Summary: Printer and ALM-1 problem

From: Mike Pearlman (
Date: Sat Dec 29 1990 - 12:55:11 CST

        A printer attached to an ALM-1 port on a Sun 3/160 stopped
working when the OS was upgraded from 3.5 to 4.1.1. It appeared Unix
was having flow control problems.

SOLUTION: (note the patch is for 4.1 not 4.1.1)
        Apply SunOS 4.1 patch, patch id 100137-01. Here is the first part
of the README.
Patch-ID# 100137-01
Synopsis: ALM flow control patch
Date: 09/Aug/90
SunOS release: 4.1
Unbundled Product:
Unbundled Release:
BugId's fixed with this patch: 1044721

Architectures for which this patch is available: sun3

Obsoleted by:

Problem Description:

    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

        John Polstra
        Claude Poissant
        John Lyman

michael pearlman <>

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