Zuse Z4 - Oldest Surviving Computer in the World - Lost in the archives
Krause at informatik.uni-stuttgart.de
Fri Oct 2 02:53:53 CDT 2020
On 01.10.20 23:38, Eric Smith via cctalk wrote:It is going to need a lot
of contact cleaning.
>> The one thing I like is the carry design the Zuse used. Really fast for
>> relays but not of much use for solid state.
> Where is that circuit described?
The circuit is described in Konrad Zuses life memories. There is an english
translation available from the Springer publishing house.
Zuse used it's own logic symbols, which he named "abstrakte
"abstract gating logic", because this logic could be applied to both,
mecanical Z1 and the later relais machines.
I found this carry logic built with transistors in a book from the early
The author named it: killburn adder. It uses a chain of single transistors.
You can find a demonstration of the Zuse-adder on:
(sorry, it's in german only :-( )
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