The machine has an RLL ~40 meg hard drive; incompatible with modern IDE, and with an odd ISA controller card.
Sounds like a PerStor card. I used to have one of those here (a great way to get more capacity out of the tiny drive sizes back then).
I have here a CS5530 eval board: basically a custom micro-ATX motherboard, with PCI & ISA slots, and lots of other goodies. It boots/runs Win98, Linux, and probably most other OSs. Integrated video, USB, serial, etc.. There's a CPU and a stick of PC100 SDRAM on it.
If you think it will help, then it's yours for the cost of postage.
Cheers