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From: j@bonnie.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: IRQ 9 unsafe?
Date: 4 Jul 1995 09:03:29 +0200
Organization: Private U**x site, Dresden.
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Message-ID: <3tap41$892@bonnie.tcd-dresden.de>
References: <gztQkHQ@quack.kfu.com>
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Nick Sayer <nsayer@quack.kfu.com> wrote:
>I've been having some trouble with my ze card lately. The symprom is
>that it occasionally will quite simply wedge the net. I had it set
>to 0x280, 9, 0xd8000. I decided to move everything around, so I
>set it to 0x300, 11, 0xd4000. I suspect, however, that the problem
>might simply have been attempting to make use of IRQ 9, which I
>believe has some other use in ISA PCs. Anyone have any words of
>wisdom on this subject?
IRQ 2 has been used traditionally for the EGA vertical retrace
interrupt. Some VGA's are still able to generate it, but it's not in
common use. You can tell most VGA's to not generate it.
IRQ 2 on the bus is redirected to IRQ 9 since input #2 of the master
PIC (peripheral interrupt controller) is used to cascade the slave
PIC in AT-class machines.
--
cheers, J"org private: joerg_wunsch@uriah.heep.sax.de
http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)