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Re: www.6502.org

Subject: Re: www.6502.org
From: "Wayne Johnston" <wjohnston@cmscada.com>
Date: 1999/11/25
Newsgroups: comp.sys.cbm, comp.sys.apple2, comp.sys.atari.8bit, comp.arch.embedded
Organization: Magma Communications Ltd.
References: <943140026.900207@iris.nyx.net> <383A9E19.359FB7CD@mail.uni-mainz.de> <IMA_3.40831$YI2.2011197@typ11.nn.bcandid.com> <cygrkiuj-1Dk17#0558@batcher.bog> <david.943429581@wraith>

David Wilson <david@uow.edu.au> wrote in message
news:david.943429581@wraith...
> zefram@daystrom.bog (Zefram Cochrane) writes:
> >Oooh. Err. I remember those funny instructions on the 6502. The parts
> >that I was using (10 y ago) had the inc and dec instructions swapped
> >round! (65C12 and 50743 IIRC)
>
> I don't remember any chips with broken inc/dec.

Mitsubishi made a microcontroller with a 6502 instruction set that had the
INC and DEC instructions opcodes swapped compared to the WDC 6502. It
included the 50734 and 50743 controllers. This caused me all sorts of
confusion when I took an assembler routine that worked on our 50734 native
assembler and used it as in-line assembly in a 6502 C compiler.

References:
- www.6502.org
  - From: mnaberez@nyx.nyx.net (Michael Naberezny)
- Re: www.6502.org
  - From: Andreas Magenheimer <magea000@mail.uni-mainz.de>
- Re: www.6502.org
  - From: Randy Shackelford <shack@onyx.southwind.net>
- Re: www.6502.org
  - From: zefram@daystrom.bog (Zefram Cochrane)
- Re: www.6502.org
  - From: david@uow.edu.au (David Wilson)

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