Notebook upgrading CPU MMX Slot 1

A friend just gave me a TwinHead P90 Notebook. It has a Pentium 300 MMX processor with a front side bus speed of 66MHz. I was wondering what kind of a CPU I might be able to upgrade this to without spending too much money. Also increasing the bus speed to 100MHz would be nice if I could. It uses Slot 1, and the socket designation is IMM (MMC1); I don’t know what the socket designation means. Thanks