Raised floors

Jules Richardson wrote: OK... Colossus machines were all wired standalone, with overhead rack runs to nearby power cabinets and between components. The Tunny machines had a common power supply, but were sited such that cabling was run around the machine room walls. Teleprinters I'm told were wired according to GPO convention of the time - i.e. overhead runs. I'm still not sure about the punched card equipment - I'm struggling to think who the best person is to ask about that, though. Anyway, all of this doesn't further the raised floor discussion much, except to say that things could be done without raised floors (and given the way that computing evolved in the UK, if GPO convention was to wire overhead then doubtless this was carried over into a lot of computer installations; the US and other countries may have taken a much different route though, with raised floors adopted much earlier) (which raises an incidental question; were Strowger exchanges in non-UK countries typically wired overhead or below-floor?) cheers Jules