Check Mick and Brick on Bit slice design and implmentation of an 8080 in bitslice. Actually 8080 is easier if you are not trying to create a peice of hardware that results in a 40pin plug to replace an 8080. By that I mean something that would run 8080 programs but not electrically compatable and may be slightly different timing. There was also a 16bit CPU in Byte, plus there were articles on TOY (minimalst machine) and further articles on microprogrammed vs hard wired logic. The 16 bitter was EGO in the September 1985 issue (part 1, Part2 is October '85). So there is another fairly simple machine of very buildable proportions with a better than most instruction set. Allison