A blog about a computer made from relays

My journey in constructing an 8 bit relay computer from scratch ... made from of a ton of solder, wires, lights, relays, sweat, tears, swearing and money.


This is my blog covering the design and construction of a computer made from relays. If you're new here then a good place to start is the overview page.

The summaries also give more detail on the various aspects of the computer: ALU, Control, Enclosure, Instructions, Registers & UI

To see how far I've got check out the Progress page.

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Latest Post - 14 May 2022 - 9 min read

Assembling an assembler - overview

To make my relay computer do something interesting (or anything at all) it needs a list of instructions held in memory. Each instruction consists of an 8-bit value called an opcode (portmanteau of operation and code) optionally followed by one or two …

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02 May 2022 - 4 min read


So, is fair to say that things have been a bit quiet around here of late … and if you’ve been following my YouTube channel I do hope you haven’t been holding your breath for …

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01 Feb 2020 - 2 min read

2020 Update

As the clock struck midnight at the very end of 2019 I decided, over a glass of something sparkling, that I’d set myself a challenge to put out a series of six YouTube …