BigDumbDinosaur wrote:
What do you mean by “it is not working out”? Who is the manufacturer of the 65C02? Are you sure it actually is a 65C02?
wd65c02
That is all I know currently. However, since posting I may have figured out the problem. The 6502 has a very long (~300ns) delay from the time the R/!W goes low (for a write op) to when there is valid data on the data bus. That coupled with some assumptions I made, and I think this is causing the problem.
BigDumbDinosaur wrote:
There is plenty of info on line about logic family compatibility. A quick session in your favorite search engine should show the way.
I have been thrashing around the 'Net for a while, it is a hard topic to search, and I have yet to find a definitive answer (at least one that gives me confidence that I'm making the right choice, etc.)
BigDumbDinosaur wrote:
... As for the NMOS 6502, it operates at TTL levels, ...
This is the kind of info I'm looking for, so thanks!
Interestingly I have a lot of 80s era books for building your own computer, but they are all around the Z80, 8080, 8085, and 6809. Nothing in my library for the 6502, so I need to remedy that.