MS-DOS 4.01

Additional features:
 * Support for graphic video adapters EGA, VGA,
 * The volume of logical disks - more than 32 MB.,
 * Support for LIM / EMS standard (driver EMM386.sys, access to additional RAM memory on IBM PC AT-386 and higher), which allowed individual parts of MS DOS to load into additional memory
 * There was a full-fledged support of the Russian language.
 * Improving the program Select. Now this program greatly simplifies the process of installation and configuration of the system. It automatically creates the appropriate config.sys and autoexec.bat files.
 * The introduction of a new mem command, which allows you to analyze the current memory card.
 * Four countries are included in the list of supported countries.
 * Graphic printing
 * Various new features in existing commands: tree delete mode append fastopen nlsfunc attrib fdisk replace backup graftabl select country graphics
 * Improved system drivers, including: ansi.sys driver.sys display.sys printer.sys
 * MS-DOS shell

It was released in November 1988.