building my own relay computer

Bob Rosenbloom bobalan at
Fri Feb 13 19:09:49 CST 2015

On 2/13/2015 2:00 PM, Pontus wrote:
> On 02/13/2015 10:40 PM, Tom Sparks wrote:
>> I've been bouncing around the idea of building my own relay computer
>> * I have mostly inspired by the TIM project[1] and Harry Porter's Relay
>> Computer[2]
>> * I am looking at having a limited number registers like the 6502 or 
>> 6800
>> * the computer is going to be Harvard architecture based
>> I wondering have any of use done anything like this?
>> [1]
>> [2]
> Check out Fredriks "Zusie":
> /

I started one years ago and have been working on it very slowly as a 
background project.
I used small, modern relays as they can be bought in quantity cheaply. I 
paid less than
5 cents each for mine. I've built memory out of the relays and have been 
toying with using
a flip-dot type display board as a visual memory. A kind of mechanical 
graphical display.

Some photos are here:


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I've been practising it for years.
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