Re: 6502/6510 ROM selection daughterboard

Michał Pleban <lists@michau.name> writes:

> I was thinking of another approach - a 6502 running side by side on the
> cartridge, executing the same code as the main CPU. IIRC, 6502 and 6510
> are cycle-compatible, so this could be done easily. So one could easily
> detect writes to $01 and set the flags appropriately without playing
> crudely with the PLA lines.

You can't see the results of reads from $00/$01, so tape accesses and
anything that tries to detect the bit fading on the top two bits of $01
will throw you off.

-ik

       Message was sent through the cbm-hackers mailing list