1. A computer system comprising: a data processor unit connected to a main memory; said data processor unit including a memory management unit for controlling the conversion of an address of requested data received from a processor into a physical address of said requested data; and said main memory including apparatus for storing the data being accessed in pages at said physical addresses; a page table accessed by said memory management unit for converting to said page addresses; and a page table walker for proceeding through the entries on said page table.