Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!uc!uf!jeff
From: jeff@uf.msc.umn.edu (Jeff Turner)
Newsgroups: comp.sys.ibm.pc
Subject: "Non-DOS Disk" error message
Keywords: Non-DOS Disk error
Message-ID: <960@uc.msc.umn.edu>
Date: 21 Dec 89 18:40:36 GMT
Sender: news@uc.msc.umn.edu
Reply-To: jeff@msc.umn.edu (Jeff Turner)
Organization: Minnesota Supercomputer Center, Minneapolis, MN
Lines: 24
References:

I recently purchased a secondary floppy controller for my Zenith 241 (AT).

My problem is that when I try and use it DOS complains that the previously 
formatted floppy I am using is a Non-DOS Diskette.  This even happens when I
format a new disk:  DOS formats the whole disk and then gives me the message
as it is finishing up.  This newly formatted disk works fine when accessed via
the primary controller.

I remember some discussion about this a few months ago, unfortunately I did
not save any of the articles.  I believe it has something to do with length
of magic number and how different types of BIOS look at it differently.


I am looking for the specifics of where and what this magic number is (and
what it should be) so that I can patch the firmware and then replace it with
a newly burned controller eprom.

Thanks much.


---
Jeff Turner			Minnesota Supercomputer Center, Inc.
(612) 626-0544			1200 Washington Avenue South
jeff@msc.umn.edu		Minneapolis, Minnesota  55415