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https://upload.wikimedia.org/wikipedia/commons/c/ca/IBM_360_Bus_Tag_Cables.png
@jonty @cstross I'd suggest IBM bus and tag cables, from their older mainframes: https://upload.wikimedia.org/wikipedia/commons/c/ca/IBM_360_Bus_Tag_Cables.png. Note that the connectors are about 10 cm long — and you needed two to connect to each I/O device…
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