The real reason for this is to use a CFFA card in this machine,
which requires 65c02 but its not working correctly (yet)
I've worked with Rich Dreher on that problem for a while and I've also installed a Rockwell 65C02 in my IIplus with weird results.
It seems to work for a few seconds then looses the ability to do prodos commands. I've read old articles relating to issues with a
65C02 in a IIplus and the problem appears to be a memory timing issue. It may be possible to replace the 74LS257's at locations B6
and B7 on the main board with a faster version like a HCT series. I haven't tried this yet but I plan to within the next couple of
weeks.
Vince
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Replica I
The Apple I clone
http://www.applefritter.com/apple1/members/replica1/index.htm