Intel 386 DX

Historia

The 386 was the successor to the 80286 processor and the first Intel processor with 32-bit data and address busses. It can address four gigabytes (2^32 bytes) of memory - however, 16 megabytes is a typical maximum in IBM PCs. The 386 allows multiple application programs to run at the same time (when running under 386-specific operating systems) using protected mode. The first IBM compatible to use the 386 was the Compaq 386, before IBM used it in high-end models of their PS/2 series. With the 386, Intel introduced the DX - SX naming system. DX stands for Double-word eXternal, SX for Single-word eXternal. The SX versions therefore are lower-speed version of the 386(DX). They use a 16-bit data bus instead of a 32-bit data bus.