Source Code
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These source-code files are part of a reconstructed copy of Luminary 163, the
first (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 173. Changes
between revision 163 and 173 were backed out, as described by Luminary memos 157
and 158. 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 163 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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042830,000002: ## Copyright: Public domain.
042831,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
042832,000004: ## Purpose: A section of Luminary revision 163.
042833,000005: ## It is part of the reconstructed source code for the first
042834,000006: ## (unflown) release of the flight software for the Lunar
042835,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
042836,000008: ## The code has been recreated from a reconstructed copy of
042837,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
042838,000010: ## It has been adapted such that the resulting bugger words
042839,000011: ## exactly match those specified for Luminary 163 in NASA
042840,000012: ## drawing 2021152N, which gives relatively high confidence
042841,000013: ## that the reconstruction is correct.
042842,000014: ## Reference: pp. 989-992
042843,000015: ## Assembler: yaYUL
042844,000016: ## Contact: Ron Burkey <info@sandroid.org>.
042845,000017: ## Website: www.ibiblio.org/apollo/index.html
042846,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
042847,000019: ## 2021-05-30 ABS ISWCALLL -> ISWCALL
042848,000020:
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Page 989
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042850,000022: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
042851,000023: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
042852,000024:
042853,000025: 4616 BLOCK 02
042854,000026: 4616 COUNT* $$/BANK
042855,000027: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
042856,000028: 4617 50002 INDEX Q # PICK UP CADR.
042857,000029: 4620 30000 CA 0
042858,000030: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
042859,000031:
042860,000032: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
042861,000033:
042862,000034: 4622 54001 SWCALL TS L
042863,000035: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
042864,000036: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
042865,000037: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
042866,000038: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
042867,000039: 4627 50002 INDEX Q
042868,000040: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
042869,000041:
042870,000042: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
042871,000043: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
042872,000044: 4633 56134 XCH BUF2 +1
042873,000045: 4634 00133 TC BUF2
042874,000046:
042875,000047: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
042876,000048: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
042877,000049:
042878,000050: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
042879,000051: 4636 50000 INDEX A # GET CADR.
042880,000052: 4637 30000 CA 0
042881,000053:
042882,000054: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
042883,000055:
042884,000056: 4640 54004 BANKJUMP TS FBANK
042885,000057: 4641 75012 MASK LOW10
042886,000058: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
042887,000059: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
042888,000060: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
042889,000061:
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Page 990
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042891,000063: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
042892,000064:
042893,000065: 4645 35012 MAKECADR CAF LOW10
042894,000066: 4646 70133 MASK BUF2
042895,000067: 4647 60134 AD BUF2 +1
042896,000068: 4650 00002 TC Q
042897,000069:
042898,000070:
042899,000071: 4651 54135 SUPDACAL TS MPTEMP
042900,000072: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
042901,000073: 4653 00006 EXTEND
042902,000074: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
042903,000075: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
042904,000076: 4656 75012 MASK LOW10
042905,000077: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
042906,000078: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
042907,000079: 4661 00006 EXTEND
042908,000080: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
042909,000081: 4663 50001 INDEX L
042910,000082: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
042911,000083: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
042912,000084: 4666 00006 EXTEND
042913,000085: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
042914,000086: 4670 00003 RELINT
042915,000087: 4671 54004 TS FBANK # RESTORE FBANK.
042916,000088: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
042917,000089: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
042918,000090:
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Page 991
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042920,000092: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
042921,000093:
042922,000094: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
042923,000095: 4675 50002 INDEX Q
042924,000096: 4676 30000 CAF 0
042925,000097: 4677 24002 INCR Q
042926,000098:
042927,000099: 4700 54001 ISWCALL TS L
042928,000100: 4701 22004 LXCH FBANK
042929,000101: 4702 75012 MASK LOW10
042930,000102: 4703 56002 XCH Q
042931,000103: 4704 52073 DXCH RUPTREG3
042932,000104: 4705 50002 INDEX Q
042933,000105: 4706 02000 TC 10000
042934,000106:
042935,000107: 4707 56073 ISWRETRN XCH RUPTREG4
042936,000108: 4710 56004 XCH FBANK
042937,000109: 4711 56073 XCH RUPTREG4
042938,000110: 4712 00072 TC RUPTREG3
042939,000111:
042940,000112: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
042941,000113:
042942,000114: # L TC USPRCADR
042943,000115: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
042944,000116: # RETURN IS TO L+2
042945,000117:
042946,000118:
042947,000119: 4713 54164 USPRCADR TS LOC # SAVE A
042948,000120: 4714 34744 CA BIT8
042949,000121: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
042950,000122: 4716 30006 CA BBANK
042951,000123: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
042952,000124: 4720 50002 INDEX Q
042953,000125: 4721 30000 CA 0
042954,000126: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
042955,000127: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
042956,000128: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
042957,000129: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
042958,000130: 4726 14643 TCF Q+10000
042959,000131:
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Page 992
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042961,000133: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
042962,000134: # PSEUDO-FIXED OCTAL PSEUDO
042963,000135: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
042964,000136: # ---------- ------- ------------ ------------ ------------
042965,000137:
042966,000138: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
042967,000139: # WILL USUALLY BE SEEN AS 11)
042968,000140: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
042969,000141: # ONLY BANKS 40-43 WILL EVER BE
042970,000142: # AND ARE PRESENTLY AVAILABLE)
042971,000143: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
042972,000144: # THE USER)
042973,000145: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
042974,000146: # THE USER)
042975,000147: # *** THIS ROUTINE MAYBE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
042976,000148: # SUPERBANK SHOULD USE SUPERSW. ***
042977,000149:
042978,000150: # SUPERSW MAYBE CALLED IN THIS FASHION:
042979,000151:
042980,000152: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
042981,000153: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
042982,000154: # ... ...
042983,000155: # . .
042984,000156: # . .
042985,000157:
042986,000158: # OR IN THIS FASHION :
042987,000159:
042988,000160: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
042989,000161: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
042990,000162: # ... ... SUPER011 OCTAL 60
042991,000163: # . . SUPER100 OCTAL 100
042992,000164: # . . SUPER101 OCTAL 120
042993,000165: # SUPER110 OCTAL 140
042994,000166:
042995,000167: 4727 00006 SUPERSW EXTEND
042996,000168: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
042997,000169: # CHANNEL 07
042998,000170: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
042999,000171: # TC SUPERSW
043000,000172:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc