Microsoft open sources MS-DOS 4.0


Microsoft has introduced that it’s open sourcing MS-DOS 4.0, in collaboration with IBM, who developed parts of the code. It will likely be accessible beneath the MIT license. 

This happened as a result of an English researcher, Connor “Starfrost” Hyde was exploring the connection between DOS 4, MT-DOS (Multitasking DOS), and OS/2, and was in communication with Ray Ozzie, chief technical officer at Microsoft, about his assortment. Starfrost discovered unreleased beta binaries of MS-DOS 4.0 on floppy disks within the assortment, prompting him to achieve out to the Microsoft Open Supply Applications Workplace to see concerning the potential for releasing the complete supply code. 

Based on Microsoft, these floppies contained elements of MT-DOS, a few of which may already be discovered on the web, nevertheless it was decided that what they’d discovered right here was a a lot earlier and unreleased model. 

Scott Hanselman, vp of Microsoft’s Developer Division, and Jeff Sponaugle, an web archivist, then imaged the disks and scanned the unique printed paperwork from the discharge. 

Whereas they weren’t capable of finding everything of MT-DOS, they did discover MS DOS 4.0. It’s being launched, in addition to the beta binaries of MT-DOS, PDFs of documentation, and disk photos. 

“Thanks to Ray Ozzie, Starfrost, Jeff Sponaugle, Larry Osterman, Mark Zbikowski, our pals on the IBM OSPO, in addition to the makers of such digital archeology software program together with, however not restricted to Greaseweazle, Fluxengine, Aaru Knowledge Preservation Suite, and the HxC Floppy Emulator. Above all, thanks to the unique authors of this code, a few of whom nonetheless work at Microsoft and IBM right this moment,” Hanselman and Jeff Wilcox, head of the Open Supply Program Workplace at Microsoft, wrote in a weblog publish.  

This announcement coincides with the ten 12 months anniversary of Microsoft donating the supply code for MS-DOS 1.25 and a couple of.0 to the Pc Historical past Museum after which releasing the supply code to the general public as effectively.

“This code holds an necessary place in historical past and is a captivating learn of an working system that was written completely in 8086 meeting code almost 45 years in the past,” Hanselman and Wilcox wrote. 

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