Microprocessor History 4 decades of development and evolution oIntel 4004 (introduced in early 1970s)  4-bit words, 4 KB memory address space  2,000 transistors  Clock speed < 1 MHz oAlpha 21264 (late 90's)  15.2 million transistors  Clock speed near 700 MHz oPentium III (late 90's)  64-bit data with gigabit memories  28 million transistors  Clock speeds up to 1 GHz
{}