I've just come across this wonderful item about hard-wired programs on a tabulating machine - the IBM 403 Accounting Machine, released in 1948.
It was news to me that the plugboards were removable, so that programs could be retained and reused as required - that picture of shelves of wired plugboards is going to stick in my memory!
Perhaps this could serve as inspiration for programming the simple transistor-based computer I've been mulling over? I'd already thought about doing something similar to store the sequences of notes used for an analogue synthesizer.
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