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 Post subject: Need help building Pentium MMX VRM module (re: IBM PC)
PostPosted: Tue Jun 08, 2021 5:16 pm 

Joined: 02 Sep 2016
Posts: 185
I know this is questionable whether it belongs here or not, but seeing so many electronic projects here (and so many intelligent people!) I'm hoping that somebody might be able to help.

I've picked up an old IBM PC 350 computer which supported up to Pentium MMX CPUs. However, an external voltage regulator board was required and only included in models that included those CPUs from the factory.

The BIOS on all models seem to support the MMX CPUs and they work fine but without the regulator the Vcore is 3.3v instead of 2.8v.

I've posted more information (including multimeter measurements and datasheets) over at the Vogons forum:

If anybody is willing to help me at all it would be very greatly appreciated!

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