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From: tim@cit-vax.Caltech.Edu (Timothy L. Kay)
Newsgroups: comp.unix.i386
Subject: Third serial port
Message-ID: <12978@cit-vax.Caltech.Edu>
Date: 17 Dec 89 22:07:57 GMT
Reply-To: tim@cit-vax.UUCP (Timothy L. Kay)
Organization: California Institute of Technology
Lines: 16

I am having trouble installing a third serial port in my 386 running
ISC Unix/386.  I have the X5 update (new serial driver).  I have the
card set to IO address 3E8 (COM3), IRQ 2, and I have added appropriate
lines to /etc/conf/sdevice.d/asy and remade the kernel.

Unfortunately, I don't seem to be getting any interrupts from that
device.  All output seems to be at about one character per second,
which I would guess means that the driver is timing out.  No input
appears.

Does anybody know if it is possible to use IRQ 2 for a serial port?
Is it possible to share interrupts (can I put two ports on the same
interrupt and have it work)?

Thanks in advance,

Tim