The
Intel 80386 ("
eight-oh-three-eighty-six"), also known as
i386 or just
386, is a 32-bit
microprocessor introduced in 1985. The first versions had 275,000 transistors and were the
CPU of many
workstations and high-end
personal computers of the time. As the original implementation of the
32-bit extension of the
80286 architecture, the 80386 instruction set, programming model, and binary encodings are still the
common denominator for all 32-bit
x86 processors, which is termed the
i386-architecture,
x86, or
IA-32, depending on context.