Transmited light micrograph of an Intel Pentium microprocessor's clock driver. A 32-bit CPU with: a 64-bit data bus, 3.3 million transistors, 0.6 痠 manufacturing process, and superscalar architecture (two instructions per clock cycle). All steps of the instruction cycles (fetch-decode-execute cycles) and all internal CPU operations are regulated by the clock signals of this clock driver, which oscillates at 100 million cycles per second. The chip was fabricated by photolithography, using several overlapping metalization layers and vertical contacts to interconnect them in a mono-crystal silicon wafer, which serves as the substrate. Field of view size: 546 x 819 痠 (0.022 x 0.032 in)