Source Code
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These source-code files are part of a reconstructed copy of Luminary 178, the
final release of the Apollo 14 Lunar Module (LM) Apollo Guidance Computer
(AGC) software.
The reconstruction began with source code of Zerlina 56, Luminary 210, and
Luminary 131, previously transcribed from digitized copies of those programs.
The code was created by combining the three, using Zerlina 56 as a base, since
it was based off of Luminary 183. The differences between the three were
carefully merged using the Luminary memos as a guide, with all changes made
after Luminary 178 being backed out. The reconstruction was verified by matching
memory-bank checksums to those listed in drawing 2021152N. Note that page numbers
in the reconstructed code match those for the baseline log section mentioned in
each file's changelog; the page numbers for a real Luminary 178 listing would
be different.
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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042982,000002: ## Copyright: Public domain.
042983,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
042984,000004: ## Purpose: A section of Luminary revision 178.
042985,000005: ## It is part of the reconstructed source code for the final
042986,000006: ## release of the flight software for the Lunar Module's
042987,000007: ## (LM) Apollo Guidance Computer (AGC) for Apollo 14. The
042988,000008: ## code has been recreated from copies of Zerlina 56, Luminary
042989,000009: ## 210, and Luminary 131, as well as many Luminary memos.
042990,000010: ## It has been adapted such that the resulting bugger words
042991,000011: ## exactly match those specified for Luminary 178 in NASA
042992,000012: ## drawing 2021152N, which gives relatively high confidence
042993,000013: ## that the reconstruction is correct.
042994,000014: ## Reference: pp. 989-992
042995,000015: ## Assembler: yaYUL
042996,000016: ## Contact: Ron Burkey <info@sandroid.org>.
042997,000017: ## Website: www.ibiblio.org/apollo/index.html
042998,000018: ## Mod history: 2019-08-14 MAS Created from Zerlina 56.
042999,000019:
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Page 989
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043001,000021: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
043002,000022: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
043003,000023:
043004,000024: 4616 BLOCK 02
043005,000025: 4616 COUNT* $$/BANK
043006,000026: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
043007,000027: 4617 50002 INDEX Q # PICK UP CADR.
043008,000028: 4620 30000 CA 0
043009,000029: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
043010,000030:
043011,000031: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
043012,000032:
043013,000033: 4622 54001 SWCALL TS L
043014,000034: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
043015,000035: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
043016,000036: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
043017,000037: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
043018,000038: 4627 50002 INDEX Q
043019,000039: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
043020,000040:
043021,000041: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
043022,000042: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
043023,000043: 4633 56134 XCH BUF2 +1
043024,000044: 4634 00133 TC BUF2
043025,000045:
043026,000046: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
043027,000047: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
043028,000048:
043029,000049: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
043030,000050: 4636 50000 INDEX A # GET CADR.
043031,000051: 4637 30000 CA 0
043032,000052:
043033,000053: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
043034,000054:
043035,000055: 4640 54004 BANKJUMP TS FBANK
043036,000056: 4641 75012 MASK LOW10
043037,000057: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
043038,000058: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
043039,000059: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
043040,000060:
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Page 990
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043042,000062: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
043043,000063:
043044,000064: 4645 35012 MAKECADR CAF LOW10
043045,000065: 4646 70133 MASK BUF2
043046,000066: 4647 60134 AD BUF2 +1
043047,000067: 4650 00002 TC Q
043048,000068:
043049,000069:
043050,000070: 4651 54135 SUPDACAL TS MPTEMP
043051,000071: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
043052,000072: 4653 00006 EXTEND
043053,000073: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
043054,000074: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
043055,000075: 4656 75012 MASK LOW10
043056,000076: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
043057,000077: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
043058,000078: 4661 00006 EXTEND
043059,000079: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
043060,000080: 4663 50001 INDEX L
043061,000081: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
043062,000082: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
043063,000083: 4666 00006 EXTEND
043064,000084: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
043065,000085: 4670 00003 RELINT
043066,000086: 4671 54004 TS FBANK # RESTORE FBANK.
043067,000087: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
043068,000088: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
043069,000089:
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Page 991
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043071,000091: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
043072,000092:
043073,000093: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
043074,000094: 4675 50002 INDEX Q
043075,000095: 4676 30000 CAF 0
043076,000096: 4677 24002 INCR Q
043077,000097:
043078,000098: 4700 54001 ISWCALLL TS L
043079,000099: 4701 22004 LXCH FBANK
043080,000100: 4702 75012 MASK LOW10
043081,000101: 4703 56002 XCH Q
043082,000102: 4704 52073 DXCH RUPTREG3
043083,000103: 4705 50002 INDEX Q
043084,000104: 4706 02000 TC 10000
043085,000105:
043086,000106: 4707 56073 ISWRETRN XCH RUPTREG4
043087,000107: 4710 56004 XCH FBANK
043088,000108: 4711 56073 XCH RUPTREG4
043089,000109: 4712 00072 TC RUPTREG3
043090,000110:
043091,000111: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
043092,000112:
043093,000113: # L TC USPRCADR
043094,000114: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
043095,000115: # RETURN IS TO L+2
043096,000116:
043097,000117:
043098,000118: 4713 54164 USPRCADR TS LOC # SAVE A
043099,000119: 4714 34744 CA BIT8
043100,000120: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
043101,000121: 4716 30006 CA BBANK
043102,000122: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
043103,000123: 4720 50002 INDEX Q
043104,000124: 4721 30000 CA 0
043105,000125: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
043106,000126: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
043107,000127: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
043108,000128: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
043109,000129: 4726 14643 TCF Q+10000
043110,000130:
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Page 992
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043112,000132: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
043113,000133: # PSEUDO-FIXED OCTAL PSEUDO
043114,000134: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
043115,000135: # ---------- ------- ------------ ------------ ------------
043116,000136:
043117,000137: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
043118,000138: # WILL USUALLY BE SEEN AS 11)
043119,000139: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
043120,000140: # ONLY BANKS 40-43 WILL EVER BE
043121,000141: # AND ARE PRESENTLY AVAILABLE)
043122,000142: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
043123,000143: # THE USER)
043124,000144: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
043125,000145: # THE USER)
043126,000146: # *** THIS ROUTINE MAYBE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
043127,000147: # SUPERBANK SHOULD USE SUPERSW. ***
043128,000148:
043129,000149: # SUPERSW MAYBE CALLED IN THIS FASHION:
043130,000150:
043131,000151: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
043132,000152: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
043133,000153: # ... ...
043134,000154: # . .
043135,000155: # . .
043136,000156:
043137,000157: # OR IN THIS FASHION :
043138,000158:
043139,000159: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
043140,000160: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
043141,000161: # ... ... SUPER011 OCTAL 60
043142,000162: # . . SUPER100 OCTAL 100
043143,000163: # . . SUPER101 OCTAL 120
043144,000164: # SUPER110 OCTAL 140
043145,000165:
043146,000166: 4727 00006 SUPERSW EXTEND
043147,000167: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
043148,000168: # CHANNEL 07
043149,000169: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
043150,000170: # TC SUPERSW
043151,000171:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc