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In DOS, CONFIG.SYS is located in the root directory of the drive from which the system was booted. The filename is also used by Disk Control Program (DCP), an MS-DOS derivative by the former East-German VEB Robotron. [1] Some versions of DOS will probe for alternative filenames taking precedence over the default CONFIG.SYS filename if they exist:
MSDOS.SYS is a system file in MS-DOS and Windows 9x operating systems. In versions of MS-DOS from 1.1x through 6.22, the file comprises the MS-DOS kernel and is responsible for file access and program management. MSDOS.SYS is loaded by the DOS BIOS IO.SYS as part of the boot procedure. [1] In some OEM versions of MS-DOS, the file is named MSDOS ...
MS-DOS / PC DOS and some related disk operating systems use the files mentioned here. System Files: [1] IO.SYS (or IBMBIO.COM): This contains the system initialization code and builtin device drivers; MSDOS.SYS (or IBMDOS.COM): This contains the DOS kernel. Command-line interpreter (Shell): COMMAND.COM: This is the command interpreter.
MS-DOS itself primarily relied on just one configuration file, CONFIG.SYS.This was a plain text file with simple key–value pairs (e.g. DEVICEHIGH=C:\DOS\ANSI.SYS) until MS-DOS 6, which introduced an INI-file style format.
Most DOS .sys files are real mode device drivers. [1] Certain files using this extension are not, however: MSDOS.SYS and IO.SYS are core operating system files in MS-DOS and Windows 9x. CONFIG.SYS is a text file that contains various configuration options and specifies what device drivers will be loaded. [2] [3]
Windows 95 and Windows 98 now analyse CONFIG.SYS and load MS-DOS real mode drivers. Windows ME ignores this. If the CONFIG.SYS file does not exist, the IO.SYS file loads the drivers IFSHLP.SYS, HIMEM.SYS and SETVER.EXE. Windows reserves all upper memory blocks for Windows 95 operating system use or for expanded memory.
During the boot phase, CONFIG.SYS and AUTOEXEC.BAT are executed, along with the configuration settings files WIN.INI and SYSTEM.INI. Virtual device drivers are also loaded in the startup process: they are most commonly loaded from the registry (HKLM\System\CurrentControlSet\Services\VxD) or from the SYSTEM.INI file. MS-DOS starts WIN.COM.
MSCDEX or Microsoft CD-ROM Extensions is a software program produced by Microsoft and included with MS-DOS 6.x [1] and certain versions of Windows to provide CD-ROM support. [2] Earlier versions of MSCDEX since 1986 were installable add-ons for MS-DOS 3.1 and higher.