Info on UM8397 floppy disk IC?

Hi, has anyone got any data on the UM8297 floppy disk controller IC? I found one on a tiny ISA board in the loft the other day (labelled "FDC-III"). I was hoping it might provide a little more flexibility in reading non-PC floppies on a PC machine (specifically Acorn BBC - none of the spare PC motherboards I have kicking around happen to have floppy controller ICs that do this) Using the ISA board in a PC with the on-board floppy disk controller disabled, the drives seek on startup as expected but I can't get any data from floppies put into them (known-good MSDOS-format disks, known-good drives, and a known-good data cable). Tried using both DOS and Linux. A few thoughts: 1) The controller IC might be broken; I don't know its history. The fact that it's doing a seek on startup makes me think it's at least semi-alive though. 2) The motherboard fdc IC might somehow get in the way for data transfers, despite being disabled in the BIOS (bad design if so!) 3) The chip might need some specific setup from DOS before it'll work correctly. 4) The chip might be expecting a specific floppy drive type or types to be attached, or set up in a certain way. I've only tried known-good high density 5.25" and 3.5" drives so far. 5) Maybe the IC doesn't emulate any kind of standard PC floppy controller chip, and needs a whole complex driver to function. Yuck. I'm hoping on 3) or 4) at the moment, with 3) being more useful to me! If I fit a 5.25" drive say, and set it up as a 3.5" drive in the motherboard BIOS, then the system halts on startup with a floppy disk failure as expected - so it does look like the BIOS is trying to talk to the ISA board with the IC on it and knows that it's there. There's very little on the ISA board itself - the IC itself, a pair of 7406 chips, and some clock circuitry. No configuration on the board whatsoever. As I say, maybe the board isn't strictly DOS-compatible without a driver, or designed to do some oddball task. cheers Jules (waiting for hangover to go and eyes to start working correctly...)