MS-DOS 4.0 (multitasking)
Multitasking MS-DOS 4.00 COMMAND.COM session running in VirtualBox. | |
| Developer | Microsoft |
|---|---|
| Written in | x86 assembly |
| OS family | DOS |
| Source model | Open source |
| Initial release | May 15, 1986 |
| Final release | 4.10.30 / May 10, 1988 |
| Update method | Re-installation |
| Package manager | None |
| Platforms | x86 |
| Kernel type | Monolithic |
| Default user interface | Command-line interface (COMMAND.COM) |
| License | MIT License |
| Support status | |
| Unsupported | |
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.