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The 8086 [3] (also called iAPX 86) [4] is a 16-bit microprocessor chip designed by Intel between early 1976 and June 8, 1978, when it was released. The Intel 8088, released July 1, 1979, [5] is a slightly modified chip with an external 8-bit data bus (allowing the use of cheaper and fewer supporting ICs), [note 1] and is notable as the processor used in the original IBM PC design.
Westmere: 32 nm shrink of the Nehalem microarchitecture with several new features. Sandy Bridge 32 nm microarchitecture, released January 9, 2011. Formerly called Gesher but renamed in 2007. [2] First x86 to introduce 256 bit AVX instruction set and implementation of YMM registers.
An 8086 system, including coprocessors such as 8087 and 8089, and simpler Intel-specific system chips, [d] was thereby described as an iAPX 86 system. [7] [e] There were also terms iRMX (for operating systems), iSBC (for single-board computers), and iSBX (for multimodule boards based on the 8086-architecture), all together under the heading ...
Below is the full 8086/8088 instruction set of Intel (81 instructions total). [2] These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts.
Since a primary design specification of x86 microprocessors is that they are fully backward compatible with software written for all x86 chips before them, the 286 chip was made to start in 'real mode' – that is, in a mode which turned off the new memory protection features, so that it could run operating systems written for the 8086 and the ...
Main menu. Main menu. move to sidebar hide. ... Intel 8086; Intel 8087; Intel 8088; Intel 8089; ... Multi-channel memory architecture; N. Nehalem (microarchitecture)
Four registers are used to refer to four segments on the 16-bit x86 segmented memory architecture. DS (data segment), CS (code segment), SS (stack segment), and ES (extra segment). Another 16-bit register can act as an offset into a given segment, and so a logical address on this platform is written segment:offset, typically in hexadecimal ...
The 16-bit 8086 architecture of the new machines enabled them to break the 64 KB RAM limit of CP/M and address up to a megabyte of RAM. CP/M's fortunes weren't helped by the user-oriented marketing of Microsoft and IBM and the lack of same by Digital Research.