Source Code

These source-code files were obtained by digitally photographing the Colossus 237 program listing from the private collection of original AGC developer Fred Martin, and then modifying pre-existing Colossus 249 (Apollo 9) source files to incorporate changes. Note that the page images presented online are of reduced quality, and that additional 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:

	GAP: ASSEMBLE REVISION 237 OF AGC PROGRAM COLOSSUS 
	BY NASA 2021111-031  1:17 AUG. 24, 1968

045719,000002:                                                                                                 #  Copyright:     Public domain.
045720,000003:                                                                                                 #  Filename:      DOWN-TELEMETRY_PROGRAM.agc
045721,000004:                                                                                                 #  Purpose:       Part of the source code for Colossus build 237.  
045722,000005:                                                                                                 #                 This is for the Command Module's (CM) Apollo Guidance
045723,000006:                                                                                                 #                 Computer (AGC), we believe for Apollo 8.
045724,000007:                                                                                                 #  Assembler:     yaYUL
045725,000008:                                                                                                 #  Contact:       Onno Hommes <ohommes@alumni.cmu.edu>
045726,000009:                                                                                                 #  Website:       www.ibiblio.org/apollo/index.html
045727,000010:                                                                                                 #  Page scans:    www.ibiblio.org/apollo/ScansForConversion/Colossus237/
045728,000011:                                                                                                 #  Mod history:   2010-05-22 OH   Adapted from corresponding Colossus 249 file.
045729,000012:                                                                                                 #                 2010-12-04 JL   Remove Colossus 249 header comments. Change to double-has page numbers.
045730,000013:                                                                                                 #                 2011-02-12 JL   Minor fixes.
045731,000014: 
045732,000015:                                                                                                 # # Page 1060
045733,000016:                                                                                                 #  PROGRAM NAME- DOWN TELEMETRY PROGRAM
045734,000017:                                                                                                 #  MOD NO.- 0      TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
045735,000018:                                                                                                 #                  PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
045736,000019:                                                                                                 #                  THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS.REFER TO DOWNLINK
045737,000020:                                                                                                 #                  LISTS LOG SECTION FOR MORE DETAILS. HOWEVER THIS CHANGES WILL NOT AFFECT THE GROUND PROCESSING
045738,000021:                                                                                                 #                  OF DOWN TELEMETRY DATA.
045739,000022:                                                                                                 #  MOD BY-  KILROY, SMITH, DEWITT
045740,000023:                                                                                                 #  DATE-    02OCT67
045741,000024:                                                                                                 #  AUTHORS- KILROY, SMITH, DWWITT, DEWOLF, FAGIN
045742,000025:                                                                                                 #  LOG SECTION- DOWN-TELEMETRY PROGRAM
045743,000026:                                                                                                 #  FUNCTIONAL DESCRIPTION- THIS ROUTINE IS INITIATED BY TELEMETRY END
045744,000027:                                                                                                 #           PULSE FROM THE DOWNLINK TELEMETRY CONVERTER. THIS PULSE OCCURS
045745,000028:                                                                                                 #           A1 50 TIMES PER SEC(EVERY 20 MS) THEREFORE DODOWNTM IS
045746,000029:                                                                                                 #           EXECUTED AT THESE RATES. THIS ROUTINE SELECTS THE APPROPRIATE
045747,000030:                                                                                                 #           AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
045748,000031:                                                                                                 #           CHANNELS 34 AND 35. THE INFORMATION IS THEN GATED OUT FROM THE
045749,000032:                                                                                                 #           LGC IN SERIAL FASHION.
045750,000033:                                                                                                 #           THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST. SINCE DOWNRUPTS
045751,000034:                                                                                                 #           OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
045752,000035:                                                                                                 #           CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
045753,000036:                                                                                                 #           OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
045754,000037:                                                                                                 #  CALLING SEQUENCE- NONE
045755,000038:                                                                                                 #           PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
045756,000039:                                                                                                 #           RESULT OF A DOWNRUPT. CONTROL IS RETURNED VIA TCF RESUME WHICH
045757,000040:                                                                                                 #           IN EFFECT IS A RESUME.
045758,000041:                                                                                                 #  SUBROUTINES CALLED- NONE
045759,000042:                                                                                                 #  NORMAL EXIT MODE- TCF RESUME
045760,000043:                                                                                                 #  ALARM OR ABORT EXIT MODE- NONE
045761,000044:                                                                                                 #  RESTART PROTECTION:
045762,000045:                                                                                                 #           ON A FRESH START AND RESTART THE 'STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER(ACTUALLY
045763,000046:                                                                                                 #           DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST(I.E. CURRENT CONTENTS OF DNLSTADR). THIS HAS THE
045764,000047:                                                                                                 #           EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
045765,000048:                                                                                                 #           THE RESTART(OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
045766,000049:                                                                                                 #           DOWNLIST.
045767,000050:                                                                                                 #           ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
045768,000051:                                                                                                 #  DOWNLINK LIST SELECTION:
045769,000052:                                                                                                 #           THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
045770,000053:                                                                                                 #           1. FRESH START
045771,000054:                                                                                                 #           2. V37EXXE  WHERE XX = THE MAJOR MODE BEING SELECTED. 
045772,000055:                                                                                                 #           3. UPDATE PROGRAM(P27)
045773,000056:                                                                                                 #           4.     NON-V37 SELECTABLE TYPE PROGRAMS(E.G. AGS INITIALIZATION(SUNDANCE,LUMINARY) AND P61-P62
045774,000057:                                                                                                 #                  TRANSITION(COLOSSUS) ETC.).
045775,000058:                                                                                                 #  DOWNLINK LIST RULES AND LIMITATIONS:
045776,000059:                                                                                                 #           READ SECTION(S) WHICH FOLLOW 'DEBRIS' WRITEUP.
045777,000060:                                                                                                 #  OUTPUT-  EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS(I.E. 200 LGC
045778,000061:                                                                                                 #           COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
045779,000062:                                                                                                 #  ERASABLE INITIALIZATION REQUIRED- NONE
045780,000063:                                                                                                 #           'DNTMGOTO' AND 'DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
045781,000064:                                                                                                 #  DEBRIS(ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM)-
045782,000065:                                                                                                 #           LDATALST,DNTMBUFF TO DNTMBUFF +21D,TMINDEX,DNQ.
045783,000066:                                                                                                 # # Page 1061
045784,000067: 
045785,000068: 
045786,000069:                                                                                                 # # Page 1062
045787,000070:                                                                                                 #  DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
045788,000071:                                                                                                 #  RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
045789,000072: 
045790,000073:                                                                                                 #  NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
045791,000074:                                                                                                 #  1. DOWNLISTS. - DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
045792,000075:                                                                                                 #     DOWN-TELEMETRY PROGRAM. THIS IS DONE FOR EASE OF CODING, FASTER
045793,000076:                                                                                                 #     EXECUTION.
045794,000077:                                                                                                 #  2. EACH DOWNLINK LIST CONSISTES OF A CONTROL LIST AND A NUMBER OF
045795,000078:                                                                                                 #     SUBLISTS.
045796,000079:                                                                                                 #  3. A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
045797,000080:                                                                                                 #     DOWNLINK LISTS.  ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
045798,000081:                                                                                                 #     CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
045799,000082:                                                                                                 #  4. SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENEOUS DATA WHICH MUST BE
045800,000083:                                                                                                 #     SAVED IN A BUFFER DURING ONE DOWNRUPT.
045801,000084:                                                                                                 #  5. THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
045802,000085:                                                                                                 #     OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
045803,000086:                                                                                                 #     IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
045804,000087:                                                                                                 #  6. ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
045805,000088:                                                                                                 #     CREATED FOR THE DOWNLIST PROGRAM.
045806,000089:                                                                                                 #     A. 1DNADR              1-WORD DOWNLIST ADDRESS.
045807,000090:                                                                                                 #         SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
045808,000091:                                                                                                 #         HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
045809,000092:                                                                                                 #     B. 2DNADR - 6DNADR     N-WORD DOWNLIST ADDRESS, N = 2 - 6.
045810,000093:                                                                                                 #         SAME AS 1DNADR, BUT WTIH THE 4 UNUSED BITS OF THE ECADR FORMAT
045811,000094:                                                                                                 #         FILLED IN WITH 0001-0101.  USED TO POINT TO A LIST OF N DOUBLE-
045812,000095:                                                                                                 #         PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
045813,000096:                                                                                                 #     C. DNCHAN              DOWNLIST CHANNEL ADDRESS.
045814,000097:                                                                                                 #         SAME AS 1DNADR, BUT WITH PREFIX BITS 0111.  USED TO POINT TO
045815,000098:                                                                                                 #         A PAIR OF CHANNELS FOR DOWN TELEMETRY.
045816,000099:                                                                                                 #     D. DNPTR               DOWN TELEMETRY SUBLIST POINTER.
045817,000100:                                                                                                 #      SAME AS CAF BUT TAGGED AS A CONSTANT. USED IN CONTROL LIST TO POINT TO A SUBLIST.
045818,000101:                                                                                                 #      CAUTION--- A DNPTR CANNOT BE USED IN A SUBLIST.
045819,000102:                                                                                                 #  7. THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E. CONTROL LIST) AND WHEN
045820,000103:                                                                                                 #     A '1DNADR TIME2' IS DETECTED IN THE CONTROL LIST(ONLY).
045821,000104:                                                                                                 #  8. IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
045822,000105: 
045823,000106:                                                                                                 #  DOWNLIST LIST RESTRICTIONS:
045824,000107:                                                                                                 #    (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO  IT IS CLEAR THAT THESE THINGS CANNOT BE
045825,000108:                                                                                                 #    DONE)
045826,000109: 
045827,000110:                                                                                                 #  1. SNAPSHOT DOWNLIST:
045828,000111:                                                                                                 #    (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E., 1DNADR'S): Q, 400, 1000, 1400, 2000, 2400, 3000, 3400.
045829,000112:                                                                                                 #    (B) CAN CONTAIN ONLY 1DNADR'S
045830,000113:                                                                                                 #  2. ALL DOWNLINKED DATA(EXCEPT CHANNELS) IS PICKED UP BY A <DCA<SO DOWNLINK LISTS CANNOT CONTAIN THE
045831,000114:                                                                                                 #     EQUIVALENT OF THE FOLLOWING ECADRS(I.E. IDNADRS): 377, 777, 1377, 1777, 2377, 27777, 3377, 3777.
045832,000115: 
045833,000116:                                                                                                 #     (NOTE: THE TERM EQUIVALENT ' MEANT THAT THE IDNADR  TO 6DNADR  WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
045834,000117: 
045835,000118:                                                                                                 #  3. CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777
045836,000119:                                                                                                 # # Page 1063
045837,000120:                                                                                                 #  4. THE '1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINT PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
045838,000121:                                                                                                 #     CONTROL SECTION OF THE DOWNLIST.
045839,000122: 
045840,000123:                                                                                                 #  5. 'DNCHAN 0' CANNOT BE USED.
045841,000124: 
045842,000125:                                                                                                 #  6. 'DNPTR 0' CANNOT BE USED.
045843,000126: 
045844,000127:                                                                                                 #  7. DNPTR CANNOT APPEAR IN A SUBLIST.
045845,000128: 
045846,000129: 
045847,000130: 
045848,000131: 
045849,000132:                                                                                                 #  EBANK SETTINGS
045850,000133:                                                                                                 #           IN THE PROCESS OF SETTING THE EBANK(WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
045851,000134:                                                                                                 #           'GARBAGE' INTO BITS15-12 OF EBANK. HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
045852,000135:                                                                                                 #           SIGNIFICANT SOMEDAY IN THE FUTURE. IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE(BY MASKING ETC.)
045853,000136:                                                                                                 #           THAT BITS 15-12 OF EBANK ARE ZERO.
045854,000137:                                                                                                 #  INITIALIZATION REQUIRED- TO INTERRUPT CURRENT LIST AND START A NEW ONE.,
045855,000138:                                                                                                 #      1.   ADRES OF DOWNLINK LIST INTO DNLSTADR
045856,000139:                                                                                                 #      2.   NEGONE INTO SUBLIST
045857,000140:                                                                                                 #      3.   NEGONE INTO DNECADR
045858,000141: 
045859,000142: 22,3505                                          BANK     22                                    
045860,000143: 05,2000                                          SETLOC   DOWNTELM                              
045861,000144: 05,2000                                          BANK                                           
045862,000145: 
045863,000146: 05,3331     0340                                 EBANK=   DNTMBUFF                              
045864,000147: 
045865,000148: 05,3331                                          COUNT    05/DPROG                              
045866,000149: 
045867,000150: 05,3331           54016        DODOWNTM          TS       BANKRUPT                              
045868,000151: 05,3332           00006                          EXTEND                                         
045869,000152: 05,3333           22012                          QXCH     QRUPT                                 #  SAVE Q
045870,000153: 05,3334           34704                          CA       BIT7                                  #  SET WORD ORDER CODE TO 1. EXCEPTION- AT
045871,000154: 05,3335           00006                          EXTEND                                         #  THE BEGINNING OF EACH LIST THE WORD
045872,000155: 05,3336           05013                          WOR      CHAN13                                #  CODE WILL BE SET BACK TO 0.
045873,000156: 05,3337           00335                          TC       DNTMGOTO                              #  GOTO APPROPRIATE PHASE OF PROGRAM
045874,000157: 
045875,000158: 05,3340           37716        DNPHASE1          CA       NEGONE                                #  INITIALIZE ALL CONTROL WORDS
045876,000159: 05,3341           54337                          TS       SUBLIST                               #  WORDS TO MINUS ONE
045877,000160: 05,3342           54336                          TS       DNECADR                               
045878,000161: 05,3343           33463                          CA       LDNPHAS2                              #  SET DNTMGOTO =0 ALL SUBSEQUENT DOWNRUPTS
045879,000162: 05,3344           54335                          TS       DNTMGOTO                              #  GO TO DNPHASE2
045880,000163: 05,3345           13361                          TCF      NEWLIST                               
045881,000164: 05,3346           10336        DNPHASE2          CCS      DNECADR                               #  SENDING OF DATA IN PROGRESS
045882,000165: 05,3347           03476        DODNADR           TC       FETCH2WD                              #  YES - THEN FETCH THE NEXT 2 SP WORDS
045883,000166: 05,3350           77753        MINTIME2          -1DNADR  TIME2                                 #  NEGATIVE OF TIME2 1DNADR
045884,000167: 05,3351           13352                          TCF      +1                                    #  (ECADR OF  3776 + 74001 = 77777)
045885,000168: 
045886,000169: 05,3352           10337                          CCS      SUBLIST                               #  IS THE SUBLIST IN CONTROL
045887,000170:                                                                                                 # # Page 1064
045888,000171: 05,3353           13511                          TCF      NEXTINSL                              #  YES
045889,000172: 05,3354           74001        DNADRDCR          OCT      74001                                 #  DNADR COUNT AND ECADR DECREMENTER
045890,000173: 
045891,000174: 05,3355           30334        CHKLIST           CA       CTLIST                                
045892,000175: 05,3356           00006                          EXTEND                                         
045893,000176: 05,3357           63361                          BZMF     NEWLIST                               #  IT WILL BE NEGATIVE AT END OF LIST
045894,000177: 05,3360           13366                          TCF      NEXTINCL                              
045895,000178: 05,3361           50332        NEWLIST           INDEX    DNLSTCOD                              
045896,000179: 05,3362           32342                          CA       DNTABLE                               #  INITIALIZE CTLIST WITH
045897,000180: 05,3363           54334                          TS       CTLIST                                #    STARTING ADDRESS OF NEW LIST
045898,000181: 05,3364           40332                          CS       DNLSTCOD                              
045899,000182: 05,3365           13601                          TCF      SENDID     +3                         
045900,000183: 05,3366           50334        NEXTINCL          INDEX    CTLIST                                
045901,000184: 05,3367           30000                          CA       0                                     
045902,000185: 05,3370           10000                          CCS      A                                     
045903,000186: 05,3371           24334                          INCR     CTLIST                                #  SET POINTER TO PICK UP NEXT CTLIST WORD
045904,000187: 05,3372           13376                          TCF      +4                                    #  ON NEXT ENTRY TO PROG. (A SHOULD NOT =0)
045905,000188: 05,3373           56334                          XCH      CTLIST                                #  SET CTLIST TO NEGATIVE AND PLACE(CODING)
045906,000189: 05,3374           40000                          COM                                            #  UNCOMPLEMENTED DNADR INTO A.    (FOR LA)
045907,000190: 05,3375           56334                          XCH      CTLIST                                #                                  (ST IN )
045908,000191: 05,3376           24000                 +4       INCR     A                                     #                                  (CTLIST)
045909,000192: 05,3377           54336                          TS       DNECADR                               #  SAVE DNADR
045910,000193: 05,3400           63350                          AD       MINTIME2                              #  TEST FOR TIME2 (NEG. OF ECADR)
045911,000194: 05,3401           10000                          CCS      A                                     
045912,000195: 05,3402           13406                          TCF      SETWO      +1                         #  DON'T SET WORD ORDER CODE
045913,000196: 05,3403           47777        MINB1314          OCT      47777                                 #  MINUS BIT 13 AND 14  (CAN'T GET HERE)
045914,000197: 05,3404           13406                          TCF      SETWO      +1                         #  DON'T SET WORD ORDER CODE
045915,000198: 05,3405           03430        SETWO             TC       WOZERO                                #  GO SET WORD ORDER CODE TO ZERO.
045916,000199: 05,3406           30336                 +1       CA       DNECADR                               #  RELOAD A WITH THE DNADR.
045917,000200: 05,3407           63403                 +2       AD       MINB1314                              #  IS THIS A REGULAR DNADR?
045918,000201: 05,3410           00006                          EXTEND                                         
045919,000202: 05,3411           63476                          BZMF     FETCH2WD                              #  YES. (A MUST NEVER BE ZERO)
045920,000203: 05,3412           67710                          AD       MINB12                                #  NO- IS IT A POINTER (DNPTR) OR A
045921,000204: 05,3413           00006                          EXTEND                                         #      CHANNEL(DNCHAN)
045922,000205: 05,3414           63434                          BZMF     DODNPTR                               #  IT'S A POINTER. (A MUST NEVER BE ZERO)
045923,000206: 
045924,000207: 05,3415           00006        DODNCHAN          TC       6                                     #  (EXECUTED AS EXTEND) IT S A CHANNEL
045925,000208: 05,3416           50336                          INDEX    DNECADR                               
045926,000209: 05,3417           44000                          INDEX    0          -4000                      #  (EXECUTED AS READ)
045927,000210: 05,3420           54001                          TS       L                                     
045928,000211: 05,3421           00006                          TC       6                                     #  (EXECUTED AS EXTEND)
045929,000212: 05,3422           50336                          INDEX    DNECADR                               
045930,000213: 05,3423           43777                          INDEX    0          -4001                      #  (EXECUTED AS READ)
045931,000214: 05,3424           54336                          TS       DNECADR                               #  SET DNECADR
045932,000215: 05,3425           37716                          CA       NEGONE                                #      TO MINUS
045933,000216: 05,3426           56336                          XCH      DNECADR                               #          WHILE PRESERVING A.
045934,000217: 05,3427           13524                          TCF      DNTMEXIT                              #  GO SEND CHANNELS
045935,000218: 
045936,000219: 05,3430           44704        WOZERO            CS       BIT7                                  
045937,000220: 05,3431           00006                          EXTEND                                         
045938,000221:                                                                                                 # # Page 1065
045939,000222: 05,3432           03013                          WAND     CHAN13                                #  SET WORD ORDER CODE TO ZERO
045940,000223: 05,3433           00002                          TC       Q                                     #  RETURN TO CALLER
045941,000224: 
045942,000225: 05,3434           50336        DODNPTR           INDEX    DNECADR                               #  DNECADR CONTAINS ADRES OF SUBLIST
045943,000226: 05,3435           00000                          0        0                                     #  CLEAR AND ADD LIST ENTRY INTO A.
045944,000227: 05,3436           10000                          CCS      A                                     #  IS THIS A SNAPSHOT SUBLIST
045945,000228: 05,3437           30336                          CA       DNECADR                               #  NO, IT IS A REGULAR SUBLIST.
045946,000229: 05,3440           13510                          TCF      DOSUBLST                              #  A MUST NOT BE ZERO.
045947,000230: 
045948,000231: 05,3441           56336                          XCH      DNECADR                               #  YES, IT IS A SNAPSHOT SUBLIST.
045949,000232: 05,3442           54337                          TS       SUBLIST                               #  C(DNECADR) INTO SUBLIST
045950,000233: 05,3443           34714                          CAF      ZERO                                  #       A    INTO    A
045951,000234: 05,3444           56336                          XCH      TMINDEX                               #  (NOTE.. TMINDEX = DNECADR)
045952,000235: 
045953,000236: 
045954,000237:                                                                                                 #  THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND)IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
045955,000238:                                                                                                 #  THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
045956,000239:                                                                                                 #  THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
045957,000240:                                                                                                 #  TO MINIMIZE TIME. THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
045958,000241:                                                                                                 #  THESE RULES ARE......
045959,000242:                                                                                                 #            1.    ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
045960,000243:                                                                                                 #            2.    THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY  BANK.
045961,000244: 
045962,000245: 
045963,000246: 05,3445           54003        SNAPLOOP          TS       EBANK                                 #  SET EBANK
045964,000247: 05,3446           74373                          MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS
045965,000248: 05,3447           00006                          EXTEND                                         
045966,000249: 05,3450           50000                          INDEX    A                                     
045967,000250: 05,3451  E3,1401                                 EBANK=   1401                                  
045968,000251: 05,3451           31402                          DCA      1401                                  #  PICK UP 2 SNAPSHOT WORDS.
045969,000252: 05,3452     0340                                 EBANK=   DNTMBUFF                              
045970,000253: 05,3452           50336                          INDEX    TMINDEX                               
045971,000254: 05,3453           52341                          DXCH     DNTMBUFF                              #  STORE 2 SNAPSHOT WORDS IN BUFFER
045972,000255: 05,3454           24336                          INCR     TMINDEX                               #  SET BUFFER INDEX FOR NEXT 2 WORDS.
045973,000256: 05,3455           24336                          INCR     TMINDEX                               
045974,000257: 05,3456           24337        SNAPAGN           INCR     SUBLIST                               #  SET POINTER TO NEXT 2 WORDS OF SNAPSHOT
045975,000258: 05,3457           50337                          INDEX    SUBLIST                               
045976,000259: 05,3460           00000                          0        0                                     #  = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
045977,000260: 05,3461           10000                          CCS      A                                     #  TEST FOR LAST TWO WORDS OF SNAPSHOT.
045978,000261: 05,3462           13445                          TCF      SNAPLOOP                              #  NOT LAST TWO.
045979,000262: 05,3463           03346        LDNPHAS2          GENADR   DNPHASE2                              
045980,000263: 05,3464           54337                          TS       SUBLIST                               #  YES, LAST.  SAVE A.
045981,000264: 05,3465           37716                          CA       NEGONE                                #  SET DNECADR AND
045982,000265: 05,3466           54336                          TS       DNECADR                               #      SUBLIST POINTERS
045983,000266: 05,3467           56337                          XCH      SUBLIST                               #          TO NEGATIVE VALUES
045984,000267: 05,3470           54003                          TS       EBANK                                 
045985,000268: 05,3471           74373                          MASK     LOW8                                  
045986,000269: 05,3472           00006                          EXTEND                                         
045987,000270: 05,3473           50000                          INDEX    A                                     
045988,000271: 05,3474  E3,1401                                 EBANK=   1401                                  
045989,000272:                                                                                                 # # Page 1066
045990,000273: 05,3474           31402                          DCA      1401                                  #  PICK UP FIRST 2 WORDS OF SNAPSHOT.
045991,000274: 05,3475     0340                                 EBANK=   DNTMBUFF                              
045992,000275: 05,3475           13524        SNAPEND           TCF      DNTMEXIT                              #     NOW GO SEND THEM.
045993,000276: 
045994,000277: 05,3476           30336        FETCH2WD          CA       DNECADR                               
045995,000278: 05,3477           54003                          TS       EBANK                                 #  SET EBANK
045996,000279: 05,3500           74373                          MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS
045997,000280: 05,3501           54001                          TS       L                                     
045998,000281: 05,3502           33354                          CA       DNADRDCR                              #  DECREMENT COUNT AND ECADR
045999,000282: 05,3503           26336                          ADS      DNECADR                               
046000,000283: 05,3504           00006                          EXTEND                                         
046001,000284: 05,3505           50001                          INDEX    L                                     
046002,000285: 05,3506  E3,1400                                 EBANK=   1400                                  
046003,000286: 05,3506           31401                          DCA      1400                                  #  PICK UP 2 DATA WORDS
046004,000287: 05,3507     0340                                 EBANK=   DNTMBUFF                              
046005,000288: 05,3507           13524                          TCF      DNTMEXIT                              #     NOW GO SEND THEM.
046006,000289: 
046007,000290: 05,3510           54337        DOSUBLST          TS       SUBLIST                               #  SET SUBLIST POINTER
046008,000291: 05,3511           50337        NEXTINSL          INDEX    SUBLIST                               
046009,000292: 05,3512           00000                          0        0                                     #  = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
046010,000293: 05,3513           10000                          CCS      A                                     #  IS IT THE END OF THE SUBLIST
046011,000294: 05,3514           24337                          INCR     SUBLIST                               #  NO-
046012,000295: 05,3515           13521                          TCF      +4                                    
046013,000296: 05,3516           54337                          TS       SUBLIST                               #  SAVE A.
046014,000297: 05,3517           37716                          CA       NEGONE                                #  SET SUBLIST TO MINUS
046015,000298: 05,3520           56337                          XCH      SUBLIST                               #  RETRIEVE A.
046016,000299: 05,3521           24000                 +4       INCR     A                                     
046017,000300: 05,3522           54336                          TS       DNECADR                               #  SAVE DNADR
046018,000301: 05,3523           13407                          TCF      SETWO      +2                         #  GO USE COMMON CODING(PROLEMS WOULD
046019,000302:                                                                                                 #                                           OCCUR IF THE PROGRAM ENCOUNTERED A
046020,000303:                                                                                                 #                                           DNPTR NOW)
046021,000304: 
046022,000305: 05,3524           00006        DNTMEXIT          EXTEND                                         #  DOWN-TELEMETRY EXIT
046023,000306: 05,3525           01034                          WRITE    DNTM1                                 #  TO SEND A + L TO CHANNELS 34 + 35
046024,000307: 05,3526           30001                          CA       L                                     #  RESPECTIVELY
046025,000308: 05,3527           00006        TMEXITL           EXTEND                                         
046026,000309: 05,3530           01035                          WRITE    DNTM2                                 
046027,000310: 05,3531           15222        TMRESUME          TCF      RESUME                                #  EXIT TELEMTRY PROGRAM VIA RESUME.
046028,000311: 
046029,000312: 05,3532     7710               MINB12            EQUALS   -1/8                                  
046030,000313: 05,3532     0336               DNECADR           EQUALS   TMINDEX                               
046031,000314: 05,3532     0334               CTLIST            EQUALS   LDATALST                              
046032,000315: 05,3532     0337               SUBLIST           EQUALS   DNQ                                   
046033,000316: 
046034,000317:                                                                                                 # # Page 1067
046035,000318:                                                                                                 #  SUBROUTINE NAME- DNDUMP
046036,000319:                                                                                                 #  FUNCTIONAL DESCRIPTION - TO SEND(DUMP) ALL ERASABLE STORAGE 'N' TIMES.(N = 1 TO 4). BANKS ARE SENT ONE AT A TIME
046037,000320:                                                                                                 #           EACH BANK IS PRECEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
046038,000321:                                                                                                 #           EBANK. EBANKS ARE DUMPED IN ORDER (I.E. EBANK 0 FIRST, THEN EBANK1 ETC.)
046039,000322:                                                                                                 #  CALLING SEQUENCE- THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
046040,000323:                                                                                                 #           AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
046041,000324:                                                                                                 #           WILL BEGIN.
046042,000325:                                                                                                 #           ONCE INITITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
046043,000326:                                                                                                 #           BY THE FOLLOWING:
046044,000327:                                                                                                 #           1. A FRESH START
046045,000328:                                                                                                 #           2. COMPLETION OF ALL DOWNLINK DUMPS REQUESTED (ACCORDING TO BITS SET IN DUMPCNT). NOTE THAT DUMPCNT
046046,000329:                                                                                                 #              CAN BE ALTERED BY A V21N01.
046047,000330:                                                                                                 #           3. AND INVOLUNTARILY BY A RESTART.
046048,000331:                                                                                                 #  NORMAL EXIT MODE- TCF DNPHASE1
046049,000332:                                                                                                 #  ALARM OR ABORT MODE- NONE
046050,000333:                                                                                                 #  *SUBROUTINES CALLED- NONE
046051,000334:                                                                                                 #  ERASABLE INITIALIZATION REQUIRED-
046052,000335:                                                                                                 #           DUMPCNT   OCT 20000   IF 4 COMPLETE ERASABLE DUMPS ARE DESIRED
046053,000336:                                                                                                 #           DUMPCNT   OCT 10000   IF 2 COMPLETE ERASABLE DUMPS ARE DESIRED
046054,000337:                                                                                                 #           DUMPCNT   OCT 04000   IF 1 COMPLETE ERASABLE DUMP  IS  DESIRED
046055,000338:                                                                                                 #  DEBRIS- DUMPLOC, DUMPSW, DNTMGOTO, EBANK AND CENTRAL REGISTERS
046056,000339:                                                                                                 #  TIMING-   TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)* (WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
046057,000340:                                                                                                 #            TIME (IN SECS) =  (   4    )*(    8    )* (    256     +     4   )  /     100
046058,000341:                                                                                                 #       THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
046059,000342: 
046060,000343:                                                                                                 #  STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM-
046061,000344:                                                                                                 #     (REMINDER-THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
046062,000345:                                                                                                 #          DOWNLIST                                 W
046063,000346:                                                                                                 #           WORD   TAKEN FROM CONTENTS OF   EXAMPLE O  COMMENTS
046064,000347: 
046065,000348:                                                                                                 #             1    ERASID                    0177X  0  DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
046066,000349:                                                                                                 #             2    LOWIDCOD                  77340  1  DOWNLINK SYNCH BITS.(SAME ONE USED IN ALL OTHER DOWNLISTS)
046067,000350:                                                                                                 #             3    DUMPLOC                   13400  1  (SEE NOTES ON DUMPLOC)1= 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
046068,000351:                                                                                                 #             4    TIME1                     14120  1  TIME IN CENTISECONDS
046069,000352:                                                                                                 #             5    FIRST WORD OF EBANK X     03400  1  IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
046070,000353:                                                                                                 #             6    2ND   WORD OF EBANK X     00142  1  IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
046071,000354:                                                                                                 #             7.   3RD   WORD OF EBANK X     00142  1  IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
046072,000355:                                                                                                 #             .                                     1
046073,000356:                                                                                                 #             .                                     1
046074,000357:                                                                                                 #             .                                     1
046075,000358:                                                                                                 #            260D  256TH WORD OF EBANK X     03777  1  IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
046076,000359: 
046077,000360:                                                                                                 #  NOTE- DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
046078,000361:                                                                                                 #        THE BIT STRUCTURE OF DUMPLOC IS FOLLOWS---
046079,000362:                                                                                                 #                                        X = NOT USED
046080,000363:                                                                                                 #           X ABC EEE RRRRRRRR         ABC = ERASABLE DUMP COUNTER(I.E. ABC = 0,1,2, OR 3 WHICH MEANS THAT
046081,000364:                                                                                                 #                                            COMPLETE ERASABLE DUMP NUMBER  1,2,3, OR 4 RESPECTIVELY IS IN PROGRESS)
046082,000365:                                                                                                 #                                      EEE = EBANK BITS
046083,000366:                                                                                                 #                                 RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK.
046084,000367: 
046085,000368:                                                                                                 # # Page 1068
046086,000369: 05,3532           34714        DNDUMPI           CA       ZERO                                  #  INITIALIZE DOWNLINK
046087,000370: 05,3533           54336                          TS       DUMPLOC                               #  ERASABLE DUMP
046088,000371: 05,3534           03576                 +2       TC       SENDID                                #  GO SEND ID AND SYNCH BITS
046089,000372: 05,3535           33544                          CA       LDNDUMP1                              #  SET DNTMGOTO
046090,000373: 05,3536           54335                          TS       DNTMGOTO                              #  TO LOCATION FOR NEXT PASS
046091,000374: 05,3537           30025                          CA       TIME1                                 #  PLACE TIME1
046092,000375: 05,3540           56001                          XCH      L                                     #  INTO L
046093,000376: 05,3541           30336                          CA       DUMPLOC                               #  AND ECADR OF THIS EBANK INTO A
046094,000377: 05,3542           13524                          TCF      DNTMEXIT                              #  SEND DUMPLOC AND TIME1
046095,000378: 
046096,000379: 05,3543           03545        LDNDUMP           ADRES    DNDUMP                                
046097,000380: 05,3544           03560        LDNDUMP1          ADRES    DNDUMP1                               
046098,000381: 
046099,000382: 05,3545           34711        DNDUMP            CA       TWO                                   #  INCREMENT ECADR IN DUMPLOC
046100,000383: 05,3546           26336                          ADS      DUMPLOC                               #  TO NEXT DP WORD TO BE
046101,000384: 05,3547           74373                          MASK     LOW8                                  #  DUMPED AND SAVE IT.
046102,000385: 05,3550           10000                          CCS      A                                     #  IS THIS THE BEGINNING OF A NEW EBANK
046103,000386: 05,3551           13562                          TCF      DNDUMP2                               #  NO- THEN CONTINUE DUMPING
046104,000387: 05,3552           30336                          CA       DUMPLOC                               #  YES- IS THIS THE END OF THE
046105,000388: 05,3553           70333                          MASK     DUMPCNT                               #  N TH(N = 1 TO 4) COMPLETE ERASABLE
046106,000389: 05,3554           77671                          MASK     PRIO34                                #  DUMP(BIT14 FOR 4, BIT13 FOR 2 OR BIT12
046107,000390: 05,3555           10000                          CCS      A                                     #  FOR 1 COMPLETE ERASABLE DUMP(S)).
046108,000391: 05,3556           13340                          TCF      DNPHASE1                              #  YES- START SENDING INTERRUPTED DOWNLIST
046109,000392:                                                                                                 #                                           AGAIN
046110,000393: 05,3557           13534                          TCF      DNDUMPI    +2                         #  NO- GO BACK AND INITIALZE NEXT BANK
046111,000394: 
046112,000395: 05,3560           33543        DNDUMP1           CA       LDNDUMP                               #  SET DNTMGOTO
046113,000396: 05,3561           54335                          TS       DNTMGOTO                              #  FOR WORDS 3 TO 256D OF CURRENT EBANK
046114,000397: 
046115,000398: 05,3562           30336        DNDUMP2           CA       DUMPLOC                               
046116,000399: 05,3563           54003                          TS       EBANK                                 #  SET EBANK
046117,000400: 05,3564           74373                          MASK     LOW8                                  #  ISOLATE RELATIVE ADDRESS.
046118,000401: 05,3565           54002                          TS       Q                                     #  (NOTE: MASK INSTRUCTION IS USED TO PICK
046119,000402: 05,3566           34713                          CA       NEG0                                  #  UP ERASABLE REGISTERS TO THAT EDITING
046120,000403: 05,3567           54001                          TS       L                                     #  REGISTERS 20-23 WILL NOT BE ALTERED.)
046121,000404: 05,3570           50002                          INDEX    Q                                     
046122,000405: 05,3571  E3,1400                                 EBANK=   1400                                  #  PICK UP LOW ORDER REGISTER OF PAIR
046123,000406: 05,3571           71401                          MASK     1401                                  #  OF ERASABLE REGISTERS.
046124,000407: 05,3572           56001                          XCH      L                                     
046125,000408: 05,3573           50002                          INDEX    Q                                     #  PICK UP HIGH ORDER REGISTER OF PAIR
046126,000409: 05,3574           71400                          MASK     1400                                  #  OF ERASABLE REGISTERS.
046127,000410: 05,3575     0340                                 EBANK=   DNTMBUFF                              
046128,000411: 05,3575           13524                          TCF      DNTMEXIT                              #  GO SEND THEM
046129,000412: 
046130,000413: 
046131,000414: 05,3576           00006        SENDID            EXTEND                                         #  **ENTRANCE USED BY ERASABLE DUMP PROG.**
046132,000415: 05,3577           22335                          QXCH     DNTMGOTO                              #  SET DNTMGOTO SO NEXT TIME PROG WILL GO
046133,000416: 05,3600           34747                          CAF      ERASID                                #  TO LOCATION FOLLOWING :TC SENDID:
046134,000417: 
046135,000418: 05,3601           54001                          TS       L                                     #  **ENTRANCE USED BY REGULAR DOWNLINK PG**
046136,000419:                                                                                                 # # Page 1069
046137,000420: 05,3602           03430                          TC       WOZERO                                #  GO SET WORD ORDER CODE TO ZERO
046138,000421: 05,3603           32000                          CAF      LOWIDCOD                              #  PLACE SPECIAL ID CODE INTO L
046139,000422: 05,3604           56001                          XCH      L                                     #  AND ID BACK INTO A
046140,000423: 05,3605           13524                          TCF      DNTMEXIT                              #  SEND DOWNLIST ID CODE(S).

End of include-file DOWN-TELEMETRY_PROGRAM.agc.  Parent file is MAIN.agc