Path: utzoo!mnetor!uunet!husc6!spdcc!dyer
From: dyer@spdcc.COM (Steve Dyer)
Newsgroups: comp.unix.xenix
Subject: Re: Drivers for COM3/COM4?
Message-ID: <534@spdcc.COM>
Date: 6 Jan 88 01:09:26 GMT
References: <143@mkunix.UUCP>
Organization: S.P. Dyer Computer Consulting, Cambridge MA
Lines: 22
Keywords: device,driver,sco,xenix,comm,serial,tty

In article <143@mkunix.UUCP>, tyager@mkunix.UUCP (Tom Yager ULTRIX SS) writes:
> 
> I'm looking for someone who has a working tty device driver for SCO
> Xenix '386. I've got a modem that is configurable as COM3 or COM4, but
> (of course) SCO doesn't know anything about this. I am aware of the
> >$500 multi-port boards, but that would be overkill for me: I just want
> to add one device. COM1 and COM2 are already occupied.

COM3: and COM4:, I believe, either don't use interrupt lines or they
share IRQ 4 and IRQ 3 which are ordinarily associated with COM1: and COM2:.
Anyway, on an IBM PC bus, you really can't have more than one device on
an interrupt level.  Your only option is to opt for overkill: if you can
disable either COM1 or COM2, you should be able to get by nicely with
a 4- or 8-port "dumb" serial card.  SCO XENIX has support for all sorts
of dumb serial boards built-in: Digiboard, Hostess, Stargate, AST, just to
name a few.  I use a Digiboard 4 port card very happily.  Or, you can get a
"smart" board, many of which use the additional AT interrupts, so you can
keep both COM1 and COM2, if you desire.
-- 
Steve Dyer
dyer@harvard.harvard.edu
dyer@spdcc.COM aka {ihnp4,harvard,husc6,linus,ima,bbn,m2c}!spdcc!dyer