Re: 65c02 in an Apple II+? Different 65c02s

[dempson@actrix.gen.nz (David Empson)]

Dosius <steve@dosius.zzn.com> wrote:

> dempson@actrix.gen.nz (David Empson) wrote:
> > The Rockwell R65C02 instruction set is a superset of that used by the
> > WDC 65C02 (and clones thereof).  It should be perfectly capable of being
> > used in an Apple II and will run all software which expects a "standard"
> > 65C02.
> > 
> > The Rockwell variant adds 64 extra opcodes (all hex values x3, x7, xB
> > and xF) which deal with manipulating or testing individual bits in zero
> > page locations.
> 
> Hm, is the R65C02 compatible with the G65SC02?

I don't know who makes hte G65SC02, but as far as I am aware, there are
only two fundamental variants of the 65C02:

- The original one from Western Design Center (and clones thereof, such
as the GTE).

- The Rockwell R65C02.

The latter's instruction set is a superset of the former.

Any other brands should be a second source of either of the above, and
are most likely to be identical in functionality to the WDC 65C02.

-- 
David Empson
dempson@actrix.gen.nz