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. Dwight
________________________________ From: cctech <cctech-boun...@classiccmp.org> on behalf of osi.superboard via cctech <cct...@classiccmp.org> Sent: Thursday, October 1, 2020 6:07 AM To: cct...@classiccmp.org <cct...@classiccmp.org> Subject: Zuse Z4 - Oldest Surviving Computer in the World - Lost in the archives A few days ago, it was published on BLOC@CACM that a lost user manual for the Z4 and notes on flutter calculations was found in the ETH Zürich archives. See: https://cacm.acm.org/blogs/blog-cacm/247521-discovery-user-manual-of-the-oldest-surviving-computer-in-the-world/fulltext Zuse Z4, a relay computer of 1945, however, due to lack of documentation, its functionality was largely unknown. Now a manual for the machine has appeared at ETH Zurich, that was buried in the archives. And this in the digital age ... Thomas
