Messages in this thread | | | Date | Mon, 24 Nov 1997 08:25:09 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Sharing IRQs between the first 4 serial ports. |
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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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