On 12/31/2005 at 1:19 PM e.stiebler wrote: >What about very simple 16 bit risc ? >4 bit opcode, 4 bit destination , 4 bit source 1, 4 bit source 2 ? You know, there is a small community of folks using FPGAs to implement all sorts of interesting architectures, including the one you've just described. Perhaps it's worth a look... Cheers, Chuck