A sneak preview of a complete MCS-4 computer, built from discrete transistors, has been shown off to mark the recent Intel 4004 anniversary. In the picture below, you can see the calculator interface flanked by seven hand-wired ‘chips’ that implement the entire original Busicom 141-PF calculator logic in hardware. That means those framed PCBs you see are supersized remakes of the Intel 4004 CPU (the largest at center), plus 4001 ROM, 4002 RAM modules, and 4003 shift registers.
