USB and IRQ question

From: Timothy Stone (citylists_at_petmystone.com)
Date: 09/29/03

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    To: redhat-list@redhat.com
Date: Mon, 29 Sep 2003 08:38:18 -0400

    List,

    I have read that USB chains are able to support 120+ devices. But my
    understanding of IRQs is that they are limited to 20 or so.

    There appears to some disparity. :) Then it occurred to me that the USB
    interrupt is but one IRQ. It's then up to USB to sort out the device on
    the chain.

    Would anyone mind elaborating just a little on this subject? Oh, is this
    also the general principle found on Micros~1 Windoze?

    Many thanks in advance,
    Tim 

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