S-100 phantom (Was: RE: Northstar Horizon)

From: Bill Sudbrink <bill_at_chipware.com>
Date: Tue Nov 2 16:10:26 1999

> > So My Compupro RAM16 (64k static) in the NS* (system A) has all banks
> > enabled and if we hit e800H the FDC forces phantom/ and the ram16 is
> > deselected for that address.
> Ah... I see... Now, the 4FDC does not have any connection to
> pin 67, so it is not using phantom. But it should be easy to
> implement... Can I just take the /CS (-NOT- chip select) pin
> from the 2708 and wire it to 67? Maybe I need to -NOT- it first?

Exercising a little more brain power, I see I'll need to put a
diode in there to keep someone elses phantom from activating this
Received on Tue Nov 02 1999 - 16:10:26 GMT

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