Source Code
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These source-code files are part of a reconstructed copy of LUM69 Revision 2, the
flown Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.
The reconstruction began with source code of Luminary 69 revision 0 previously
transcribed from a digitized copy of that program. The code was then updated
by back-porting the R-2 lunar potential model from previously-transcribed source
code of Luminary 99. These required changes were described in the original
Luminary memos 75 and 78. The reconstructed code was verified by
matching memory-bank checksums to those listed in drawing 2021152G. Note that
page numbers in the reconstructed code match those on the Luminary 069 printout,
although the added code would likely have changed page numbers for a real LUM69
Revision 2 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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043581,000002: ## Copyright: Public domain.
043582,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
043583,000004: ## Purpose: A section of LUM69 revision 2.
043584,000005: ## It is part of the reconstructed source code for the flown
043585,000006: ## version of the flight software for the Lunar Module's (LM)
043586,000007: ## Apollo Guidance Computer (AGC) for Apollo 10. The code has
043587,000008: ## been recreated from a copy of Luminary revsion 069, using
043588,000009: ## changes present in Luminary 099 which were described in
043589,000010: ## Luminary memos 75 and 78. The code has been adapted such
043590,000011: ## that the resulting bugger words exactly match those specified
043591,000012: ## for LUM69 revision 2 in NASA drawing 2021152B, which gives
043592,000013: ## relatively high confidence that the reconstruction is correct.
043593,000014: ## Reference: pp. 993-996
043594,000015: ## Assembler: yaYUL
043595,000016: ## Contact: Ron Burkey <info@sandroid.org>.
043596,000017: ## Website: www.ibiblio.org/apollo/index.html
043597,000018: ## Mod history: 2019-07-27 MAS Created from Luminary 69.
043598,000019:
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Page 993
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043600,000021: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
043601,000022: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
043602,000023:
043603,000024: 4616 BLOCK 02
043604,000025: 4616 COUNT* $$/BANK
043605,000026: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
043606,000027: 4617 50002 INDEX Q # PICK UP CADR.
043607,000028: 4620 30000 CA 0
043608,000029: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
043609,000030:
043610,000031: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
043611,000032:
043612,000033: 4622 54001 SWCALL TS L
043613,000034: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
043614,000035: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
043615,000036: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
043616,000037: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
043617,000038: 4627 50002 INDEX Q
043618,000039: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
043619,000040:
043620,000041: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
043621,000042: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
043622,000043: 4633 56134 XCH BUF2 +1
043623,000044: 4634 00133 TC BUF2
043624,000045:
043625,000046: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
043626,000047: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
043627,000048:
043628,000049: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
043629,000050: 4636 50000 INDEX A # GET CADR.
043630,000051: 4637 30000 CA 0
043631,000052:
043632,000053: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
043633,000054:
043634,000055: 4640 54004 BANKJUMP TS FBANK
043635,000056: 4641 75012 MASK LOW10
043636,000057: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
043637,000058: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
043638,000059: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
043639,000060:
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Page 994
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043641,000062: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
043642,000063:
043643,000064: 4645 35012 MAKECADR CAF LOW10
043644,000065: 4646 70133 MASK BUF2
043645,000066: 4647 60134 AD BUF2 +1
043646,000067: 4650 00002 TC Q
043647,000068:
043648,000069: 4651 54135 SUPDACAL TS MPTEMP
043649,000070: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
043650,000071: 4653 00006 EXTEND
043651,000072: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
043652,000073: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
043653,000074: 4656 75012 MASK LOW10
043654,000075: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
043655,000076: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
043656,000077: 4661 00006 EXTEND
043657,000078: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
043658,000079: 4663 50001 INDEX L
043659,000080: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
043660,000081: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
043661,000082: 4666 00006 EXTEND
043662,000083: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
043663,000084: 4670 00003 RELINT
043664,000085: 4671 54004 TS FBANK # RESTORE FBANK.
043665,000086: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
043666,000087: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
043667,000088:
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Page 995
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043669,000090: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
043670,000091:
043671,000092: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
043672,000093: 4675 50002 INDEX Q
043673,000094: 4676 30000 CAF 0
043674,000095: 4677 24002 INCR Q
043675,000096:
043676,000097: 4700 54001 ISWCALLL TS L
043677,000098: 4701 22004 LXCH FBANK
043678,000099: 4702 75012 MASK LOW10
043679,000100: 4703 56002 XCH Q
043680,000101: 4704 52073 DXCH RUPTREG3
043681,000102: 4705 50002 INDEX Q
043682,000103: 4706 02000 TC 10000
043683,000104:
043684,000105: 4707 56073 ISWRETRN XCH RUPTREG4
043685,000106: 4710 56004 XCH FBANK
043686,000107: 4711 56073 XCH RUPTREG4
043687,000108: 4712 00072 TC RUPTREG3
043688,000109:
043689,000110: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
043690,000111: # L TC USPRCADR
043691,000112: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
043692,000113: # RETURN IS TO L+2
043693,000114:
043694,000115: 4713 54164 USPRCADR TS LOC # SAVE A
043695,000116: 4714 34744 CA BIT8
043696,000117: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
043697,000118: 4716 30006 CA BBANK
043698,000119: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
043699,000120: 4720 50002 INDEX Q
043700,000121: 4721 30000 CA 0
043701,000122: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
043702,000123: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
043703,000124: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
043704,000125: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
043705,000126: 4726 14643 TCF Q+10000
043706,000127:
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Page 996
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043708,000129: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
043709,000130:
043710,000131: # PSEUDO-FIXED OCTAL PSEUDO
043711,000132: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
043712,000133: # ---------- ------- ------------ ------------ ------------
043713,000134: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
043714,000135: # WILL USUALLY BE SEEN AS 11)
043715,000136: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
043716,000137: # ONLY BANKS 40-43 WILL EVER BE
043717,000138: # AND ARE PRESENTLY AVAILABLE)
043718,000139: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
043719,000140: # THE USER)
043720,000141: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
043721,000142: # THE USER)
043722,000143: # *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
043723,000144: # SUPERBANK SHOULD USE SUPERSW. ***
043724,000145:
043725,000146: # SUPERSW MAY BE CALLED IN THIS FASHION:
043726,000147: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
043727,000148: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
043728,000149: # ... ...
043729,000150: # . .
043730,000151: # . .
043731,000152: # OR IN THIS FASHION:
043732,000153: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
043733,000154: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
043734,000155: # ... ... SUPER011 OCTAL 60
043735,000156: # . . SUPER100 OCTAL 100
043736,000157: # . . SUPER101 OCTAL 120
043737,000158: # SUPER110 OCTAL 140
043738,000159:
043739,000160: 4727 00006 SUPERSW EXTEND
043740,000161: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
043741,000162: # CHANNEL 07
043742,000163: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
043743,000164: # TC SUPERSW
043744,000165:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc