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I can't get youtube (at work)

Is this the event in Oxford, with a bunch of speccy 48s hooked up with one of these? http://spectrum.alioth.net/doc/index.php/Spectranet

(I think there would have been a Raspberry PI in the mix somewhere as a network metronome)

Indeed it is, and using the Spectranet board. The Pi simply provided synchronisation, each Spectrum had the whole piece in memory as BASIC code.

We had a bit of a discussion about how it might have been done back in the day using 1 bit input ports and a Spectrum doling out sync pulses.

Edit: Though the Spectranet's auto-loading of the code made things far easier than it would have been with loading 12 Spectrums from tape!

Fabulous, I've been waiting for the video since I saw the photos on facebook :)