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Linux drops support for 486 and early Pentium processors - 20 years after Microsoft
I can still remember when the 33MHz 486DX was the fastest chip around.
Moving forward, the minimum supported x86 CPU will now be the original Pentium (P5) or newer, requiring the presence of the Time Stamp Counter (TSC) and the CMPXCHG8B (CX8) instruction. These features are absent in the older 486 and early 586 processors, such as the IDT WinChip and AMD Elan families. Removing support for the 486 and early Pentium CPUs will eliminate only about 14,000 lines of legacy code across roughly 80 files.
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