6502/acme
1
0
Fork 0
mirror of https://github.com/uffejakobsen/acme.git synced 2024-06-28 08:29:29 +00:00
Code Issues Projects Releases Wiki Activity

tweaked docs

Browse Source 
git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@80 4df02467-bbd4-4a76-a152-e7ce94205b78
This commit is contained in:
marcobaye 2016-12-29 12:02:12 +00:00
parent 90dd2e0a36
commit 4979302d0d
2 changed files with 29 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
docs/Help.txt
View File

@ -6,7 +6,7 @@
- free software - - 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. 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 The ACME icon was designed by Wanja "Brix" Gayk
This program is free software; you can redistribute it and/or modify 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 QuickRef.txt All the basic stuff about ACME
Source.txt How to compile ACME Source.txt How to compile ACME
Upgrade.txt Incompatibilities to earlier versions 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 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 read the file "Upgrade.txt" - release 0.07 and all later ones are

44
docs/cputypes.txt
View File

@ -17,7 +17,8 @@ ACME supports the following cpu types:
This is the instruction set of the original NMOS 6502 designed by MOS This is the instruction set of the original NMOS 6502 designed by MOS
(later CSG). (later CSG).
There are 151 documented opcodes. 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 This is the CMOS re-design of the 6502. It seems to have also been
available from Rockwell, GTE/CMD and others. Features: available from Rockwell, GTE/CMD and others. Features:
- new instructions: - new instructions:
BRA (branch always) BRA branch always
PHX, PHY, PLX, PLY (push/pull X/Y register) PHX/PHY/PLX/PLY push/pull X/Y register
STZ (store zero, 4 addr modes) STZ store zero, 4 addr modes
TRB (test and reset bits, 2 addr modes) TRB test and reset bits, 2 addr modes
TSB (test and set bits, 2 addr modes) TSB test and set bits, 2 addr modes
- new addressing modes for existing instructions: - new addressing modes for existing instructions:
LDA/STA/ADC/SBC ($12) zp indirect
AND/ORA/EOR/CMP ($12) zp indirect
BIT #$12 BIT #$12
BIT $12, x BIT $12, x
BIT $1234, x BIT $1234, x
LDA/STA/ADC/SBC ($12) (zp indirect without index) INC increment accumulator
AND/ORA/EOR/CMP ($12) (zp indirect without index) DEC decrement accumulator
INC (increment accumulator) JMP ($1234, x) x-indexed indirect
DEC (decrement accumulator)
JMP ($1234,x) (jump indexed indirect)
- bugfix for flags in decimal mode - bugfix for flags in decimal mode
- bugfix for JMP($xxff) instruction - bugfix for JMP($xxff) instruction
- undocumented opcodes are NOPs (although of different lengths) - 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. This is a superset of 65c02, probably originally from Rockwell.
- It adds bit manipulation instructions: - It adds bit manipulation instructions:
BBR0..BBR7 (branch on bit reset) BBR0..BBR7 branch on bit reset
BBS0..BBS7 (branch on bit set) BBS0..BBS7 branch on bit set
RMB0..RMB7 (reset memory bit) RMB0..RMB7 reset memory bit
SMB0..SMB7 (set memory bit) SMB0..SMB7 set memory bit
Chips with this instruction set seem to have been available from Chips with this instruction set seem to have been available from
Rockwell, GTE/CMD and others. Rockwell, GTE/CMD and others.
There are 210 documented opcodes. There are 210 documented opcodes.
@ -89,6 +90,7 @@ have been available from GTE/CMD as well). Features:
- block transfers - block transfers
There are 256 documented opcodes, but one of them ("WDM") is reserved There are 256 documented opcodes, but one of them ("WDM") is reserved
for future expansion. 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 is a known bug: SBC does not work correctly in decimal mode.
There are 256 documented opcodes, but one of them ("AUG") is reserved There are 256 documented opcodes, but one of them ("AUG") is reserved
for future expansion. 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 This is the cpu in version 2 of the C64DTV. It uses a superset of the
6502 instruction set. Features: 6502 instruction set. Features:
- new instructions: - new instructions:
BRA $1234 (branch always) BRA $1234 branch always
SAC #$12 (set accumulator mapping) SAC #$12 set accumulator mapping
SIR #$12 (set index register mapping) SIR #$12 set index register mapping
- support for some of the undocumented opcodes. - support for some of the undocumented opcodes.