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Of course! The crazy thing is that you could do it while the computer was running and it was mostly fine: DOS and many DOS games would just happily keep working, just at slighly different speeds. But then it wasn't uncommon for the PC to just freeze and then it needed a reboot.

But the best feature, to me, was those PC with a turbo button that also had a seven-segment display showing the current speed. This was looking really cool.

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We added a variable frequency control to an IBM/AT and used it to adjust the CPU clock up to the point just below where the system would crash. Default was 6 MHz but we could push it up to around 10 MHz before it started crashing. That seemed amazingly fast at the time.

I distinctly rememver taking one apart and being very disappointed: the segment display was completely fake and showed 2 predefined numbers, not correlated to the CPU frequency at all.

Unless you set them correctly to actual CPU frequencies, in which case they correlated perfectly.

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