A20 line and MS-DOS

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Difference between A20 line and MS-DOS

A20 line vs. MS-DOS

The A20, or addressing line 20, is one of the electrical lines that make up the system bus of an x86-based computer system. MS-DOS (acronym for Microsoft Disk Operating System) is an operating system for x86-based personal computers mostly developed by Microsoft.

Addison-Wesley

Addison-Wesley is a publisher of textbooks and computer literature.

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Application programming interface

In computer programming, an application programming interface (API) is a set of subroutine definitions, protocols, and tools for building software.

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CONFIG.SYS

CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems.

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CP/M

CP/M, originally standing for Control Program/Monitor and later Control Program for Microcomputers, is a mass-market operating system created for Intel 8080/85-based microcomputers by Gary Kildall of Digital Research, Inc.

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DOS

DOS is a family of disk operating systems.

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High memory area

In DOS memory management, the high memory area (HMA) is the RAM area consisting of the first 65520 bytes above the one megabyte in an IBM AT or compatible computer.

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HIMEM.SYS

HIMEM.SYS is a DOS device driver which allows DOS programs to store data in extended memory via the Extended Memory Specification (XMS).

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IBM Personal Computer

The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform.

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Intel 80286

The Intel 80286 (also marketed as the iAPX 286 and often called Intel 286) is a 16-bit microprocessor that was introduced on 1 February 1982.

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Intel 80386

The Intel 80386, also known as i386 or just 386, is a 32-bit microprocessor introduced in 1985.

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Intel 8086

The 8086 (also called iAPX 86) is a 16-bit microprocessor chip designed by Intel between early 1976 and mid-1978, when it was released.

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Intel 8088

The Intel 8088 ("eighty-eighty-eight", also called iAPX 88) microprocessor is a variant of the Intel 8086.

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MS-DOS

MS-DOS (acronym for Microsoft Disk Operating System) is an operating system for x86-based personal computers mostly developed by Microsoft.

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Operating system

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.

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Program Segment Prefix

The Program Segment Prefix (PSP) is a data structure used in DOS systems to store the state of a program.

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X86

x86 is a family of backward-compatible instruction set architectures based on the Intel 8086 CPU and its Intel 8088 variant.

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