2 Oct
2020
2 Oct
'20
6:11 a.m.
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of K. Krause via
cctalk
Sent: 02 October 2020 08:54
To: General Discussion: On-Topic Posts <cctech at classiccmp.org>
Subject: Re: Zuse Z4 - Oldest Surviving Computer in the World - Lost in the
archives
On 01.10.20 23:38, Eric Smith via cctalk wrote:It is going to need a lot of
contact cleaning.
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
Schaltgliedlogik", "abstract gating logic", because this logic could be
applied to
both, the full mecanical Z1 and the later relais machines.
I found this carry logic built with transistors in a book from the early 1960.
The author named it: killburn adder. It uses a chain of single transistors.
That would be Tom Kilburn from Manchester who worked on many computers there.
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?
You can find a demonstration of the Zuse-adder on:
http://computermuseum.informatik.uni-stuttgart.de/virtuell/z1_adder.mp4
(sorry, it's in german only :-( )
Klemens
Dave