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From: veit@urk.gmd.de (Holger Veit)
Newsgroups: comp.unix.bsd.netbsd.misc
Subject: Re: EDO SIMMS on a AXPpci motherboard
Date: 4 Feb 1996 18:51:05 GMT
Organization: GMD - German National Research Center for Information Technology
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Message-ID: <4f2v6p$8q2@omega.gmd.de>
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Mark Blackman (markb) wrote:
: Just a simple question,
:
: do the standard EDO 72-pin SIMMS work on a AXPpci (alpha) motherboard?
:
: currently i have a cheap number cruncher in the form of a
:
: P5-133 + 64MB (EDO SIMMS) + FreeBSD 2.1
:
: for doing long-winded scattering calculations. However, I would
: like to use the Alpha
: for this sort of thing. Can i preserve my investment in memory
: and switch to an
:
: Alpha-275 + 64MB (EDO SIMMS) + NetBSD
:
EDO means, that the RAM has an internal buffer on chip which
allows interleaved data/address access, i.e. you may submit a new RAS
(or was it CAS?) address while the data buffers have still valid data.
This is possible if the chipset applies addresses in such a way.
Otherwise, an EDO RAM behaves like a normal RAM. So if your Alpha board
does not know about the special EDO feature, it will just see a normal
RAM. The only thing you should be concerned about then is whether the RAM
is fast enough for the board, and whether the board needs parity and the
RAM provides it.
--
Dr.-Ing. Holger Veit | INTERNET: Holger.Veit@gmd.de
| | / GMD - German National Research | Phone: (+49) 2241 14 2448
|__| / Center for Information Technology| Fax: (+49) 2241 14 2242
| | / Schloss Birlinghoven | "They're not sending back [Win95]
| |/ D-53754 Sankt Augustin, Germany | because it's not selling well; they
WWW: http://borneo.gmd.de/~veit/ | have overordered" (M$ spokesperson)