Hello All: Does any one have a schematic for a ROM less Z80 microprocessor trainer. Would like to build a bare bones trainer that does not have a monitor program in ROM . Would like to hand enter machine language commands. The Art of Electronics student manual 1st edition had one, but I can't find the first edition anywhere. The Circuit Cellar Build your own Z80 had one also but the out of print editions are expendsive. Thanks for your Help.