Composition examples for CONFIG.SYS file are shown in articles 9.01-01, 9.04-01 and 9.09-01. Drivers with *.SYS suffix must be loaded by DEVICE (4.06) or DEVICEHIGH (4.07) commands from lines of configuration file CONFIG.SYS. Proper choice and renewal of drivers is an important factor for DOS's survival amongst ever changing PC's hardware.ĭrivers may be presented in a form of files with special header (A.05-1), most often marked with *.SYS suffix, or in a form of ordinary executable files (*.COM or *.EXE) having a TSR (Terminate and Stay Resident) part. MS-DOS combines a limited number of main core's functions with various functional extensions, provided by drivers. This mode of action is similar to the "life" of operating system's core. When this particular occasion happens, driver's code is executed, performs its mission and then again is left waiting for the next request. Resident code is the code adapted for being written into RAM (random accessed memory) and left there, waiting for its chance of being requested on certain occasion(s). Drivers are files with executable resident code inside.
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