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CONFIG.SYS
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<p>CONFIG.SYS is the primary <a href="/facts/Configuration_file/DDzU0FLJ">configuration file</a> for the <a href="/facts/DOS/6nkoK02J">DOS</a> and <a href="/facts/OS%2f2/uVBl6ItP">OS/2</a> <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>. It is a special <a href="/facts/ASCII/vGUI33Qu">ASCII</a> text file that contains user-accessible setup or configuration directives evaluated by the operating system's <a href="/facts/DOS_BIOS/gDj9lqoY">DOS BIOS</a> (typically residing in <a href="/facts/IBMBIO.COM/gDj9lqoY">IBMBIO.COM</a> or <a href="/facts/IO.SYS/z6GETtk6">IO.SYS</a>) during boot. CONFIG.SYS was introduced with DOS 2.0. </p>