See also Z1 Z2 Z3 History of computing hardware Reverse Polish notation (RPN) Stack machine References Further reading (178 pages) (1+1+16 pages) External links zuse.de homepage from Horst Zuse (son of Konrad Zuse) with much information about the Zuse computers zuse.de {English} English homepage from Horst Zuse (son of Konrad Zuse) Pictures of the Z4 at the ETH Zürich (with German text) 1940s computers Electro-mechanical computers Mechanical computers Z04 German inventions of the Nazi period Computer-related introductions in 1945 Konrad Zuse Computers designed in Germany Serial computers