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tweaked docs

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git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@80 4df02467-bbd4-4a76-a152-e7ce94205b78
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marcobaye 2016-12-29 12:02:12 +00:00
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5
docs/Help.txt
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@ -6,7 +6,7 @@
- free software -
(C) 1998-2014 Marco Baye
(C) 1998-2016 Marco Baye
----------------------------------------------------------------------
@ -14,7 +14,7 @@ Section: Copyright
----------------------------------------------------------------------
ACME - a crossassembler for producing 6502/6510/65c02/65816 code.
Copyright (C) 1998-2014 Marco Baye
Copyright (C) 1998-2016 Marco Baye
The ACME icon was designed by Wanja "Brix" Gayk
This program is free software; you can redistribute it and/or modify
@ -64,6 +64,7 @@ The files in the docs directory and what they contain:
QuickRef.txt All the basic stuff about ACME
Source.txt How to compile ACME
Upgrade.txt Incompatibilities to earlier versions
cputypes.txt Instruction sets of target CPUs
IMPORTANT: If you upgrade from ACME 0.05 or earlier, don't forget to
read the file "Upgrade.txt" - release 0.07 and all later ones are

44
docs/cputypes.txt
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@ -17,7 +17,8 @@ ACME supports the following cpu types:
This is the instruction set of the original NMOS 6502 designed by MOS
(later CSG).
There are 151 documented opcodes.
ACME does not use "A" to indicate "accumulator addressing"; just write
the mnemonic without any argument: "LSR" will work, "LSR A" won't.
@ -36,20 +37,20 @@ See "docs/Illegals.txt" for more info.
This is the CMOS re-design of the 6502. It seems to have also been
available from Rockwell, GTE/CMD and others. Features:
- new instructions:
BRA (branch always)
PHX, PHY, PLX, PLY (push/pull X/Y register)
STZ (store zero, 4 addr modes)
TRB (test and reset bits, 2 addr modes)
TSB (test and set bits, 2 addr modes)
BRA branch always
PHX/PHY/PLX/PLY push/pull X/Y register
STZ store zero, 4 addr modes
TRB test and reset bits, 2 addr modes
TSB test and set bits, 2 addr modes
- new addressing modes for existing instructions:
LDA/STA/ADC/SBC ($12) zp indirect
AND/ORA/EOR/CMP ($12) zp indirect
BIT #$12
BIT $12, x
BIT $1234, x
LDA/STA/ADC/SBC ($12) (zp indirect without index)
AND/ORA/EOR/CMP ($12) (zp indirect without index)
INC (increment accumulator)
DEC (decrement accumulator)
JMP ($1234,x) (jump indexed indirect)
INC increment accumulator
DEC decrement accumulator
JMP ($1234, x) x-indexed indirect
- bugfix for flags in decimal mode
- bugfix for JMP($xxff) instruction
- undocumented opcodes are NOPs (although of different lengths)
@ -61,10 +62,10 @@ There are 178 documented opcodes.
This is a superset of 65c02, probably originally from Rockwell.
- It adds bit manipulation instructions:
BBR0..BBR7 (branch on bit reset)
BBS0..BBS7 (branch on bit set)
RMB0..RMB7 (reset memory bit)
SMB0..SMB7 (set memory bit)
BBR0..BBR7 branch on bit reset
BBS0..BBS7 branch on bit set
RMB0..RMB7 reset memory bit
SMB0..SMB7 set memory bit
Chips with this instruction set seem to have been available from
Rockwell, GTE/CMD and others.
There are 210 documented opcodes.
@ -89,6 +90,7 @@ have been available from GTE/CMD as well). Features:
- block transfers
There are 256 documented opcodes, but one of them ("WDM") is reserved
for future expansion.
See "docs/65816.txt" for more info.
@ -103,6 +105,12 @@ This is a superset of r65c02, originating at CSG. Features:
There is a known bug: SBC does not work correctly in decimal mode.
There are 256 documented opcodes, but one of them ("AUG") is reserved
for future expansion.
ACME uses different mnemonics for old ("near") and new ("far") branch
instructions:
BEQ old, 8-bit offset
LBEQ new, 16-bit offset
The original datasheet called BRA ("branch always") BRU ("branch
unconditional") instead. ACME accepts both mnemonics.
@ -121,7 +129,7 @@ There are 256 documented opcodes.
This is the cpu in version 2 of the C64DTV. It uses a superset of the
6502 instruction set. Features:
- new instructions:
BRA $1234 (branch always)
SAC #$12 (set accumulator mapping)
SIR #$12 (set index register mapping)
BRA $1234 branch always
SAC #$12 set accumulator mapping
SIR #$12 set index register mapping
- support for some of the undocumented opcodes.