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    PSIO Switch Board Installation Guide
            PU-18, Revision 1.3.
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 What Was Last Changed?
    - Revision 1.3 - Added an additional
                     power rail image since
                     some PU-18's have a
                     different PCB layout.

    - Revision 1.2 - The Parallel Port image
                     was changed.

    - Revision 1.1 - The CPU INT and CPU CS
                     lines were switched.

    - Revision 1.0 - First Release

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