I remember a rather interesting "application specific" thing that happened with Risc PC's in the UK. Because at that particular point in history Acorn and the RISC-OS ecosystem were having to coexist with the Windows ecosystem, people wanted to run their DOS and Windows applications on their Risc PC's. The 80386 and 80486 were bolted onto daughterboards and sold as special-purpose add-on processors, just to run those applications.