Adam asks: I wouldn't bother. They don't work reliably. There are two types: 1) Unbuffered. These don't work because well-designed ISA cards barely have enough drive for 8 slots, and cheap crap (including some common brand-name stuff) only has enough drive for 2-3 slots. Even with the well-design stuff, once you figure in the added capcitance of a cable and another backplane, it won't work reliably even if you're just trying to expand a modern motherboard with only 1-3 ISA slots. 2) Buffered. These have all sorts of limitations regarding bus mastering cards. Even if you don't need bus mastering, they introduce enough delay into some of the critical ISA signals that many cards won't work properly. The signals that a card has to assert to indicate to the motherboard whether it is 8 or 16 bit, and whether it needs wait states, are very time critical. It's been over five years since I looked into these, and I doubt that there are any better solutions now than there were back then. If there were any good solutions, I guarantee that they would cost a lot more than $500. The fundamental problem is that ISA is a crappy excuse for a bus. It's very poorly designed; IBM just brought out the processor signals to the connector in the PC and XT, and kludged more crap on for the AT. On the other hand, PCI is actually a pretty well-designed bus, and it is quite possible to build an expansion box for it. Bit 3 (apparently now a subsidiary of SBS) makes some nice boxes. But I think they sell for around $1000. What exactly do you need to interface to the ISA bus?