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From: bc@njitsc1.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: NMI problems on MS-DOS 3.2?
Message-ID: <123@njitsc1.UUCP>
Date: Tue, 31-Mar-87 09:49:30 EST
Article-I.D.: njitsc1.123
Posted: Tue Mar 31 09:49:30 1987
Date-Received: Thu, 2-Apr-87 01:31:29 EST
Reply-To: bc@njitsc1.UUCP (Bill Cheswick)
Distribution: na
Organization: New Jersey Institute of Technology, Newark NJ
Lines: 16
Keywords: DOS 3.2, interupts
Summary: DOS 3.2 seems to care more about NMIs than DOS 3.1

I recently upgraded from DOS 3.1 to DOS 3.2 on my IBM AT (one of the early ones).
I hav ethe Sigma Designs Color 400 display adaptor (ver 2.28) which uses the
NMI interupt to help process certain CGA emulations.

They included a small program to turn off the interupt processing if it
interfered with other things in the machine.  It didn't need to use this
program until I installed DOS 3.2.

(BTW, it took many hours to find this.  I finally realized it was dying when the
screen filled up and it hung trying to scroll.)

Has anyone else run into similar NMI processing problems/changes with DOS 3.2?

Bill Cheswick                      uucp:   bellcore!argus!njitsc1!bc
New Jersey Inst. of Tech.          ARPA:   argus!njitsc1!bc@flash.bellcore.com
                                   bitnet: bc%argus.uucp at mouton.arpa