Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!amdcad!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!husc6!m2c!jjmhome!cloud9!dts
From: dts@cloud9.UUCP (Daniel Senie)
Newsgroups: comp.sys.ibm.pc
Subject: Re: serial port on PS/2
Message-ID: <1695@cloud9.UUCP>
Date: 13 Sep 88 02:50:27 GMT
References: <1410@bingvaxu.cc.binghamton.edu>
Organization: Stratus Computer, Inc., Marlboro, MA
Lines: 32

In article <1410@bingvaxu.cc.binghamton.edu>, sullivan@marge.math.binghamton.edu (fred sullivan) writes:
> Rather than giving our department some money which we could spend
> sensibly, our dean recently bought us a PS/2 model 50 with an
> extra serial board (which has 2 ports - both with db9 connectors).
> 
> 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?
> 

There are two possibilities: 1. The PS/2 Model 50Z is really screwed up
when it comes to serial ports. It seems some brilliant person at IBM
decided to change where all of the I/O port mappings are or some such.

The other possibility is that you have just a regular PS/2 Mod. 50. The
Dual Async adapter from IBM for the MicroChannel is kinda wierd. Make sure
you get the right port for COM2. COM3 is virtually unusable, as the I/O
address (as shown in the BIOS in-memory tables) is 3220 Hex. Most comm
software does not understand this. I have not gone hunting to see what
interrupt they wired it to yet.

Buying from IBM seems to be getting riskier by the day...

Good Luck.


-- 
Daniel Senie               UUCP: harvard!ulowell!cloud9!dts 
Stratus Computer, Inc.     ARPA: anvil!cloud9!dts@harvard.harvard.edu
55 Fairbanks Blvd.         CSRV: 74176,1347
Marlboro, MA 01752	   TEL.: 508 - 460 - 2686