From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-04-19 10:41:19
Maciej Witkowiak <ytm@elysium.pl> writes:
> You are right. I just checked that. This should work in C128 mode
> for writting, and in C64 mode $d500-ff behaves like unconnected
> space.
Why wouldn't it work for reading? If the address reads $ff, you can
connect another chip there, and the values are wired-anded together
(remember, this is NMOS logic, not CMOS). I don't remember if I made
use of this property in my MMU expansion for the C128 (4 RAM banks
instead of 2).
Marko
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