CPU upgrades, pt. II - test-drb@ccmp.vtda.org

13 Apr 2000

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 &lt;peter.pachla(a)wintermute.org.uk&gt;
To: Classic Computer &lt;classiccmp(a)classiccmp.org&gt;
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(a)wintermute.org.uk            | www.wintermute.org.uk
--