I've exprimented with a rather simple microprogam state machine where there is no ALU or other logic. Just one huge eprom with all the possible results of two factors. The machine reduced to a fetch instruction, lookup results (the factors are addresses to the eprom), return result. At a 50,000ft view its a standard Von looking thing, close in there is none of the usual hardware. So I would be suggesting that which externally conventional in programming the implmentation could really be off the current map. Allison