Source Code
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This is a reconstructed version of Luminary 130, the initial AGC program released
in November 1969 for the Apollo 13 LM. Three more releases
followed before the flown revision was finally manufactured in February 1970.
This reconstruction was created from a previous transcription of the original listing of
Luminary 131, combined with Luminary memo #129 which describes the small difference
between the Luminary 130 and 131. The reconstructed source code was verified by
matching memory-bank checksums to those listed for Luminary 130 in drawing 2021152G.
In this source code, program comments from the original (Luminary 131) code are
prefixed with '#', while those added later by the Virtual AGC project are prefixed
with '##'.
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042760,000002: ## Copyright: Public domain.
042761,000003: ## Filename: INTER-BANK_COMMUNICATION.agc
042762,000004: ## Purpose: A section of the reconstructed source code for Luminary 130.
042763,000005: ## This was the original program released for the Apollo 13 LM,
042764,000006: ## although several more revisions would follow. It has been
042765,000007: ## reconstructed from a listing of Luminary 131, from which it
042766,000008: ## differs on only two lines in P70-P71. The difference is
042767,000009: ## described in detail in Luminary memo #129, which was used
042768,000010: ## to perform the reconstruction. This file is intended to be a
042769,000011: ## faithful reconstruction, except that the code format has been
042770,000012: ## changed to conform to the requirements of the yaYUL assembler
042771,000013: ## rather than the original YUL assembler.
042772,000014: ## Reference: pp. 992-995
042773,000015: ## Contact: Ron Burkey <info@sandroid.org>.
042774,000016: ## Website: www.ibiblio.org/apollo/index.html
042775,000017: ## Mod history: 05/30/03 RSB. Began transcribing.
042776,000018: ## 05/14/05 RSB Corrected website reference above.
042777,000019: ## 2011-05-07 JL Removed workaround.
042778,000020: ## 2017-01-06 RSB Page numbers now agree with those on the
042779,000021: ## original hardcopy, as opposed to the PDF page
042780,000022: ## numbers in 1701.pdf.
042781,000023: ## 2017-02-26 RSB Proofed comment text using octopus/ProoferComments.
042782,000024: ## 2017-03-13 RSB Comment-text fixes noted in proofing Luminary 116.
042783,000025: ## 2017-03-17 RSB Comment-text fixes identified in diff'ing
042784,000026: ## Luminary 99 vs Comanche 55.
042785,000027: ## 2018-09-04 MAS Copied from Luminary 131 for Luminary 130.
042786,000028: ## 2021-05-30 ABS ISWCALLL -> ISWCALL
042787,000029:
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Page 992
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042789,000031: # THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
042790,000032: # CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
042791,000033:
042792,000034: 4616 BLOCK 02
042793,000035: 4616 COUNT* $$/BANK
042794,000036: 4616 52134 BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
042795,000037: 4617 50002 INDEX Q # PICK UP CADR.
042796,000038: 4620 30000 CA 0
042797,000039: 4621 24002 INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
042798,000040:
042799,000041: # SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
042800,000042:
042801,000043: 4622 54001 SWCALL TS L
042802,000044: 4623 22004 LXCH FBANK # SWITCH BANKS, SAVING RETURN.
042803,000045: 4624 75012 MASK LOW10 # GET SUB-ADDRESS OF CADR.
042804,000046: 4625 56002 XCH Q # A,L NOW CONTAINS DP RETURN.
042805,000047: 4626 52134 DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
042806,000048: 4627 50002 INDEX Q
042807,000049: 4630 02000 TC 10000 # SETTING Q TO SWRETURN.
042808,000050:
042809,000051: 4631 56134 SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
042810,000052: 4632 56004 XCH FBANK # ARE PRESERVED FOR RETURN.
042811,000053: 4633 56134 XCH BUF2 +1
042812,000054: 4634 00133 TC BUF2
042813,000055:
042814,000056: # THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
042815,000057: # FOLLOWING THE TC POSTJUMP INSTRUCTION.
042816,000058:
042817,000059: 4635 56002 POSTJUMP XCH Q # SAVE INCOMING C(A).
042818,000060: 4636 50000 INDEX A # GET CADR.
042819,000061: 4637 30000 CA 0
042820,000062:
042821,000063: # BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
042822,000064:
042823,000065: 4640 54004 BANKJUMP TS FBANK
042824,000066: 4641 75012 MASK LOW10
042825,000067: 4642 56002 XCH Q # RESTORING INPUT C(A) IF THIS WAS A
042826,000068: 4643 50002 Q+10000 INDEX Q # POSTJUMP.
042827,000069: 4644 12000 PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
042828,000070:
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Page 993
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042830,000072: # THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
042831,000073:
042832,000074: 4645 35012 MAKECADR CAF LOW10
042833,000075: 4646 70133 MASK BUF2
042834,000076: 4647 60134 AD BUF2 +1
042835,000077: 4650 00002 TC Q
042836,000078:
042837,000079: 4651 54135 SUPDACAL TS MPTEMP
042838,000080: 4652 56004 XCH FBANK # SET FBANK FOR DATA.
042839,000081: 4653 00006 EXTEND
042840,000082: 4654 04007 ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
042841,000083: 4655 56135 XCH MPTEMP # SUPERBANK IN BITS 7-5.
042842,000084: 4656 75012 MASK LOW10
042843,000085: 4657 56001 XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
042844,000086: 4660 00004 INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
042845,000087: 4661 00006 EXTEND
042846,000088: 4662 01007 WRITE SUPERBNK # SET SUPERBANK FOR DATA.
042847,000089: 4663 50001 INDEX L
042848,000090: 4664 32000 CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
042849,000091: 4665 56135 XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
042850,000092: 4666 00006 EXTEND
042851,000093: 4667 01007 WRITE SUPERBNK # RESTORE SUPERBANK.
042852,000094: 4670 00003 RELINT
042853,000095: 4671 54004 TS FBANK # RESTORE FBANK.
042854,000096: 4672 30135 CA MPTEMP # RECOVER FIRST WORD OF DATA.
042855,000097: 4673 00002 RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
042856,000098:
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Page 994
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042858,000100: # THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
042859,000101:
042860,000102: 4674 52073 IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
042861,000103: 4675 50002 INDEX Q
042862,000104: 4676 30000 CAF 0
042863,000105: 4677 24002 INCR Q
042864,000106:
042865,000107: 4700 54001 ISWCALL TS L
042866,000108: 4701 22004 LXCH FBANK
042867,000109: 4702 75012 MASK LOW10
042868,000110: 4703 56002 XCH Q
042869,000111: 4704 52073 DXCH RUPTREG3
042870,000112: 4705 50002 INDEX Q
042871,000113: 4706 02000 TC 10000
042872,000114:
042873,000115: 4707 56073 ISWRETRN XCH RUPTREG4
042874,000116: 4710 56004 XCH FBANK
042875,000117: 4711 56073 XCH RUPTREG4
042876,000118: 4712 00072 TC RUPTREG3
042877,000119:
042878,000120: # 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
042879,000121: # L TC USPRCADR
042880,000122: # L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
042881,000123: # RETURN IS TO L+2
042882,000124:
042883,000125: 4713 54164 USPRCADR TS LOC # SAVE A
042884,000126: 4714 34744 CA BIT8
042885,000127: 4715 54023 TS EDOP # EXIT INSTRUCTION TO EDOP
042886,000128: 4716 30006 CA BBANK
042887,000129: 4717 54165 TS BANKSET # USER'S BBANK TO BANKSET
042888,000130: 4720 50002 INDEX Q
042889,000131: 4721 30000 CA 0
042890,000132: 4722 54004 TS FBANK # INTERPRETIVE BANK TO FBANK
042891,000133: 4723 75012 MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
042892,000134: 4724 56002 XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
042893,000135: 4725 56164 XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
042894,000136: 4726 14643 TCF Q+10000
042895,000137:
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Page 995
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042897,000139: # THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
042898,000140:
042899,000141: # PSEUDO-FIXED OCTAL PSEUDO
042900,000142: # SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
042901,000143: # ---------- ------- ------------ ------------ ------------
042902,000144: # SUPERBANK 3 0XX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
042903,000145: # WILL USUALLY BE SEEN AS 11)
042904,000146: # SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
042905,000147: # ONLY BANKS 40-43 WILL EVER BE
042906,000148: # AND ARE PRESENTLY AVAILABLE)
042907,000149: # SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
042908,000150: # THE USER)
042909,000151: # SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
042910,000152: # THE USER)
042911,000153: # *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
042912,000154: # SUPERBANK SHOULD USE SUPERSW. ***
042913,000155:
042914,000156: # SUPERSW MAY BE CALLED IN THIS FASHION:
042915,000157: # CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
042916,000158: # TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
042917,000159: # ... ...
042918,000160: # . .
042919,000161: # . .
042920,000162: # OR IN THIS FASHION:
042921,000163: # CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
042922,000164: # TCR SUPERSW SUPERBANK BIT CONSTANTS:
042923,000165: # ... ... SUPER011 OCTAL 60
042924,000166: # . . SUPER100 OCTAL 100
042925,000167: # . . SUPER101 OCTAL 120
042926,000168: # SUPER110 OCTAL 140
042927,000169:
042928,000170: 4727 00006 SUPERSW EXTEND
042929,000171: 4730 01007 WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
042930,000172: # CHANNEL 07
042931,000173: 4731 00002 TC Q # TC TO INSTRUCTION FOLLOWING
042932,000174: # TC SUPERSW
042933,000175:
End of include-file INTER-BANK_COMMUNICATION.agc. Parent file is MAIN.agc