Path: utzoo!attcan!uunet!ncrlnk!ncr-mpd!kentd
From: kentd@FtCollins.NCR.com (Kent.Dalton)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Zubair Z-Ram
Message-ID: <KENTD.90Oct12145722@zappa.FtCollins.NCR.com>
Date: 12 Oct 90 13:57:21 GMT
References: <3107@ryn.esg.dec.com> <377.271356aa@wsuiar.uucp>
Sender: uucp@ncr-mpd.FtCollins
Reply-To: Kent.Dalton@FtCollins.NCR.com
Organization: NCR Microelectronics, Ft. Collins, CO
Lines: 43
In-reply-to: mwjester@wsuiar.uucp's message of 10 Oct 90 22:13:14 GMT


> One of the nice things about the ZRAM upgrade is that the same board will
> work with any ST, as the MMU connection is on a cable. 

This is not exactly true. I have two 520's, one an old STm and the other
an STfm.

In the STm the ZRAM cable is significantly too short to reach the MMU
from the shifter and even if it were the IKBD processor is right over
the shifter box and the extra height of the ZRAM board keeps the
keyboard and case from being put back together properly.

Fortunately the board fits in the STfm properly, and since thats what
the original poster inquired about he shouldn't have problems either.

Quiz: Which comes in more flavors ST motherboards or Baskin-Robbins Ice
Cream? :^)

Three other tips for all STer's wanting to do RAM upgrades:

  1. Open the ST up _before_ you buy... My STfm, much to my chagrin, had
the video shifter soldered in rather than socketed. (That's why I tried it on
my old 520 first.) This meant I had to go to the extra trouble of
desoldering the shifter and putting in a new socket. 

  2. Another reason to open up the ST first is that some 520/1040's were
shipped with an MMU that can only address 1Mb max. I don't have the part
number memorized but if anyone is interested I can post the part number
of the "Good" MMU.
 
  3. Zubair highly recommends Samsung DRAMs for use with their product.
They strongly discourage use of Oki, Hyundai, and Micron brand chips
because they tend to load down the power supply excessively resulting in
erratic operation.

 
--
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/* Kent Dalton                     * EMail: Kent.Dalton@FtCollins.NCR.COM */
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