Some homebrew CPU from early 70s, from Japan

Over on the anycpu forums, @B.B posted some findings of some interesting CPUs made from TTL chips:

Lots of info at the thread:
Atom-8 and Easy-4, published in Japanese magazines.

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@B.B found another case, a series of machines started in 1978 and finished in 2018…
The RETROF series of homemade TTL computer.