SUMMARY: MTI serial board doesn't handle flow control

From: Peter Kaldis (peter@Civil.Concordia.CA)
Date: Fri Jan 31 1992 - 02:43:11 CST


A couple of days ago I posted to this group about a problem with an ALM board:

        I'm having a bit of a problem with an MTI 16 port serial board.
        It is currently attached to a Sun 3/160 running SunOS 4.1.1. It
        seems that none of the ports on the board will support any kind
        of flow control.

Well, it turns out that this is not an uncommon problem with these ALM I boards.
In fact Sun has several patches currently available for this problem. Alot of people
wrote in telling me to try such-and-such a patch. However the one that actually
solved the problem for me was patch ID# 100137-01. Here's the readme; look familiar?

> This patch corrects the behavior described in Sun Bug No.
> 1044721. Systems running SunOS 4.1 with ALM (Systech MTI)
> boards can experience flow control problems on these serial
> ports. The system will not recognize an incoming XON
> character after receiving an XOFF character, which causes
> the port to appear frozen. Typing ^S^Q will reenable
> output.

Thanks to everyone who took the time to drop me a line. I appreciate all your

BTW: pick up the file /communications/ from, tons of useful
info on serial communications with Sun equipment. Thanks dudes!

Peter Kaldis Civil Engineering
Unix Lizard Concordia University
Voice: (514)-848-7819 1455 De Maisonneuve Blvd. W
Fax: (514)-848-2809 Montreal, QC
peter@Civil.Concordia.CA CANADA H3G 1M8

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