Articles about MS-DOS

Microsoft, in partnership with IBM, has released the source code of MS-DOS 4.00 under the open-source MIT license. This release comes a decade after Microsoft first made the source code for MS-DOS 1.25 and 2.0 available to the public through the Computer History Museum.

The decision to release the MS-DOS 4.00 source code was inspired by the discovery of early, unreleased beta binaries by researcher Connor “Starfrost” Hyde. Hyde’s discovery stemmed from a conversation with former Microsoft Chief Technical Officer Ray Ozzie, who unearthed the binaries among floppies sent to him during his tenure at Lotus. Intrigued by the software’s historical value, Hyde approached the Microsoft Open Source Programs Office (OSPO) to explore the possibility of making these resources publicly available.

Continue reading →

These days, we take Windows' built-in zip support for granted, even if we prefer to use an alternative tool like 7-Zip. The story of how Microsoft added zip functionality to its operating system is an interesting one, and the guy responsible for it reveals how its creation nearly got him fired from his job at the tech giant.

Dave Plummer is a retired operating system engineer for Microsoft who worked on MS-DOS and Windows 95, among other things. He wrote the zip file support for Microsoft’s Windows 95 Plus pack, a feature which became an integral part of Windows 98 onwards and which, in his own words, "hasn’t really changed all that much in the 30 years since."

Continue reading →

Five years ago, the Internet Archive added 2,400 playable DOS games to its site, including 90s classics like Duke Nukem 3D, Prince of Persia, Championship Manager, The Incredible Machine, Eye of the Beholder (and its sequels), Hexen, Sim City, and Wolfenstein 3D.

Over the years, a number of additional games have been added to the collection, but the Internet Archive has made what it says is its biggest update yet, introducing another 2,500 MS-DOS titles.

Continue reading →

Back in 2014, Microsoft gave the source code for MS-DOS 1.25 and MS-DOS 2.0 to the Computer History Museum. Now -- in a move it describes as "re-open-sourcing" -- the company has pushed the code to GitHub for all to see.

Dating from mid-1983, the source code may moisten the eyes of anyone who remembers the days of text-based operating systems, and it gives an interesting glimpse into the world of software development a few decades ago.

Continue reading →