Re: Zip GS questions

[Mark Wade <mwade@suffolk.lib.ny.us>]

On 11 Dec 1996 pubpc1@library.ucla.edu wrote:

> That is very true.  I have a Zip running at 13.75MHz.  The actual chips
> in the cache make up 64K (it used to be set at 64K).  The problem was,
> it would not run stable.  When I reset the DIP switch configuration to
> 16K of cache (even though the chips were still 64K w/all 4 sockets filled),
> the board became very stable.
>
> I have not noticed much of a performance hit compared to 13.75/64 and the
> extra megahertz definitely make it faster than when it was a 9/64.


If you set the DIP switches to 16k then that is all the cache that
was being used despite what was installed on the board.  Even though
you had 64k installed you were running as a 13.75/16 when you
changed the DIP switch.  For that speed you want 30-45 ns chips
in the DATA sockets and 15 ns chips in the TAG sockets.  With that
configuration there is a good chance you could bump the switch up
to 64k again.

Mark Wade
mwade@suffolk.lib.ny.us
mswade@delphi.com
m.wade7@genie.com