Hi Pete,
I can't help with your question, but you may want to post it on
comp.sys.ibm.ps2.hardware. There are a lot of extremely knowledgeable (if
not fanatical) MCA enthusiasts there (notably Peter Wendt, Louis Ohland,
and Bruce Lane) and the signal to noise ratio is high. The group helped me
a lot in reviving a PS/2 Model 8595 server last year.
Regards,
Mark "Now if only I could find some 1 by 4 static column ZIP DRAMs" Gregory
-----Original Message-----
From: Peter Pachla <peter.pachla_at_wintermute.org.uk>
To: Classic Computer <classiccmp_at_classiccmp.org>
Date: Thursday, April 13, 2000 1:36 PM
Subject: CPU upgrades, pt. II
>Anyone come across an "XTEND MICROPRODUCTS" processor upgrade card for MCA
>machines?
>
>I've found one inside my PS/2 Model 50, which I was previously unable to
>identify as the markings on the PCBs are hidden inside the "sandwich"
>IYKWIM.
>
>Anyway, it appears to replace the onboard '286(?) with a '486SLC (no real
>clues as to clock speed, but could be 25MHz) and has a socket next to the
>processor which I'm assuming is for a math co-processor?
>
>Would I be correct in assuming that the system will not start up if the
>72-pin SIMM sockets on the upgrade board are empty....I've never gotten
very
>far with this machine as I don't have any 72-pin SIMMs to try in it?
>
>
> TTFN - Pete.
>
>--
>Hardware & Software Engineer. Sound Engineer.
>Collector of Arcade Machines, Games Consoles & Obsolete Computers (esp
DEC)
>
>peter.pachla_at_wintermute.org.uk | www.wintermute.org.uk
>--
>
>
>
Received on Thu Apr 13 2000 - 15:33:00 BST