MS-DOS 4.0, with multitasking capabilities and FAT16 support, has been open-sourced on GitHub by Microsoft and IBM under the MIT License, providing access to previously unreleased files.
The multitasking MS-DOS project faced challenges due to memory limitations on PC architecture, affecting the ability to run multiple software packages concurrently.
Microsoft focused on the transition to the new 286 processor by ensuring upward and downward compatibility for existing and new programs within the multitasking MS-DOS environment.
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