Source Code
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These source-code files are part of a reconstructed copy of Comanche 51, the
initial release (though not the final mission release) of the Apollo 11
Command Module (CM) Apollo Guidance Computer (AGC) software. The flown, final
release was Comanche 55. The reconstruction is believed to be exactly accurate,
but in the absence of an actual Apollo-era listing of Comanche 51, some
explanation of the reconstruction process is needed to insure confidence in
that accuracy.
The starting point was the source code of Comanche 55, whose original source code
is available. Comanche 55 source code was then modified by undoing changes known
to have been made between revisions 51 and 55. The most-significant steps involved
reverting changes related to the R-2 lunar potential model, the details of which
were known from the previous, separate, independent reconstruction of the Apollo 10
Lunar Module software Luminary 69/2. The now-reconstructed
Comanche 51 source code was verified by assembling it and checking that the assembled
code had the expected known-correct memory-bank checksums. Note that page numbers in
the reconstructed code match those on the Comanche 55 or Luminary 69 printouts, although
the source code would likely have different page numbers in a contemporary Comanche 51 listing.
Annotations that were not present in the contemporary source code have been added to
the reconstructed code to justify each change relative to Comanche 55. Here's a guide
to some of the Apollo documentation relevant to those annotations:
Among documentation not actually referenced in the annotations, there is
a short writeup about the reconstruction process in our software repository
that may be helpful in understanding it from a different perspective. There's also
a handy table
that lists what the number of memory-words should be for each routine in Comanche 51,
which could make a nice double-check; however, we've not performed that double-check ourselves.
Comments expected to have been present in 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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047412,000002: ## Copyright: Public domain.
047413,000003: ## Filename: DOWN-TELEMETRY_PROGRAM.agc
047414,000004: ## Purpose: A section of Comanche revision 051.
047415,000005: ## It is part of the reconstructed source code for the
047416,000006: ## original release of the flight software for the Command
047417,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 11.
047418,000008: ## The code has been recreated from a copy of Comanche 055. It
047419,000009: ## has been adapted such that the resulting bugger words
047420,000010: ## exactly match those specified for Comanche 51 in NASA drawing
047421,000011: ## 2021153D, which gives relatively high confidence that the
047422,000012: ## reconstruction is correct.
047423,000013: ## Reference: pp. 1093-1102
047424,000014: ## Assembler: yaYUL
047425,000015: ## Contact: Ron Burkey <info@sandroid.org>.
047426,000016: ## Website: www.ibiblio.org/apollo/index.html
047427,000017: ## Mod history: 2019-07-30 MAS Created from Comanche 55.
047428,000018:
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Page 1093
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047430,000020: # PROGRAM NAME - DOWN TELEMETRY PROGRAM
047431,000021: # MOD NO. - 0 TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
047432,000022: # PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
047433,000023: # THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS. REFER TO DOWNLINK
047434,000024: # LISTS LOG SECTION FOR MORE DETAILS. HOWEVER THIS CHANGE WILL NOT AFFECT THE GROUND PROCESSING
047435,000025: # OF DOWN TELEMETRY DATA.
047436,000026: # MOD BY - KILROY, SMITH, DEWITT
047437,000027: # DATE - 02 OCT 67
047438,000028: # AUTHORS - KILROY, SMITH, DEWITT, DEWOLF, FAGIN
047439,000029: # LOG SECTION - DOWN-TELEMETRY PROGRAM
047440,000030:
047441,000031: # FUNCTIONAL DESCRIPTION - THIS ROUTINE IS INITIATED BY TELEMETRY END
047442,000032: # PULSE FROM THE DOWNLINK TELEMETRY CONVERTER. THIS PULSE OCCURS
047443,000033: # AT 50 TIMES PER SEC (EVERY 20 MS) THEREFORE DODOWNTM IS
047444,000034: # EXECUTED AT THESE RATES. THIS ROUTINE SELECTS THE APPROPRIATE
047445,000035: # AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
047446,000036: # CHANNELS 34 AND 35. THE INFORMATION IS THEN GATED OUT FROM THE
047447,000037: # LGC IN SERIAL FASHION.
047448,000038:
047449,000039: # THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST. SINCE DOWNRUPTS
047450,000040: # OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
047451,000041: # CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
047452,000042: # OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
047453,000043:
047454,000044: # CALLING SEQUENCE - NONE
047455,000045: # PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
047456,000046: # RESULT OF A DOWNRUPT. CONTROL IS RETURNED VIA TCF RESUME WHICH
047457,000047: # IN EFFECT IS A RESUME.
047458,000048:
047459,000049: # SUBROUTINES CALLED - NONE
047460,000050:
047461,000051: # NORMAL EXIT MODE - TCF RESUME
047462,000052:
047463,000053: # ALARM OR ABORT EXIT MODE - NONE
047464,000054:
047465,000055: # RESTART PROTECTION:
047466,000056: # ON A FRESH START AND RESTART THE 'STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER (ACTUALLY
047467,000057: # DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST (I.E. CURRENT CONTENTS OF DNLSTADR). THIS HAS THE
047468,000058: # EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
047469,000059: # THE RESTART (OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
047470,000060: # DOWNLIST.
047471,000061:
047472,000062: # ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
047473,000063:
047474,000064: # DOWNLINK LIST SELECTION:
047475,000065: # THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
047476,000066: # 1. FRESH START
047477,000067: # 2. V37EXXE WHERE XX = THE MAJOR MODE BEING SELECTED.
047478,000068: # 3. UPDATE PROGRAM (P27)
047479,000069: # 4. NON-V37 SELECTABLE TYPE PROGRAMS (E.G. AGS INITIALIZATION (SUNDANCE, LUMINARY) AND P61-P62
047480,000070: # TRANSITION (COLOSSUS) ETC.).
047481,000071:
047482,000072: # DOWNLINK LIST RULES AND LIMITATIONS:
047483,000073: # READ SECTION(S) WHICH FOLLOW 'DEBRIS' WRITEUP.
047484,000074:
047485,000075: # OUTPUT - EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS (I.E. 200 LGC
047486,000076: # COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
047487,000077:
047488,000078: # ERASABLE INITIALIZATION REQUIRED - NONE
047489,000079: # 'DNTMGOTO' AND 'DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
047490,000080:
047491,000081: # DEBRIS (ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM) -
047492,000082: # LDATALST, DNTMBUFF TO DNTMBUFF +21D, TMINDEX, DNQ.
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Page 1094
No source on this page of the original assembly listing.
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047495,000085:
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Page 1095
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047497,000087: # DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
047498,000088: # RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
047499,000089:
047500,000090: # NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
047501,000091: # 1. DOWNLISTS. - DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
047502,000092: # DOWN-TELEMETRY PROGRAM. THIS IS DONE FOR EASE OF CODING, FASTER
047503,000093: # EXECUTION.
047504,000094: # 2. EACH DOWNLINK LIST CONSISTS OF A CONTROL LIST AND A NUMBER OF
047505,000095: # SUBLISTS.
047506,000096: # 3. A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
047507,000097: # DOWNLINK LISTS. ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
047508,000098: # CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
047509,000099: # 4. SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENOUS DATA WHICH MUST BE
047510,000100: # SAVED IN A BUFFER DURING ONE DOWNRUPT.
047511,000101: # 5. THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
047512,000102: # OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
047513,000103: # IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
047514,000104: # 6. ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
047515,000105: # CREATED FOR THE DOWNLIST PROGRAM.
047516,000106: # A. 1DNADR 1-WORD DOWNLIST ADDRESS.
047517,000107: # SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
047518,000108: # HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
047519,000109: # B. 2DNADR - 6DNADR N-WORD DOWNLIST ADDRESS, N = 2 - 6.
047520,000110: # SAME AS 1DNADR, BUT WITH THE 4 UNUSED BITS OF THE ECADR FORMAT
047521,000111: # FILLED IN WITH 0001-0101. USED TO POINT TO A LIST OF N DOUBLE-
047522,000112: # PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
047523,000113: # C. DNCHAN DOWNLIST CHANNEL ADDRESS.
047524,000114: # SAME AS 1DNADR, BUT WITH PREFIX BITS 0111. USED TO POINT TO
047525,000115: # A PAIR OF CHANNELS FOR DOWN TELEMETRY.
047526,000116: # D. DNPTR DOWN TELEMETRY SUBLIST POINTER.
047527,000117: # SAME AS CAF BUT TAGGED AS A CONSTANT. USED IN CONTROL LIST TO POINT TO A SUBLIST.
047528,000118: # CAUTION --- A DNPTR CANNOT BE USED IN A SUBLIST.
047529,000119: # 7. THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E. CONTROL LIST) AND WHEN
047530,000120: # A '1DNADR TIME2' IS DETECTED IN THE CONTROL LIST (ONLY).
047531,000121: # 8. IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
047532,000122:
047533,000123: # DOWNLINK LIST RESTRICTIONS:
047534,000124: # (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO IT IS CLEAR THAT THESE THINGS CANNOT BE
047535,000125: # DONE)
047536,000126: # 1. SNAPSHOT DOWNLIST:
047537,000127: # (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E. 1DNADR'S): 0, 400, 1000, 1400, 2000, 2400, 3000, 3400.
047538,000128: # (B) CAN CONTAIN ONLY 1DNADR'S
047539,000129: # 2. ALL DOWNLINKED DATA (EXCEPT CHANNELS) IS PICKED UP BY A <DCA<SO DOWNLINK LISTS CANNOT CONTAIN THE
047540,000130: # EQUIVALENT OF THE FOLLOWING ECADRS (I.E. IDNADRS): 377, 777, 1377, 1777, 2377, 27777, 3377, 3777.
047541,000131: # (NOTE: THE TERM EQUIVALENT ' MEANT THAT THE IDNADR TO 6DNADR WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
047542,000132: # 3. CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777
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Page 1096
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047544,000134: # 4. THE '1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINK PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
047545,000135: # CONTROL SECTION OF THE DOWNLIST.
047546,000136: # 5. 'DNCHAN 0' CANNOT BE USED.
047547,000137: # 6. 'DNPTR 0' CANNOT BE USED.
047548,000138: # 7. DNPTR CANNOT APPEAR IN A SUBLIST.
047549,000139:
047550,000140: # EBANK SETTINGS
047551,000141: # IN THE PROCESS OF SETTING THE EBANK (WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
047552,000142: # 'GARBAGE' INTO BITS15-12 OF EBANK. HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
047553,000143: # SIGNIFICANT SOMEDAY IN THE FUTURE. IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE (BY MASKING ETC.)
047554,000144: # THAT BITS 15-12 OF EBANK ARE ZERO.
047555,000145:
047556,000146: # INITIALIZATION REQUIRED - TO INTERRUPT CURRENT LIST AND START A NEW ONE..
047557,000147: # 1. ADRES OF DOWNLINK LIST INTO DNLSTADR
047558,000148: # 2. NEGONE INTO SUBLIST
047559,000149: # 3. NEGONE INTO DNECADR
047560,000150:
047561,000151: 22,3510 BANK 22
047562,000152: 05,2000 SETLOC DOWNTELM
047563,000153: 05,2000 BANK
047564,000154:
047565,000155: 05,3521 0340 EBANK= DNTMBUFF
047566,000156:
047567,000157: 05,3521 COUNT 05/DPROG
047568,000158:
047569,000159: 05,3521 54016 DODOWNTM TS BANKRUPT
047570,000160: 05,3522 00006 EXTEND
047571,000161: 05,3523 22012 QXCH QRUPT # SAVE Q
047572,000162: 05,3524 35011 CA BIT7 # SET WORD ORDER CODE TO 1. EXCEPTION- AT
047573,000163: 05,3525 00006 EXTEND # THE BEGINNING OF EACH LIST THE WORD
047574,000164: 05,3526 05013 WOR CHAN13 # CODE WILL BE SET BACK TO 0.
047575,000165: 05,3527 00335 TC DNTMGOTO # GOTO APPROPRIATE PHASE OF PROGRAM
047576,000166:
047577,000167: 05,3530 37716 DNPHASE1 CA NEGONE # INITIALIZE ALL CONTROL WORDS
047578,000168: 05,3531 54337 TS SUBLIST # WORDS TO MINUS ONE
047579,000169: 05,3532 54336 TS DNECADR
047580,000170: 05,3533 33653 CA LDNPHAS2 # SET DNTMGOTO =O ALL SUBSEQUENT DOWNRUPTS
047581,000171: 05,3534 54335 TS DNTMGOTO # GO TO DNPHASE2
047582,000172: 05,3535 13551 TCF NEWLIST
047583,000173: 05,3536 10336 DNPHASE2 CCS DNECADR # SENDING OF DATA IN PROGRESS
047584,000174: 05,3537 03666 DODNADR TC FETCH2WD # YES - THEN FETCH THE NEXT 2 SP WORDS
047585,000175: 05,3540 77753 MINTIME2 -1DNADR TIME2 # NEGATIVE OF TIME2 1DNADR
047586,000176: 05,3541 13542 TCF +1 # (ECADR OF 3776 + 74001 = 77777)
047587,000177:
047588,000178: 05,3542 10337 CCS SUBLIST # IS THE SUBLIST IN CONTROL
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Page 1097
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047590,000180: 05,3543 13701 TCF NEXTINSL # YES
047591,000181: 05,3544 74001 DNADRDCR OCT 74001 # DNADR COUNT AND ECADR DECREMENTER
047592,000182:
047593,000183: 05,3545 30334 CHKLIST CA CTLIST
047594,000184: 05,3546 00006 EXTEND
047595,000185: 05,3547 63551 BZMF NEWLIST # IT WILL BE NEGATIVE AT END OF LIST
047596,000186: 05,3550 13556 TCF NEXTINCL
047597,000187: 05,3551 50332 NEWLIST INDEX DNLSTCOD
047598,000188: 05,3552 32335 CA DNTABLE # INITIALIZE CTLIST WITH
047599,000189: 05,3553 54334 TS CTLIST # STARTING ADDRESS OF NEW LIST
047600,000190: 05,3554 40332 CS DNLSTCOD
047601,000191: 05,3555 13771 TCF SENDID +3
047602,000192: 05,3556 50334 NEXTINCL INDEX CTLIST
047603,000193: 05,3557 30000 CA 0
047604,000194: 05,3560 10000 CCS A
047605,000195: 05,3561 24334 INCR CTLIST # SET POINTER TO PICK UP NEXT CTLIST WORD
047606,000196: 05,3562 13566 TCF +4 # ON NEXT ENTRY TO PROG. (A SHOULD NOT =0)
047607,000197: 05,3563 56334 XCH CTLIST # SET CTLIST TO NEGATIVE AND PLACE(CODING)
047608,000198: 05,3564 40000 COM # UNCOMPLEMENTED DNADR INTO A. (FOR LA)
047609,000199: 05,3565 56334 XCH CTLIST # (ST IN )
047610,000200: 05,3566 24000 +4 INCR A # (CTLIST)
047611,000201: 05,3567 54336 TS DNECADR # SAVE DNADR
047612,000202: 05,3570 63540 AD MINTIME2 # TEST FOR TIME2 (NEG. OF ECADR)
047613,000203: 05,3571 10000 CCS A
047614,000204: 05,3572 13576 TCF SETWO +1 # DON'T SET WORD ORDER CODE
047615,000205: 05,3573 47777 MINB1314 OCT 47777 # MINUS BIT 13 AND 14 (CAN'T GET HERE)
047616,000206: 05,3574 13576 TCF SETWO +1 # DON'T SET WORD ORDER CODE
047617,000207: 05,3575 03620 SETWO TC WOZERO # GO SET WORD ORDER CODE TO ZERO.
047618,000208: 05,3576 30336 +1 CA DNECADR # RELOAD A WITH THE DNADR.
047619,000209: 05,3577 63573 +2 AD MINB1314 # IS THIS A REGULAR DNADR?
047620,000210: 05,3600 00006 EXTEND
047621,000211: 05,3601 63666 BZMF FETCH2WD # YES. (A MUST NEVER BE ZERO)
047622,000212: 05,3602 67710 AD MINB12 # NO- IS IT A POINTER (DNPTR) OR A
047623,000213: 05,3603 00006 EXTEND # CHANNEL(DNCHAN)
047624,000214: 05,3604 63624 BZMF DODNPTR # IT'S A POINTER. (A MUST NEVER BE ZERO)
047625,000215:
047626,000216: 05,3605 00006 DODNCHAN TC 6 # (EXECUTED AS EXTEND) IT S A CHANNEL
047627,000217: 05,3606 50336 INDEX DNECADR
047628,000218: 05,3607 44000 INDEX 0 -4000 # (EXECUTED AS READ)
047629,000219: 05,3610 54001 TS L
047630,000220: 05,3611 00006 TC 6 # (EXECUTED AS EXTEND)
047631,000221: 05,3612 50336 INDEX DNECADR
047632,000222: 05,3613 43777 INDEX 0 -4001 # (EXECUTED AS READ)
047633,000223: 05,3614 54336 TS DNECADR # SET DNECADR
047634,000224: 05,3615 37716 CA NEGONE # TO MINUS
047635,000225: 05,3616 56336 XCH DNECADR # WHILE PRESERVING A.
047636,000226: 05,3617 13714 TCF DNTMEXIT # GO SEND CHANNELS
047637,000227:
047638,000228: 05,3620 45011 WOZERO CS BIT7
047639,000229: 05,3621 00006 EXTEND
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Page 1098
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047641,000231: 05,3622 03013 WAND CHAN13 # SET WORD ORDER CODE TO ZERO
047642,000232: 05,3623 00002 TC Q # RETURN TO CALLER
047643,000233:
047644,000234: 05,3624 50336 DODNPTR INDEX DNECADR # DNECADR CONTAINS ADRES OF SUBLIST
047645,000235: 05,3625 00000 0 0 # CLEAR AND ADD LIST ENTRY INTO A.
047646,000236: 05,3626 10000 CCS A # IS THIS A SNAPSHOT SUBLIST
047647,000237: 05,3627 30336 CA DNECADR # NO, IT IS A REGULAR SUBLIST.
047648,000238: 05,3630 13700 TCF DOSUBLST # A MUST NOT BE ZERO.
047649,000239:
047650,000240: 05,3631 56336 XCH DNECADR # YES, IT IS A SNAPSHOT SUBLIST.
047651,000241: 05,3632 54337 TS SUBLIST # C(DNECADR) INTO SUBLIST
047652,000242: 05,3633 35021 CAF ZERO # A INTO A
047653,000243: 05,3634 56336 XCH TMINDEX # (NOTE.. TMINDEX = DNECADR)
047654,000244:
047655,000245: # THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND) IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
047656,000246: # THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
047657,000247: # THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
047658,000248: # TO MINIMIZE TIME. THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
047659,000249: # THESE RULES ARE ......
047660,000250: # 1. ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
047661,000251: # 2. THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY BANK.
047662,000252:
047663,000253: 05,3635 54003 SNAPLOOP TS EBANK # SET EBANK
047664,000254: 05,3636 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS
047665,000255: 05,3637 00006 EXTEND
047666,000256: 05,3640 50000 INDEX A
047667,000257: 05,3641 E3,1401 EBANK= 1401
047668,000258: 05,3641 31402 DCA 1401 # PICK UP 2 SNAPSHOT WORDS.
047669,000259: 05,3642 0340 EBANK= DNTMBUFF
047670,000260: 05,3642 50336 INDEX TMINDEX
047671,000261: 05,3643 52341 DXCH DNTMBUFF # STORE 2 SNAPSHOT WORDS IN BUFFER
047672,000262: 05,3644 24336 INCR TMINDEX # SET BUFFER INDEX FOR NEXT 2 WORDS.
047673,000263: 05,3645 24336 INCR TMINDEX
047674,000264: 05,3646 24337 SNAPAGN INCR SUBLIST # SET POINTER TO NEXT 2 WORDS OF SNAPSHOT
047675,000265: 05,3647 50337 INDEX SUBLIST
047676,000266: 05,3650 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
047677,000267: 05,3651 10000 CCS A # TEST FOR LAST TWO WORDS OF SNAPSHOT.
047678,000268: 05,3652 13635 TCF SNAPLOOP # NOT LAST TWO.
047679,000269: 05,3653 03536 LDNPHAS2 GENADR DNPHASE2
047680,000270: 05,3654 54337 TS SUBLIST # YES, LAST. SAVE A.
047681,000271: 05,3655 37716 CA NEGONE # SET DNECADR AND
047682,000272: 05,3656 54336 TS DNECADR # SUBLIST POINTERS
047683,000273: 05,3657 56337 XCH SUBLIST # TO NEGATIVE VALUES.
047684,000274: 05,3660 54003 TS EBANK
047685,000275: 05,3661 74373 MASK LOW8
047686,000276: 05,3662 00006 EXTEND
047687,000277: 05,3663 50000 INDEX A
047688,000278: 05,3664 E3,1401 EBANK= 1401
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Page 1099
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047690,000280: 05,3664 31402 DCA 1401 # PICK UP FIRST 2 WORDS OF SNAPSHOT.
047691,000281: 05,3665 0340 EBANK= DNTMBUFF
047692,000282: 05,3665 13714 SNAPEND TCF DNTMEXIT # NOW GO SEND THEM.
047693,000283:
047694,000284: 05,3666 30336 FETCH2WD CA DNECADR
047695,000285: 05,3667 54003 TS EBANK # SET EBANK
047696,000286: 05,3670 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS
047697,000287: 05,3671 54001 TS L
047698,000288: 05,3672 33544 CA DNADRDCR # DECREMENT COUNT AND ECADR
047699,000289: 05,3673 26336 ADS DNECADR
047700,000290: 05,3674 00006 EXTEND
047701,000291: 05,3675 50001 INDEX L
047702,000292: 05,3676 E3,1400 EBANK= 1400
047703,000293: 05,3676 31401 DCA 1400 # PICK UP 2 DATA WORDS
047704,000294: 05,3677 0340 EBANK= DNTMBUFF
047705,000295: 05,3677 13714 TCF DNTMEXIT # NOW GO SEND THEM.
047706,000296:
047707,000297: 05,3700 54337 DOSUBLST TS SUBLIST # SET SUBLIST POINTER
047708,000298: 05,3701 50337 NEXTINSL INDEX SUBLIST
047709,000299: 05,3702 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
047710,000300: 05,3703 10000 CCS A # IS IT THE END OF THE SUBLIST
047711,000301: 05,3704 24337 INCR SUBLIST # NO-
047712,000302: 05,3705 13711 TCF +4
047713,000303: 05,3706 54337 TS SUBLIST # SAVE A.
047714,000304: 05,3707 37716 CA NEGONE # SET SUBLIST TO MINUS
047715,000305: 05,3710 56337 XCH SUBLIST # RETRIEVE A.
047716,000306: 05,3711 24000 +4 INCR A
047717,000307: 05,3712 54336 TS DNECADR # SAVE DNADR
047718,000308: 05,3713 13577 TCF SETWO +2 # GO USE COMMON CODING (PROBLEMS WOULD
047719,000309: # OCCUR IF THE PROGRAM ENCOUNTERED A
047720,000310: # DNPTR NOW)
047721,000311:
047722,000312: 05,3714 00006 DNTMEXIT EXTEND # DOWN-TELEMETRY EXIT
047723,000313: 05,3715 01034 WRITE DNTM1 # TO SEND A + L TO CHANNELS 34 + 35
047724,000314: 05,3716 30001 CA L # RESPECTIVELY
047725,000315: 05,3717 00006 TMEXITL EXTEND
047726,000316: 05,3720 01035 WRITE DNTM2
047727,000317: 05,3721 15333 TMRESUME TCF RESUME # EXIT TELEMETRY PROGRAM VIA RESUME.
047728,000318:
047729,000319: 05,3722 7710 MINB12 EQUALS -1/8
047730,000320: 05,3722 0336 DNECADR EQUALS TMINDEX
047731,000321: 05,3722 0334 CTLIST EQUALS LDATALST
047732,000322: 05,3722 0337 SUBLIST EQUALS DNQ
047733,000323:
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Page 1100
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047735,000325: # SUBROUTINE NAME - DNDUMP
047736,000326:
047737,000327: # FUNCTIONAL DESCRIPTION - TO SEND (DUMP) ALL ERASABLE STORAGE 'N' TIMES.(N = 1 TO 4). BANKS ARE SENT ONE AT A TIME
047738,000328: # EACH BANK IS PRECEEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
047739,000329: # EBANK. EBANKS ARE DUMPED IN ORDER (I.E. EBANK 0 FIRST, THEN EBANK1 ETC.)
047740,000330:
047741,000331: # CALLING SEQUENCE- THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
047742,000332: # AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
047743,000333: # WILL BEGIN.
047744,000334:
047745,000335: # ONCE INITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
047746,000336: # BY THE FOLLOWING:
047747,000337:
047748,000338: # 1. A FRESH START
047749,000339: # 2. COMPLETION OF ALL DOWNLINK DUMPS REQUESTED (ACCORDING TO BITS SET IN DUMPCNT). NOTE THAT DUMPCNT
047750,000340: # CAN BE ALTERED BY A V21N01.
047751,000341: # 3. AND INVOLUNTARILY BY A RESTART.
047752,000342:
047753,000343: # NORMAL EXIT MODE- TCF DNPHASE1
047754,000344:
047755,000345: # ALARM OR ABORT MODE- NONE
047756,000346:
047757,000347: # *SUBROUTINES CALLED- NONE.
047758,000348:
047759,000349: # ERASABLE INITIALIZATION REQUIRED-
047760,000350: # DUMPCNT OCT 20000 IF 4 COMPLETE ERASABLE DUMPS ARE DESIRED
047761,000351: # DUMPCNT OCT 10000 IF 2 COMPLETE ERASABLE DUMPS ARE DESIRED
047762,000352: # DUMPCNT OCT 04000 IF 1 COMPLETE ERASABLE DUMP IS DESIRED
047763,000353:
047764,000354: # DEBRIS- DUMPLOC, DUMPSW, DNTMGOTO, EBANK AND CENTRAL REGISTERS
047765,000355:
047766,000356: # TIMING- TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)*(WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
047767,000357: # TIME (IN SECS) = ( 4 )*( 8 )*( 256 + 4 ) / 100
047768,000358: # THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
047769,000359:
047770,000360: # STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM-
047771,000361: # (REMINDER-THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
047772,000362:
047773,000363: # DOWNLIST W
047774,000364: # WORD TAKEN FROM CONTENTS OF EXAMPLE O COMMENTS
047775,000365: # 1 ERASID 0177X 0 DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
047776,000366: # 2 LOWIDCOD 77340 1 DOWNLINK SYNCH BITS. (SAME ONE USED IN ALL OTHER DOWNLISTS)
047777,000367: # 3 DUMPLOC 13400 1 (SEE NOTES ON DUMPLOC) 1 = 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
047778,000368: # 4 TIME1 14120 1 TIME IN CENTISECONDS
047779,000369: # 5 FIRST WORD OF EBANK X 03400 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
047780,000370: # 6 2ND WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
047781,000371: # 7 3RD WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
047782,000372: # . 1
047783,000373: # . 1
047784,000374: # . 1
047785,000375: # 260D 256TH WORD OF EBANK X 03777 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
047786,000376:
047787,000377: # NOTE- DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
047788,000378: # THE BIT STRUCTURE OF DUMPLOC IS FOLLOWS---
047789,000379: # X = NOT USED
047790,000380: # X ABC EEE RRRRRRRR ABC = ERASABLE DUMP COUNTER (I.E. ABC = 0,1,2 OR 3 WHICH MEANS THAT
047791,000381: # COMPLETE ERASABLE DUMP NUMBER 1,2,3 OR 4 RESPECTIVELY IS IN PROGRESS)
047792,000382: # EEE = EBANK BITS
047793,000383: # RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK.
047794,000384:
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047796,000386: 05,3722 35021 DNDUMPI CA ZERO # INITIALIZE DOWNLINK
047797,000387: 05,3723 54336 TS DUMPLOC # ERASABLE DUMP
047798,000388: 05,3724 03766 +2 TC SENDID # GO SEND ID AND SYNCH BITS
047799,000389: 05,3725 33734 CA LDNDUMP1 # SET DNTMGOTO
047800,000390: 05,3726 54335 TS DNTMGOTO # TO LOCATION FOR NEXT PASS
047801,000391: 05,3727 30025 CA TIME1 # PLACE TIME1
047802,000392: 05,3730 56001 XCH L # INTO L
047803,000393: 05,3731 30336 CA DUMPLOC # AND ECADR OF THIS EBANK INTO A
047804,000394: 05,3732 13714 TCF DNTMEXIT # SEND DUMPLOC AND TIME1
047805,000395:
047806,000396: 05,3733 03735 LDNDUMP ADRES DNDUMP
047807,000397: 05,3734 03750 LDNDUMP1 ADRES DNDUMP1
047808,000398:
047809,000399: 05,3735 35016 DNDUMP CA TWO # INCREMENT ECADR IN DUMPLOC
047810,000400: 05,3736 26336 ADS DUMPLOC # TO NEXT DP WORD TO BE
047811,000401: 05,3737 74373 MASK LOW8 # DUMPED AND SAVE IT.
047812,000402: 05,3740 10000 CCS A # IS THIS THE BEGINNING OF A NEW EBANK
047813,000403: 05,3741 13752 TCF DNDUMP2 # NO- THEN CONTINUE DUMPING
047814,000404: 05,3742 30336 CA DUMPLOC # YES- IS THIS THE END OF THE
047815,000405: 05,3743 70333 MASK DUMPCNT # N TH(N = 1 TO 4) COMPLETE ERASABLE
047816,000406: 05,3744 77671 MASK PRIO34 # DUMP(BIT14 FOR 4, BIT13 FOR 2 OR BIT12
047817,000407: 05,3745 10000 CCS A # FOR 1 COMPLETE ERASABLE DUMP(S)).
047818,000408: 05,3746 13530 TCF DNPHASE1 # YES- START SENDING INTERRUPTED DOWNLIST
047819,000409: # AGAIN
047820,000410: 05,3747 13724 TCF DNDUMPI +2 # NO- GO BACK AND INITIALIZE NEXT BANK
047821,000411:
047822,000412: 05,3750 33733 DNDUMP1 CA LDNDUMP # SET DNTMGOTO
047823,000413: 05,3751 54335 TS DNTMGOTO # FOR WORDS 3 TO 256D OF CURRENT EBANK
047824,000414:
047825,000415: 05,3752 30336 DNDUMP2 CA DUMPLOC
047826,000416: 05,3753 54003 TS EBANK # SET EBANK
047827,000417: 05,3754 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS.
047828,000418: 05,3755 54002 TS Q # (NOTE: MASK INSTRUCTION IS USED TO PICK
047829,000419: 05,3756 35020 CA NEG0 # UP ERASABLE REGISTERS SO THAT EDITING
047830,000420: 05,3757 54001 TS L # REGISTERS 20-23 WILL NOT BE ALTERED.)
047831,000421: 05,3760 50002 INDEX Q
047832,000422: 05,3761 E3,1400 EBANK= 1400 # PICK UP LOW ORDER REGISTER OF PAIR
047833,000423: 05,3761 71401 MASK 1401 # OF ERASABLE REGISTERS.
047834,000424: 05,3762 56001 XCH L
047835,000425: 05,3763 50002 INDEX Q # PICK UP HIGH ORDER REGISTER OF PAIR
047836,000426: 05,3764 71400 MASK 1400 # OF ERASABLE REGISTERS.
047837,000427: 05,3765 0340 EBANK= DNTMBUFF
047838,000428: 05,3765 13714 TCF DNTMEXIT # GO SEND THEM
047839,000429:
047840,000430: 05,3766 00006 SENDID EXTEND # ** ENTRANCE USED BY ERASABLE DUMP PROG. **
047841,000431: 05,3767 22335 QXCH DNTMGOTO # SET DNTMGOTO SO NEXT TIME PROG WILL GO
047842,000432: 05,3770 35054 CAF ERASID # TO LOCATION FOLLOWING :TC SENDID:
047843,000433:
047844,000434: 05,3771 54001 TS L # ** ENTRANCE USED BY REGULAR DOWNLINK PG **
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047846,000436: 05,3772 03620 TC WOZERO # GO SET WORD ORDER CODE TO ZERO
047847,000437: 05,3773 32000 CAF LOWIDCOD # PLACE SPECIAL ID CODE INTO L
047848,000438: 05,3774 56001 XCH L # AND ID BACK INTO A
047849,000439: 05,3775 13714 TCF DNTMEXIT # SEND DOWNLIST ID CODE(S).
End of include-file DOWN-TELEMETRY_PROGRAM.agc. Parent file is MAIN.agc