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There are several boxes in the chain. PDP-11 to IMP adapter connection was a ribbon cable, and IMP adapter to IMP was bit-serial but multi-conductor. Everythin

There are several boxes in the chain. PDP-11 to IMP adapter connection was a ribbon cable, and IMP adapter to IMP was bit-serial but multi-conductor. Everything required a lot of boxes back then. An IMP adapter was about 4U of rack space.

dfox 2y ago
Bit-serial but multi-conductor cable. The 6 pairs, ground and if I count correctly two single-ended status lines make more sense than 30-pair Cisco serial cables or 34-pair HSSI of the 90's…