This sounds like ancient zeroeth-generation PCs that used things like the S-100 bus: https://en.wikipedia.org/wiki/S-100_bus https://en.wikipedia.org/wiki/S-10

This sounds like ancient zeroeth-generation PCs that used things like the S-100 bus: https://en.wikipedia.org/wiki/S-100_bus https://en.wikipedia.org/wiki/S-100_bus This was also a single bus that almost everything plugged into.