> The two problems I ran into were that the ad1848 expected an io range in
> which it was the upper four of eight bytes. For this card, you only get
> the exact 4 bytes needed. So I was going to change the ad1848 code to use
> a subrange which was just its four bytes. That would be the 534/4 range in
> this I/O card.

The PnP version of the Crystal chip (I forget the number) used in some
ThinkPads does the same thing.  The lower 4 ports in the traditional
WSS contain some configuration registers (IRQ, DRQ, etc.) that are
only used on the ISA bus.