https://github.com/virtualagc/virtualagc
Tip revision: 4e5d304eb7cd5589b924ffb8b423b6f15511b35d authored by Ron Burkey on 20 October 2018, 17:47:00 UTC
The sample Block I AGC program TRIVIUM, found at the very end of one of
The sample Block I AGC program TRIVIUM, found at the very end of one of
Tip revision: 4e5d304
INTER-BANK_COMMUNICATION.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: INTER-BANK_COMMUNICATION.agc
## Purpose: A section of Sunburst revision 37, or Shepatin revision 0.
## It is part of an early development version of the software
## for Apollo Guidance Computer (AGC) on the unmanned Lunar
## Module (LM) flight Apollo 5. Sunburst 37 was the program
## upon which Don Eyles's offline development program Shepatin
## was based; the listing herein transcribed was actually for
## the equivalent revision 0 of Shepatin.
## This file is intended to be a faithful transcription, except
## that the code format has been changed to conform to the
## requirements of the yaYUL assembler rather than the
## original YUL assembler.
## Reference: pp. 888-892
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2017-05-24 MAS Created from Sunburst 120.
## 2017-06-03 TVB Transcribed.
## 2017-06-14 HG Fix opcode CA -> DCA
## Add missing EXTEND
## 2017-06-23 RSB Proofed comment text with
## octopus/ProoferComments.
## Page 888
# 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
BANKCALL DXCH BUF2 # SAVE INCOMING A,L.
INDEX Q # PICK UP CADR.
BNKCAL+2 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.
BNKJUP+4 TCF 10000
## Page 889
# 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
# THE FOLLOWING ROUTINE OBTAINS THE TWO WORDS BEGINNING AT THE ADDRESS ARRIVING IN A, AND LEAVES THEM IN
# A,L. ENTER WITH A CADR IN A, AT DATACALL WITH JUNK IN L IF NOT SWITCHING SUPERBANKS, OTHERWISE AT SUPDACAL WITH
# SUPERBANK BITS IN BITS 7-5 IN L (BITS 15-8 AND 4-1 MAY BE JUNK). DEBRIS = MPTEMP. INHINTS FOR 180 MUSEC.
DATACALL TS L # SAVE CADR (SOLE INPUT HERE).
EXTEND
READ SUPERBNK # THIS PROLOGUE MAKES SUPERSWITCH VACUOUS.
XCH L # CADR IN A, SUPERBITS IN L.
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.
EXTEND
INDEX L
DCA 10000 # THIS IS SAFE EVEN IF CADR WAS END BANK.
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 890
# 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
## Page 891
# THE FOLLOWING SUBROUTINES PROVIDE TO THE BASIC PROGRAMMER ENTRY INTO AND RETURN FROM ANY INTERPRETIVE
# CODING WHICH DOES NOT USE THE ENTERING CONTENTS OF Q AND WHICH RETURNS VIA DANZIG. C(A) AND C(L) ARE SAVED.
# USER'S RESPONSIBILITY TO FILL IN ADVANCE THE APPROPRIATE OPERAND AND ADDRESS REGISTERS USED BY THE
# INTERPRETIVE CODING SUCH AS MPAC, BUF, ADDRWD, ETC.; AND TO CONFIRM THAT THE INTERPRETIVE CODING MEETS THE
# ABOVE RESTRICTIONS WITH RESPECT TO Q AND DANZIG.
# USEPRET AND USPRCADR MUST NOT BE USED IN INTERRUPT.
# 1. USEPRET ACCESSES INTERPRETIVE CODING WHICH CAN BE ENTERED WITHOUT CHANGING FBANK.
# THE CALLING SEQUENCE IS AS FOLLOWS:
# L TC USEPRET
# L+1 TC,TCF INTPRETX TC,TCF MEANS TC OR TCF
# INTPRETX IS THE INTERPRETIVE CODING
# RETURN IS TO L+2
# 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
USEPRET XCH Q # FETCH Q, SAVING A
TS LOC # L+1 TO LOC
CA BBANK
TS BANKSET # USER'S BBANK TO BANKSET
CA BIT8
TS EDOP # EXIT INSTRUCTION TO EDOP
CA Q # RETRIEVE ORIGINAL A
TC LOC
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 892
# THERE ARE FOUR POSSIBLE SETTINGS FOR CHANNEL 07. (CHANNEL 07 CONTAINS THE SUPERBANK SETTING.)
# PSEUDO-FIXED OCTAL PSEUDO
# SUPERBANK SETTING S-REG. VALUE BANK NUMBERS ADDRESSES
# --------- ------- ------------ ------------ ------------
# SUPERBANK 3 0XX 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 MAY BE 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
