Source Code
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These source-code files are part of a reconstructed copy of LM131 revision 1,
the final release of the Apollo 13 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The source reconstruction began with source code of Luminary 131 previously
transcribed from a digitized copy of that program. A dump of the flight spare
core rope memory module B5, part number 2010802-171, serial number RAY 411,
was obtained. This module is the only module different between Luminary 131
and LM131 revision 1. The dump was disassembled and all changes were incorporated
into these source files. Note that page numbers in the reconstructed code match
those on the Luminary 131 printout, although the changed code would likely have
changed page numbers for a real LM131 revision 1 listing.
Comments from the original source code are prefixed with a single '#' symbol,
whereas comments added later are prefixed by "##" or "###". Report any errors
noted by creating an
issue report at the Virtual AGC
project's GitHub repository.
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042025,000002: ## Copyright: Public domain.
042026,000003: ## Filename: DOWN-TELEMETRY_PROGRAM.agc
042027,000004: ## Purpose: A section of LM131 revision 1.
042028,000005: ## It is part of the reconstructed source code for the final
042029,000006: ## release of the flight software for the Lunar Module's (LM)
042030,000007: ## Apollo Guidance Computer (AGC) for Apollo 13. The code has
042031,000008: ## been reconstructed from a listing of Luminary 131 and a dump
042032,000009: ## of a core rope memory module B5, part number 2010802-171,
042033,000010: ## which is the only module different between LM131 revision 1
042034,000011: ## and Luminary 131. The executable generated from this source
042035,000012: ## has been verified against the module dump, so while the names,
042036,000013: ## comments, and ordering may not be exactly correct, the
042037,000014: ## resulting binary is.
042038,000015: ## Reference: pp. 982-991
042039,000016: ## Assembler: yaYUL
042040,000017: ## Contact: Ron Burkey <info@sandroid.org>.
042041,000018: ## Website: www.ibiblio.org/apollo/index.html
042042,000019: ## Mod history: 2022-10-28 MAS Created from Luminary 131.
042043,000020:
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Page 982
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042045,000022: # PROGRAM NAME - DOWN TELEMETRY PROGRAM
042046,000023: # MOD NO. - 0 TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
042047,000024: # PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
042048,000025: # THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS. REFER TO DOWNLINK
042049,000026: # LISTS LOG SECTION FOR MORE DETAILS. HOWEVER THIS CHANGE WILL NOT AFFECT THE GROUND PROCESSING
042050,000027: # OF DOWN TELEMETRY DATA.
042051,000028: # MOD BY - KILROY, SMITH, DEWITT
042052,000029: # DATE - 02 OCT 67
042053,000030: # AUTHORS - KILROY, SMITH, DEWITT, DEWOLF, FAGIN
042054,000031: # LOG SECTION - DOWN-TELEMETRY PROGRAM
042055,000032:
042056,000033: # FUNCTIONAL DESCRIPTION - THIS ROUTINE IS INITIATED BY TELEMETRY END
042057,000034: # PULSE FROM THE DOWNLINK TELEMETRY CONVERTER. THIS PULSE OCCURS
042058,000035: # AT 50 TIMES PER SEC (EVERY 20 MS) THEREFORE DODOWNTM IS
042059,000036: # EXECUTED AT THESE RATES. THIS ROUTINE SELECTS THE APPROPRIATE
042060,000037: # AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
042061,000038: # CHANNELS 34 AND 35. THE INFORMATION IS THEN GATED OUT FROM THE
042062,000039: # LGC IN SERIAL FASHION.
042063,000040:
042064,000041: # THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST. SINCE DOWNRUPTS
042065,000042: # OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
042066,000043: # CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
042067,000044: # OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
042068,000045:
042069,000046: # CALLING SEQUENCE - NONE
042070,000047: # PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
042071,000048: # RESULT OF A DOWNRUPT. CONTROL IS RETURNED VIA TCF RESUME WHICH
042072,000049: # IN EFFECT IS A RESUME.
042073,000050:
042074,000051: # SUBROUTINES CALLED - NONE
042075,000052:
042076,000053: # NORMAL EXIT MODE - TCF RESUME
042077,000054:
042078,000055: # ALARM OR ABORT EXIT MODE - NONE
042079,000056:
042080,000057: # RESTART PROTECTION:
042081,000058: # ON A FRESH START AND RESTART THE 'STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER (ACTUALLY
042082,000059: # DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST (I.E. CURRENT CONTENTS OF DNLSTADR). THIS HAS THE
042083,000060: # EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
042084,000061: # THE RESTART (OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
042085,000062: # DOWNLIST.
042086,000063:
042087,000064: # ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
042088,000065:
042089,000066: # DOWNLINK LIST SELECTION:
042090,000067: # THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
042091,000068: # 1. FRESH START
042092,000069: # 2. V37EXXE WHERE XX = THE MAJOR MODE BEING SELECTED.
042093,000070: # 3. UPDATE PROGRAM (P27)
042094,000071: # 4. NON-V37 SELECTABLE TYPE PROGRAMS (E.G. AGS INITIALIZATION (SUNDANCE, LUMINARY) AND P61-P62
042095,000072: # TRANSITION(COLOSSUS) ETC.).
042096,000073:
042097,000074: # DOWNLINK LIST RULES AND LIMITATIONS:
042098,000075: # READ SECTION(S) WHICH FOLLOW 'DEBRIS' WRITEUP.
042099,000076:
042100,000077: # OUTPUT - EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS (I.E. 200 LGC
042101,000078: # COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
042102,000079:
042103,000080: # ERASABLE INITIALIZATION REQUIRED - NONE
042104,000081: # 'DNTMGOTO' AND 'DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
042105,000082:
042106,000083: # DEBRIS (ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM) -
042107,000084: # LDATALST, DNTMBUFF TO DNTMBUFF +21D, TMINDEX, DNQ.
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Page 983
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042110,000087:
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Page 984
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042112,000089: # DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
042113,000090: # RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
042114,000091:
042115,000092: # NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
042116,000093: # 1. DOWNLISTS. - DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
042117,000094: # DOWN-TELEMETRY PROGRAM. THIS IS DONE FOR EASE OF CODING, FASTER
042118,000095: # EXECUTION.
042119,000096: # 2. EACH DOWNLINK LIST CONSISTS OF A CONTROL LIST AND A NUMBER OF
042120,000097: # SUBLISTS.
042121,000098: # 3. A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
042122,000099: # DOWNLINK LISTS. ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
042123,000100: # CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
042124,000101: # 4. SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENOUS DATA WHICH MUST BE
042125,000102: # SAVED IN A BUFFER DURING ONE DOWNRUPT.
042126,000103: # 5. THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
042127,000104: # OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
042128,000105: # IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
042129,000106: # 6. ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
042130,000107: # CREATED FOR THE DOWNLIST PROGRAM.
042131,000108: # A. 1DNADR 1-WORD DOWNLIST ADDRESS.
042132,000109: # SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
042133,000110: # HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
042134,000111: # B. 2DNADR - 6DNADR N-WORD DOWNLIST ADDRESS, N = 2 - 6.
042135,000112: # SAME AS 1DNADR, BUT WITH THE 4 UNUSED BITS OF THE ECADR FORMAT
042136,000113: # FILLED IN WITH 0001-0101. USED TO POINT TO A LIST OF N DOUBLE-
042137,000114: # PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
042138,000115: # C. DNCHAN DOWNLIST CHANNEL ADDRESS.
042139,000116: # SAME AS 1DNADR, BUT WITH PREFIX BITS 0111. USED TO POINT TO
042140,000117: # A PAIR OF CHANNELS FOR DOWN TELEMETRY.
042141,000118: # D. DNPTR DOWN TELEMETRY SUBLIST POINTER.
042142,000119: # SAME AS CAF BUT TAGGED AS A CONSTANT. USED IN CONTROL LIST TO POINT TO A SUBLIST.
042143,000120: # CAUTION--- A DNPTR CANNOT BE USED IN A SUBLIST.
042144,000121: # 7. THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E. CONTROL LIST) AND WHEN
042145,000122: # A '1DNADR TIME2' IS DETECTED IN THE CONTROL LIST (ONLY).
042146,000123: # 8. IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
042147,000124:
042148,000125: # DOWNLINK LIST RESTRICTIONS:
042149,000126: # (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO IT IS CLEAR THAT THESE THINGS CANNOT BE
042150,000127: # DONE)
042151,000128: # 1. SNAPSHOT DOWNLIST:
042152,000129: # (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E. 1DNADR'S): 0, 400, 1000, 1400, 2000, 2400, 3000, 3400.
042153,000130: # (B) CAN CONTAIN ONLY 1DNADR'S
042154,000131: # 2. ALL DOWNLINKED DATA (EXCEPT CHANNELS) IS PICKED UP BY A <DCA<SO DOWNLINK LISTS CANNOT CONTAIN THE
042155,000132: # EQUIVALENT OF THE FOLLOWING ECADRS (I.E. IDNADRS): 377, 777, 1377, 1777, 2377, 27777, 3377, 3777.
042156,000133: # (NOTE: THE TERM EQUIVALENT ' MEANT THAT THE IDNADR TO 6DNADR WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
042157,000134: # 3. CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777
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Page 985
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042159,000136: # 4. THE '1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINK PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
042160,000137: # CONTROL SECTION OF THE DOWNLIST.
042161,000138: # 5. 'DNCHAN 0' CANNOT BE USED.
042162,000139: # 6. 'DNPTR 0' CANNOT BE USED.
042163,000140: # 7. DNPTR CANNOT APPEAR IN A SUBLIST.
042164,000141:
042165,000142: # EBANK SETTINGS
042166,000143: # IN THE PROCESS OF SETTING THE EBANK (WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
042167,000144: # 'GARBAGE' INTO BITS15-12 OF EBANK. HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
042168,000145: # SIGNIFICANT SOMEDAY IN THE FUTURE. IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE (BY MASKING ETC.)
042169,000146: # THAT BITS 15-12 OF EBANK ARE ZERO.
042170,000147:
042171,000148: # INITIALIZATION REQUIRED - TO INTERRUPT CURRENT LIST AND START A NEW ONE..
042172,000149: # 1. ADRES OF DOWNLINK LIST INTO DNLSTADR
042173,000150: # 2. NEGONE INTO SUBLIST
042174,000151: # 3. NEGONE INTO DNECADR
042175,000152:
042176,000153: 22,3711 BANK 22
042177,000154: 05,2000 SETLOC DOWNTELM
042178,000155: 05,2000 BANK
042179,000156:
042180,000157: 05,3505 0340 EBANK= DNTMBUFF
042181,000158: 05,3505 COUNT* $$/DPROG
042182,000159: 05,3505 54016 DODOWNTM TS BANKRUPT
042183,000160: 05,3506 00006 EXTEND
042184,000161: 05,3507 22012 QXCH QRUPT # SAVE Q
042185,000162: 05,3510 34745 CA BIT7 # AT THE BEGINNING OF THE LIST THE WORD
042186,000163: 05,3511 00006 EXTEND # ORDER BIT WILL BE SET BACK TO ZERO.
042187,000164: 05,3512 02013 RAND CHAN13
042188,000165: 05,3513 10000 CCS A
042189,000166: 05,3514 00335 TC DNTMGOTO
042190,000167: 05,3515 06022 TC C13STALL
042191,000168: 05,3516 34745 CA BIT7
042192,000169: 05,3517 00006 EXTEND # SET WORD ORDER BIT TO 1 ONLY IF IT
042193,000170: 05,3520 05013 WOR CHAN13 # ALREADY ISN'T.
042194,000171: 05,3521 00335 TC DNTMGOTO # GOTO APPROPRIATE PHASE OF PROGRAM
042195,000172:
042196,000173: 05,2000 SETLOC DOWNTELM
042197,000174: 05,2000 BANK
042198,000175:
042199,000176: 05,3522 37752 DNPHASE1 CA NEGONE # INITIALIZE ALL CONTROL WORDS
042200,000177: 05,3523 54337 TS SUBLIST # WORDS TO MINUS ONE
042201,000178: 05,3524 54336 TS DNECADR
042202,000179: 05,3525 33652 CA LDNPHAS2 # SET DNTMGOTO =O ALL SUBSEQUENT DOWNRUPTS
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Page 986
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042204,000181: 05,3526 54335 TS DNTMGOTO # GO TO DNPHASE2
042205,000182: 05,3527 13543 TCF NEWLIST
042206,000183: 05,3530 10336 DNPHASE2 CCS DNECADR # SENDING OF DATA IN PROGRESS
042207,000184: 05,3531 03665 DODNADR TC FETCH2WD # YES - THEN FETCH THE NEXT 2 SP WORDS
042208,000185: 05,3532 77753 MINTIME2 -1DNADR TIME2 # NEGATIVE OF TIME2 1DNADR
042209,000186: 05,3533 13534 TCF +1 # (ECADR OF 3776 + 74001 = 77777)
042210,000187:
042211,000188: 05,3534 10337 CCS SUBLIST # IS THE SUBLIST IN CONTROL
042212,000189: 05,3535 13700 TCF NEXTINSL # YES
042213,000190: 05,3536 74001 DNADRDCR OCT 74001 # DNADR COUNT AND ECADR DECREMENTER
042214,000191:
042215,000192: 05,3537 30334 CHKLIST CA CTLIST
042216,000193: 05,3540 00006 EXTEND
042217,000194: 05,3541 63543 BZMF NEWLIST # IT WILL BE NEGATIVE AT END OF LIST
042218,000195: 05,3542 13550 TCF NEXTINCL
042219,000196: 05,3543 50333 NEWLIST INDEX DNLSTCOD
042220,000197: 05,3544 32441 CA DNTABLE # INITIALIZE CTLIST WITH
042221,000198: 05,3545 54334 TS CTLIST # STARTING ADDRESS OF NEW LIST
042222,000199: 05,3546 40333 CS DNLSTCOD
042223,000200: 05,3547 13767 TCF SENDID +3
042224,000201: 05,3550 50334 NEXTINCL INDEX CTLIST
042225,000202: 05,3551 30000 CA 0
042226,000203: 05,3552 10000 CCS A
042227,000204: 05,3553 24334 INCR CTLIST # SET POINTER TO PICK UP NEXT CTLIST WORD
042228,000205: 05,3554 13560 TCF +4 # ON NEXT ENTRY TO PROG. (A SHOULD NOT =0)
042229,000206: 05,3555 56334 XCH CTLIST # SET CTLIST TO NEGATIVE AND PLACE(CODING)
042230,000207: 05,3556 40000 COM # UNCOMPLEMENTED DNADR INTO A. (FOR LA)
042231,000208: 05,3557 56334 XCH CTLIST # (ST IN )
042232,000209: 05,3560 24000 +4 INCR A # (CTLIST)
042233,000210: 05,3561 54336 TS DNECADR # SAVE DNADR
042234,000211: 05,3562 63532 AD MINTIME2 # TEST FOR TIME2 (NEG. OF ECADR)
042235,000212: 05,3563 10000 CCS A
042236,000213: 05,3564 13570 TCF SETWO +1 # DON'T SET WORD ORDER CODE
042237,000214: 05,3565 47777 MINB1314 OCT 47777 # MINUS BIT 13 AND 14 (CAN'T GET HERE)
042238,000215: 05,3566 13570 TCF SETWO +1 # DON'T SET WORD ORDER CODE
042239,000216: 05,3567 03612 SETWO TC WOZERO # GO SET WORD ORDER CODE TO ZERO.
042240,000217: 05,3570 30336 +1 CA DNECADR # RELOAD A WITH THE DNADR.
042241,000218: 05,3571 63565 +2 AD MINB1314 # IS THIS A REGULAR DNADR?
042242,000219: 05,3572 00006 EXTEND
042243,000220: 05,3573 63665 BZMF FETCH2WD # YES. (A MUST NEVER BE ZERO)
042244,000221: 05,3574 67744 AD MINB12 # NO- IS IT A POINTER (DNPTR) OR A
042245,000222: 05,3575 00006 EXTEND # CHANNEL(DNCHAN)
042246,000223: 05,3576 63623 BZMF DODNPTR # IT'S A POINTER. (A MUST NEVER BE ZERO)
042247,000224:
042248,000225: 05,3577 00006 DODNCHAN TC 6 # (EXECUTED AS EXTEND) IT S A CHANNEL
042249,000226: 05,3600 50336 INDEX DNECADR
042250,000227: 05,3601 44000 INDEX 0 -4000 # (EXECUTED AS READ)
042251,000228: 05,3602 54001 TS L
042252,000229: 05,3603 00006 TC 6 # (EXECUTED AS EXTEND)
042253,000230: 05,3604 50336 INDEX DNECADR
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Page 987
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042255,000232: 05,3605 43777 INDEX 0 -4001 # (EXECUTED AS READ)
042256,000233: 05,3606 54336 TS DNECADR # SET DNECADR
042257,000234: 05,3607 37752 CA NEGONE # TO MINUS
042258,000235: 05,3610 56336 XCH DNECADR # WHILE PRESERVING A.
042259,000236: 05,3611 13713 TCF DNTMEXIT # GO SEND CHANNELS
042260,000237:
042261,000238: 05,3612 00006 WOZERO EXTEND
042262,000239: 05,3613 23265 QXCH C13QSAV
042263,000240: 05,3614 22070 LXCH RUPTREG1
042264,000241: 05,3615 06022 TC C13STALL
042265,000242:
042266,000243: 05,3616 22070 LXCH RUPTREG1
042267,000244: 05,3617 44745 CS BIT7
042268,000245: 05,3620 00006 EXTEND
042269,000246: 05,3621 03013 WAND CHAN13 # SET WORD ORDER CODE TO ZERO
042270,000247: 05,3622 01265 TC C13QSAV
042271,000248:
042272,000249: 05,3623 50336 DODNPTR INDEX DNECADR # DNECADR CONTAINS ADRES OF SUBLIST
042273,000250: 05,3624 00000 0 0 # CLEAR AND ADD LIST ENTRY INTO A.
042274,000251: 05,3625 10000 CCS A # IS THIS A SNAPSHOT SUBLIST
042275,000252: 05,3626 30336 CA DNECADR # NO, IT IS A REGULAR SUBLIST.
042276,000253: 05,3627 13677 TCF DOSUBLST # A MUST NOT BE ZERO.
042277,000254:
042278,000255: 05,3630 56336 XCH DNECADR # YES, IT IS A SNAPSHOT SUBLIST.
042279,000256: 05,3631 54337 TS SUBLIST # C(DNECADR) INTO SUBLIST
042280,000257: 05,3632 34755 CAF ZERO # A INTO A
042281,000258: 05,3633 56336 XCH TMINDEX # (NOTE.. TMINDEX = DNECADR)
042282,000259:
042283,000260: # THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND) IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
042284,000261: # THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
042285,000262: # THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
042286,000263: # TO MINIMIZE TIME. THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
042287,000264: # THESE RULES ARE ......
042288,000265: # 1. ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
042289,000266: # 2. THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY BANK.
042290,000267:
042291,000268: 05,3634 54003 SNAPLOOP TS EBANK # SET EBANK
042292,000269: 05,3635 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS
042293,000270: 05,3636 00006 EXTEND
042294,000271: 05,3637 50000 INDEX A
042295,000272: 05,3640 E3,1401 EBANK= 1401
042296,000273: 05,3640 31402 DCA 1401 # PICK UP 2 SNAPSHOT WORDS.
042297,000274: 05,3641 0340 EBANK= DNTMBUFF
042298,000275: 05,3641 50336 INDEX TMINDEX
042299,000276: 05,3642 52341 DXCH DNTMBUFF # STORE 2 SNAPSHOT WORDS IN BUFFER
042300,000277: 05,3643 24336 INCR TMINDEX # SET BUFFER INDEX FOR NEXT 2 WORDS.
042301,000278: 05,3644 24336 INCR TMINDEX
042302,000279: 05,3645 24337 SNAPAGN INCR SUBLIST # SET POINTER TO NEXT 2 WORDS OF SNAPSHOT
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Page 988
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042304,000281: 05,3646 50337 INDEX SUBLIST
042305,000282: 05,3647 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
042306,000283: 05,3650 10000 CCS A # TEST FOR LAST TWO WORDS OF SNAPSHOT.
042307,000284: 05,3651 13634 TCF SNAPLOOP # NOT LAST TWO.
042308,000285: 05,3652 03530 LDNPHAS2 GENADR DNPHASE2
042309,000286: 05,3653 54337 TS SUBLIST # YES, LAST. SAVE A.
042310,000287: 05,3654 37752 CA NEGONE # SET DNECADR AND
042311,000288: 05,3655 54336 TS DNECADR # SUBLIST POINTERS
042312,000289: 05,3656 56337 XCH SUBLIST # TO NEGATIVE VALUES.
042313,000290: 05,3657 54003 TS EBANK
042314,000291: 05,3660 74357 MASK LOW8
042315,000292: 05,3661 00006 EXTEND
042316,000293: 05,3662 50000 INDEX A
042317,000294: 05,3663 E3,1401 EBANK= 1401
042318,000295: 05,3663 31402 DCA 1401 # PICK UP FIRST 2 WORDS OF SNAPSHOT.
042319,000296: 05,3664 0340 EBANK= DNTMBUFF
042320,000297: 05,3664 13713 SNAPEND TCF DNTMEXIT # NOW GO SEND THEM.
042321,000298:
042322,000299: 05,3665 30336 FETCH2WD CA DNECADR
042323,000300: 05,3666 54003 TS EBANK # SET EBANK
042324,000301: 05,3667 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS
042325,000302: 05,3670 54001 TS L
042326,000303: 05,3671 33536 CA DNADRDCR # DECREMENT COUNT AND ECADR
042327,000304: 05,3672 26336 ADS DNECADR
042328,000305: 05,3673 00006 EXTEND
042329,000306: 05,3674 50001 INDEX L
042330,000307: 05,3675 E3,1400 EBANK= 1400
042331,000308: 05,3675 31401 DCA 1400 # PICK UP 2 DATA WORDS
042332,000309: 05,3676 0340 EBANK= DNTMBUFF
042333,000310: 05,3676 13713 TCF DNTMEXIT # NOW GO SEND THEM.
042334,000311:
042335,000312: 05,3677 54337 DOSUBLST TS SUBLIST # SET SUBLIST POINTER
042336,000313: 05,3700 50337 NEXTINSL INDEX SUBLIST
042337,000314: 05,3701 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
042338,000315: 05,3702 10000 CCS A # IS IT THE END OF THE SUBLIST
042339,000316: 05,3703 24337 INCR SUBLIST # NO -
042340,000317: 05,3704 13710 TCF +4
042341,000318: 05,3705 54337 TS SUBLIST # SAVE A.
042342,000319: 05,3706 37752 CA NEGONE # SET SUBLIST TO MINUS
042343,000320: 05,3707 56337 XCH SUBLIST # RETRIEVE A.
042344,000321: 05,3710 24000 +4 INCR A
042345,000322: 05,3711 54336 TS DNECADR # SAVE DNADR
042346,000323: 05,3712 13571 TCF SETWO +2 # GO USE COMMON CODING (PROBLEMS WOULD
042347,000324: # OCCUR IF THE PROGRAM ENCOUNTERED A
042348,000325: # DNPTR NOW)
042349,000326:
042350,000327: 05,3713 00006 DNTMEXIT EXTEND # DOWN-TELEMETRY EXIT
042351,000328: 05,3714 01034 WRITE DNTM1 # TO SEND A + L TO CHANNELS 34 + 35
042352,000329: 05,3715 30001 CA L # RESPECTIVELY
042353,000330: 05,3716 00006 TMEXITL EXTEND
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Page 989
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042355,000332: 05,3717 01035 WRITE DNTM2
042356,000333: 05,3720 15270 TMRESUME TCF RESUME # EXIT TELEMETRY PROGRAM VIA RESUME.
042357,000334:
042358,000335: 05,3721 7744 MINB12 EQUALS -1/8
042359,000336: 05,3721 0336 DNECADR EQUALS TMINDEX
042360,000337: 05,3721 0334 CTLIST EQUALS LDATALST
042361,000338: 05,3721 0337 SUBLIST EQUALS DNQ
042362,000339:
042363,000340: # MOD BY - DENSMORE - JUNE 1969 - ELIMINATE ERASABLE DUMP COUNT
042364,000341:
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Page 990
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042366,000343: # SUBROUTINE NAME - DNDUMP
042367,000344:
042368,000345: # FUNCTIONAL DESCRIPTION - TO SEND (DUMP) ALL 8 BANKS OF ERASABLE STORAGE TWICE. BANKS ARE SENT ONE AT A TIME
042369,000346: # EACH BANK IS PRECEEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
042370,000347: # EBANK. EBANKS ARE DUMPED IN ORDER (I.E. EBANK 0 FIRST, THEN EBANK1 ETC.)
042371,000348:
042372,000349: # CALLING SEQUENCE - THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
042373,000350: # AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
042374,000351: # WILL BEGIN.
042375,000352:
042376,000353: # ONCE INITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
042377,000354: # BY THE FOLLOWING:
042378,000355:
042379,000356: # 1. A FRESH START
042380,000357: # 2. COMPLETION OF BOTH COMPLETE DUMPS
042381,000358: # 3. AND INVOLUNTARILY BY A RESTART.
042382,000359:
042383,000360: # NORMAL EXIT MODE - TCF DNPHASE1
042384,000361:
042385,000362: # ALARM OR ABORT MODE - NONE
042386,000363:
042387,000364: # *SUBROUTINES CALLED - NONE.
042388,000365:
042389,000366: # ERASABLE INITIALIZATION REQUIRED -
042390,000367: # NONE
042391,000368:
042392,000369: # DEBRIS - DUMPLOC, DUMPSW, DNTMGOTO, EBANK AND CENTRAL REGISTERS
042393,000370:
042394,000371: # TIMING - TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)*(WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
042395,000372: # TIME (IN SECS) = ( 4 )*( 8 )*( 256 + 4 ) / 100
042396,000373: # THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
042397,000374:
042398,000375: # STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM -
042399,000376: # (REMINDER - THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
042400,000377:
042401,000378: # DOWNLIST W
042402,000379: # WORD TAKEN FROM CONTENTS OF EXAMPLE O COMMENTS
042403,000380: # 1 ERASID 0177X 0 DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
042404,000381: # 2 LOWIDCOD 77340 1 DOWNLINK SYNCH BITS. (SAME ONE USED IN ALL OTHER DOWNLISTS)
042405,000382: # 3 DUMPLOC 13400 1 (SEE NOTES ON DUMPLOC) 1 = 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
042406,000383: # 4 TIME1 14120 1 TIME IN CENTISECONDS
042407,000384: # 5 FIRST WORD OF EBANK X 03400 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
042408,000385: # 6 2ND WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
042409,000386: # 7 3RD WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
042410,000387: # . 1
042411,000388: # . 1
042412,000389: # . 1
042413,000390: # 260D 256TH WORD OF EBANK X 03777 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
042414,000391:
042415,000392: # NOTE - DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
042416,000393: # THE BIT STRUCTURE OF DUMPLOC IS FOLLOWS---
042417,000394: # X = NOT USED
042418,000395: # X ABC EEE RRRRRRRR ABC = ERASABLE DUMP COUNTER (I.E. ABC = 0,1,2 OR 3 WHICH MEANS THAT
042419,000396: # COMPLETE ERASABLE DUMP NUMBER 1,2,3 OR 4 RESPECTIVELY IS IN PROGRESS)
042420,000397: # EEE = EBANK BITS
042421,000398: # RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK.
042422,000399:
042423,000400: 05,3721 34755 DNDUMPI CA ZERO # INITIALIZE DOWNLINK
042424,000401: 05,3722 54336 TS DUMPLOC # ERASABLE DUMP
042425,000402: 05,3723 03764 +2 TC SENDID # GO SEND ID AND SYNCH BITS
042426,000403:
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042428,000405: 05,3724 33733 CA LDNDUMP1 # SET DNTMGOTO
042429,000406: 05,3725 54335 TS DNTMGOTO # TO LOCATION FOR NEXT PASS
042430,000407: 05,3726 30025 CA TIME1 # PLACE TIME1
042431,000408: 05,3727 56001 XCH L # INTO L
042432,000409: 05,3730 30336 CA DUMPLOC # AND ECADR OF THIS EBANK INTO A
042433,000410: 05,3731 13713 TCF DNTMEXIT # SEND DUMPLOC AND TIME1
042434,000411:
042435,000412: 05,3732 03734 LDNDUMP ADRES DNDUMP
042436,000413: 05,3733 03746 LDNDUMP1 ADRES DNDUMP1
042437,000414:
042438,000415: 05,3734 34752 DNDUMP CA TWO # INCREMENT ECADR IN DUMPLOC
042439,000416: 05,3735 26336 ADS DUMPLOC # TO NEXT DP WORD TO BE
042440,000417: 05,3736 74357 MASK LOW8 # DUMPED AND SAVE IT.
042441,000418: 05,3737 10000 CCS A # IS THIS THE BEGINNING OF A NEW EBANK
042442,000419: 05,3740 13750 TCF DNDUMP2 # NO - THEN CONTINUE DUMPING
042443,000420: 05,3741 30336 CA DUMPLOC # YES - IS THIS THE END OF THE
042444,000421: 05,3742 74737 MASK BIT13 # SECOND COMPLETE ERASABLE DUMP?
042445,000422: 05,3743 00006 EXTEND
042446,000423: 05,3744 13723 BZF DNDUMPI +2 # NO - GO BACK AND INITIALIZE NEXT BANK
042447,000424: 05,3745 13522 TCF DNPHASE1 # YES - SEND DOWNLIST AGAIN
042448,000425: 05,3746 33732 DNDUMP1 CA LDNDUMP # SET DNTMGOTO
042449,000426: 05,3747 54335 TS DNTMGOTO # FOR WORDS 3 TO 256D OF CURRENT EBANK
042450,000427:
042451,000428: 05,3750 30336 DNDUMP2 CA DUMPLOC
042452,000429: 05,3751 54003 TS EBANK # SET EBANK
042453,000430: 05,3752 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS.
042454,000431: 05,3753 54002 TS Q # (NOTE: MASK INSTRUCTION IS USED TO PICK
042455,000432: 05,3754 34754 CA NEG0 # UP ERASABLE REGISTERS SO THAT EDITING
042456,000433: 05,3755 54001 TS L # REGISTERS 20-23 WILL NOT BE ALTERED.)
042457,000434: 05,3756 50002 INDEX Q
042458,000435: 05,3757 E3,1400 EBANK= 1400 # PICK UP LOW ORDER REGISTER OF PAIR
042459,000436: 05,3757 71401 MASK 1401 # OF ERASABLE REGISTERS.
042460,000437: 05,3760 56001 XCH L
042461,000438: 05,3761 50002 INDEX Q # PICK UP HIGH ORDER REGISTER OF PAIR
042462,000439: 05,3762 71400 MASK 1400 # OF ERASABLE REGISTERS.
042463,000440: 05,3763 0340 EBANK= DNTMBUFF
042464,000441: 05,3763 13713 TCF DNTMEXIT # GO SEND THEM
042465,000442:
042466,000443: 05,3764 00006 SENDID EXTEND # ** ENTRANCE USED BY ERASABLE DUMP PROG. **
042467,000444: 05,3765 22335 QXCH DNTMGOTO # SET DNTMGOTO SO NEXT TIME PROG WILL GO
042468,000445: 05,3766 35011 CAF ERASID # TO LOCATION FOLLOWING :TC SENDID:
042469,000446:
042470,000447: 05,3767 54001 TS L # ** ENTRANCE USED BY REGULAR DOWNLINK PG **
042471,000448: 05,3770 03612 TC WOZERO # GO SET WORD ORDER CODE TO ZERO
042472,000449: 05,3771 32065 CAF LOWIDCOD # PLACE SPECIAL ID CODE INTO L
042473,000450: 05,3772 56001 XCH L # AND ID BACK INTO A
042474,000451: 05,3773 13713 TCF DNTMEXIT # SEND DOWNLIST ID CODE(S).
042475,000452:
End of include-file DOWN-TELEMETRY_PROGRAM.agc. Parent file is MAIN.agc