Source Code
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These source-code files are part of a reconstructed copy of Comanche 45, the
second release, though not the final mission release, of the Apollo 10
Command Module (CM) Apollo Guidance Computer (AGC) software. Comanche 45 was
preceded by Comanche 44 and followed by Comanche 45/2 (the flown release). The reconstruction
is believed to be exactly accurate, but in the absence of an actual Apollo-era
listing of Comanche 45, some explanation of the reconstruction process is needed
to insure confidence in that accuracy.
The starting point was the source code of Comanche 44 (itself previously accurately
reconstructed). Comanche 44 source code was then modified
by incorporating changes known from contemporary documentation to have been
made between revisions 44 and 45. The now-reconstructed Comanche 45 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 tend to match those in the Comanche 55, the
most-similar revision of Comanche for which we have access to an actual non-reconstructed hardcopy;
the source code would likely have different page numbers in a contemporary
Comanche 45 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 44. Here's a guide to the Apollo documentation referenced
in those annotations:
There is also
a detailed commentary about the reconstruction process.
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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047445,000002: ## Copyright: Public domain.
047446,000003: ## Filename: DOWN-TELEMETRY_PROGRAM.agc
047447,000004: ## Purpose: A section of Comanche revision 045.
047448,000005: ## It is part of the reconstructed source code for the
047449,000006: ## second release of the flight software for the Command
047450,000007: ## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
047451,000008: ## The code has been recreated from a copy of Comanche 055. It
047452,000009: ## has been adapted such that the resulting bugger words
047453,000010: ## exactly match those specified for Comanche 45 in NASA drawing
047454,000011: ## 2021153D, which gives relatively high confidence that the
047455,000012: ## reconstruction is correct.
047456,000013: ## Assembler: yaYUL
047457,000014: ## Contact: Ron Burkey <info@sandroid.org>.
047458,000015: ## Website: www.ibiblio.org/apollo/index.html
047459,000016: ## Mod history: 2020-12-06 MAS Created from Comanche 44.
047460,000017:
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Page 1093
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047462,000019: # PROGRAM NAME - DOWN TELEMETRY PROGRAM
047463,000020: # MOD NO. - 0 TO COMPLETELY REWRITE THE DOWN TELEMETRY PROGRAM AND DOWNLINK ERASABLE DUMP PROGRAM FOR THE
047464,000021: # PURPOSE OF SAVING APPROXIMATELY 150 WORDS OF CORE STORAGE.
047465,000022: # THIS CHANGE REQUIRES AN ENTIRELY NEW METHOD OF SPECIFYING DOWNLINK LISTS. REFER TO DOWNLINK
047466,000023: # LISTS LOG SECTION FOR MORE DETAILS. HOWEVER THIS CHANGE WILL NOT AFFECT THE GROUND PROCESSING
047467,000024: # OF DOWN TELEMETRY DATA.
047468,000025: # MOD BY - KILROY, SMITH, DEWITT
047469,000026: # DATE - 02 OCT 67
047470,000027: # AUTHORS - KILROY, SMITH, DEWITT, DEWOLF, FAGIN
047471,000028: # LOG SECTION - DOWN-TELEMETRY PROGRAM
047472,000029:
047473,000030: # FUNCTIONAL DESCRIPTION - THIS ROUTINE IS INITIATED BY TELEMETRY END
047474,000031: # PULSE FROM THE DOWNLINK TELEMETRY CONVERTER. THIS PULSE OCCURS
047475,000032: # AT 50 TIMES PER SEC (EVERY 20 MS) THEREFORE DODOWNTM IS
047476,000033: # EXECUTED AT THESE RATES. THIS ROUTINE SELECTS THE APPROPRIATE
047477,000034: # AGC DATA TO BE TRANSMITTED DOWNLINK AND LOADS IT INTO OUTPUT
047478,000035: # CHANNELS 34 AND 35. THE INFORMATION IS THEN GATED OUT FROM THE
047479,000036: # LGC IN SERIAL FASHION.
047480,000037:
047481,000038: # THIS PROGRAM IS CODED FOR A 2 SECOND DOWNLIST. SINCE DOWNRUPTS
047482,000039: # OCCUR EVERY 20 MS AND 2 AGC COMPUTER WORDS CAN BE PLACED IN
047483,000040: # CHANNELS 34 AND 35 DURING EACH DOWNRUPT THE PROGRAM IS CAPABLE
047484,000041: # OF SENDING 200 AGC WORDS EVERY 2 SECONDS.
047485,000042:
047486,000043: # CALLING SEQUENCE - NONE
047487,000044: # PROGRAM IS ENTERED VIA TCF DODOWNTM WHICH IS EXECUTED AS A
047488,000045: # RESULT OF A DOWNRUPT. CONTROL IS RETURNED VIA TCF RESUME WHICH
047489,000046: # IN EFFECT IS A RESUME.
047490,000047:
047491,000048: # SUBROUTINES CALLED - NONE
047492,000049:
047493,000050: # NORMAL EXIT MODE - TCF RESUME
047494,000051:
047495,000052: # ALARM OR ABORT EXIT MODE - NONE
047496,000053:
047497,000054: # RESTART PROTECTION:
047498,000055: # ON A FRESH START AND RESTART THE 'STARTSUB' SUBROUTINE WILL INITIALIZE THE DOWNLIST POINTER (ACTUALLY
047499,000056: # DNTMGOTO) TO THE BEGINNING OF THE CURRENT DOWNLIST (I.E. CURRENT CONTENTS OF DNLSTADR). THIS HAS THE
047500,000057: # EFFECT OF IGNORING THE REMAINDER OF THE DOWNLIST WHICH THE DOWN-TELEMETRY PROGRAM WAS WORKING ON WHEN
047501,000058: # THE RESTART (OR FRESH START) OCCURRED AND RESUME DOWN TELEMETRY FROM THE BEGINNING OF THE CURRENT
047502,000059: # DOWNLIST.
047503,000060:
047504,000061: # ALSO OF INTEREST IS THE FACT THAT ON A RESTART THE AGC WILL ZERO DOWNLINK CHANNELS 13, 34 AND 35.
047505,000062:
047506,000063: # DOWNLINK LIST SELECTION:
047507,000064: # THE APPROPRIATE DOWNLINK LISTS ARE SELECTED BY THE FOLLOWING:
047508,000065: # 1. FRESH START
047509,000066: # 2. V37EXXE WHERE XX = THE MAJOR MODE BEING SELECTED.
047510,000067: # 3. UPDATE PROGRAM (P27)
047511,000068: # 4. NON-V37 SELECTABLE TYPE PROGRAMS (E.G. AGS INITIALIZATION (SUNDANCE, LUMINARY) AND P61-P62
047512,000069: # TRANSITION (COLOSSUS) ETC.).
047513,000070:
047514,000071: # DOWNLINK LIST RULES AND LIMITATIONS:
047515,000072: # READ SECTION(S) WHICH FOLLOW 'DEBRIS' WRITEUP.
047516,000073:
047517,000074: # OUTPUT - EVERY 2 SECONDS 100 DOUBLE PRECISION WORDS (I.E. 200 LGC
047518,000075: # COMPUTER WORDS) ARE TRANSMITTED VIA DOWNLINK.
047519,000076:
047520,000077: # ERASABLE INITIALIZATION REQUIRED - NONE
047521,000078: # 'DNTMGOTO' AND 'DNLSTADR' ARE INITIALIZED BY THE FRESH START PROGRAM.
047522,000079:
047523,000080: # DEBRIS (ERASABLE LOCATIONS DESTROYED BY THIS PROGRAM) -
047524,000081: # 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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047527,000084:
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Page 1095
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047529,000086: # DODOWNTM IS ENTERED EVERY 20 MS BY AN INTERRUPT TRIGGERED BY THE
047530,000087: # RECEIPT OF AN ENDPULSE FROM THE SPACECRAFT TELEMETRY PROGRAMMER.
047531,000088:
047532,000089: # NOTES REGARDING DOWNLINK LISTS ASSOCIATED WITH THIS PROGRAM:
047533,000090: # 1. DOWNLISTS. - DOWNLISTS MUST BE COMPILED IN THE SAME BANK AS THE
047534,000091: # DOWN-TELEMETRY PROGRAM. THIS IS DONE FOR EASE OF CODING, FASTER
047535,000092: # EXECUTION.
047536,000093: # 2. EACH DOWNLINK LIST CONSISTS OF A CONTROL LIST AND A NUMBER OF
047537,000094: # SUBLISTS.
047538,000095: # 3. A SUBLIST REFERS TO A SNAPSHOT OR DATA COMMON TO THE SAME OR OTHER
047539,000096: # DOWNLINK LISTS. ANY SUBLIST CONTAINING COMMON DATA NEEDS TO BE
047540,000097: # CODED ONLY ONCE FOR THE APPLICABLE DOWNLINK LISTS.
047541,000098: # 4. SNAPSHOT SUBLISTS REFER SPECIFICALLY TO HOMOGENOUS DATA WHICH MUST BE
047542,000099: # SAVED IN A BUFFER DURING ONE DOWNRUPT.
047543,000100: # 5. THE 1DNADR FOR THE 1ST WORD OF SNAPSHOT DATA IS FOUND AT THE END
047544,000101: # OF EACH SNAPSHOT SUBLIST, SINCE THE PROGRAM CODING SENDS THIS DP WORD
047545,000102: # IMMEDIATELY AFTER STORING THE OTHERS IN THE SNAPSHOT BUFFER.
047546,000103: # 6. ALL LISTS ARE COMBINATIONS OF CODED ERASABLE ADDRESS CONSTANTS
047547,000104: # CREATED FOR THE DOWNLIST PROGRAM.
047548,000105: # A. 1DNADR 1-WORD DOWNLIST ADDRESS.
047549,000106: # SAME AS ECADR, BUT USED WHEN THE WORD ADDRESSED IS THE LEFT
047550,000107: # HALF OF A DOUBLE-PRECISION WORD FOR DOWN TELEMETRY.
047551,000108: # B. 2DNADR - 6DNADR N-WORD DOWNLIST ADDRESS, N = 2 - 6.
047552,000109: # SAME AS 1DNADR, BUT WITH THE 4 UNUSED BITS OF THE ECADR FORMAT
047553,000110: # FILLED IN WITH 0001-0101. USED TO POINT TO A LIST OF N DOUBLE-
047554,000111: # PRECISION WORDS, STORED CONSECUTIVELY, FOR DOWN TELEMETRY.
047555,000112: # C. DNCHAN DOWNLIST CHANNEL ADDRESS.
047556,000113: # SAME AS 1DNADR, BUT WITH PREFIX BITS 0111. USED TO POINT TO
047557,000114: # A PAIR OF CHANNELS FOR DOWN TELEMETRY.
047558,000115: # D. DNPTR DOWN TELEMETRY SUBLIST POINTER.
047559,000116: # SAME AS CAF BUT TAGGED AS A CONSTANT. USED IN CONTROL LIST TO POINT TO A SUBLIST.
047560,000117: # CAUTION --- A DNPTR CANNOT BE USED IN A SUBLIST.
047561,000118: # 7. THE WORD ORDER CODE IS SET TO ZERO AT THE BEGINNING OF EACH DOWNLIST (I.E. CONTROL LIST) AND WHEN
047562,000119: # A '1DNADR TIME2' IS DETECTED IN THE CONTROL LIST (ONLY).
047563,000120: # 8. IN THE SNAPSHOT SUBLIST ONLY, THE DNADR'S CANNOT POINT TO THE FIRST WORD OF ANY EBANK.
047564,000121:
047565,000122: # DOWNLINK LIST RESTRICTIONS:
047566,000123: # (THE FOLLOWING POINTS MAY BE LISTED ELSEWHERE BUT ARE LISTED HERE SO IT IS CLEAR THAT THESE THINGS CANNOT BE
047567,000124: # DONE)
047568,000125: # 1. SNAPSHOT DOWNLIST:
047569,000126: # (A) CANNOT CONTAIN THE FOLLOWING ECADRS (I.E. 1DNADR'S): 0, 400, 1000, 1400, 2000, 2400, 3000, 3400.
047570,000127: # (B) CAN CONTAIN ONLY 1DNADR'S
047571,000128: # 2. ALL DOWNLINKED DATA (EXCEPT CHANNELS) IS PICKED UP BY A <DCA<SO DOWNLINK LISTS CANNOT CONTAIN THE
047572,000129: # EQUIVALENT OF THE FOLLOWING ECADRS (I.E. IDNADRS): 377, 777, 1377, 1777, 2377, 27777, 3377, 3777.
047573,000130: # (NOTE: THE TERM EQUIVALENT ' MEANT THAT THE IDNADR TO 6DNADR WILL BE PROCESSED LIKE 1 TO 6 ECADRS)
047574,000131: # 3. CONTROL LISTS AND SUBLISTS CANNOT HAVE ENTRIES = OCTAL 00000 OR OCTAL 77777
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Page 1096
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047576,000133: # 4. THE '1DNADR TIME2' WHICH WILL CAUSE THE DOWNLINK PROGRAM TO SET THE WORDER CODE TO 3 MUST APPEAR IN THE
047577,000134: # CONTROL SECTION OF THE DOWNLIST.
047578,000135: # 5. 'DNCHAN 0' CANNOT BE USED.
047579,000136: # 6. 'DNPTR 0' CANNOT BE USED.
047580,000137: # 7. DNPTR CANNOT APPEAR IN A SUBLIST.
047581,000138:
047582,000139: # EBANK SETTINGS
047583,000140: # IN THE PROCESS OF SETTING THE EBANK (WHEN PICKING UP DOWNLINK DATA) THE DOWN TELEMETRY PROGRAM PUTS
047584,000141: # 'GARBAGE' INTO BITS15-12 OF EBANK. HUGH BLAIR-SMITH WARNS US THAT BITS15-12 OF EBANK MAY BECOME
047585,000142: # SIGNIFICANT SOMEDAY IN THE FUTURE. IF/WHEN THAT HAPPENS, THE PROGRAM SHOULD INSURE (BY MASKING ETC.)
047586,000143: # THAT BITS 15-12 OF EBANK ARE ZERO.
047587,000144:
047588,000145: # INITIALIZATION REQUIRED - TO INTERRUPT CURRENT LIST AND START A NEW ONE..
047589,000146: # 1. ADRES OF DOWNLINK LIST INTO DNLSTADR
047590,000147: # 2. NEGONE INTO SUBLIST
047591,000148: # 3. NEGONE INTO DNECADR
047592,000149:
047593,000150: 22,3510 BANK 22
047594,000151: 05,2000 SETLOC DOWNTELM
047595,000152: 05,2000 BANK
047596,000153:
047597,000154: 05,3521 0340 EBANK= DNTMBUFF
047598,000155:
047599,000156: 05,3521 COUNT 05/DPROG
047600,000157:
047601,000158: 05,3521 54016 DODOWNTM TS BANKRUPT
047602,000159: 05,3522 00006 EXTEND
047603,000160: 05,3523 22012 QXCH QRUPT # SAVE Q
047604,000161: 05,3524 35011 CA BIT7 # SET WORD ORDER CODE TO 1. EXCEPTION- AT
047605,000162: 05,3525 00006 EXTEND # THE BEGINNING OF EACH LIST THE WORD
047606,000163: 05,3526 05013 WOR CHAN13 # CODE WILL BE SET BACK TO 0.
047607,000164: 05,3527 00335 TC DNTMGOTO # GOTO APPROPRIATE PHASE OF PROGRAM
047608,000165:
047609,000166: 05,3530 37716 DNPHASE1 CA NEGONE # INITIALIZE ALL CONTROL WORDS
047610,000167: 05,3531 54337 TS SUBLIST # WORDS TO MINUS ONE
047611,000168: 05,3532 54336 TS DNECADR
047612,000169: 05,3533 33653 CA LDNPHAS2 # SET DNTMGOTO =O ALL SUBSEQUENT DOWNRUPTS
047613,000170: 05,3534 54335 TS DNTMGOTO # GO TO DNPHASE2
047614,000171: 05,3535 13551 TCF NEWLIST
047615,000172: 05,3536 10336 DNPHASE2 CCS DNECADR # SENDING OF DATA IN PROGRESS
047616,000173: 05,3537 03666 DODNADR TC FETCH2WD # YES - THEN FETCH THE NEXT 2 SP WORDS
047617,000174: 05,3540 77753 MINTIME2 -1DNADR TIME2 # NEGATIVE OF TIME2 1DNADR
047618,000175: 05,3541 13542 TCF +1 # (ECADR OF 3776 + 74001 = 77777)
047619,000176:
047620,000177: 05,3542 10337 CCS SUBLIST # IS THE SUBLIST IN CONTROL
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Page 1097
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047622,000179: 05,3543 13701 TCF NEXTINSL # YES
047623,000180: 05,3544 74001 DNADRDCR OCT 74001 # DNADR COUNT AND ECADR DECREMENTER
047624,000181:
047625,000182: 05,3545 30334 CHKLIST CA CTLIST
047626,000183: 05,3546 00006 EXTEND
047627,000184: 05,3547 63551 BZMF NEWLIST # IT WILL BE NEGATIVE AT END OF LIST
047628,000185: 05,3550 13556 TCF NEXTINCL
047629,000186: 05,3551 50332 NEWLIST INDEX DNLSTCOD
047630,000187: 05,3552 32335 CA DNTABLE # INITIALIZE CTLIST WITH
047631,000188: 05,3553 54334 TS CTLIST # STARTING ADDRESS OF NEW LIST
047632,000189: 05,3554 40332 CS DNLSTCOD
047633,000190: 05,3555 13771 TCF SENDID +3
047634,000191: 05,3556 50334 NEXTINCL INDEX CTLIST
047635,000192: 05,3557 30000 CA 0
047636,000193: 05,3560 10000 CCS A
047637,000194: 05,3561 24334 INCR CTLIST # SET POINTER TO PICK UP NEXT CTLIST WORD
047638,000195: 05,3562 13566 TCF +4 # ON NEXT ENTRY TO PROG. (A SHOULD NOT =0)
047639,000196: 05,3563 56334 XCH CTLIST # SET CTLIST TO NEGATIVE AND PLACE(CODING)
047640,000197: 05,3564 40000 COM # UNCOMPLEMENTED DNADR INTO A. (FOR LA)
047641,000198: 05,3565 56334 XCH CTLIST # (ST IN )
047642,000199: 05,3566 24000 +4 INCR A # (CTLIST)
047643,000200: 05,3567 54336 TS DNECADR # SAVE DNADR
047644,000201: 05,3570 63540 AD MINTIME2 # TEST FOR TIME2 (NEG. OF ECADR)
047645,000202: 05,3571 10000 CCS A
047646,000203: 05,3572 13576 TCF SETWO +1 # DON'T SET WORD ORDER CODE
047647,000204: 05,3573 47777 MINB1314 OCT 47777 # MINUS BIT 13 AND 14 (CAN'T GET HERE)
047648,000205: 05,3574 13576 TCF SETWO +1 # DON'T SET WORD ORDER CODE
047649,000206: 05,3575 03620 SETWO TC WOZERO # GO SET WORD ORDER CODE TO ZERO.
047650,000207: 05,3576 30336 +1 CA DNECADR # RELOAD A WITH THE DNADR.
047651,000208: 05,3577 63573 +2 AD MINB1314 # IS THIS A REGULAR DNADR?
047652,000209: 05,3600 00006 EXTEND
047653,000210: 05,3601 63666 BZMF FETCH2WD # YES. (A MUST NEVER BE ZERO)
047654,000211: 05,3602 67710 AD MINB12 # NO- IS IT A POINTER (DNPTR) OR A
047655,000212: 05,3603 00006 EXTEND # CHANNEL(DNCHAN)
047656,000213: 05,3604 63624 BZMF DODNPTR # IT'S A POINTER. (A MUST NEVER BE ZERO)
047657,000214:
047658,000215: 05,3605 00006 DODNCHAN TC 6 # (EXECUTED AS EXTEND) IT S A CHANNEL
047659,000216: 05,3606 50336 INDEX DNECADR
047660,000217: 05,3607 44000 INDEX 0 -4000 # (EXECUTED AS READ)
047661,000218: 05,3610 54001 TS L
047662,000219: 05,3611 00006 TC 6 # (EXECUTED AS EXTEND)
047663,000220: 05,3612 50336 INDEX DNECADR
047664,000221: 05,3613 43777 INDEX 0 -4001 # (EXECUTED AS READ)
047665,000222: 05,3614 54336 TS DNECADR # SET DNECADR
047666,000223: 05,3615 37716 CA NEGONE # TO MINUS
047667,000224: 05,3616 56336 XCH DNECADR # WHILE PRESERVING A.
047668,000225: 05,3617 13714 TCF DNTMEXIT # GO SEND CHANNELS
047669,000226:
047670,000227: 05,3620 45011 WOZERO CS BIT7
047671,000228: 05,3621 00006 EXTEND
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Page 1098
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047673,000230: 05,3622 03013 WAND CHAN13 # SET WORD ORDER CODE TO ZERO
047674,000231: 05,3623 00002 TC Q # RETURN TO CALLER
047675,000232:
047676,000233: 05,3624 50336 DODNPTR INDEX DNECADR # DNECADR CONTAINS ADRES OF SUBLIST
047677,000234: 05,3625 00000 0 0 # CLEAR AND ADD LIST ENTRY INTO A.
047678,000235: 05,3626 10000 CCS A # IS THIS A SNAPSHOT SUBLIST
047679,000236: 05,3627 30336 CA DNECADR # NO, IT IS A REGULAR SUBLIST.
047680,000237: 05,3630 13700 TCF DOSUBLST # A MUST NOT BE ZERO.
047681,000238:
047682,000239: 05,3631 56336 XCH DNECADR # YES, IT IS A SNAPSHOT SUBLIST.
047683,000240: 05,3632 54337 TS SUBLIST # C(DNECADR) INTO SUBLIST
047684,000241: 05,3633 35021 CAF ZERO # A INTO A
047685,000242: 05,3634 56336 XCH TMINDEX # (NOTE.. TMINDEX = DNECADR)
047686,000243:
047687,000244: # THE FOLLOWING CODING (FROM SNAPLOOP TO SNAPEND) IS FOR THE PURPOSE OF TAKING A SNAPSHOT OF 12 DP REGISTERS.
047688,000245: # THIS IS DONE BY SAVING 11 DP REGISTERS IN DNTMBUFF AND SENDING THE FIRST DP WORD IMMEDIATELY.
047689,000246: # THE SNAPSHOT PROCESSING IS THE MOST TIME CONSUMING AND THEREFORE THE CODING AND LIST STRUCTURE WERE DESIGNED
047690,000247: # TO MINIMIZE TIME. THE TIME OPTIMIZATION RESULTS IN RULES UNIQUE TO THE SNAPSHOT PORTION OF THE DOWNLIST.
047691,000248: # THESE RULES ARE ......
047692,000249: # 1. ONLY 1DNADR'S CAN APPEAR IN THE SNAPSHOT SUBLIST
047693,000250: # 2. THE 1DNADR'S CANNOT REFER TO THE FIRST LOCATION IN ANY BANK.
047694,000251:
047695,000252: 05,3635 54003 SNAPLOOP TS EBANK # SET EBANK
047696,000253: 05,3636 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS
047697,000254: 05,3637 00006 EXTEND
047698,000255: 05,3640 50000 INDEX A
047699,000256: 05,3641 E3,1401 EBANK= 1401
047700,000257: 05,3641 31402 DCA 1401 # PICK UP 2 SNAPSHOT WORDS.
047701,000258: 05,3642 0340 EBANK= DNTMBUFF
047702,000259: 05,3642 50336 INDEX TMINDEX
047703,000260: 05,3643 52341 DXCH DNTMBUFF # STORE 2 SNAPSHOT WORDS IN BUFFER
047704,000261: 05,3644 24336 INCR TMINDEX # SET BUFFER INDEX FOR NEXT 2 WORDS.
047705,000262: 05,3645 24336 INCR TMINDEX
047706,000263: 05,3646 24337 SNAPAGN INCR SUBLIST # SET POINTER TO NEXT 2 WORDS OF SNAPSHOT
047707,000264: 05,3647 50337 INDEX SUBLIST
047708,000265: 05,3650 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
047709,000266: 05,3651 10000 CCS A # TEST FOR LAST TWO WORDS OF SNAPSHOT.
047710,000267: 05,3652 13635 TCF SNAPLOOP # NOT LAST TWO.
047711,000268: 05,3653 03536 LDNPHAS2 GENADR DNPHASE2
047712,000269: 05,3654 54337 TS SUBLIST # YES, LAST. SAVE A.
047713,000270: 05,3655 37716 CA NEGONE # SET DNECADR AND
047714,000271: 05,3656 54336 TS DNECADR # SUBLIST POINTERS
047715,000272: 05,3657 56337 XCH SUBLIST # TO NEGATIVE VALUES.
047716,000273: 05,3660 54003 TS EBANK
047717,000274: 05,3661 74373 MASK LOW8
047718,000275: 05,3662 00006 EXTEND
047719,000276: 05,3663 50000 INDEX A
047720,000277: 05,3664 E3,1401 EBANK= 1401
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Page 1099
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047722,000279: 05,3664 31402 DCA 1401 # PICK UP FIRST 2 WORDS OF SNAPSHOT.
047723,000280: 05,3665 0340 EBANK= DNTMBUFF
047724,000281: 05,3665 13714 SNAPEND TCF DNTMEXIT # NOW GO SEND THEM.
047725,000282:
047726,000283: 05,3666 30336 FETCH2WD CA DNECADR
047727,000284: 05,3667 54003 TS EBANK # SET EBANK
047728,000285: 05,3670 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS
047729,000286: 05,3671 54001 TS L
047730,000287: 05,3672 33544 CA DNADRDCR # DECREMENT COUNT AND ECADR
047731,000288: 05,3673 26336 ADS DNECADR
047732,000289: 05,3674 00006 EXTEND
047733,000290: 05,3675 50001 INDEX L
047734,000291: 05,3676 E3,1400 EBANK= 1400
047735,000292: 05,3676 31401 DCA 1400 # PICK UP 2 DATA WORDS
047736,000293: 05,3677 0340 EBANK= DNTMBUFF
047737,000294: 05,3677 13714 TCF DNTMEXIT # NOW GO SEND THEM.
047738,000295:
047739,000296: 05,3700 54337 DOSUBLST TS SUBLIST # SET SUBLIST POINTER
047740,000297: 05,3701 50337 NEXTINSL INDEX SUBLIST
047741,000298: 05,3702 00000 0 0 # = CA SSSS (SSSS = NEXT ENTRY IN SUBLIST)
047742,000299: 05,3703 10000 CCS A # IS IT THE END OF THE SUBLIST
047743,000300: 05,3704 24337 INCR SUBLIST # NO-
047744,000301: 05,3705 13711 TCF +4
047745,000302: 05,3706 54337 TS SUBLIST # SAVE A.
047746,000303: 05,3707 37716 CA NEGONE # SET SUBLIST TO MINUS
047747,000304: 05,3710 56337 XCH SUBLIST # RETRIEVE A.
047748,000305: 05,3711 24000 +4 INCR A
047749,000306: 05,3712 54336 TS DNECADR # SAVE DNADR
047750,000307: 05,3713 13577 TCF SETWO +2 # GO USE COMMON CODING (PROBLEMS WOULD
047751,000308: # OCCUR IF THE PROGRAM ENCOUNTERED A
047752,000309: # DNPTR NOW)
047753,000310:
047754,000311: 05,3714 00006 DNTMEXIT EXTEND # DOWN-TELEMETRY EXIT
047755,000312: 05,3715 01034 WRITE DNTM1 # TO SEND A + L TO CHANNELS 34 + 35
047756,000313: 05,3716 30001 CA L # RESPECTIVELY
047757,000314: 05,3717 00006 TMEXITL EXTEND
047758,000315: 05,3720 01035 WRITE DNTM2
047759,000316: 05,3721 15333 TMRESUME TCF RESUME # EXIT TELEMETRY PROGRAM VIA RESUME.
047760,000317:
047761,000318: 05,3722 7710 MINB12 EQUALS -1/8
047762,000319: 05,3722 0336 DNECADR EQUALS TMINDEX
047763,000320: 05,3722 0334 CTLIST EQUALS LDATALST
047764,000321: 05,3722 0337 SUBLIST EQUALS DNQ
047765,000322:
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Page 1100
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047767,000324: # SUBROUTINE NAME - DNDUMP
047768,000325:
047769,000326: # FUNCTIONAL DESCRIPTION - TO SEND (DUMP) ALL ERASABLE STORAGE 'N' TIMES.(N = 1 TO 4). BANKS ARE SENT ONE AT A TIME
047770,000327: # EACH BANK IS PRECEEDED BY AN ID WORD, SYNCH BITS, ECADR AND TIME1 FOLLOWED BY THE 256D WORDS OF EACH
047771,000328: # EBANK. EBANKS ARE DUMPED IN ORDER (I.E. EBANK 0 FIRST, THEN EBANK1 ETC.)
047772,000329:
047773,000330: # CALLING SEQUENCE- THE GROUND OR ASTRONAUT BY KEYING V74E CAN INITIALIZE THE DUMP.
047774,000331: # AFTER KEYING IN V74E THE CURRENT DOWNLIST WILL BE IMMEDIATELY TERMINATED AND THE DOWNLINK ERASABLE DUMP
047775,000332: # WILL BEGIN.
047776,000333:
047777,000334: # ONCE INITIATED THE DOWNLINK ERASABLE DUMP CAN BE TERMINATED (AND INTERRUPTED DOWNLIST REINSTATED) ONLY
047778,000335: # BY THE FOLLOWING:
047779,000336:
047780,000337: # 1. A FRESH START
047781,000338: # 2. COMPLETION OF ALL DOWNLINK DUMPS REQUESTED (ACCORDING TO BITS SET IN DUMPCNT). NOTE THAT DUMPCNT
047782,000339: # CAN BE ALTERED BY A V21N01.
047783,000340: # 3. AND INVOLUNTARILY BY A RESTART.
047784,000341:
047785,000342: # NORMAL EXIT MODE- TCF DNPHASE1
047786,000343:
047787,000344: # ALARM OR ABORT MODE- NONE
047788,000345:
047789,000346: # *SUBROUTINES CALLED- NONE.
047790,000347:
047791,000348: # ERASABLE INITIALIZATION REQUIRED-
047792,000349: # DUMPCNT OCT 20000 IF 4 COMPLETE ERASABLE DUMPS ARE DESIRED
047793,000350: # DUMPCNT OCT 10000 IF 2 COMPLETE ERASABLE DUMPS ARE DESIRED
047794,000351: # DUMPCNT OCT 04000 IF 1 COMPLETE ERASABLE DUMP IS DESIRED
047795,000352:
047796,000353: # DEBRIS- DUMPLOC, DUMPSW, DNTMGOTO, EBANK AND CENTRAL REGISTERS
047797,000354:
047798,000355: # TIMING- TIME (IN SECS) = ((NO.DUMPS)*(NO.EBANKS)*(WDSPEREBANK + NO.IDWDS)) / NO.WDSPERSEC
047799,000356: # TIME (IN SECS) = ( 4 )*( 8 )*( 256 + 4 ) / 100
047800,000357: # THUS TIME (IN SECS TO SEND DUMP OF ERASABLE 4 TIMES VIA DOWNLINK) = 83.2 SECONDS
047801,000358:
047802,000359: # STRUCTURE OF ONE EBANK AS IT IS SENT BY DOWNLINK PROGRAM-
047803,000360: # (REMINDER-THIS ONLY DESCRIBES ONE OF THE 8 EBANKS X 4 (DUMPS) = 32 EBANKS WHICH WILL BE SENT BY DNDUMP)
047804,000361:
047805,000362: # DOWNLIST W
047806,000363: # WORD TAKEN FROM CONTENTS OF EXAMPLE O COMMENTS
047807,000364: # 1 ERASID 0177X 0 DOWNLIST I.D. FOR DOWNLINK ERASABLE DUMP (X=7 CSM, 6 LM)
047808,000365: # 2 LOWIDCOD 77340 1 DOWNLINK SYNCH BITS. (SAME ONE USED IN ALL OTHER DOWNLISTS)
047809,000366: # 3 DUMPLOC 13400 1 (SEE NOTES ON DUMPLOC) 1 = 3RD ERAS DUMP, 3400=ECADR OF 5TH WD
047810,000367: # 4 TIME1 14120 1 TIME IN CENTISECONDS
047811,000368: # 5 FIRST WORD OF EBANK X 03400 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1400 (ECADR 3400)
047812,000369: # 6 2ND WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1401 (ECADR 3401)
047813,000370: # 7 3RD WORD OF EBANK X 00142 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1402 (ECADR 3402)
047814,000371: # . 1
047815,000372: # . 1
047816,000373: # . 1
047817,000374: # 260D 256TH WORD OF EBANK X 03777 1 IN THIS EXAMPLE THIS WORD = CONTENTS OF E7,1777 (ECADR 3777)
047818,000375:
047819,000376: # NOTE- DUMPLOC CONTAINS THE COUNTER AND ECADR FOR EACH WORD BEING SENT.
047820,000377: # THE BIT STRUCTURE OF DUMPLOC IS FOLLOWS---
047821,000378: # X = NOT USED
047822,000379: # X ABC EEE RRRRRRRR ABC = ERASABLE DUMP COUNTER (I.E. ABC = 0,1,2 OR 3 WHICH MEANS THAT
047823,000380: # COMPLETE ERASABLE DUMP NUMBER 1,2,3 OR 4 RESPECTIVELY IS IN PROGRESS)
047824,000381: # EEE = EBANK BITS
047825,000382: # RRRRRRRR = RELATIVE ADDRESS WITHIN AN EBANK.
047826,000383:
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047828,000385: 05,3722 35021 DNDUMPI CA ZERO # INITIALIZE DOWNLINK
047829,000386: 05,3723 54336 TS DUMPLOC # ERASABLE DUMP
047830,000387: 05,3724 03766 +2 TC SENDID # GO SEND ID AND SYNCH BITS
047831,000388: 05,3725 33734 CA LDNDUMP1 # SET DNTMGOTO
047832,000389: 05,3726 54335 TS DNTMGOTO # TO LOCATION FOR NEXT PASS
047833,000390: 05,3727 30025 CA TIME1 # PLACE TIME1
047834,000391: 05,3730 56001 XCH L # INTO L
047835,000392: 05,3731 30336 CA DUMPLOC # AND ECADR OF THIS EBANK INTO A
047836,000393: 05,3732 13714 TCF DNTMEXIT # SEND DUMPLOC AND TIME1
047837,000394:
047838,000395: 05,3733 03735 LDNDUMP ADRES DNDUMP
047839,000396: 05,3734 03750 LDNDUMP1 ADRES DNDUMP1
047840,000397:
047841,000398: 05,3735 35016 DNDUMP CA TWO # INCREMENT ECADR IN DUMPLOC
047842,000399: 05,3736 26336 ADS DUMPLOC # TO NEXT DP WORD TO BE
047843,000400: 05,3737 74373 MASK LOW8 # DUMPED AND SAVE IT.
047844,000401: 05,3740 10000 CCS A # IS THIS THE BEGINNING OF A NEW EBANK
047845,000402: 05,3741 13752 TCF DNDUMP2 # NO- THEN CONTINUE DUMPING
047846,000403: 05,3742 30336 CA DUMPLOC # YES- IS THIS THE END OF THE
047847,000404: 05,3743 70333 MASK DUMPCNT # N TH(N = 1 TO 4) COMPLETE ERASABLE
047848,000405: 05,3744 77671 MASK PRIO34 # DUMP(BIT14 FOR 4, BIT13 FOR 2 OR BIT12
047849,000406: 05,3745 10000 CCS A # FOR 1 COMPLETE ERASABLE DUMP(S)).
047850,000407: 05,3746 13530 TCF DNPHASE1 # YES- START SENDING INTERRUPTED DOWNLIST
047851,000408: # AGAIN
047852,000409: 05,3747 13724 TCF DNDUMPI +2 # NO- GO BACK AND INITIALIZE NEXT BANK
047853,000410:
047854,000411: 05,3750 33733 DNDUMP1 CA LDNDUMP # SET DNTMGOTO
047855,000412: 05,3751 54335 TS DNTMGOTO # FOR WORDS 3 TO 256D OF CURRENT EBANK
047856,000413:
047857,000414: 05,3752 30336 DNDUMP2 CA DUMPLOC
047858,000415: 05,3753 54003 TS EBANK # SET EBANK
047859,000416: 05,3754 74373 MASK LOW8 # ISOLATE RELATIVE ADDRESS.
047860,000417: 05,3755 54002 TS Q # (NOTE: MASK INSTRUCTION IS USED TO PICK
047861,000418: 05,3756 35020 CA NEG0 # UP ERASABLE REGISTERS SO THAT EDITING
047862,000419: 05,3757 54001 TS L # REGISTERS 20-23 WILL NOT BE ALTERED.)
047863,000420: 05,3760 50002 INDEX Q
047864,000421: 05,3761 E3,1400 EBANK= 1400 # PICK UP LOW ORDER REGISTER OF PAIR
047865,000422: 05,3761 71401 MASK 1401 # OF ERASABLE REGISTERS.
047866,000423: 05,3762 56001 XCH L
047867,000424: 05,3763 50002 INDEX Q # PICK UP HIGH ORDER REGISTER OF PAIR
047868,000425: 05,3764 71400 MASK 1400 # OF ERASABLE REGISTERS.
047869,000426: 05,3765 0340 EBANK= DNTMBUFF
047870,000427: 05,3765 13714 TCF DNTMEXIT # GO SEND THEM
047871,000428:
047872,000429: 05,3766 00006 SENDID EXTEND # ** ENTRANCE USED BY ERASABLE DUMP PROG. **
047873,000430: 05,3767 22335 QXCH DNTMGOTO # SET DNTMGOTO SO NEXT TIME PROG WILL GO
047874,000431: 05,3770 35054 CAF ERASID # TO LOCATION FOLLOWING :TC SENDID:
047875,000432:
047876,000433: 05,3771 54001 TS L # ** ENTRANCE USED BY REGULAR DOWNLINK PG **
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047878,000435: 05,3772 03620 TC WOZERO # GO SET WORD ORDER CODE TO ZERO
047879,000436: 05,3773 32000 CAF LOWIDCOD # PLACE SPECIAL ID CODE INTO L
047880,000437: 05,3774 56001 XCH L # AND ID BACK INTO A
047881,000438: 05,3775 13714 TCF DNTMEXIT # SEND DOWNLIST ID CODE(S).
End of include-file DOWN-TELEMETRY_PROGRAM.agc. Parent file is MAIN.agc