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    SubjectRe: Kernel Debugging Hardware
    Date
    > A parallel port would be easier than a serial one because all you would need
    > is a counter and a bit of TTL logic. The parallel port has its own 5 volt
    > supply pin, it has several signal pins which can be (ab)used for read and

    All you need is an old PC/XT or 286. You raise a chosen output, write the data
    byte and wait for an ACK, then repeat waiting for loss of ACK.

    Alan


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