Our school had this RML-380Z which was a hulking CPM thing with elephant disks. It must have cost a fortune and nobody knew how to use it or was very interested. One day someone turned up with a ZX81 and 3D monster maze and everyone was crowded around to see it.
It's amazing now to think how this primitive, crappy little computer sparked more interest than a "proper computer". I got a ZX Spectrum soon after and was hooked.
The school didn't learn though. They more some RML480s which were sans floppy and booted off the network somehow. Nobody was interested in them. They switched to BBC micros soon after which at least had some games, colour, sound and enough other things for kids to find them interesting. I still preferred my Spectrum though.