CPU upgrade

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Upgrading your Pentium II to a Pentium III

Thinkpads dating from around 1999-2000 have MMC2 CPU daughter boards, hence, can be upgraded.

The hardware maintenance manual explains in details how to proceed. The only catch is that the BIOS cannot activate the L2 cache of a Pentium III, which is solved by using a kernel module.

The good news is that the memory bus speed goes from 66MHz to 100MHz.

The other bad news is that the bios produces errors of type 127 when booting (press ESC, then F1). Fortunately, modifying one byte in the bios with the integrated bios editor cures definitely the problem (see this post)

Be carefull when choosing the speed of the new MMC2 daughter board, since there might be some problems with voltages/speedstep. 500MHz is a safe choice.

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