176 lines
5.6 KiB
Plaintext
176 lines
5.6 KiB
Plaintext
# Copyright: Public domain.
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# Filename: INTER-BANK_COMMUNICATION.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 998-1001
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# Mod history: 2009-05-24 RSB Adapted from the corresponding
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# Luminary131 file, using page
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# images from Luminary 1A.
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# 2011-05-08 JL Removed workaround.
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
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# 16:27 JULY 14, 1969
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# Page 998
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# THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
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# CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
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BLOCK 02
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COUNT* $$/BANK
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BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
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INDEX Q # PICK UP CADR.
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CA 0
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INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
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# SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
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SWCALL TS L
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LXCH FBANK # SWITCH BANKS, SAVING RETURN.
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MASK LOW10 # GET SUB-ADDRESS OF CADR.
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XCH Q # A,L NOW CONTAINS DP RETURN.
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DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
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INDEX Q
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TC 10000 # SETTING Q TO SWRETURN.
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SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
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XCH FBANK # ARE PRESERVED FOR RETURN.
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XCH BUF2 +1
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TC BUF2
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# THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
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# FOLLOWING THE TC POSTJUMP INSTRUCTION.
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POSTJUMP XCH Q # SAVE INCOMING C(A).
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INDEX A # GET CADR.
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CA 0
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# BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
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BANKJUMP TS FBANK
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MASK LOW10
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XCH Q # RESTORING INPUT C(A) IF THIS WAS A
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Q+10000 INDEX Q # POSTJUMP.
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PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
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# Page 999
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# THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
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MAKECADR CAF LOW10
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MASK BUF2
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AD BUF2 +1
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TC Q
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SUPDACAL TS MPTEMP
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XCH FBANK # SET FBANK FOR DATA.
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EXTEND
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ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
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XCH MPTEMP # SUPERBANK IN BITS 7-5.
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MASK LOW10
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XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS
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INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
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EXTEND
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WRITE SUPERBNK # SET SUPERBANK FOR DATA.
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INDEX L
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CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
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XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
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EXTEND
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WRITE SUPERBNK # RESTORE SUPERBANK.
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RELINT
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TS FBANK # RESTORE FBANK.
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CA MPTEMP # RECOVER FIRST WORD OF DATA.
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RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
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# Page 1000
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# THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
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IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
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INDEX Q
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CAF 0
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INCR Q
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ISWCALLL TS L
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LXCH FBANK
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MASK LOW10
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XCH Q
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DXCH RUPTREG3
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INDEX Q
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TC 10000
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ISWRETRN XCH RUPTREG4
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XCH FBANK
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XCH RUPTREG4
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TC RUPTREG3
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# 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
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# L TC USPRCADR
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# L+1 CADR INTPRETX # INTPRETX IS THE INTERPRETIVE CODING
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# # RETURN IS TO L+2
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USPRCADR TS LOC # SAVE A
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CA BIT8
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TS EDOP # EXIT INSTRUCTION TO EDOP
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CA BBANK
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TS BANKSET # USER'S BBANK TO BANKSET
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INDEX Q
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CA 0
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TS FBANK # INTERPRETIVE BANK TO FBANK
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MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
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XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
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XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
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TCF Q+10000
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# Page 1001
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# THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS SUPERBANK SETTING.)
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#
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# PSEUDO-FIXED OCTAL PSEUDO
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# SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
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# --------- ------- ------------ ------------ ---------
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# SUPERBANK 3 OXX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
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# WILL USUALLY BE SEEN AS 11)
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# SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
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# ONLY BANKS 40-43 WILL EVER BE
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# AND ARE PRESENTLY AVAILABLE)
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# SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
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# THE USER)
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# SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
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# THE USER)
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# *** THIS ROUTINE MAY BE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
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# SUPERBANK SHOULD USE SUPERSW. ***
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#
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# SUPERSW MAY BE CALLED IN THIS FASHION:
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# CAF ABBCON WHERE -- ABBCON BBCON SOMETHING --
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# TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
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# ... ...
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# . .
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# . .
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# OR IN THIS FASHION:
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# CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
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# TCR SUPERSW SUPERBANK BIT CONSTANTS:
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# ... ... SUPER011 OCTAL 60
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# . . SUPER100 OCTAL 100
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# . . SUPER101 OCTAL 120
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# SUPER110 OCTAL 140
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SUPERSW EXTEND
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WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
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# CHANNEL 07
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TC Q # TC TO INSTRUCTION FOLLOWING
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# TC SUPERSW
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