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    SubjectRe: Sharing IRQs between the first 4 serial ports.
    On Sun, 23 Nov 1997, Niels Kristian Bech Jensen wrote:

    > Traditionally IRQs have been assigned to the first four serial ports in
    > this way:
    >
    > COM1 4
    > COM2 3
    > COM3 4
    > COM4 3
    >
    > That is: sharing IRQs between COM 1/3 and COM 2/4.
    >
    > A de facto standard for internal modems seems to be:
    >
    > COM1 4
    > COM2 3
    > COM3 5
    > COM4 2
    >
    > That is: no IRQ sharing.
    >
    [SNIPPED]

    No, No, No. This is __very__ broken!

    IRQ2 is the cascade from the first interrupt controller to the
    second interrupt controller. The "wire" doesn't even exist on any
    bus. It is a connection, sometimes internal, between the two
    interrupt controllers.


    Cheers,
    Dick Johnson

    Richard B. Johnson
    Project Engineer
    Analogic Corporation
    Penguin : Linux version 2.1.65 on an i586 machine (66.15 BogoMips).
    Warning : It's hard to remain at the trailing edge of technology.


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