Re: Overclocking VAXen

From: Chris Scheers (chris_at_applied-synergy.com)
Date: 05/23/03

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    Date: Thu, 22 May 2003 17:33:12 -0500

    "Holi - Holitska András" wrote:
    >
    > Hi Everyone!
    >
    > I was just wondering... anybody around here, who has done
    > some overclocking on VAXen?
    >
    > I know, I know. It's dangerous, and unsupported, but now
    > that summer is comming I might have some spare time, and
    > I tought why not power-up one of my VLC-s if possible
    > (or some other, not so new VAX) - poor thing. :D
    >
    > Has anyone done/tried doing something similar? If yes,
    > what was the result?
    >
    > Any info apprechiated (yikes, my english needs some power-up too)
    >
    > Thanks, regards: <Holi>

    I don't know if it really counts as overclocking, but some VAXstation
    3100-30/40s (~2.7 VUPS) can be converted to VAXstation 3100-38/48s (~4
    VUPS).

    To do this, locate the 44MHz crystal. Replace this with a 66MHz
    crystal. There is also a jumper (wait state?) that must be changed. I
    don't remember exactly where it was, but it was near one of the corners
    of the board.

    Disclaimer: Do this at your own risk. Attempting these modifications
    may turn your computer into a non-computer. These instructions may or
    may not have anything to do with reality, but are probably the result of
    a halucination.

    Does anyone know how to change a VAXstation 4000-90 to a -90A? (or -90B,
    -90C, etc. <grin>)

    -----------------------------------------------------------------------
    Chris Scheers, Applied Synergy, Inc.

    Voice: 817-237-3360 Internet: chris@applied-synergy.com
      Fax: 817-237-3074

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