Ok, I've got a USR plug and play modem. It is an ISA, but it's NOT a winmodem.
I know I had the thing working at one time with Linux, but I re-installed and I forgot. Here's something that I remember doing. I used PNPDUMP > ISAPNP.CONF, then I ran ISAPNP ISAPNP.CONF.
Now it seems that I remember doing something in windows to force some CMOS table to be updated or something. It's using COM3 and is using IRQ 11 in windows. When I run PNPDUMP I think I see something like two devices.
Anyway, if I haven't totally confused everyone, can someone give me some hints, lol?
AMD 450 CPU 64MEG Ram, Asus motherboard, Win98 on one HD, Linux on other HD. Modem is USR 56K PnP (Not winmodem).