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    SubjectRe: keyboard timeout
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    On Wed, 2004-12-01 at 17:29, linux-os wrote:
    > If Linux 2.6.9 is booted on a 40 MHz `486 with the standard
    > ISA clock of 14.3 MHz (yes that's the standard), the kernel
    > will complain about a keyboard timeout for every key touched!

    Umm, no.

    The BCLK signal, which is the system bus clock, is 4.77, 8.0, or 8.33
    MHz, depending on platform. There may be other non-standard frequencies
    in use. Since everything is referenced to this signal, I'd call it the
    ISA clock.

    You may be thinking of the OSC signal, which is 14.33MHz, and was used
    to generate the composite video signal on early CGA cards. It is not
    synchronized to any other signal. It is (was) also often divided by 12
    and fed to the 8254 PIT.

    As for your keyboard problem, I dunno. I just wanted to play "The find
    the subtle misconception in Dick's post" game.

    My reference: "ISA & EISA Theory & Operation" by Edward Solari.
    --
    Dave Dillow <dave@thedillows.org>

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