Konrad Zuse had bad luck with his original Z1. The Z1 did contain all components
of a modern day computer, however, the Z1 was not reliable. Its mechanical construction
was too complex and error prone. Therefore, Konrad Zuse decided to construct the
Z2. He wanted to find out whether the use of relays yielded better results.
A Numeric unit (no picture available) with 600 relays did work well. The Z2 was complete
The airthmetic unit consisted of a word length of 16 bit and fixed point arithmetic
Konrad Zuse now decided to build the Z3, a computer completely built with relays.
It later became to be known as the first fully functional programmable computer.