Indeed, it still is. But there are many choices and in the end it would depend if you wish to use boards native to that bus. If you not using board native to the bus then there is no compelling reason other than convenience in seeking protocards and connectors. In the past I've used PC XT (ISA-8) bus as it's 8bit data/20bit address and enough pins for anything. the convenice was there are/were bare busses (or you can cut up an old mainboard) and protoboards were cheap and fairly large. Allison