While Turing’s computer was an abstract concept, it a German engineer named Konrad Zuse who would go on to build the world’s first programmable computer. His first attempt at developing an electronic computer, the Z1, was a binary-driven calculator that read instructions from punched 35 millimeter film. The problem was the technology was unreliable, so he followed it up with the Z2, a similar device that used electromechanical relay circuits.