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Here's How I Got MS-DOS Running on My Linux Computer

Linux is very good at running older software, but even the free and open-source operating system is stumped by the really ancient stuff developed for MS-DOS. Let’s go over how you can get ...
Ars Technica

Microsoft open-sources infamously weird, RAM-hungry MS-DOS 4.00 release

Microsoft has open-sourced another bit of computing history this week: The company teamed up with IBM to release the source code of 1988’s MS-DOS 4.00, a version better known for its unpopularity, ...
TechSpot

Microsoft releases MS-DOS 4.0 source code and floppy images through an open-source license

TL;DR: Microsoft will likely never release the original source code of Windows into the wild, but the company is clearly interested in sharing important episodes of its software development history.
ZDNet

It's baaack! Microsoft and IBM open source MS-DOS 4.0

It's no joke. Microsoft and IBM have joined forces to open-source the 1988 operating system MS-DOS 4.0 under the MIT License. Why? Well, why not? That got Hanselman and Wilcox digging into the ...