED IN CONTROL LIST TO POINT TO A SUBLIST.
041714,000118:                                                                                                  #                CAUTION --- A DNPTR CANNOT BE USED IN A SUBLIST.
041715,000119:                                                                                                  #  7.    THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E., CONTROL LIST) AND WHEN
041716,000120:                                                                                                  #        A `1DNADR TIME2' IS DETECTED IN THE CONTROL LIST (ONLY).
041717,000121:                                                                                                  #  8.    IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
041718,000122: 
041719,000123:                                                                                                  #  DOWNLIST LIST RESTRICTIONS:
041720,000124:                                                                                                  #  (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO IT IS CLEAR THAT THESE THINGS CANNOT BE
041721,000125:                                                                                                  #  DONE)
041722,000126:                                                                                                  #  1.    SNAPSHOT DOWNLIST:
041723,000127:                                                                                                  #        (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E., 1DNADR'S): Q, 400, 1000, 1400, 2000, 2400, 3000, 3400.
041724,000128:                                                                                                  #        (B) CAN CONTAIN ONLY 1DNADR'S
041725,000129:                                                                                                  #  2.    ALL DOWNLINKED DATA (EXCEPT CHANNELS) IS PICKED UP BY A DCA SO DOWNLINK LISTS CANNOT CONTAIN THE
041726,000130:                                                                                                  #        EQUIVALENT OF THE FOLLOWING ECADRS (I.E., IDNADRS): 377, 777, 1377, 1777, 2377, 2777, 3377, 3777.
041727,000131:                                                                                                  #        (NOTE: TE TERM `EQUIVALENT' MEANT THAT THE IDNADR TO 6DNADR WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
041728,000132:                                                                                                  #  3.    CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777

Page 990

041730,000134:                                                                                                  #  4.    THE `1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINT PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
041731,000135:                                                                                                  #        CONTROL SECTION OF THE DOWNLIST.
041732,000136:                                                                                                  #  5.    `DNCHAN 0' CANNOT BE USED.
041733,000137:                                                                                                  #  6.    `DNPTR 0' CANNOT BE USED.
041734,000138:                                                                                                  #  7.    DNPTR CANNOT APPEAR IN A SUBLIST.
041735,000139: 
041736,000140:                                                                                                  #  EBANK SETTINGS
041737,000141:                                                                                                  #        IN THE PROCESS OF SETTING THE EBANK (WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
041738,000142:                                                                                                  #        `GARBAGE' INTO BITS15-12 OF EBANK.  HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
041739,000143:                                                                                                  #        SIGNIFICANT SOMEDAY IN THE FUTURE.  IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE (BY MASKING ETC.)
041740,000144:                                                                                                  #        THAT BITS 15-12 OF EBANK ARE ZERO.
041741,000145: 
041742,000146:                                                                                                  #  INITIALIZATION REQUIRED -- TO INTERRUPT CURRENT LIST AND START A NEW ONE.
041743,000147:                                                                                                  #        1. ADRES OF DOWNLINK LIST INTO DNLSTADR
041744,000148:                                                                                                  #        2. NEGONE INTO SUBLIST
041745,000149:                                                                                                  #        3. NEGONE INTO DNECADR
041746,000150: 
041747,000151: 22,3711                                           BANK     22                                    
041748,000152: 05,2000                                           SETLOC   DOWNTELM                              
041749,000153: 05,2000                                           BANK                                           
041750,000154: 
041751,000155: 05,3505     0340                                  EBANK=   DNTMBUFF                              
041752,000156: 05,3505                                           COUNT*   $$/DPROG                              
041753,000157: 05,3505           54016        DODOWNTM           TS       BANKRUPT                              
041754,000158: 05,3506           00006                           EXTEND                                         
041755,000159: 05,3507           22012                           QXCH     QRUPT                                 #  SAVE Q
041756,000160: 05,3510           34745                           CA       BIT7                                  #  AT THE BEGINNING OF THE LIST THE WORD
041757,000161: 05,3511           00006                           EXTEND                                         #  ORDER BIT WILL BE SET BACK TO ZERO.
041758,000162: 05,3512           02013                           RAND     CHAN13                                
041759,000163: 05,3513           10000                           CCS      A                                     
041760,000164: 05,3514           00335                           TC       DNTMGOTO                              
041761,000165: 05,3515           06022                           TC       C13STALL                              
041762,000166: 05,3516           34745                           CA       BIT7                                  
041763,000167: 05,3517           00006                           EXTEND                                         #  SET WORD ORDER BIT TO 1 ONLY IF IT
041764,000168: 05,3520           05013                           WOR      CHAN13                                #  ALREADY ISN'T
041765,000169: 05,3521           00335                           TC       DNTMGOTO                              #  GOTO APPROPRIATE PHASE OF PROGRAM
041766,000170: 
041767,000171: 05,2000                                           SETLOC   DOWNTELM                              
041768,000172: 05,2000                                           BANK                                           
041769,000173: 
041770,000174: 05,3522           37752        DNPHASE1           CA       NEGONE                                #  INITIALIZE ALL CONTROL WORDS
041771,000175: 05,3523           54337                           TS       SUBLIST                               #  WORDS TO MINUS ONE
041772,000176: 05,3524           54336                           TS       DNECADR                               
041773,000177: 05,3525           33652                           CA       LDNPHAS2                              #  SET DNTMGOTO = 0 ALL SUSEQUENT DOWRUPTS

Page 991

041775,000179: 05,3526           54335                           TS       DNTMGOTO                              #  GO TO DNPHASE2
041776,000180: 05,3527           13543                           TCF      NEWLIST                               
041777,000181: 05,3530           10336        DNPHASE2           CCS      DNECADR                               #  SENDING OF DATA IN PROGRESS
041778,000182: 05,3531           03665        DODNADR            TC       FETCH2WD                              #  YES -- THEN FETCH THE NEXT 2 SP WORDS
041779,000183: 05,3532           77753        MINTIME2           -1DNADR  TIME2                                 #  NEGATIVE OF TIME2 1DNADR
041780,000184: 05,3533           13534                           TCF      +1                                    #  (ECADR OF 3776 + 74001 = 77777)
041781,000185: 
041782,000186: 05,3534           10337                           CCS      SUBLIST                               #  IS THE SUBLIST IN CONTROL
041783,000187: 05,3535           13700                           TCF      NEXTINSL                              #  YES
041784,000188: 05,3536           74001        DNADRDCR           OCT      74001                                 #  DNADR COUNT AND ECADR DECREMENTER
041785,000189: 
041786,000190: 05,3537           30334        CHKLIST            CA       CTLIST                                
041787,000191: 05,3540           00006                           EXTEND                                         
041788,000192: 05,3541           63543                           BZMF     NEWLIST                               #  IT WILL BE NEGATIVE AT END OF LIST
041789,000193: 05,3542           13550                           TCF      NEXTINCL                              
041790,000194: 05,3543           50333        NEWLIST            INDEX    DNLSTCOD                              
041791,000195: 05,3544           32441                           CA       DNTABLE                               #  INITIALIZE CTLIST WITH
041792,000196: 05,3545           54334                           TS       CTLIST                                #        STARTING ADDRESS OF NEW LIST
041793,000197: 05,3546           40333                           CS       DNLSTCOD                              
041794,000198: 05,3547           13767                           TCF      SENDID     +3                         
041795,000199: 05,3550           50334        NEXTINCL           INDEX    CTLIST                                
041796,000200: 05,3551           30000                           CA       0                                     
041797,000201: 05,3552           10000                           CCS      A                                     
041798,000202: 05,3553           24334                           INCR     CTLIST                                #  SET POINTER TO PICK UP NEXT CTLIST WORD
041799,000203: 05,3554           13560                           TCF      +4                                    #  ON NEXT ENTRY TO PROG.  (A SHOULD NOT =0)
041800,000204: 05,3555           56334                           XCH      CTLIST                                #  SET CTLIST TO NEGATIVE AND PLACE(CODING)
041801,000205: 05,3556           40000                           COM                                            #  UNCOMPLEMENTED DNADR INTO A.    (FOR LA)
041802,000206: 05,3557           56334                           XCH      CTLIST                                #                                  (ST IN )
041803,000207: 05,3560           24000                 +4        INCR     A                                     #                                  (CTLIST)
041804,000208: 05,3561           54336                           TS       DNECADR                               #  SAVE DNADR
041805,000209: 05,3562           63532                           AD       MINTIME2                              #  TEST FOR TIME2 (NEG. OF ECADR)
041806,000210: 05,3563           10000                           CCS      A                                     
041807,000211: 05,3564           13570                           TCF      SETWO      +1                         #  DON'T SET WORD ORDER CODE
041808,000212: 05,3565           47777        MINB1314           OCT      47777                                 #  MINUS BIT 13 AND 14 (CAN'T GET HERE)
041809,000213: 05,3566           13570                           TCF      SETWO      +1                         #  DON'T SET WORD ORDER CODE
041810,000214: 05,3567           03612        SETWO              TC       WOZERO                                #  GO SET WORD ORDER CODE TO ZERO.
041811,000215: 05,3570           30336                 +1        CA       DNECADR                               #  RELOAD A WITH THE DNADR.
041812,000216: 05,3571           63565                 +2        AD       MINB1314                              #  IS THIS A REGULAR DNADR?
041813,000217: 05,3572           00006                           EXTEND                                         
041814,000218: 05,3573           63665                           BZMF     FETCH2WD                              #  YES.  (A MUST NEVER BE ZERO)
041815,000219: 05,3574           67744                           AD       MINB12                                #  NO.  IS IT A POINTER (DNPTR) OR A
041816,000220: 05,3575           00006                           EXTEND                                         #        CHANNEL(DNCHAN)
041817,000221: 05,3576           63623                           BZMF     DODNPTR                               #  IT'S A POINTER.  (A MUST NEVER BE ZERO)
041818,000222: 
041819,000223: 05,3577           00006        DODNCHAN           TC       6                                     #  (EXECUTED AS EXTEND)  IT'S A CHANNEL
041820,000224: 05,3600           50336                           INDEX    DNECADR                               
041821,000225: 05,3601           44000                           INDEX    0          -4000                      #  (EXECUTED AS READ)
041822,000226: 05,3602           54001                           TS       L                                     
041823,000227: 05,3603           00006                           TC       6                                     #  (EXECUTED AS EXTEND)
041824,000228: 05,3604           50336                           INDEX    DNECADR                               

Page 992

041826,000230: 05,3605           43777                           INDEX    0          -4001                      #  (EXECUTED AS READ)
041827,000231: 05,3606           54336                           TS       DNECADR                               #  SET DNECADR
041828,000232: 05,3607           37752                           CA       NEGONE                                #        TO MINUS
041829,000233: 05,3610           56336                           XCH      DNECADR                               #                WHILE PRESERVING A.
041830,000234: 05,3611           13713                           TCF      DNTMEXIT                              #  GO SEND CHANNELS
041831,000235: 
041832,000236: 05,3612           00006        WOZERO             EXTEND                                         
041833,000237: 05,3613           23265                           QXCH     C13QSAV                               
041834,000238: 05,3614           22070                           LXCH     RUPTREG1                              
041835,000239: 05,3615           06022                           TC       C13STALL                              
041836,000240: 
041837,000241: 05,3616           22070                           LXCH     RUPTREG1                              
041838,000242: 05,3617           44745                           CS       BIT7                                  
041839,000243: 05,3620           00006                           EXTEND                                         
041840,000244: 05,3621           03013                           WAND     CHAN13                                #  SET WORD ORDER CODE TO ZERO
041841,000245: 05,3622           01265                           TC       C13QSAV                               
041842,000246: 
041843,000247: 05,3623           50336        DODNPTR            INDEX    DNECADR                               #  DNECADR CONTAINS ADRES OF SUBLIST
041844,000248: 05,3624           00000                           0        0                                     #  CLEAR AND ADD LIST ENTRY INTO A.
041845,000249: 05,3625           10000                           CCS      A                                     #  IS THIS A SNAPSHOT SUBLIST
041846,000250: 05,3626           30336                           CA       DNECADR                               #  NO, IT IS A REGULAR SUBLIST.
041847,000251: 05,3627           13677                           TCF      DOSUBLST                              #  A MUST NOT BE ZERO.
041848,000252: 
041849,000253: 05,3630           56336                           XCH      DNECADR                               #  YES.  IT IS A SNAPSHOT SUBLIST.
041850,000254: 05,3631           54337                           TS       SUBLIST                               #  C(DNECADR) INTO SUBLIST
041851,000255: 05,3632           34755                           CAF      ZERO                                  #        A    INTO     A
041852,000256: 05,3633           56336                           XCH      TMINDEX                               #  (NOTE:  TMINDEX = DNECADR)
041853,000257: 
041854,000258:                                                                                                  #  THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND) IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
041855,000259:                                                                                                  #  THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
041856,000260:                                                                                                  #  THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
041857,000261:                                                                                                  #  TO MINIMIZE TIME.  THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
041858,000262:                                                                                                  #  THESE RULES ARE ......
041859,000263:                                                                                                  #        1.      ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
041860,000264:                                                                                                  #        2.      THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY BANK.
041861,000265: 
041862,000266: 05,3634           54003        SNAPLOOP           TS       EBANK                                 #  SET EBANK
041863,000267: 05,3635           74357                           MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS
041864,000268: 05,3636           00006                           EXTEND                                         
041865,000269: 05,3637           50000                           INDEX    A                                     
041866,000270: 05,3640  E3,1401                                  EBANK=   1401                                  
041867,000271: 05,3640           31402                           DCA      1401                                  #  PICK UP 2 SNAPSHOT WORDS.
041868,000272: 05,3641     0340                                  EBANK=   DNTMBUFF                              
041869,000273: 05,3641           50336                           INDEX    TMINDEX                               
041870,000274: 05,3642           52341                           DXCH     DNTMBUFF                              #  STORE 2 SNAPSHOT WORDS IN BUFFER
041871,000275: 05,3643           24336                           INCR     TMINDEX                               #  SET BUFFER INDEX FOR NEXT 2 WORDS.
041872,000276: 05,3644           24336                           INCR     TMINDEX                               
041873,000277: 05,3645           24337        SNAPAGN            INCR     SUBLIST                               #  SET POINTER TO NEXT 2 WORDS OF SNAPSHOT

Page 993

041875,000279: 05,3646           50337                           INDEX    SUBLIST                               
041876,000280: 05,3647           00000                           0        0                                     #  = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
041877,000281: 05,3650           10000                           CCS      A                                     #  TEST FOR LAST TWO WORDS OF SNAPSHOT.
041878,000282: 05,3651           13634                           TCF      SNAPLOOP                              #  NOT LAST TWO.
041879,000283: 05,3652           03530        LDNPHAS2           GENADR   DNPHASE2                              
041880,000284: 05,3653           54337                           TS       SUBLIST                               #  YES, LAST.  SAVE A.
041881,000285: 05,3654           37752                           CA       NEGONE                                #  SET DNECADR AND
041882,000286: 05,3655           54336                           TS       DNECADR                               #        SUBLIST POINTERS
041883,000287: 05,3656           56337                           XCH      SUBLIST                               #                TO NEGATIVE VALUES
041884,000288: 05,3657           54003                           TS       EBANK                                 
041885,000289: 05,3660           74357                           MASK     LOW8                                  
041886,000290: 05,3661           00006                           EXTEND                                         
041887,000291: 05,3662           50000                           INDEX    A                                     
041888,000292: 05,3663  E3,1401                                  EBANK=   1401                                  
041889,000293: 05,3663           31402                           DCA      1401                                  #  PICK UP FIRST 2 WORDS OF SNAPSHOT.
041890,000294: 05,3664     0340                                  EBANK=   DNTMBUFF                              
041891,000295: 05,3664           13713        SNAPEND            TCF      DNTMEXIT                              #  NOW TO SEND THEM.
041892,000296: 
041893,000297: 05,3665           30336        FETCH2WD           CA       DNECADR                               
041894,000298: 05,3666           54003                           TS       EBANK                                 #  SET EBANK
041895,000299: 05,3667           74357                           MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS
041896,000300: 05,3670           54001                           TS       L                                     
041897,000301: 05,3671           33536                           CA       DNADRDCR                              #  DECREMENT COUNT AND ECADR
041898,000302: 05,3672           26336                           ADS      DNECADR                               
041899,000303: 05,3673           00006                           EXTEND                                         
041900,000304: 05,3674           50001                           INDEX    L                                     
041901,000305: 05,3675  E3,1400                                  EBANK=   1400                                  
041902,000306: 05,3675           31401                           DCA      1400                                  #  PICK UP 2 DATA WORDS
041903,000307: 05,3676     0340                                  EBANK=   DNTMBUFF                              
041904,000308: 05,3676           13713                           TCF      DNTMEXIT                              #  NOW GO SEND THEM.
041905,000309: 
041906,000310: 05,3677           54337        DOSUBLST           TS       SUBLIST                               #  SET SUBLIST POINTER
041907,000311: 05,3700           50337        NEXTINSL           INDEX    SUBLIST                               
041908,000312: 05,3701           00000                           0        0                                     #  = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
041909,000313: 05,3702           10000                           CCS      A                                     #  IS IT THE END OF THE SUBLIST
041910,000314: 05,3703           24337                           INCR     SUBLIST                               #  NO --
041911,000315: 05,3704           13710                           TCF      +4                                    
041912,000316: 05,3705           54337                           TS       SUBLIST                               #  SAVE A.
041913,000317: 05,3706           37752                           CA       NEGONE                                #  SET SUBLIST TO MINUS
041914,000318: 05,3707           56337                           XCH      SUBLIST                               #  RETRIEVE A.
041915,000319: 05,3710           24000                 +4        INCR     A                                     
041916,000320: 05,3711           54336                           TS       DNECADR                               #  SAVE DNADR
041917,000321: 05,3712           13571                           TCF      SETWO      +2                         #  GO USE COMMON CODING (PROLEMS WOULD
041918,000322:                                                                                                  #  OCCUR IF THE PROGRAM ENCOUNTERED A
041919,000323:                                                                                                  #  DNPTR NOW)
041920,000324: 
041921,000325: 05,3713           00006        DNTMEXIT           EXTEND                                         #  DOWN-TELEMETRY EXIT
041922,000326: 05,3714           01034                           WRITE    DNTM1                                 #  TO SEND A + L TO CHANNELS 34 + 35
041923,000327: 05,3715           30001                           CA       L                                     #  RESPECTIVELY
041924,000328: 05,3716           00006        TMEXITL            EXTEND                                         

Page 994

041926,000330: 05,3717           01035                           WRITE    DNTM2                                 
041927,000331: 05,3720           15270        TMRESUME           TCF      RESUME                                #  EXIT TELEMTRY PROGRAM VIA RESUME.
041928,000332: 
041929,000333: 05,3721     7744               MINB12             EQUALS   -1/8                                  
041930,000334: 05,3721     0336               DNECADR            EQUALS   TMINDEX                               
041931,000335: 05,3721     0334               CTLIST             EQUALS   LDATALST                              
041932,000336: 05,3721     0337               SUBLIST            EQUALS   DNQ                                   
041933,000337: 
041934,000338:                                                                                                  #  MOD BY -- DENSMORE -- JUNE 1969 -- ELIMINATE ERASABLE DUMP COUNT
041935,000339: 

Page 995

041937,000341:                                                                                                  #  SUBROUTINE NAME -- DNDUMP
041938,000342: 
041939,000343:                                                                                                  #  FUNCTIONAL DESCRIPTION -- TO SEND (DUMP) ALL 8 BANKS OF ERASABLE STORAGE TWICE.  BANKS ARE SENT ONE AT A TIME
041940,000344:                                                                                                  #        EACH BANK IS PRECEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
041941,000345:                                                                                                  #        EBANK.  EBANKS ARE DUMPED IN ORDER (I.E., EBANK 0 FIRST, THEN EBANK1 ETC.)
041942,000346: 
041943,000347:                                                                                                  #  CALLING SEQUENCE -- THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
041944,000348:                                                                                                  #        AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
041945,000349:                                                                                                  #        WILL BEGIN.
041946,000350: 
041947,000351:                                                                                                  #        ONCE INITITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
041948,000352:                                                                                                  #        BY THE FOLLOWING:
041949,000353: 
041950,000354:                                                                                                  #        1.      A FRESH START
041951,000355:                                                                                                  #        2.      COMPLETION OF BOTH COMPLETE DUMPS
041952,000356:                                                                                                  #        3.      AND INVOLUNTARILY BY A RESTART.
041953,000357: 
041954,000358:                                                                                                  #  NORMAL EXIT MODE -- TCF DNPHASE1
041955,000359: 
041956,000360:                                                                                                  #  ALARM OR ABORT MODE -- NONE
041957,000361: 
041958,000362:                                                                                                  #  *SUBROUTINES CALLED -- NONE
041959,000363: 
041960,000364:                                                                                                  #  ERASABLE INITIALIZATION REQUIRED --
041961,000365:                                                                                                  #        NONE
041962,000366: 
041963,000367:                                                                                                  #  DEBRIS -- DUMPLOC, DUMPSW, DNTMGOTO, EBANK, AND CENTRAL REGISTERS
041964,000368: 
041965,000369:                                                                                                  #  TIMING --     TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)*(WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
041966,000370:                                                                                                  #                TIME (IN SECS) =  (   4    )*(    8    )*(    256     +     4   )  /     100
041967,000371:                                                                                                  #                THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
041968,000372: 
041969,000373:                                                                                                  #  STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM --
041970,000374:                                                                                                  #        (REMINDER -- THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
041971,000375: 
041972,000376:                                                                                                  #        DOWNLIST                                W
041973,000377:                                                                                                  #          WORD  TAKEN FROM CONTENTS OF  EXAMPLE O       COMMENTS
041974,000378:                                                                                                  #            1   ERASID                   0177X  0       DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
041975,000379:                                                                                                  #            2   LOWIDCOD                 77340  1       DOWNLINK SYNCH BITS.  (SAME ONE USED IN ALL OTHER DOWNLISTS)
041976,000380:                                                                                                  #            3   DUMPLOC                  13400  1       (SEE NOTES ON DUMPLOC) 1 = 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
041977,000381:                                                                                                  #            4   TIME1                    14120  1       TIME IN CENTISECONDS
041978,000382:                                                                                                  #            5   FIRST WORD OF EBANK X    03400  1       IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
041979,000383:                                                                                                  #            6   2ND   WORD OF EBANK X    00142  1       IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
041980,000384:                                                                                                  #            7.  3RD   WORD OF EBANK X    00142  1       IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
041981,000385:                                                                                                  #            .
041982,000386:                                                                                                  #            .
041983,000387:                                                                                                  #            .
041984,000388:                                                                                                  #         260D   256TH WORD OF EBANK X    03777  1       IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
041985,000389: 
041986,000390:                                                                                                  #  NOTE --       DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
041987,000391:                                                                                                  #                THE BIT STRUCTURE OF DUMPLOC IS FOLLOW --
041988,000392:                                                                                                  #                                                X = NOT USED
041989,000393:                                                                                                  #                X ABC EEE RRRRRRRR            ABC = ERASABLE DUMP COUNTER (I.E. ABC = 0,1,2, OR 3 WHICH MEANS THAT
041990,000394:                                                                                                  #                                                    COMPLETE ERASABLE DUMP NUMBER 1,2,3, OR 4 RESPECTIVELY IS IN PROGRESS)
041991,000395:                                                                                                  #                                              EEE = EBANK BITS
041992,000396:                                                                                                  #                                         RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK
041993,000397: 
041994,000398: 05,3721           34755        DNDUMPI            CA       ZERO                                  #  INITIALIZE DOWNLINK
041995,000399: 05,3722           54336                           TS       DUMPLOC                               #  ERASABLE DUMP
041996,000400: 05,3723           03764                 +2        TC       SENDID                                #  GO SEND ID AND SYNCH BITS
041997,000401: 

Page 996

041999,000403: 05,3724           33733                           CA       LDNDUMP1                              #  SET DNTMGOTO
042000,000404: 05,3725           54335                           TS       DNTMGOTO                              #  TO LOCATION FOR NEXT PASS
042001,000405: 05,3726           30025                           CA       TIME1                                 #  PLACE TIME1
042002,000406: 05,3727           56001                           XCH      L                                     #  INTO L
042003,000407: 05,3730           30336                           CA       DUMPLOC                               #  AND ECADR OF THIS EBANK INTO A
042004,000408: 05,3731           13713                           TCF      DNTMEXIT                              #  SEND DUMPLOC AND TIME1
042005,000409: 
042006,000410: 05,3732           03734        LDNDUMP            ADRES    DNDUMP                                
042007,000411: 05,3733           03746        LDNDUMP1           ADRES    DNDUMP1                               
042008,000412: 
042009,000413: 05,3734           34752        DNDUMP             CA       TWO                                   #  INCREMENT ECADR IN DUMPLOC
042010,000414: 05,3735           26336                           ADS      DUMPLOC                               #  TO NEXT DP WORD TO BE
042011,000415: 05,3736           74357                           MASK     LOW8                                  #  DUMPED AND SAVE IT.
042012,000416: 05,3737           10000                           CCS      A                                     #  IS THIS THE BEGINNING OF A NEW EBANK
042013,000417: 05,3740           13750                           TCF      DNDUMP2                               #  NO -- THEN CONTINUE DUMPING
042014,000418: 05,3741           30336                           CA       DUMPLOC                               #  YES -- IS THIS THE END OF THE
042015,000419: 05,3742           74737                           MASK     BIT13                                 #  SECOND COMPLETE ERASABLE DUMP?
042016,000420: 05,3743           00006                           EXTEND                                         
042017,000421: 05,3744           13723                           BZF      DNDUMPI    +2                         #  NO -- GO BACK AND INITIALIZE NEXT BANK
042018,000422: 05,3745           13522                           TCF      DNPHASE1                              #  YES -- SEND DOWNLIST AGAIN
042019,000423: 05,3746           33732        DNDUMP1            CA       LDNDUMP                               #  SET DNTMGOTO
042020,000424: 05,3747           54335                           TS       DNTMGOTO                              #  FOR WORDS 3 TO 256D OF CURRENT EBANK
042021,000425: 
042022,000426: 05,3750           30336        DNDUMP2            CA       DUMPLOC                               
042023,000427: 05,3751           54003                           TS       EBANK                                 #  SET EBANK
042024,000428: 05,3752           74357                           MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS.
042025,000429: 05,3753           54002                           TS       Q                                     #  (NOTE: MASK INSTRUCTION IS USED TO PICK
042026,000430: 05,3754           34754                           CA       NEG0                                  #  UP ERASABLE REGISTERS TO THAT EDITING
042027,000431: 05,3755           54001                           TS       L                                     #  REGISTERS 20-23 WILL NOT BE ALTERED.)
042028,000432: 05,3756           50002                           INDEX    Q                                     
042029,000433: 05,3757  E3,1400                                  EBANK=   1400                                  #  PICK UP LOW ORDER REGISTER OF PAIR
042030,000434: 05,3757           71401                           MASK     1401                                  #  OF ERASABLE REGISTERS.
042031,000435: 05,3760           56001                           XCH      L                                     
042032,000436: 05,3761           50002                           INDEX    Q                                     #  PICK UP HIGH ORDER REGISTER OF PAIR
042033,000437: 05,3762           71400                           MASK     1400                                  #  OF ERASABLE REGISTERS.
042034,000438: 05,3763     0340                                  EBANK=   DNTMBUFF                              
042035,000439: 05,3763           13713                           TCF      DNTMEXIT                              #  GO SEND THEM
042036,000440: 
042037,000441: 05,3764           00006        SENDID             EXTEND                                         #  ** ENTRANCE USED BY ERASABLE DUMP PROG. **
042038,000442: 05,3765           22335                           QXCH     DNTMGOTO                              #  SET DNTMGOTO SO NEXT TIME PROG WILL GO
042039,000443: 05,3766           35011                           CAF      ERASID                                #  TO LOCATION FOLLOWING `TC SENDID'
042040,000444: 
042041,000445: 05,3767           54001                           TS       L                                     #  ** ENTRANCE USED BY REGULAR DOWNLINK PG **
042042,000446: 05,3770           03612                           TC       WOZERO                                #  GO SET WORD ORDER CODE TO ZERO
042043,000447: 05,3771           32065                           CAF      LOWIDCOD                              #  PLACE SPECIAL ID CODE INTO L
042044,000448: 05,3772           56001                           XCH      L                                     #  AND ID BACK INTO A
042045,000449: 05,3773           13713                           TCF      DNTMEXIT                              #  SEND DOWNLIST ID CODE(S).
042046,000450: 

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