1989. Intel released the 80486 microprocessor and the i860 RISC/coprocessor chip, each of which contained more than 1 million transistors. The RISC microprocessor had a 32-bit integer arithmetic and logic unit (the part of the CPU that performs operations such as addition and subtraction), a 64-bit floating-point unit, and a clock rate of 33 MHz.
The control unit ,located within the processor, directs and coordinates most of the operations in the computer. The arithmetic/logic unit is also located within the processor and performs arithmetic, comparison, and other operations.