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Jun 22, 2026 · Industry Insights
Why Did 90s PC Cases Always Feature a Turbo Button?
The article explains that early IBM PCs used a fixed 4.77 MHz CPU clock for timing, prompting manufacturers of faster 80s and 90s clones to add a front‑panel Turbo button that could switch the processor between high speed and the original rate, ensuring compatibility with games and software that relied on the original timing.
CPU clockIBM PCPC hardware
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