Well actually the latest drivers for the catweasel doesn´t support the pc drive function if you are using a single drive. You could attach a second pc drive directly to the catweasel for amiga disks only, and the other for pc drives directly to the mainboard fdd controller. I have only one floppy and i can read and write amiga disks without problem, but pc disks cannot be accessed while the catweasel driver is loaded, but as i didn´t use much pc disks, isn´t a problem for me.
And you said you have a pentium 3 Athlon?

If it´s a pentium couldn´t be a athlon since they are from different brands, Intel and AMD respectively.
Hope this helps you. If you have more questions about the catweasel board i will help you, mine is working harder regenerating my old time favourites 500´s games :lol:
See ya!!!!!