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From: teg@orc.olivetti.com
Newsgroups: comp.sys.ibm.pc
Subject: RE: What are these SIMMs?
Message-ID: <35599@oliveb.olivetti.com>
Date: 5 Jan 89 22:07:25 GMT
Sender: news@oliveb.olivetti.com
Reply-To: teg@orc.olivetti.com ()
Organization: Olivetti Research Center, Menlo Park, CA
Lines: 14

Siemens has been shipping alot of 1 Megabyte dynamic RAM dip chips (DRAMs)
to the US recently.  SUN Microsystems has been using them instead of 
their regular Toshiba's recently.  For your intel motherboard to use
these with a 25MHz clock rate it probably uses a cache controller with
a few (32K, 64K, or 256K) very high speed (~20Ns) chips.  The SIMMS are
most likely run in page interleave mode with 1 wait state (0 waits are
possible with 20MHz CPU clock speeds...).  All of this is just speculation
based on what I have commonly seen.  Many intel boards run "safe" with
extra wait states... your machine may have 2 wait states and page interleaving.

Tom Griner    {decwrl, ucbvax, ...}!orc.olivetti.com!teg    frames 2 /dev/fb
TEG@Bionet-20.bio.net                  presto.ig.com!teg    flames 2 /dev/null
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