The open-sourcing of this version of MS-DOS was made possibly by a researcher, who got in touch with Microsoft regarding some unreleased beta binaries of DOS 4.0 they'd found on a stack of old ...

DIY Tech Hacks How to get MS-DOS up and running on Windows or macOS Take a trip to the past—and load up some classic apps and games. David Nield Aug 31, 2024 1:03 PM EDT ...