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> can you simply exchange an existing 6502 NMOS processor with a 65C
> CMOS processor - without changing any of the other hardware ?
Since you want the simple-terms answer, it is that in most cases, it's no problem.
> I want the 102 variant because of the extended instruction set (PHX and
> PHY and those other Branch instructions should have been conceived
> originally in my mind).
WDC's 65c02 has all those instructions and more, and has the extra bus signals that California Micro Devices' G65SC102 had also. Mike Naberezny has them in stock and you can buy them from him on this website.
If you want more instructions though, for only another dollar or so you might as well go for the 65816, which permits you (but does not force you) to use 16-bit A, X, Y, and S, move the direct page around instead of requiring that it be zero page, and use a 24-bit address space, and has instructions to facilitate code relocation, block memory moves, multitasking, etc.. You get a lot more bang for the buck. To reduce the intimidation factor, you can initially treat it like a 6502, and begin using new features gradually as you learn them.
Of course I should point out that the '816 definitely will not work in a socket intended for the '02. The changes are few however, so you could make a board with a few jumpers to select which uP you'll be plugging in, so the same board could be used for either one.
> Hey better still - is there and NMOS "102" variant - that runs at 2Mhz - > even better!!
I think all the WDC 65c02's made now will run at 14MHz minimum, and typically more. The 2MHz days are gone.
Garth
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