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[Qemu-devel] QEMU floppy problems (was: ecos and qemu)

From: Johannes Martin
Subject: [Qemu-devel] QEMU floppy problems (was: ecos and qemu)
Date: Fri, 23 Jul 2004 17:08:45 +0200 (CEST)

On Fri, 23 Jul 2004, Ben Pfaff wrote:
> > For a while I thought it wasn't since not all apps worked. I think now
> > it is a problem with the floppy code(either in qemu or in ecos). The
> > apps are built as bootable floppy images and some of them were lacking
> > sectors so parts of the image were NULLs leading to crashes. If I turn
> > those same floppy images to bootable iso-s using mkisofs and run
> > qemu-cdrom on them they work all the time.
> That's very interesting.  At least part of the problem I've had with
> Windows NT 3.51 appears to be floppy-related.  I'll have to see if I can
> try anything similar.

I've got floppy problems in OS/2 and Win98 as well. Booting the
installation floppies and a win98 boot floppy both works fine, but from a
fully installed version of OS/2 and Win98 installed on disk I cannot
access the floppies at all.

The difference: booting probably goes through int13 on all systems, i.e.
through the bios, but once OS/2 and Win98 later access floppies by
programm the fdc directly. So maybe there's a bug in that part of the


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