an  Intel 80486DX2 microprocessor  (actual size: 12×6.75 mm) in its packaging. Konrad Zuse 's  electromechanical  "Z machines". The  Z3  (1941) was the first working machine featuring  binary  arithmetic, including floating point arithmetic and a measure of programmability. In 1998 the Z3 was proved to be  Turing complete , therefore being the world's