GAP: ASSEMBLE REVISION 131 OF AGC PROGRAM LUMINARY BY NASA 2021112-091 17:53 DEC. 19, 1969Note that the date is the date the printout was made, not the date on which the program revision was released, although these happen to be very close together.
Source Code
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This source code is very close to the Apollo Guidance Computer software for the
Apollo 13 Lunar module. This revision of the Luminary 131 program is from December
of 1969, whereas there was a later revision in January of 1970, and still another
revision in February, which is the code that flew on the mission.
As far as this transcription is concerned, it was originally from a copy made in 1991 of
a printout from the collection of AGC developer Don Eyles for collector David Craig.
It was subsequently scanned by Gary Neff, reprocessed for online
presentation at the now-discontinued History of Recent Science and Technology (HRST) website
of MIT's Dibner Institute (the full-quality scans being discarded in the process),
and finally transcribed by Ron Burkey for the Virtual AGC Project. Although a
high-quality replacement scan for a completely illegible page was later provided by Gary
Neff, the reduced legibility of the reprocessed HRST posting nevertheless caused many
errors to be introduced into the transcription. Accordingly, a second scan of the same physical
printout was made in 2017 for the Virtual AGC Project's collection at the Internet Archive,
and used to correct the transcription errors. All of the scanned materials mentioned,
as well as other Luminary 131 related material, are available online.
Don Eyles apprently made additional hand-written notes in printout between 1991 and 2017,
so the two scans are not identical in that respect. The page-headings in the printout read, in part:GAP: ASSEMBLE REVISION 131 OF AGC PROGRAM LUMINARY BY NASA 2021112-091 17:53 DEC. 19, 1969Note that the date is the date the printout was made, not the date on which the program revision was released, although these happen to be very close together. |
042077,000002: ## Copyright: Public domain.
042078,000003: ## Filename: DOWN_TELEMETRY_PROGRAM.agc
042079,000004: ## Purpose: A section of Luminary 1C, revision 131.
042080,000005: ## It is part of the source code for the Lunar Module's (LM)
042081,000006: ## Apollo Guidance Computer (AGC) for Apollo 13.
042082,000007: ## This file is intended to be a faithful transcription, except
042083,000008: ## that the code format has been changed to conform to the
042084,000009: ## requirements of the yaYUL assembler rather than the
042085,000010: ## original YUL assembler.
042086,000011: ## Reference: pp. 982-991
042087,000012: ## Contact: Ron Burkey <info@sandroid.org>.
042088,000013: ## Website: www.ibiblio.org/apollo/index.html
042089,000014: ## Mod history: 05/29/03 RSB. Began transcribing.
042090,000015: ## 05/14/05 RSB Corrected website reference above.
042091,000016: ## 2010-08-24 JL Fixed page 995 number.
042092,000017: ## 2010-10-25 JL Indentation fixes.
042093,000018: ## 2017-01-06 RSB Page numbers now agree with those on the
042094,000019: ## original hardcopy, as opposed to the PDF page
042095,000020: ## numbers in 1701.pdf.
042096,000021: ## 2017-01-28 RSB Back-ported some comment-text fixes
042097,000022: ## identified from Luminary 69.
042098,000023: ## 2017-02-26 RSB Proofed comment text using octopus/ProoferComments.
042099,000024: ## 2017-03-01 RSB Fixed lingering typos.
042100,000025: ## 2017-03-13 RSB Comment-text fixes noted in proofing Luminary 116.
042101,000026: ## 2017-03-15 RSB Comment-text fixes identified in 5-way
042102,000027: ## side-by-side diff of Luminary 69/99/116/131/210.
042103,000028:
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Page 982 |
042105,000030: # PROGRAM NAME - DOWN TELEMETRY PROGRAM
042106,000031: # MOD NO. - 0 TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
042107,000032: # PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
042108,000033: # THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS. REFER TO DOWNLINK
042109,000034: # LISTS LOG SECTION FOR MORE DETAILS. HOWEVER THIS CHANGE WILL NOT AFFECT THE GROUND PROCESSING
042110,000035: # OF DOWN TELEMETRY DATA.
042111,000036: # MOD BY - KILROY, SMITH, DEWITT
042112,000037: # DATE - 02 OCT 67
042113,000038: # AUTHORS - KILROY, SMITH, DEWITT, DEWOLF, FAGIN
042114,000039: # LOG SECTION - DOWN-TELEMETRY PROGRAM
042115,000040:
042116,000041: # FUNCTIONAL DESCRIPTION - THIS ROUTINE IS INITIATED BY TELEMETRY END
042117,000042: # PULSE FROM THE DOWNLINK TELEMETRY CONVERTER. THIS PULSE OCCURS
042118,000043: # AT 50 TIMES PER SEC (EVERY 20 MS) THEREFORE DODOWNTM IS
042119,000044: # EXECUTED AT THESE RATES. THIS ROUTINE SELECTS THE APPROPRIATE
042120,000045: # AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
042121,000046: # CHANNELS 34 AND 35. THE INFORMATION IS THEN GATED OUT FROM THE
042122,000047: # LGC IN SERIAL FASHION.
042123,000048:
042124,000049: # THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST. SINCE DOWNRUPTS
042125,000050: # OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
042126,000051: # CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
042127,000052: # OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
042128,000053:
042129,000054: # CALLING SEQUENCE - NONE
042130,000055: # PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
042131,000056: # RESULT OF A DOWNRUPT. CONTROL IS RETURNED VIA TCF RESUME WHICH
042132,000057: # IN EFFECT IS A RESUME.
042133,000058:
042134,000059: # SUBROUTINES CALLED - NONE
042135,000060:
042136,000061: # NORMAL EXIT MODE - TCF RESUME
042137,000062:
042138,000063: # ALARM OR ABORT EXIT MODE - NONE
042139,000064:
042140,000065: # RESTART PROTECTION:
042141,000066: # ON A FRESH START AND RESTART THE 'STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER (ACTUALLY
042142,000067: # DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST (I.E. CURRENT CONTENTS OF DNLSTADR). THIS HAS THE
042143,000068: # EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
042144,000069: # THE RESTART (OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
042145,000070: # DOWNLIST.
042146,000071:
042147,000072: # ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
042148,000073:
042149,000074: # DOWNLINK LIST SELECTION:
042150,000075: # THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
042151,000076: # 1. FRESH START
042152,000077: # 2. V37EXXE WHERE XX = THE MAJOR MODE BEING SELECTED.
042153,000078: # 3. UPDATE PROGRAM (P27)
042154,000079: # 4. NON-V37 SELECTABLE TYPE PROGRAMS (E.G. AGS INITIALIZATION (SUNDANCE, LUMINARY) AND P61-P62
042155,000080: # TRANSITION(COLOSSUS) ETC.).
042156,000081:
042157,000082: # DOWNLINK LIST RULES AND LIMITATIONS:
042158,000083: # READ SECTION(S) WHICH FOLLOW 'DEBRIS' WRITEUP.
042159,000084:
042160,000085: # OUTPUT - EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS (I.E. 200 LGC
042161,000086: # COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
042162,000087:
042163,000088: # ERASABLE INITIALIZATION REQUIRED - NONE
042164,000089: # 'DNTMGOTO' AND 'DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
042165,000090:
042166,000091: # DEBRIS (ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM) -
042167,000092: # LDATALST, DNTMBUFF TO DNTMBUFF +21D, TMINDEX, DNQ.
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Page 983
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042170,000095:
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Page 984 |
042172,000097: # DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
042173,000098: # RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
042174,000099:
042175,000100: # NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
042176,000101: # 1. DOWNLISTS. - DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
042177,000102: # DOWN-TELEMETRY PROGRAM. THIS IS DONE FOR EASE OF CODING, FASTER
042178,000103: # EXECUTION.
042179,000104: # 2. EACH DOWNLINK LIST CONSISTS OF A CONTROL LIST AND A NUMBER OF
042180,000105: # SUBLISTS.
042181,000106: # 3. A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
042182,000107: # DOWNLINK LISTS. ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
042183,000108: # CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
042184,000109: # 4. SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENOUS DATA WHICH MUST BE
042185,000110: # SAVED IN A BUFFER DURING ONE DOWNRUPT.
042186,000111: # 5. THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
042187,000112: # OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
042188,000113: # IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
042189,000114: # 6. ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
042190,000115: # CREATED FOR THE DOWNLIST PROGRAM.
042191,000116: # A. 1DNADR 1-WORD DOWNLIST ADDRESS.
042192,000117: # SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
042193,000118: # HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
042194,000119: # B. 2DNADR - 6DNADR N-WORD DOWNLIST ADDRESS, N = 2 - 6.
042195,000120: # SAME AS 1DNADR, BUT WITH THE 4 UNUSED BITS OF THE ECADR FORMAT
042196,000121: # FILLED IN WITH 0001-0101. USED TO POINT TO A LIST OF N DOUBLE-
042197,000122: # PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
042198,000123: # C. DNCHAN DOWNLIST CHANNEL ADDRESS.
042199,000124: # SAME AS 1DNADR, BUT WITH PREFIX BITS 0111. USED TO POINT TO
042200,000125: # A PAIR OF CHANNELS FOR DOWN TELEMETRY.
042201,000126: # D. DNPTR DOWN TELEMETRY SUBLIST POINTER.
042202,000127: # SAME AS CAF BUT TAGGED AS A CONSTANT. USED IN CONTROL LIST TO POINT TO A SUBLIST.
042203,000128: # CAUTION--- A DNPTR CANNOT BE USED IN A SUBLIST.
042204,000129: # 7. THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E. CONTROL LIST) AND WHEN
042205,000130: # A '1DNADR TIME2' IS DETECTED IN THE CONTROL LIST (ONLY).
042206,000131: # 8. IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
042207,000132:
042208,000133: # DOWNLINK LIST RESTRICTIONS:
042209,000134: # (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO IT IS CLEAR THAT THESE THINGS CANNOT BE
042210,000135: # DONE)
042211,000136: # 1. SNAPSHOT DOWNLIST:
042212,000137: # (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E. 1DNADR'S): 0, 400, 1000, 1400, 2000, 2400, 3000, 3400.
042213,000138: # (B) CAN CONTAIN ONLY 1DNADR'S
042214,000139: # 2. ALL DOWNLINKED DATA (EXCEPT CHANNELS) IS PICKED UP BY A <DCA<SO DOWNLINK LISTS CANNOT CONTAIN THE
042215,000140: # EQUIVALENT OF THE FOLLOWING ECADRS (I.E. IDNADRS): 377, 777, 1377, 1777, 2377, 27777, 3377, 3777.
042216,000141: # (NOTE: THE TERM EQUIVALENT ' MEANT THAT THE IDNADR TO 6DNADR WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
042217,000142: # 3. CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777
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Page 985 |
042219,000144: # 4. THE '1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINK PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
042220,000145: # CONTROL SECTION OF THE DOWNLIST.
042221,000146: # 5. 'DNCHAN 0' CANNOT BE USED.
042222,000147: # 6. 'DNPTR 0' CANNOT BE USED.
042223,000148: # 7. DNPTR CANNOT APPEAR IN A SUBLIST.
042224,000149:
042225,000150: # EBANK SETTINGS
042226,000151: # IN THE PROCESS OF SETTING THE EBANK (WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
042227,000152: # 'GARBAGE' INTO BITS15-12 OF EBANK. HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
042228,000153: # SIGNIFICANT SOMEDAY IN THE FUTURE. IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE (BY MASKING ETC.)
042229,000154: # THAT BITS 15-12 OF EBANK ARE ZERO.
042230,000155:
042231,000156: # INITIALIZATION REQUIRED - TO INTERRUPT CURRENT LIST AND START A NEW ONE..
042232,000157: # 1. ADRES OF DOWNLINK LIST INTO DNLSTADR
042233,000158: # 2. NEGONE INTO SUBLIST
042234,000159: # 3. NEGONE INTO DNECADR
042235,000160:
042236,000161: 22,3711 BANK 22
042237,000162: 05,2000 SETLOC DOWNTELM
042238,000163: 05,2000 BANK
042239,000164:
042240,000165: 05,3505 0340 EBANK= DNTMBUFF
042241,000166: 05,3505 COUNT* $$/DPROG
042242,000167: 05,3505 54016 DODOWNTM TS BANKRUPT
042243,000168: 05,3506 00006 EXTEND
042244,000169: 05,3507 22012 QXCH QRUPT # SAVE Q
042245,000170: 05,3510 34745 CA BIT7 # AT THE BEGINNING OF THE LIST THE WORD
042246,000171: 05,3511 00006 EXTEND # ORDER BIT WILL BE SET BACK TO ZERO.
042247,000172: 05,3512 02013 RAND CHAN13
042248,000173: 05,3513 10000 CCS A
042249,000174: 05,3514 00335 TC DNTMGOTO
042250,000175: 05,3515 06022 TC C13STALL
042251,000176: 05,3516 34745 CA BIT7
042252,000177: 05,3517 00006 EXTEND # SET WORD ORDER BIT TO 1 ONLY IF IT
042253,000178: 05,3520 05013 WOR CHAN13 # ALREADY ISN'T.
042254,000179: 05,3521 00335 TC DNTMGOTO # GOTO APPROPRIATE PHASE OF PROGRAM
042255,000180:
042256,000181: 05,2000 SETLOC DOWNTELM
042257,000182: 05,2000 BANK
042258,000183:
042259,000184: 05,3522 37752 DNPHASE1 CA NEGONE # INITIALIZE ALL CONTROL WORDS
042260,000185: 05,3523 54337 TS SUBLIST # WORDS TO MINUS ONE
042261,000186: 05,3524 54336 TS DNECADR
042262,000187: 05,3525 33652 CA LDNPHAS2 # SET DNTMGOTO =O ALL SUBSEQUENT DOWNRUPTS
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Page 986 |
042264,000189: 05,3526 54335 TS DNTMGOTO # GO TO DNPHASE2
042265,000190: 05,3527 13543 TCF NEWLIST
042266,000191: 05,3530 10336 DNPHASE2 CCS DNECADR # SENDING OF DATA IN PROGRESS
042267,000192: 05,3531 03665 DODNADR TC FETCH2WD # YES - THEN FETCH THE NEXT 2 SP WORDS
042268,000193: 05,3532 77753 MINTIME2 -1DNADR TIME2 # NEGATIVE OF TIME2 1DNADR
042269,000194: 05,3533 13534 TCF +1 # (ECADR OF 3776 + 74001 = 77777)
042270,000195:
042271,000196: 05,3534 10337 CCS SUBLIST # IS THE SUBLIST IN CONTROL
042272,000197: 05,3535 13700 TCF NEXTINSL # YES
042273,000198: 05,3536 74001 DNADRDCR OCT 74001 # DNADR COUNT AND ECADR DECREMENTER
042274,000199:
042275,000200: 05,3537 30334 CHKLIST CA CTLIST
042276,000201: 05,3540 00006 EXTEND
042277,000202: 05,3541 63543 BZMF NEWLIST # IT WILL BE NEGATIVE AT END OF LIST
042278,000203: 05,3542 13550 TCF NEXTINCL
042279,000204: 05,3543 50333 NEWLIST INDEX DNLSTCOD
042280,000205: 05,3544 32441 CA DNTABLE # INITIALIZE CTLIST WITH
042281,000206: 05,3545 54334 TS CTLIST # STARTING ADDRESS OF NEW LIST
042282,000207: 05,3546 40333 CS DNLSTCOD
042283,000208: 05,3547 13767 TCF SENDID +3
042284,000209: 05,3550 50334 NEXTINCL INDEX CTLIST
042285,000210: 05,3551 30000 CA 0
042286,000211: 05,3552 10000 CCS A
042287,000212: 05,3553 24334 INCR CTLIST # SET POINTER TO PICK UP NEXT CTLIST WORD
042288,000213: 05,3554 13560 TCF +4 # ON NEXT ENTRY TO PROG. (A SHOULD NOT =0)
042289,000214: 05,3555 56334 XCH CTLIST # SET CTLIST TO NEGATIVE AND PLACE(CODING)
042290,000215: 05,3556 40000 COM # UNCOMPLEMENTED DNADR INTO A. (FOR LA)
042291,000216: 05,3557 56334 XCH CTLIST # (ST IN )
042292,000217: 05,3560 24000 +4 INCR A # (CTLIST)
042293,000218: 05,3561 54336 TS DNECADR # SAVE DNADR
042294,000219: 05,3562 63532 AD MINTIME2 # TEST FOR TIME2 (NEG. OF ECADR)
042295,000220: 05,3563 10000 CCS A
042296,000221: 05,3564 13570 TCF SETWO +1 # DON'T SET WORD ORDER CODE
042297,000222: 05,3565 47777 MINB1314 OCT 47777 # MINUS BIT 13 AND 14 (CAN'T GET HERE)
042298,000223: 05,3566 13570 TCF SETWO +1 # DON'T SET WORD ORDER CODE
042299,000224: 05,3567 03612 SETWO TC WOZERO # GO SET WORD ORDER CODE TO ZERO.
042300,000225: 05,3570 30336 +1 CA DNECADR # RELOAD A WITH THE DNADR.
042301,000226: 05,3571 63565 +2 AD MINB1314 # IS THIS A REGULAR DNADR?
042302,000227: 05,3572 00006 EXTEND
042303,000228: 05,3573 63665 BZMF FETCH2WD # YES. (A MUST NEVER BE ZERO)
042304,000229: 05,3574 67744 AD MINB12 # NO- IS IT A POINTER (DNPTR) OR A
042305,000230: 05,3575 00006 EXTEND # CHANNEL(DNCHAN)
042306,000231: 05,3576 63623 BZMF DODNPTR # IT'S A POINTER. (A MUST NEVER BE ZERO)
042307,000232:
042308,000233: 05,3577 00006 DODNCHAN TC 6 # (EXECUTED AS EXTEND) IT S A CHANNEL
042309,000234: 05,3600 50336 INDEX DNECADR
042310,000235: 05,3601 44000 INDEX 0 -4000 # (EXECUTED AS READ)
042311,000236: 05,3602 54001 TS L
042312,000237: 05,3603 00006 TC 6 # (EXECUTED AS EXTEND)
042313,000238: 05,3604 50336 INDEX DNECADR
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Page 987 |
042315,000240: 05,3605 43777 INDEX 0 -4001 # (EXECUTED AS READ)
042316,000241: 05,3606 54336 TS DNECADR # SET DNECADR
042317,000242: 05,3607 37752 CA NEGONE # TO MINUS
042318,000243: 05,3610 56336 XCH DNECADR # WHILE PRESERVING A.
042319,000244: 05,3611 13713 TCF DNTMEXIT # GO SEND CHANNELS
042320,000245:
042321,000246: 05,3612 00006 WOZERO EXTEND
042322,000247: 05,3613 23265 QXCH C13QSAV
042323,000248: 05,3614 22070 LXCH RUPTREG1
042324,000249: 05,3615 06022 TC C13STALL
042325,000250:
042326,000251: 05,3616 22070 LXCH RUPTREG1
042327,000252: 05,3617 44745 CS BIT7
042328,000253: 05,3620 00006 EXTEND
042329,000254: 05,3621 03013 WAND CHAN13 # SET WORD ORDER CODE TO ZERO
042330,000255: 05,3622 01265 TC C13QSAV
042331,000256:
042332,000257: 05,3623 50336 DODNPTR INDEX DNECADR # DNECADR CONTAINS ADRES OF SUBLIST
042333,000258: 05,3624 00000 0 0 # CLEAR AND ADD LIST ENTRY INTO A.
042334,000259: 05,3625 10000 CCS A # IS THIS A SNAPSHOT SUBLIST
042335,000260: 05,3626 30336 CA DNECADR # NO, IT IS A REGULAR SUBLIST.
042336,000261: 05,3627 13677 TCF DOSUBLST # A MUST NOT BE ZERO.
042337,000262:
042338,000263: 05,3630 56336 XCH DNECADR # YES, IT IS A SNAPSHOT SUBLIST.
042339,000264: 05,3631 54337 TS SUBLIST # C(DNECADR) INTO SUBLIST
042340,000265: 05,3632 34755 CAF ZERO # A INTO A
042341,000266: 05,3633 56336 XCH TMINDEX # (NOTE.. TMINDEX = DNECADR)
042342,000267:
042343,000268: # THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND) IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
042344,000269: # THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
042345,000270: # THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
042346,000271: # TO MINIMIZE TIME. THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
042347,000272: # THESE RULES ARE ......
042348,000273: # 1. ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
042349,000274: # 2. THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY BANK.
042350,000275:
042351,000276: 05,3634 54003 SNAPLOOP TS EBANK # SET EBANK
042352,000277: 05,3635 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS
042353,000278: 05,3636 00006 EXTEND
042354,000279: 05,3637 50000 INDEX A
042355,000280: 05,3640 E3,1401 EBANK= 1401
042356,000281: 05,3640 31402 DCA 1401 # PICK UP 2 SNAPSHOT WORDS.
042357,000282: 05,3641 0340 EBANK= DNTMBUFF
042358,000283: 05,3641 50336 INDEX TMINDEX
042359,000284: 05,3642 52341 DXCH DNTMBUFF # STORE 2 SNAPSHOT WORDS IN BUFFER
042360,000285: 05,3643 24336 INCR TMINDEX # SET BUFFER INDEX FOR NEXT 2 WORDS.
042361,000286: 05,3644 24336 INCR TMINDEX
042362,000287: 05,3645 24337 SNAPAGN INCR SUBLIST # SET POINTER TO NEXT 2 WORDS OF SNAPSHOT
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Page 988 |
042364,000289: 05,3646 50337 INDEX SUBLIST
042365,000290: 05,3647 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
042366,000291: 05,3650 10000 CCS A # TEST FOR LAST TWO WORDS OF SNAPSHOT.
042367,000292: 05,3651 13634 TCF SNAPLOOP # NOT LAST TWO.
042368,000293: 05,3652 03530 LDNPHAS2 GENADR DNPHASE2
042369,000294: 05,3653 54337 TS SUBLIST # YES, LAST. SAVE A.
042370,000295: 05,3654 37752 CA NEGONE # SET DNECADR AND
042371,000296: 05,3655 54336 TS DNECADR # SUBLIST POINTERS
042372,000297: 05,3656 56337 XCH SUBLIST # TO NEGATIVE VALUES.
042373,000298: 05,3657 54003 TS EBANK
042374,000299: 05,3660 74357 MASK LOW8
042375,000300: 05,3661 00006 EXTEND
042376,000301: 05,3662 50000 INDEX A
042377,000302: 05,3663 E3,1401 EBANK= 1401
042378,000303: 05,3663 31402 DCA 1401 # PICK UP FIRST 2 WORDS OF SNAPSHOT.
042379,000304: 05,3664 0340 EBANK= DNTMBUFF
042380,000305: 05,3664 13713 SNAPEND TCF DNTMEXIT # NOW GO SEND THEM.
042381,000306:
042382,000307: 05,3665 30336 FETCH2WD CA DNECADR
042383,000308: 05,3666 54003 TS EBANK # SET EBANK
042384,000309: 05,3667 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS
042385,000310: 05,3670 54001 TS L
042386,000311: 05,3671 33536 CA DNADRDCR # DECREMENT COUNT AND ECADR
042387,000312: 05,3672 26336 ADS DNECADR
042388,000313: 05,3673 00006 EXTEND
042389,000314: 05,3674 50001 INDEX L
042390,000315: 05,3675 E3,1400 EBANK= 1400
042391,000316: 05,3675 31401 DCA 1400 # PICK UP 2 DATA WORDS
042392,000317: 05,3676 0340 EBANK= DNTMBUFF
042393,000318: 05,3676 13713 TCF DNTMEXIT # NOW GO SEND THEM.
042394,000319:
042395,000320: 05,3677 54337 DOSUBLST TS SUBLIST # SET SUBLIST POINTER
042396,000321: 05,3700 50337 NEXTINSL INDEX SUBLIST
042397,000322: 05,3701 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
042398,000323: 05,3702 10000 CCS A # IS IT THE END OF THE SUBLIST
042399,000324: 05,3703 24337 INCR SUBLIST # NO -
042400,000325: 05,3704 13710 TCF +4
042401,000326: 05,3705 54337 TS SUBLIST # SAVE A.
042402,000327: 05,3706 37752 CA NEGONE # SET SUBLIST TO MINUS
042403,000328: 05,3707 56337 XCH SUBLIST # RETRIEVE A.
042404,000329: 05,3710 24000 +4 INCR A
042405,000330: 05,3711 54336 TS DNECADR # SAVE DNADR
042406,000331: 05,3712 13571 TCF SETWO +2 # GO USE COMMON CODING (PROBLEMS WOULD
042407,000332: # OCCUR IF THE PROGRAM ENCOUNTERED A
042408,000333: # DNPTR NOW)
042409,000334:
042410,000335: 05,3713 00006 DNTMEXIT EXTEND # DOWN-TELEMETRY EXIT
042411,000336: 05,3714 01034 WRITE DNTM1 # TO SEND A + L TO CHANNELS 34 + 35
042412,000337: 05,3715 30001 CA L # RESPECTIVELY
042413,000338: 05,3716 00006 TMEXITL EXTEND
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Page 989 |
042415,000340: 05,3717 01035 WRITE DNTM2
042416,000341: 05,3720 15270 TMRESUME TCF RESUME # EXIT TELEMETRY PROGRAM VIA RESUME.
042417,000342:
042418,000343: 05,3721 7744 MINB12 EQUALS -1/8
042419,000344: 05,3721 0336 DNECADR EQUALS TMINDEX
042420,000345: 05,3721 0334 CTLIST EQUALS LDATALST
042421,000346: 05,3721 0337 SUBLIST EQUALS DNQ
042422,000347:
042423,000348: # MOD BY - DENSMORE - JUNE 1969 - ELIMINATE ERASABLE DUMP COUNT
042424,000349:
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Page 990 |
042426,000351: # SUBROUTINE NAME - DNDUMP
042427,000352:
042428,000353: # FUNCTIONAL DESCRIPTION - TO SEND (DUMP) ALL 8 BANKS OF ERASABLE STORAGE TWICE. BANKS ARE SENT ONE AT A TIME
042429,000354: # EACH BANK IS PRECEEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
042430,000355: # EBANK. EBANKS ARE DUMPED IN ORDER (I.E. EBANK 0 FIRST, THEN EBANK1 ETC.)
042431,000356:
042432,000357: # CALLING SEQUENCE - THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
042433,000358: # AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
042434,000359: # WILL BEGIN.
042435,000360:
042436,000361: # ONCE INITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
042437,000362: # BY THE FOLLOWING:
042438,000363:
042439,000364: # 1. A FRESH START
042440,000365: # 2. COMPLETION OF BOTH COMPLETE DUMPS
042441,000366: # 3. AND INVOLUNTARILY BY A RESTART.
042442,000367:
042443,000368: # NORMAL EXIT MODE - TCF DNPHASE1
042444,000369:
042445,000370: # ALARM OR ABORT MODE - NONE
042446,000371:
042447,000372: # *SUBROUTINES CALLED - NONE.
042448,000373:
042449,000374: # ERASABLE INITIALIZATION REQUIRED -
042450,000375: # NONE
042451,000376:
042452,000377: # DEBRIS - DUMPLOC, DUMPSW, DNTMGOTO, EBANK AND CENTRAL REGISTERS
042453,000378:
042454,000379: # TIMING - TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)*(WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
042455,000380: # TIME (IN SECS) = ( 4 )*( 8 )*( 256 + 4 ) / 100
042456,000381: # THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
042457,000382:
042458,000383: # STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM -
042459,000384: # (REMINDER - THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
042460,000385:
042461,000386: # DOWNLIST W
042462,000387: # WORD TAKEN FROM CONTENTS OF EXAMPLE O COMMENTS
042463,000388: # 1 ERASID 0177X 0 DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
042464,000389: # 2 LOWIDCOD 77340 1 DOWNLINK SYNCH BITS. (SAME ONE USED IN ALL OTHER DOWNLISTS)
042465,000390: # 3 DUMPLOC 13400 1 (SEE NOTES ON DUMPLOC) 1 = 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
042466,000391: # 4 TIME1 14120 1 TIME IN CENTISECONDS
042467,000392: # 5 FIRST WORD OF EBANK X 03400 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
042468,000393: # 6 2ND WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
042469,000394: # 7 3RD WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
042470,000395: # . 1
042471,000396: # . 1
042472,000397: # . 1
042473,000398: # 260D 256TH WORD OF EBANK X 03777 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
042474,000399:
042475,000400: # NOTE - DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
042476,000401: # THE BIT STRUCTURE OF DUMPLOC IS FOLLOWS---
042477,000402: # X = NOT USED
042478,000403: # X ABC EEE RRRRRRRR ABC = ERASABLE DUMP COUNTER (I.E. ABC = 0,1,2 OR 3 WHICH MEANS THAT
042479,000404: # COMPLETE ERASABLE DUMP NUMBER 1,2,3 OR 4 RESPECTIVELY IS IN PROGRESS)
042480,000405: # EEE = EBANK BITS
042481,000406: # RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK.
042482,000407:
042483,000408: 05,3721 34755 DNDUMPI CA ZERO # INITIALIZE DOWNLINK
042484,000409: 05,3722 54336 TS DUMPLOC # ERASABLE DUMP
042485,000410: 05,3723 03764 +2 TC SENDID # GO SEND ID AND SYNCH BITS
042486,000411:
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Page 991 |
042488,000413: 05,3724 33733 CA LDNDUMP1 # SET DNTMGOTO
042489,000414: 05,3725 54335 TS DNTMGOTO # TO LOCATION FOR NEXT PASS
042490,000415: 05,3726 30025 CA TIME1 # PLACE TIME1
042491,000416: 05,3727 56001 XCH L # INTO L
042492,000417: 05,3730 30336 CA DUMPLOC # AND ECADR OF THIS EBANK INTO A
042493,000418: 05,3731 13713 TCF DNTMEXIT # SEND DUMPLOC AND TIME1
042494,000419:
042495,000420: 05,3732 03734 LDNDUMP ADRES DNDUMP
042496,000421: 05,3733 03746 LDNDUMP1 ADRES DNDUMP1
042497,000422:
042498,000423: 05,3734 34752 DNDUMP CA TWO # INCREMENT ECADR IN DUMPLOC
042499,000424: 05,3735 26336 ADS DUMPLOC # TO NEXT DP WORD TO BE
042500,000425: 05,3736 74357 MASK LOW8 # DUMPED AND SAVE IT.
042501,000426: 05,3737 10000 CCS A # IS THIS THE BEGINNING OF A NEW EBANK
042502,000427: 05,3740 13750 TCF DNDUMP2 # NO - THEN CONTINUE DUMPING
042503,000428: 05,3741 30336 CA DUMPLOC # YES - IS THIS THE END OF THE
042504,000429: 05,3742 74737 MASK BIT13 # SECOND COMPLETE ERASABLE DUMP?
042505,000430: 05,3743 00006 EXTEND
042506,000431: 05,3744 13723 BZF DNDUMPI +2 # NO - GO BACK AND INITIALIZE NEXT BANK
042507,000432: 05,3745 13522 TCF DNPHASE1 # YES - SEND DOWNLIST AGAIN
042508,000433: 05,3746 33732 DNDUMP1 CA LDNDUMP # SET DNTMGOTO
042509,000434: 05,3747 54335 TS DNTMGOTO # FOR WORDS 3 TO 256D OF CURRENT EBANK
042510,000435:
042511,000436: 05,3750 30336 DNDUMP2 CA DUMPLOC
042512,000437: 05,3751 54003 TS EBANK # SET EBANK
042513,000438: 05,3752 74357 MASK LOW8 # ISOLATE RELATIVE ADDRESS.
042514,000439: 05,3753 54002 TS Q # (NOTE: MASK INSTRUCTION IS USED TO PICK
042515,000440: 05,3754 34754 CA NEG0 # UP ERASABLE REGISTERS SO THAT EDITING
042516,000441: 05,3755 54001 TS L # REGISTERS 20-23 WILL NOT BE ALTERED.)
042517,000442: 05,3756 50002 INDEX Q
042518,000443: 05,3757 E3,1400 EBANK= 1400 # PICK UP LOW ORDER REGISTER OF PAIR
042519,000444: 05,3757 71401 MASK 1401 # OF ERASABLE REGISTERS.
042520,000445: 05,3760 56001 XCH L
042521,000446: 05,3761 50002 INDEX Q # PICK UP HIGH ORDER REGISTER OF PAIR
042522,000447: 05,3762 71400 MASK 1400 # OF ERASABLE REGISTERS.
042523,000448: 05,3763 0340 EBANK= DNTMBUFF
042524,000449: 05,3763 13713 TCF DNTMEXIT # GO SEND THEM
042525,000450:
042526,000451: 05,3764 00006 SENDID EXTEND # ** ENTRANCE USED BY ERASABLE DUMP PROG. **
042527,000452: 05,3765 22335 QXCH DNTMGOTO # SET DNTMGOTO SO NEXT TIME PROG WILL GO
042528,000453: 05,3766 35011 CAF ERASID # TO LOCATION FOLLOWING :TC SENDID:
042529,000454:
042530,000455: 05,3767 54001 TS L # ** ENTRANCE USED BY REGULAR DOWNLINK PG **
042531,000456: 05,3770 03612 TC WOZERO # GO SET WORD ORDER CODE TO ZERO
042532,000457: 05,3771 32065 CAF LOWIDCOD # PLACE SPECIAL ID CODE INTO L
042533,000458: 05,3772 56001 XCH L # AND ID BACK INTO A
042534,000459: 05,3773 13713 TCF DNTMEXIT # SEND DOWNLIST ID CODE(S).
042535,000460:
End of include-file DOWN-TELEMETRY_PROGRAM.agc. Parent file is MAIN.agc