PowerPC 601 Microprocessor

The IBM/Motorola PowerPC 601, designed for personal computers and low-end workstations, was originally released in April 1993 with a clock speed of 50 MHz, a 64-bit external data bus, and a 32-bit address bus. Later versions were manufactured with 60, 66, 80, 100, and 135 MHz clock speeds as the four-layer silicon semiconductor manufacturing technique was refined to the 0.5-micron level.