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- Path: andrew.cmu.edu!bo24+
- From: Berend Ozceri <bo24+@andrew.cmu.edu>
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: EDO RAM retrofit to RETINA Z-III
- Date: Sun, 4 Feb 1996 20:51:33 -0500
- Organization: Masters student, Electrical and Computer Engineering, Carnegie Mellon, Pittsburgh, PA
- Message-ID: <Al5K_Zu00iWY4184wM@andrew.cmu.edu>
- References: <jboros.40.002789D1@indirect.com>
- NNTP-Posting-Host: po9.andrew.cmu.edu
- In-Reply-To: <jboros.40.002789D1@indirect.com>
-
- Excerpts from netnews.comp.sys.amiga.hardware: 4-Feb-96 EDO RAM retrofit
- to RETINA .. by Jim Boros@indirect.com
- > I am considering a very agressive hack to my out of warranty Retina
- > ZIII.
- > Removing the 80NS Zipps and wiring in a socket to take a 72 Pin EDO simm at
- > 4MB. Anyone try this or anything like it. I can imagine getting some real
- > good speeds out of this. With these chips below $150 it is tempting. And
- > the ZIPS can go in the 3000 motherboard.
- > Any thoughts appreciated.
-
- It will get you absolutely nothing. 0% speed improvement.
-
- DRAM systems not designed with EDO in mind, cannot take advantage of
- these chips. EDO RAMs are faster because they can, in a sense, allow the
- DRAM controller to overlap portions of sequential cycles.
-
- EDO support has to be built into the DRAM controller (whether it is an
- integrated part, a bunch of chips, or just programmable logic). If it is
- not, then the EDO RAM will act like a regular RAM package. I really
- doubt the Retina ZIII has the necessary support to take advantage of EDO.
-
- So, in short, don't attempt this hack.
-
- Berend Ozceri
- Carnegie Mellon University
-
-