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It features scaled indexing and 64-bit barrel shifter. The all new virtual 8086 mode (or VM86) made it possible to run one or more real mode programs in a protected environment, although some programs were not compatible. With the addition of segmented addressing system, it can expand up to 64 terabytes of virtual memory. The protected mode, which debuted in the 286, was extended to allow the 386 to address up to 4 GB of memory. The 80386 featured three operating modes: real mode, protected mode and virtual mode.

It also offered support for register debugging.

This paging translation unit made it much easier to implement operating systems that used virtual memory. The 80386 added a three-stage instruction pipeline which it brings up to total of 6-stage instruction pipeline, extended the architecture from 16-bits to 32-bits, and added an on-chip memory management unit. The predecessor of the 80386 was the Intel 80286, a 16-bit processor with a segment-based memory management and protection system. The processor was a significant evolution in the x86 architecture, and extended a long line of processors that stretched back to the Intel 8008. Д«lock diagram of the i386 microarchitecture i386 registers Linux continued to support i386 processors until Decemwhen the kernel cut 386-specific instructions in version 3.8. Some mobile phones also used (later fully static CMOS variants of) the i386 processor, such as BlackBerry 950 and Nokia 9000 Communicator. Such systems using an i386 or one of many derivatives are common in aerospace technology and electronic musical instruments, among others. Although it had long been obsolete as a personal computer CPU, Intel and others had continued making the chip for embedded systems. In May 2006, Intel announced that i386 production would stop at the end of September 2007.

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The first personal computer to make use of the 80386 was designed and manufactured by Compaq and marked the first time a fundamental component in the IBM PC compatible de facto standard was updated by a company other than IBM. Mainboards for 80386-based computer systems were cumbersome and expensive at first, but manufacturing was justified upon the 80386's mainstream adoption.

Manufacturing of the chips in significant quantities commenced in June 1986, along with the first plug-in device that allowed existing 80286-based computers to be upgraded to the 386, the Translator 386 by American Computer and Peripheral.

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The 80386 was introduced as pre-production samples for software development workstations in October 1985. The tape-out of the 80386 development was finalized on July 1985. Дevelopment of i386 technology began in 1982 under the internal name of P3. A 33В MHz 80386 was reportedly measured to operate at about 11.4 MIPS. (Following the same tradition, modern 64-bit x86 processors are able to run most programs written for older x86 CPUs, all the way back to the original 16-bit 8086 of 1978.) Over the years, successively newer implementations of the same architecture have become several hundreds of times faster than the original 80386 (and thousands of times faster than the 8086).

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The 32-bit i386 can correctly execute most code intended for the earlier 16-bit processors such as 806 that were ubiquitous in early PCs. As the original implementation of the 32-bit extension of the 80286 architecture, the i386 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. The first versions had 275,000 transistors and were the CPU of many workstations and high-end personal computers of the time.