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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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