x86 ISA
Developer	Intel AMD
Dev model	Proprietary
Design	Von Neumann
Data word size	8 bit 1 octets 2 nibbles , 16 bit 2 octets 4 nibbles , 32 bit 4 octets 8 nibbles , 64 bit 8 octets 16 nibbles
Instruction word size	Variable "Variable" is not a number.
Introduction	1978
Format	Register-Memory
Endianness	Little-endian
ISAs • By Company • By Inst • By Data

x86 is a family of little-endian instruction set architectures and extensions. As its namesake indicates, the x86 ISA offers binary compatibility all the way from the original 8086 to modern microarchitectures as well as source code compatibility since the 8080. The architecture is widely used in the desktop and server markets by a number of companies including Intel, AMD, VIA, DM&P, and RDC.

Generally speaking, the term 'x86' encompasses the original x86-16, x86-32 (IA-32), x86-64 (AMD64), and the various extensions such as MMX, 3DNOW!, and SSE.

History

Main article: History of x86

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Overview

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Registers

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Operation Modes

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Instruction Set

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Syntaxes

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Interrupts

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Extensions

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Implementations

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See also

• ARM

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