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. Check out the progress page to see how far I've got.
The summaries also give more detail on the various aspects of the computer: ALU, Control, Enclosure, Registers, UI, Instructions & Assembly Language.
Latest Post - 01 Dec 2025 - 5 min read
Talk about raking over old coals! Well, for those of you who follow my YouTube channel this’ll mostly be old news but here I am, six months after the event, finally updating my blog. There’s new news on what’s next though, so hang in there. For …
16 Mar 2025 - 3 min read
Well, it’s only taken 12 years but my computer has finally reached a major milestone - Turing completeness. The architecture of my computer has, of course, been Turing …
09 Mar 2025 - 5 min read
Controller Design: LOAD, STORE & INCXY Instructions
For a while now my computer has been missing its final three instruction classes … and two of them are ‘up there’ alongside branching in terms of overall …
05 Dec 2022 - 8 min read
Controller Design: MOV8, MOV16 & MISC Instructions
Way back in 2019 I discussed how you can’t ‘half design a PCB’ and that, as a result, my controller cards already have all the required functionality laid …
27 Nov 2022 - 10 min read
Assembling an assembler - token scanning
In the last episode of this mini-series I explained about how an assembler’s job is effectively to convert a program written in a language a human programmer can …
20 Nov 2022 - 4 min read
Well, what a journey that’s been then … I started work on a clock for my relay computer back in May 2020 and today (20th Nov 2022) this post marks the end of it. …
You can also find more information at these sites ...
... and you can program and play with a simulation of my relay computer here ...
