My Relay Computer - First Experiment
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Uploaded by nablaman on Jun 27, 2009
I'm working on constructing a computer using relays. This video shows the first three cards in operation. The top card is the adder/incrementer, the second is logical and ALU control, and the bottom one holds 4 x 8-bit registers. Red lights are data bits, blue are control lines. The control lines are driven by a PC through the smaller relays on the small card at the very top.
This first experimental cicuit iteratively increments the value in the "A" register (the row of LEDs at the top-left of lower card). The operation is as follows:
1) Select increment operation of ALU (shown by blue LED on the top card) and select A register as input. A+1 appears on data bus. 2). Store data bus in B register (bottom row of LEDs on bottom card). 3). Load B register onto data bus. 4). Store data bus in A register. 5). Repeat from 1.
Watch the binary value of the bottom LED rows increase by one and enjoy the beautiful sound of the relays clicking! My intention is to extend this into a complete, micro-programmable CPU.
Read more at nablaman.com/relay !
- 156 likes, 2 dislikes
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Uploader Comments (nablaman)
Top Comments
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@yaglourt Zero! (it doesn't have a floating point unit =)
1 year ago 7
All Comments (100)
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Can I buy this? o_O
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Thats an expensive experiment.
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perfect!
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its counting up in binary!
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The computer is playing some robotic music...
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interesting
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the computer is tap dancing ;)
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Nice work! I used to dream of having the money to build something like this when I was a kid -- and this was current technology.
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@nablaman loud and annoying but beautiful ?
i know that ;D
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@bazengao It 's counting.
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what is he doing?
bazengao 6 months ago
@bazengao Zusie is a she! :-) The program shown in the video increments the value of a register again and again.
nablaman 6 months ago 6
@nablaman a she? ok friend if that's what you think so be it.
bazengao 6 months ago
@bazengao Oh come on, I bet you feel the same way about your computer ;-)
nablaman 6 months ago 10
I feel proud of myself for figuring out that it was counting before reading the description. This thing is awesome, you're reenacting computer history.
Sofar2 7 months ago
@Sofar2 Thanks :) Nice to hear that you appreciate the machine's intuitive user interface ;)
nablaman 7 months ago