Re: 65816 chip in Apple IIe?

[salfter@salfter.dyndns.org (Scott Alfter)]

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In article <3D1BB733.5226CF40@topnow.com>,
Ross Archer  <archer@topnow.com> wrote:
>Looking at the specs of the 65C816, it looks like it's "mostly"
>pin-compatible
>with the 65C02 processor, but not entirely so.  It looks like maybe it
>might be
>possible to basically unplug the 65C02 from my IIe 
>and replace it with the 65816?  Has this been done with any measure of
>success,
>or will I cause a major thermonuclear event by so doing? :)

The 65816 is not a drop-in replacement for the 6502; your IIe won't run with
one in its socket.  The 65802 is a drop-in replacement that gives you the
same instruction set as the '816.

If you have a RamWorks, you could get the 65816 option board for it...you
unplug the processor and MMU (?) on the motherboard, plug the MMU into the
option board, plug the option board into the processor and MMU sockets on
the motherboard, and run a cable from the option board to your RamWorks.  In
native mode, all of the RamWorks memory is directly addressable.  Very
little software was written to take advantage of this setup, though; an
accelerator is more useful.  (Anybody have a RocketChip to unload?  I wish
now that I hadn't sold mine...:-) )

  _/_
 / v \  Scott Alfter (salfter@salfter.dyndns.org)
(IIGS(  http://salfter.dyndns.org
 \_^_/  rm -rf /bin/laden

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