On 11/2/2005 at 2:55 PM Allison wrote: Hmmm, my recollection is of an 8-bit machine pre-1985. I recall that it was benchmarked against a 4MHz Z80A. My first attempt at building a semiconductor computer was back in the late 1960's. Using RTL (no DIPs, just TO-86 flat packs), I managed to get a 12-bit ALU and accumulator done before I lost interest. I recall using a lot of diodes to save on logic costs. I think I still have a couple of the Fairchild 8-bit (1x8) addressable latch in a TO-100 package that were going to form the basis of my register file. I believe it required a 7v clock. Anyone remember the Moto mw RTL "experimenter's pack" that was sold back then? That's when electronics companies still thought that appealing to the hobbyist was worthwhile... Cheers, Chuck