Syslinux - Mar 2004 - Isolinux - Memdisk problems - divide by zero after booting

I'm trying to switch from a standard floppy emulation
rescue disk (PQ-Magic & Ghost) to a no emulation
large floppy using isolinux & memdisk. I finally
got the CD booting on two systems (see below)
but on a third system I get a divide by zero message
and/or other error from DOS, which is starting
to boot correctly. It appears to happen during
loading the drivers in config.sys. It is an
AS-Rock K7VT2 motherboard with originally a
slightly outdated AMI BIOS (09/24/2002)
62-P100-001368-00101111-04201-VIA_K7-K7VT2100
but the same thing happens with the current BIOS
62-P130-001368-00101111-04201-VIA_K7-K7VT2130
BTW, this system boots nicely from the 100MB 
IDE-Zip (which is repartitioned to 10MB),
from which I prepared the gzipped image.
The zip is jumpered to floppy mode, i.e.
it ignores the partition table, although
present.

On other systems this does not occur, it works
correctly on a DK440LX with Phoenix BIOS and
and FSC MT8 MB (the latter is a Phoenix Vs. 4.06
Rev. 1.16.1107).

What can I do to trace down the problem?
Is there a more verbose memdisk kernel?

regards & thanks in advance for any help
--
	Bernhard Treutwein, IuK, Ref. III A 3
	Bernhard.Treutwein(at)verwaltung uni-muenchen de