Re: Plus/4 CPU

From: john/lori (
Date: 2001-02-08 18:09:11

> the x501 might
> need an additional gate on the R/W line that is controlled by the "gate in"
> pin. Though my machines were working fine even with the gate in disconnected,
> which affected the R/W timing only a little bit.

Do you know or is it known exactly what gate in does?

I haven't been able to find any detail about it.

> PS: I have headaches when I think about the recently discovered behaviour of
> writes/reads to unconnected bits of adresses 0/1. IIRC, the data direction
> bit is connected, but the data port bit itself is not.

why would this be a problem?

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