Z1

Originally named the V1, the Z1 began development in 1936 by Germany's Konrad Zuse in his parents living room and today is considered the first electro-mechanical binary programmable computer. The Z1 had 64-word memory (each word contained 22 bits) and a clock speed of 1 Hz. To program the Z1 required that the user insert punch tape into a punch tape reader and all output was also generated through punch tape.

Also see: Computer history