Apollo-11/Luminary099/INTER-BANK_COMMUNICATION.agc

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# Copyright: Public domain.
# Filename: INTER-BANK_COMMUNICATION.agc
# Purpose: Part of the source code for Luminary 1A build 099.
# It is part of the source code for the Lunar Module's (LM)
# Apollo Guidance Computer (AGC), for Apollo 11.
# Assembler: yaYUL
# Contact: Ron Burkey <info@sandroid.org>.
# Website: www.ibiblio.org/apollo.
# Pages: 998-1001
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# Mod history: 2009-05-24 RSB Adapted from the corresponding
# Luminary131 file, using page
# images from Luminary 1A.
# 2011-05-08 JL Removed workaround.
# This source code has been transcribed or otherwise adapted from
# digitized images of a hardcopy from the MIT Museum. The digitization
# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
# the Museum. Many thanks to both. The images (with suitable reduction
# in storage size and consequent reduction in image quality as well) are
# available online at www.ibiblio.org/apollo. If for some reason you
# find that the images are illegible, contact me at info@sandroid.org
# about getting access to the (much) higher-quality images which Paul
# actually created.
#
# Notations on the hardcopy document read, in part:
#
# Assemble revision 001 of AGC program LMY99 by NASA 2021112-061
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# 16:27 JULY 14, 1969
# Page 998
# THE FOLLOWING ROUTINE CAN BE USED TO CALL A SUBROUTINE IN ANOTHER BANK. IN THE BANKCALL VERSION, THE
# CADR OF THE SUBROUTINE IMMEDIATELY FOLLOWS THE TC BANKCALL INSTRUCTION, WITH C(A) AND C(L) PRESERVED.
BLOCK 02
COUNT* $$/BANK
BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
INDEX Q # PICK UP CADR.
CA 0
INCR Q # SO WE RETURN TO THE LOC. AFTER THE CADR.
# SWCALL IS IDENTICAL TO BANKCALL, EXCEPT THAT THE CADR ARRIVES IN A.
SWCALL TS L
LXCH FBANK # SWITCH BANKS, SAVING RETURN.
MASK LOW10 # GET SUB-ADDRESS OF CADR.
XCH Q # A,L NOW CONTAINS DP RETURN.
DXCH BUF2 # RESTORING INPUTS IF THIS IS A BANKCALL.
INDEX Q
TC 10000 # SETTING Q TO SWRETURN.
SWRETURN XCH BUF2 +1 # COMES HERE TO RETURN TO CALLER. C(A,L)
XCH FBANK # ARE PRESERVED FOR RETURN.
XCH BUF2 +1
TC BUF2
# THE FOLLOWING ROUTINE CAN BE USED AS A UNILATERAL JUMP WITH C(A,L) PRESERVED AND THE CADR IMMEDIATELY
# FOLLOWING THE TC POSTJUMP INSTRUCTION.
POSTJUMP XCH Q # SAVE INCOMING C(A).
INDEX A # GET CADR.
CA 0
# BANKJUMP IS THE SAME AS POSTJUMP, EXCEPT THAT THE CADR ARRIVES IN A.
BANKJUMP TS FBANK
MASK LOW10
XCH Q # RESTORING INPUT C(A) IF THIS WAS A
Q+10000 INDEX Q # POSTJUMP.
PRIO12 TCF 10000 # PRIO12 = TCF 10000 = 12000
# Page 999
# THE FOLLOWING ROUTINE GETS THE RETURN CADR SAVED BY SWCALL OR BANKCALL AND LEAVES IT IN A.
MAKECADR CAF LOW10
MASK BUF2
AD BUF2 +1
TC Q
SUPDACAL TS MPTEMP
XCH FBANK # SET FBANK FOR DATA.
EXTEND
ROR SUPERBNK # SAVE FBANK IN BITS 15-11, AND
XCH MPTEMP # SUPERBANK IN BITS 7-5.
MASK LOW10
XCH L # SAVE REL. ADR. IN BANK, FETCH SUPERBITS.
INHINT # BECAUSE RUPT DOES NOT SAVE SUPERBANK.
EXTEND
WRITE SUPERBNK # SET SUPERBANK FOR DATA.
INDEX L
CA 10000 # PINBALL (FIX MEM DISP) PREVENTS DCA HERE
XCH MPTEMP # SAVE 1ST WD, FETCH OLD FBANK AND SBANK.
EXTEND
WRITE SUPERBNK # RESTORE SUPERBANK.
RELINT
TS FBANK # RESTORE FBANK.
CA MPTEMP # RECOVER FIRST WORD OF DATA.
RETURN # 24 WDS. DATACALL 516 MU, SUPDACAL 432 MU
# Page 1000
# THE FOLLOWING ROUTINES ARE IDENTICAL TO BANKCALL AND SWCALL EXCEPT THAT THEY ARE USED IN INTERRUPT.
IBNKCALL DXCH RUPTREG3 # USES RUPTREG3,4 FOR DP RETURN ADDRESS.
INDEX Q
CAF 0
INCR Q
ISWCALLL TS L
LXCH FBANK
MASK LOW10
XCH Q
DXCH RUPTREG3
INDEX Q
TC 10000
ISWRETRN XCH RUPTREG4
XCH FBANK
XCH RUPTREG4
TC RUPTREG3
# 2. USPRCADR ACCESSES INTERPRETIVE CODING IN OTHER THAN THE USER'S FBANK. THE CALLING SEQUENCE IS AS FOLLOWS:
# L TC USPRCADR
# L+1 CADR INTPRETX INTPRETX IS THE INTERPRETIVE CODING
# RETURN IS TO L+2
USPRCADR TS LOC # SAVE A
CA BIT8
TS EDOP # EXIT INSTRUCTION TO EDOP
CA BBANK
TS BANKSET # USER'S BBANK TO BANKSET
INDEX Q
CA 0
TS FBANK # INTERPRETIVE BANK TO FBANK
MASK LOW10 # YIELDS INTERPRETIVE RELATIVE ADDRESS
XCH Q # INTERPRETIVE ADDRESS TO Q, FETCHING L+1
XCH LOC # L+1 TO LOC, RETRIEVING ORIGINAL A
TCF Q+10000
# Page 1001
# THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS SUPERBANK SETTING.)
# PSEUDO-FIXED OCTAL PSEUDO
# SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
# ---------- ------- ------------ ------------ ------------
#
# SUPERBANK 3 OXX 2000 - 3777 30 - 37 70000 - 107777 (WHERE XX CAN BE ANYTHING AND
# WILL USUALLY BE SEEN AS 11)
# SUPERBANK 4 100 2000 - 3777 40 - 47 110000 - 127777 (AS FAR AS IT CAN BE SEEN,
# ONLY BANKS 40-43 WILL EVER BE
# AND ARE PRESENTLY AVAILABLE)
# SUPERBANK 5 101 2000 - 3777 50 - 57 130000 - 147777 (PRESENTLY NOT AVAILABLE TO
# THE USER)
# SUPERBANK 6 110 2000 - 3777 60 - 67 150000 - 167777 (PRESENTLY NOT AVAILABLE TO
# THE USER)
# *** THIS ROUTINE MAYBE CALLED BY ANY PROGRAM LOCATED IN BANKS 00 - 27. I.E., NO PROGRAM LIVING IN ANY
# SUPERBANK SHOULD USE SUPERSW. ***
#
# SUPERSW MAYBE CALLED IN THIS FASHION:
#
# CAF ABBCON WHERE -- ABBCON BBCON SOMETHIN --
# TCR SUPERSW (THE SUPERBNK BITS ARE IN THE BBCON)
# ... ...
# . .
# . .
# OR IN THIS FASHION :
# CAF SUPERSET WHERE SUPERSET IS ONE OF THE FOUR AVAILABLE
# TCR SUPERSW SUPERBANK BIT CONSTANTS:
# ... ... SUPER011 OCTAL 60
# . . SUPER100 OCTAL 100
# . . SUPER101 OCTAL 120
# SUPER110 OCTAL 140
SUPERSW EXTEND
WRITE SUPERBNK # WRITE BITS 7-6-5 OF THE ACCUMULATOR INTO
# CHANNEL 07
TC Q # TC TO INSTRUCTION FOLLOWING
# TC SUPERSW
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