Re: 65c02 in ][+ problem

[david@uow.edu.au (David Wilson)]

"Server" <Server@aol.com> writes:
>I've got a II+ that I ran a 4Mhz 65802 on in the motherboard socket, with no
>problems.  I later put the 65802 in a Transwarp IIe, and ran it in the II+
>with no problems.  I believe that I read a long, long time ago that the
>65C02 was not a good replacement cpu for the II+ because of some instruction
>timing problems with the 65C02.  I know that the 65802 was a preferred
>replacement though.  Sorry I can't be more helpful, but it was a long time
>ago.

While the 65802 does do a better job of emulating the 6502 instruction timing
than the 65c02, the major problem with the 65c02 in the Apple ][+ is bus
timing (how long data must be ready before the 65c02 needs to read it).
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia