<I've also been thinking about "cloning" a kinda 32bit clone of the <famous <TMS 9900. This chip had it's registers in memory and if such a design <would incorporate cache memory the results would still be respectable. <Especially if it could be done with programmable-asic technology. Doable and even without cache it can be fast as the moderm memory (under 10ns parts). Granted it doesnt take much to beat the old 9900 that clocked in at 4mhz for the "fast" parts and used 400ns memory. My favorite would be to do a stretch PDP-8, simple and could be very fast using FPGAs. Allison