HP LJ4100 mfp - Venix fs?

Hi all. I am tinkering with an HP LaserJet 4100 mfp with the hard drive add-in card . The drive on the card is a standard 40GB laptop IDE drive, but when I connect it to my Windows machine and run a partition program (2 different ones so far - EAZEUS and Partition Manager), they identify it as partition type 0x40 Venix-80286. When I boot with my Knoppix DVD, fdisk agrees, but QTParted doesn't know what to make of it. I'm a bit rusty in Linux. How, if at all, do I mount the disk and read what's on it?

The commands I have tried are:
mount -t xenix /dev/hda1 /hp
REPLY= mount: unknown filesystem type 'xenix'

mount -t coherent /dev/hda1 /hp
REPLY= mount: unknown filesystem type 'coherent'

mount -t sysv /dev/hda1 /hp
REPLY= mount: wrong fs type, bad option, bad superblock on /dev/hda1
missing codepage or other error

TIA
Yappi