Re: Difference between 6502 & 65C02

[david@wraith.its.uow.edu.au (David E A Wilson)]

>In article <96082.140914JCA31@MAINE.MAINE.EDU> <JCA31@MAINE.MAINE.EDU> writes:
>>I'd like to know what it is that's different between these two cpu's,
>>apart from one being a CMOS chip. I'm also curious as to why I my II+
>>'sort-of' works with a 'C02 in it. I'd think that the machine would
>>either run, or crash miserably, but instead, it just seems to have
>>trouble keeping track of numbers ..?something to do with operating
>>modes, maybe?

For more details on this problem read page 4-22 of Jim Sather's Understanding
the Apple IIe (yes the IIe and not his earlier book the II). He managed to
get an Apple II working with a Rockwell R65C02P1 (1 MHz) while the
NCR 65C02A and GTE G65SC02P-2 both caused crashes. The crashes occured
with particular instruction sequences and video data values.

Alternatively a Zip chip will give you an accelerated 65c02 in a II or II+.
-- 
David Wilson	Dept CompSci Uni Wollongong Australia	david@cs.uow.edu.au