Z2 (computer)

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The Z2 was a mechanical and relay computer created by Konrad Zuse in 1939. It was an improvement on the Z1, using the same mechanical memory but replacing the arithmetic and control logic with electrical relay circuits. Photographs and plans for the Z2 were destroyed by the Allied bombing during World War II.[1] In contrast to the Z1, the Z2 used 16-bit fixed-point arithmetic instead of 22-bit floating point.


Frequency Ca. 5 Hertz
Arithmetic Unit Fixed point arithmetic unit with 16 bit word length
Average calculation Speed 0.8 sec for addition operation
Number of Relays 600
Memory 64 words (same as Z1)
Power Consumption 1000 watts
Weight 300 kg (660 lb)


See also[edit]


  1. ^ Zuse, Horst. "Part 4: Konrad Zuse's Z1 and Z3 Computers". The Life and Work of Konrad Zuse. EPE Online. Archived from the original on 2008-06-01. Retrieved 2008-06-17. 
  2. ^ "Z2 Data Sheet". Retrieved 2015-02-09. 

External links[edit]