Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!spool.mu.edu!news.nd.edu!mentor.cc.purdue.edu!purdue!haven!umbc3!gmuvax2!lshih
From: lshih@gmuvax2.gmu.edu (Lieh-Wen Shih)
Newsgroups: comp.unix.xenix.sco
Subject: Re: Configuring COM3 - xenix ignores me
Keywords: COM ports, serial ports
Message-ID: <3800@gmuvax2.gmu.edu>
Date: 15 Mar 91 23:46:06 GMT
References: <4628@dftsrv.gsfc.nasa.gov>
Reply-To: lshih@gmuvax2.UUCP (Lieh-Wen Shih)
Organization: George Mason Univ. Fairfax, Va.
Lines: 19


OK, I had the exact same problem but I finally managed to "cheat" it
out.  Now, first thing to ask is: do you need all three ports under
Xenix?  If yes, skip this article.  If no, then my experience may be of
help.  Simply speaking, I just changed the address of COM1 in
sioconf.c to the actual address of COM3.  Since they share the same IRQ,
there's no problem to tell Xenix to look for another address.  Of
course, you then lose one port (the real COM1).  Put into steps:

	1. modify sioconf.c: change the address of COM1 to that of COM3.
	   (or COM2 to COM4).  In my case, I changed 2e8 to 3e8.
	2. re-compile kernel.
	3. put kernel in root  --- done!

Remember, after you do this, COM1 (tty1A/a) of Xenix is actually the
COM3.  But Xenix can just use it.  In my case, it works fine.

Levin
lshih@gmuvax2.gmu.edu