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From my experience of trying a history of computers lesson...

I tried showing this old tech programme but they failed to relate to it and got bored really quickly. I think it destroyed my street cred more than anything :).

They did enjoy a clip that showed one of the first home pcs and games consoles, so decided to change my lesson plan. I found a youtube video showing a zx spectrum loading a game. Some jaws dropped and after they begged me to turn off the noise, I let them play some a retro game (type "pacman" into Google).

A classroom display may work well. They can then look and read about it in their own time. In the iMac suite I have a poster showing Macs through the ages. It kept them amused for weeks and they appreciated what they have.