Re: 6502 Vs. 65C02 Vs. 65-series

["Peter de Vroomen" <peterv[at][spamblock]jaytown[dot]com>]

> I understand the 6502 and the 65C02 are pin for pin identical
> processors, but the 65C02 can be clocked faster. I understand too that
> all the 65-series processors share the same instruction set. If this
> is true, how hard would it be to upgrade the original 6502 with a
> 16-bit or 32-bit processor. The processor would then be able to use
> the lower 8-bits to drive 64K addresses, and the upper bits to give it
> an additional 64K or 128K.

Do a Google search on 65c816 and 6502...

The biggest problem is not hardware, but software. In the olden days,
timings weren't implemented by using a timer/clock, but by executing a loop.
This loop is going to be executed faster with a faster processor, which
means all these kinds of loops in the software will have to be patched. And
with only a binary rom, this is pretty tricky. You could disassemble the
rom, but you would still have to fully document it before you know what's
going on.

PeterV