Source Code
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These source-code files are part of a reconstructed copy of Luminary 97, the
second release of the Apollo 11 Lunar Module (LM) Apollo Guidance Computer
(AGC) software. It was created to fix two incorrect ephemeris constants in
Luminary 96, as described by anomaly report LNY-59.
The reconstruction began with source code of Luminary 99 revision 1 previously
transcribed from a digitized copy of that program. The code was then updated
by undoing changes described in original Luminary memos 83 and 85, using asterisks
indicating changed lines in the listing as a guide. The reconstruction was
verified by matching memory-bank checksums to those listed in drawing 2021152D.
Note that page numbers in the reconstructed code match those on the Luminary 099
revision 001 printout, although the added code would likely have changed page
numbers for a real Luminary 97 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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042825,000002: ## Copyright: Public domain.
042826,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
042827,000004: ## Purpose: A section of Luminary revision 97.
042828,000005: ## It is part of the reconstructed source code for the
042829,000006: ## second release of the flight software for the Lunar
042830,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 11.
042831,000008: ## It was created to fix two incorrect ephemeris constants in
042832,000009: ## Luminary 96, as described by anomaly report LNY-59.
042833,000010: ## The code has been recreated from a copy of Luminary 99
042834,000011: ## revision 001, using asterisks indicating changed lines in
042835,000012: ## the listing and Luminary Memos #83 and #85, which list
042836,000013: ## changes between Luminary 97 and 98, and 98 and 99. The
042837,000014: ## code has been adapted such that the resulting bugger words
042838,000015: ## exactly match those specified for Luminary 97 in NASA drawing
042839,000016: ## 2021152D, which gives relatively high confidence that the
042840,000017: ## reconstruction is correct.
042841,000018: ## Reference: pp. 998-1001
042842,000019: ## Assembler: yaYUL
042843,000020: ## Contact: Ron Burkey <info@sandroid.org>.
042844,000021: ## Website: www.ibiblio.org/apollo/index.html
042845,000022: ## Mod history: 2019-07-28 MAS Created from Luminary 99.
042846,000023: ## 2021-05-30 ABS ISWCALLL -> ISWCALL
042847,000024:
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Page 998
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042849,000026: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
042850,000027: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
042851,000028:
042852,000029: 4616 BLOCK 02
042853,000030: 4616 COUNT* $$/BANK
042854,000031: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
042855,000032: 4617 50002 INDEX Q # PICK UP CADR.
042856,000033: 4620 30000 CA 0
042857,000034: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
042858,000035:
042859,000036: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
042860,000037:
042861,000038: 4622 54001 SWCALL TS L
042862,000039: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
042863,000040: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
042864,000041: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
042865,000042: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
042866,000043: 4627 50002 INDEX Q
042867,000044: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
042868,000045:
042869,000046: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
042870,000047: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
042871,000048: 4633 56134 XCH BUF2 +1
042872,000049: 4634 00133 TC BUF2
042873,000050:
042874,000051: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
042875,000052: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
042876,000053:
042877,000054: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
042878,000055: 4636 50000 INDEX A # GET CADR.
042879,000056: 4637 30000 CA 0
042880,000057:
042881,000058: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
042882,000059:
042883,000060: 4640 54004 BANKJUMP TS FBANK
042884,000061: 4641 75012 MASK LOW10
042885,000062: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
042886,000063: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
042887,000064: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
042888,000065:
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Page 999
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042890,000067: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
042891,000068:
042892,000069: 4645 35012 MAKECADR CAF LOW10
042893,000070: 4646 70133 MASK BUF2
042894,000071: 4647 60134 AD BUF2 +1
042895,000072: 4650 00002 TC Q
042896,000073:
042897,000074: 4651 54135 SUPDACAL TS MPTEMP
042898,000075: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
042899,000076: 4653 00006 EXTEND
042900,000077: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
042901,000078: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
042902,000079: 4656 75012 MASK LOW10
042903,000080: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
042904,000081: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
042905,000082: 4661 00006 EXTEND
042906,000083: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
042907,000084: 4663 50001 INDEX L
042908,000085: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
042909,000086: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
042910,000087: 4666 00006 EXTEND
042911,000088: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
042912,000089: 4670 00003 RELINT
042913,000090: 4671 54004 TS FBANK # RESTORE FBANK.
042914,000091: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
042915,000092: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
042916,000093:
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Page 1000
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042918,000095: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
042919,000096:
042920,000097: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
042921,000098: 4675 50002 INDEX Q
042922,000099: 4676 30000 CAF 0
042923,000100: 4677 24002 INCR Q
042924,000101:
042925,000102: 4700 54001 ISWCALL TS L
042926,000103: 4701 22004 LXCH FBANK
042927,000104: 4702 75012 MASK LOW10
042928,000105: 4703 56002 XCH Q
042929,000106: 4704 52073 DXCH RUPTREG3
042930,000107: 4705 50002 INDEX Q
042931,000108: 4706 02000 TC 10000
042932,000109:
042933,000110: 4707 56073 ISWRETRN XCH RUPTREG4
042934,000111: 4710 56004 XCH FBANK
042935,000112: 4711 56073 XCH RUPTREG4
042936,000113: 4712 00072 TC RUPTREG3
042937,000114:
042938,000115: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
042939,000116: # L TC USPRCADR
042940,000117: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
042941,000118: # RETURN IS TO L+2
042942,000119:
042943,000120: 4713 54164 USPRCADR TS LOC # SAVE A
042944,000121: 4714 34744 CA BIT8
042945,000122: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
042946,000123: 4716 30006 CA BBANK
042947,000124: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
042948,000125: 4720 50002 INDEX Q
042949,000126: 4721 30000 CA 0
042950,000127: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
042951,000128: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
042952,000129: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
042953,000130: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
042954,000131: 4726 14643 TCF Q+10000
042955,000132:
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Page 1001
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042957,000134: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
042958,000135:
042959,000136: # PSEUDO-FIXED OCTAL PSEUDO
042960,000137: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
042961,000138: # ---------- ------- ------------ ------------ ------------
042962,000139: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
042963,000140: # WILL USUALLY BE SEEN AS 11)
042964,000141: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
042965,000142: # ONLY BANKS 40-43 WILL EVER BE
042966,000143: # AND ARE PRESENTLY AVAILABLE)
042967,000144: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
042968,000145: # THE USER)
042969,000146: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
042970,000147: # THE USER)
042971,000148: # *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
042972,000149: # SUPERBANK SHOULD USE SUPERSW. ***
042973,000150:
042974,000151: # SUPERSW MAY BE CALLED IN THIS FASHION:
042975,000152: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
042976,000153: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
042977,000154: # ... ...
042978,000155: # . .
042979,000156: # . .
042980,000157: # OR IN THIS FASHION:
042981,000158: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
042982,000159: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
042983,000160: # ... ... SUPER011 OCTAL 60
042984,000161: # . . SUPER100 OCTAL 100
042985,000162: # . . SUPER101 OCTAL 120
042986,000163: # SUPER110 OCTAL 140
042987,000164:
042988,000165: 4727 00006 SUPERSW EXTEND
042989,000166: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
042990,000167: # CHANNEL 07
042991,000168: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
042992,000169: # TC SUPERSW
042993,000170:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc