> 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.