Posted By
gerliczer
on 2010-08-28
03:38:25
|  Re: CPU replacement?
Hi Exin,
I think you meant this: http://www.baltissen.org/newhtm/10to816.htm. This is about replacing the 6510. If one wants to do this with the [7|8]501 it must be somewhat reworked but there are compatibility issues. This solution replaces a 65XX type processor with a 65cXX one, and since the latter fixed some quirks and introduced new instructions, it can't be considered drop-in replacment. There are software that builds on the oddities of the original part therefore it won't run correctly on the newer processor.
The [7|8]501 can't be replaced with 850[0|2] because those have different pinout and have one less processor I/O pin. To work it around like in the case of the 65cXX replacement project is not possible because one can't disable the processor I/O port so no matter what is done read/write of $00/$01 addresses will always access the integrated port.
The safest bet would be to cram a modified VHDL 6510 core into a CPLD (or a non-volatile FPGA if such thing exists) and replace the broken CPU with that.
Of course I'm not an expert so the real ones correct me if I'm wrong, please.
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