From: a.lawrence (alawrenc@sobeco.com)
Date: 10/02/92 

From: alawrenc@sobeco.com (a.lawrence)
Subject: Re: More than two serial lines
Date: Sat, 3 Oct 1992 01:18:23 GMT

In <NEGAARD.92Oct1231134@altair.aero.org> negaard@aero.org (Eric Negaard) writes:
>So now I have the first port on my card using IRQ5, and the second
>port is disabled. Can someone please tell me what the "right" way
>is to get four serial ports? Is there a way in Linux to find out
>which IRQs are in use?

Standard IRQ's IRQ 0 - Timer
                IRQ 1 - Keyboard
                IRQ 2 - slave 8259 (AT)
                IRQ 3 - COM2 / COM 4
                IRQ 4 - COM1 / COM 3
                IRQ 5 - (XT) Hard Disk (AT) LPT2
                IRQ 6 - Floppy Disk
                IRQ 7 - LPT1

    AT only IRQ 8 - Real time clock
                IRQ 9 - Re-direct to IRQ 2
                IRQ 10 - Not defined
                IRQ 11 - Not defined
                IRQ 12 - Not defined
                IRQ 13 - 80287
                IRQ 14 - Hard disk (AT)
                IRQ 15 - Not defined 

-- 
If any given program runs correctly, it is obsolete.
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