Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!ptimtc!nntp-server.caltech.edu!toddpw
From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: What mem.chips go in the ZIP cache?
Message-ID: <1991Jun11.040640.3827@nntp-server.caltech.edu>
Date: 11 Jun 91 04:06:40 GMT
References: <1991Jun10.231828.16904@risky.ecs.umass.edu>
Organization: California Institute of Technology, Pasadena
Lines: 23

giovin@medr3.ecs.umass.edu (Rocky J Giovinazzo) writes:

>Could someone with a ZIP please tell me exactly what chips are in his/her
>cache?  I can see from the A+/Incider advertisement that "MOSEL
>MS6264AL-70PC 8910K" are used in a pair apparently for an 8k cache.
>I am especially interested in what chips can be used to form a 32k or
>64k cache.

The important numbers in the about are the 6264 (means 8K SRAM) and the 70
(means 70ns access time). To get a 16K cache configuration you buy two more
chips and plug them in (don't forget to set the DIP switches).

For 32K or 64K configurations, the number is 62256 (32K SRAM). Getting these
faster than 100 ns (which is OK for 8 mhz CPUs) is not easy. You might be able
to find 80 ns chips in a mail order catalog.

BTW, you can call ZIP tech support and they will tell you what kind of chips
to get (watch out though, they are really patronizing until you convince them
you are a techie -- their default phone manner is the product of years of
trying to satisfy hordes of ungrateful clueless people).

Todd Whitesel
toddpw @ tybalt.caltech.edu