HarryPorter, a professor at PortlandStateUniversity, has constructed a simple microprocessor (er... macroprocessor?) out of around 400 relays!

* http://web.cecs.pdx.edu/~harry/Relay/

Of note: WardCunningham wrote a little simulator for it in Perl:

* http://home.c2.com/relay/

''No relation to H''''''arryPottersRelayComputer, which is made out of dragons' teeth.''
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