CONFIG.SYS

CONFIG.SYS is the primary configuration file of the MS-DOS and OS/2 operating systems.

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It is composed mostly of name=value statements which look like variable assignments. In fact these will either define some tunable parameters often resulting in reservation of memory, or load files, mostly TSRs and device drivers, into memory.

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After reading the config.sys file, MS-DOS proceedes to load command.com, which then executes the autoexec.bat batch file.

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Both config.sys and autoexec.bat can still be found included in the system files of the later operating system Microsoft Windows. Usually these files are empty files, with no content. OS/2 did not use the autoexec.bat file.

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MS-DOS: Microsoft's disk operating system, MS-DOS was the dominant operating system for the PC compatible platform during the 1980s. It has gradually been replaced on consumer desktop computers with various generations of the Windows operating system....

OS/2: OS/2 is an operating system created by Microsoft and IBM and later developed by IBM exclusively. The name stands for "Operating System/2", because it was introduced as the preferred operating system for IBM's "Personal System/2 (PS/2)" line of second-generation Personal Computers....

Operating system: In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. Additionally, it provides a foundation upon which to run application software such as word processing programs and web browsers....