MS-DOS 4.0 (multitasking)

MS-DOS 4.0 was a multitasking release of MS-DOS developed by Microsoft based on MS-DOS 2.0. Lack of interest from OEMs, particularly IBM (who previously gave Microsoft multitasking code on IBM PC DOS included with TopView), led to it being released only in a scaled-back form. It is sometimes referred to as European MS-DOS 4.0, as it was primarily used there. It should not be confused with PC DOS 4.00 or MS-DOS 4.01 and later, which did not contain the multi-tasking features.

"MS-DOS 4.0" redirects here. For the non-multitasking version, see MS-DOS 4.00 (IBM-developed).

MS-DOS 4.0
Multitasking MS-DOS 4.00 Command.com Session on VirtualBox VM.
DeveloperMicrosoft
Written inx86 assembly
OS familyDOS
Source modelClosed source
Initial releaseMay 15, 1986 (May 15, 1986)
Final release4.10.30 / May 10, 1988 (May 10, 1988)
Update methodRe-installation
Package managerNone
Platformsx86
Kernel typeMonolithic
Default
user interface		Command-line interface (COMMAND.COM)
LicenseProprietary
Support status
Unsupported
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