Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!decwrl!sun!smile!alanf
From: alanf%smile@Sun.COM (Alan Fargusson)
Newsgroups: comp.os.minix
Subject: BIOS disk driver
Message-ID: <79151@sun.uucp>
Date: 29 Nov 88 01:50:22 GMT
Sender: news@sun.uucp
Lines: 11

There is a problem with calling the ROM BIOS when you are using interrupts on
the Z-248.  The problem is that the BIOS switches to an internal stack which
is very small.  If an interrupt occurs during the call to the BIOS it is
likely that this stack will overflow.  There are other potential problems as
well.

I found this problem while debuging an interrupt driven serial port driver for
MS-DOS.  Older versions of the Zenith BIOS seem to work better.
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Alan Fargusson		Sun Microsystems
alanf@sun.com		..!sun!alanf