the original bit x from intel early concept of em t coded name yamhill the register were extending from bit to bit unlike x this design do not come with additional general purpose register r r and lack of bit mmu and address mode support bit address mode with pae for maximum compatibility with legacy application early prescott tejas and timna were the only implement of this isa and later is replaced by em t the above text is copied from user without his or her permission but if he or she requests i would remove from my talk page