Re: SSv5 + REU + T232?

From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-04-19 10:41:19

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    Maciej Witkowiak <> 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).
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