Path: utzoo!attcan!uunet!husc6!bloom-beacon!mit-eddie!uw-beaver!fluke!mason
From: mason@tc.fluke.COM (Nick Mason)
Newsgroups: comp.sys.ibm.pc
Subject: Re: serial port on PS/2
Message-ID: <5146@fluke.COM>
Date: 12 Sep 88 16:01:31 GMT
References: <1410@bingvaxu.cc.binghamton.edu>
Sender: news@tc.fluke.COM
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Lines: 39

In article <1410@bingvaxu.cc.binghamton.edu> sullivan@marge.math.binghamton.edu (fred sullivan) writes:
>We can't get the serial board to work with an AT cable.  Our theory
>is that Big Blue changed the pin assignments.  Is this the case?  If
>so, does anyone know the new pin assignments?  Or where we can buy a
>cable?  Or do we just have a bad card?


HI.

	Well, the pin assignments are not changed.  The first thing
	to check is what serial port(s) is the serial board configured
	for? On a PS/2, the serial ports are configured using the
	reference disk that came with the machine.  Note: If you have
	a PS/2 50 and the Dual async serial board you have 3 serial
	ports.  The one on the mother board (25 pin) and 2 on the
	async board (both 9 pin).  These ports can be configured
	as SERIAL_1 to SERIAL_8 (yes, 8 serial ports even though
	DOS only supports 4), in any arbitary order. .ie. the port
	on the mother board could be SERIAL_8, not SERIAL_1 as
	you would hope.  Also note that SERIAL_1 uses hardware
	interrupt level 4, and ALL OTHER SERIAL LINES SHARE
	(yes share) interrupt level 3.  This may not be compatible
	with your software.

	If the above doesn't solve your problem then you may
	have a bad board.

	GOOD LUCK.


Nick Mason/ms272G/John Fluke Mfg Co/Box C9090/Everett WA 98206 USA
   mason@tc.fluke.COM
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