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| From: Richard Atkinson
Date: 1998-09-17
Subject: Re: 256K RAM expansions
|
> > Odd, Dave Haynie didn't mention that. What are the other two pins on the I/O
> > port used for?
>
> RTFS. The plus/4 uses the processor's on-chip I/O port mainly for the
> serial bus.
The plus/4's I/O port is actually only 7 bit, but curiously it isn't bit 7
that's left unconnected. The other pin not found on the 6510 is GATE, the exact function of which I don't know, but it has something to do with DRAM accessing.
Richard.
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