MS-DOS 4

MS-DOS 4 is a family of versions of MS-DOS, initially released in July 1988.

New features and changes

 * Support for EGA and VGA display adapters.
 * Support for FAT16 partitions larger than 32 MB.
 * Support for the LIM / EMS standard (driver, access to additional memory on 386-based systems and higher), which allowed individual parts of the operating system to load into additional memory.
 * Drastic improvements in functionality with the Select installation program. It now automatically creates the appropriate  and   files.
 * The introduction of a new  command, which allows users to analyze the current memory configuration.
 * Four countries were added in the list of supported regions.
 * Graphic printing was added.
 * Various new features in existing commands, which includes:,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  ,.
 * Improved system drivers, including:,  ,  ,.
 * MS-DOS shell was added.
 * The  program for setting up DOS on a hard disk has been transformed into a full-fledged setup wizard. Keyboard layout and install directory are now specified inside of the wizard rather than as parameters specified for.

History
Initially, the project was named "MS-DOS 3.40", and under this name was mentioned in the 1988-09 issue of Serbian computer magazine "Svet Kompjutera", as well as in a contract between Microsoft and Zenith Data Systems from August 1987.

MS-DOS 4.00 was released in July 1988, only to be replaced by MS-DOS 4.01 in November 1988 due to major bugs in the shell and in the memory management system. MS-DOS 4.02 was also mentioned in PX05132, however, if existing, it is yet to be found.

MS-DOS 4.00

 * RM Nimbus
 * Sampo

MS-DOS 4.01

 * AGI
 * Amstrad
 * AST
 * Bondwell
 * Emerson
 * EPSON
 * HP
 * Inves
 * Mitac
 * Olivetti
 * Packard Bell
 * Philips
 * Phoenix
 * RM Nimbus
 * Sharp
 * Trigem
 * Tulip
 * Twinhead
 * VEGAS
 * Zenith

MS-DOS 4.01a

 * Nokia
 * Victor

MS-DOS 4.01d

 * Compaq