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An electronic prototyping board with strips onto which are soldered a collection of diodes (and spaces) stood up to thick wires going across the top; a set of rainbow ribbon cable connects onwards. It's very home made.

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An electronic prototyping board with strips onto which are soldered a collection of diodes (and spaces) stood up to thick wires going across the top; a set of rainbow ribbon cable connects onwards. It's very home made.
https://cdn.mastodon.org.uk/media_attachments/files/113/464/745/618/718/263/original/1527fdcf98aa6020.jpeg

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penguin42 (penguin42@mastodon.org.uk)'s status on Tuesday, 12-Nov-2024 00:06:18 JST penguin42

A while ago, I think it was @mos_8502 that mentioned diode matrixes as old ROMs, I think with a picture of an old computer board.
The thing with Diode matrixes is you could make them yourself - here's one my dad made probably in the late 70's, holding morse code for his callsign and common phrases (probably a CQ etc) - I've not decoded it yet.
#retrocomputing #hamradio

In conversation about 14 days ago from mastodon.org.uk permalink