Ah the good old days. Many years ago I worked on a Power ISA CPU. The advantages were obvious - the ISA is open source (read: long dead and burried, they gave up on making it viable a decade or two ago and dumped it open source), and the ISA is neat- you have a 32bit instruction and you can literally do a case statement of "1100_0000_0000_0000: // do fpadd" whereas IA64 had the crazy variable length instructions and all.
