this post was submitted on 21 May 2025
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The ancient systems I knew didn't have a power button, and instead power was controlled by a physical switch on the high voltage side of the power supply.
The key actually locked out the keyboard, which was possible since the keyboard had a dedicated connector. So you could still turn the computer on, but you really couldn't use it.
I suppose locking out the power button is a suitable replacement for a modern case.
The first computer I owned was scrap from a hospital and had a keyed power button