Documentation for a 256KM

[Allison]

>
>Subject: Re: Documentation for a 256KM
>   From: Michael Hart <imsaicollector at yahoo.com>
>   Date: Thu, 19 Mar 2009 11:26:45 -0700 (PDT)
>     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>I found another date on the board. The board was made in 1983 WOW!!!
>I can only imagine that it was very expensive in those days. 1 MB on a single S100 card
>
>--- On Thu, 3/19/09, Michael Hart <imsaicollector at yahoo.com> wrote:
>From: Michael Hart <imsaicollector at yahoo.com>
>Subject: Documentation for a 256KM
>To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>Date: Thursday, March 19, 2009, 2:13 PM
>
>Hello everyone
>Does any one know about or have documentation to the
>S C Digital MODEL - 256 KM 
>
>256K/1M RAM board.
>
>Mine is populated with 256 K dynamic RAM so it has 1 MB RAM.
>
>I don't have documentation so my attempt to repair it was to replace all
>the DRAM on board. 
>that did not work. The parity error LED stills comes on. So in my attempt to
>repair the board I definitely need the documentation.
>
>Given that I remember something about issues using DRAM card on early S100
>cards. I am guessing these SC Digital solved the problem since the board was
>made as best as I can make out on the silkscreen in 1988
>
>Michael Hart
>
>

the parity light comming on at start is normal.  the parity bit hasn't been 
written with anything sensible yet as rams start up random.

Allison


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