Multiuser DOS and Virtual Control Program Interface

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Difference between Multiuser DOS and Virtual Control Program Interface

Multiuser DOS vs. Virtual Control Program Interface

Multiuser DOS is a real-time multi-user multi-tasking operating system for IBM PC-compatible microcomputers. In computing, the Virtual Control Program Interface (VCPI) is a specification published in 1989 by Phar Lap Software that allows a DOS program to run in protected mode, granting access to many features of the processor not available in real mode.

Addison-Wesley

Addison–Wesley is an American publisher of textbooks and computer literature.

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API

An is a way for two or more computer programs or components to communicate with each other.

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BIOS

In computing, BIOS (Basic Input/Output System, also known as the System BIOS, ROM BIOS, BIOS ROM or PC BIOS) is firmware used to provide runtime services for operating systems and programs and to perform hardware initialization during the booting process (power-on startup).

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Digital Research

Digital Research, Inc. (DR or DRI) was a privately held American software company created by Gary Kildall to market and develop his CP/M operating system and related 8-bit, 16-bit and 32-bit systems like MP/M, Concurrent DOS, FlexOS, Multiuser DOS, DOS Plus, DR DOS and GEM.

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DOS

DOS is a family of disk-based operating systems for IBM PC compatible computers.

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Expanded memory

In DOS memory management, expanded memory is a system of bank switching that provided additional memory to DOS programs beyond the limit of conventional memory (640 KiB).

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Intel

Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and incorporated in Delaware.

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Multiuser DOS

Multiuser DOS is a real-time multi-user multi-tasking operating system for IBM PC-compatible microcomputers.

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Multiuser DOS Federation

The Multiuser DOS Federation (MDOS) was an industry alliance to promote the growth and acceptance of multi-user DOS-based solutions on 286, 386 and 486 computers.

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Protected mode

In computing, protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units (CPUs).

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Quarterdeck Office Systems

Quarterdeck Office Systems, later Quarterdeck Corporation (NASDAQ: QDEK), was an American computer software company.

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Real mode

Real mode, also called real address mode, is an operating mode of all x86-compatible CPUs.

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Virtual DOS machine

Virtual DOS machines (VDM) refer to a technology that allows running 16-bit/32-bit DOS and 16-bit Windows programs when there is already another operating system running and controlling the hardware.

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