[GreenKeys] Relay Computer on CraigsList (Crosspost from CCTech)

[Peter Gottlieb]

Although nothing like that, one of my middle school science fair projects was a 
32 bit binary adder-subtractor built out of relays.  I don't remember exactly 
but this was somewhere around 1970-71.  I used a massive amount of 120 volt DC 
coil 4PDT rectangular metal can relays, panel mount toggle switches, and neon 
lamps.  I remember my biggest problem at the time was the 120 volt DC power 
supply but I did eventually get the whole thing to work right.

I got second place, first place went to a kid whose parents donated a mint to 
build a new gym.


On 4/1/2011 3:16 AM, Christian Gauger-Cosgrove wrote:
> Hey everyone; being there was a bit of discussion on relay computers
> (and building a relay computer), I thought it might be interesting to
> post this here.
>
> Someone in Parma, Ohio is selling a 1964 vintage, custom made, relay
> computer built by Bell Labs engineers.
>
> Asking price is $100.00; was once part of a CNC machine.
>
> The CL page is here: http://cleveland.craigslist.org/sys/2289527889.html
>
>
> Cheers everyone!
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