More relay computers, on video

Hardware
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Continuing the discussion from Technician keeps computer made in 1959 still humming along:

Here’s the modern homebuilt Zusie machine (more in this playlist):

A modern build of a floating point square root calculator

This is a machine I built to calculate square roots. It uses only electromechanical relays like the early computers of the 1930s. There are 480 of them, each with a light that you can watch on the front panel. No micro controllers in sight!

See also Simon Winder’s site:
http://simonwinder.com/projects/relay-calculating-engine/

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DAVIAC homebrew relay computer
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See also the semi-portable room-sized MERCIA Relay Computer by Jeroen Brinkman on the homebrew CPU webring.

And also see also the early work-in-progress relay cpu G6A-RISC by joanlluch over on anycpu.

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I see another hobbyist (Brian, aka Dipdot) is building a relay computer - the latest episode (at present) is the replacement (or supplementation) of a 32k byte RAM chip with an 8x8 capacitor memory:
Goodbye SRAM: Building 1940s Capacitor Memory for My Relay Computer

He also exhibited at VCF Montreal this year: