Which 1978 Intel microprocessor introduced the x86 architecture?

Which 1978 Intel microprocessor introduced the x86 architecture? The Intel 8086. Introduced in 1978, it established the instruction-set lineage that later became known as x86.

The 8086 was Intel’s 16-bit successor to the company’s earlier 8-bit processors, including the 8080. It used a 16-bit data path and could address 1 MB of memory through 20-bit addressing and segmented memory. Those design choices gave it substantially more capability than Intel’s earlier 8-bit families while preserving a foundation that could be extended by later processors.

The term x86 was coined retrospectively from the model numbers of successors ending in “86.” The 80186, 80286, 80386 and 80486 extended the family, while the 80386 later brought the architecture into the 32-bit era. The 8088, introduced in 1979, was a closely related variant with an 8-bit external data bus.

The 8086 itself was not the processor inside the original IBM PC; IBM used the bus-compatible 8088 in 1981. That distinction often causes confusion, but both chips belong to the same early x86 lineage. The family ultimately expanded through 32-bit IA-32 and 64-bit x86-64 implementations.