Microsoft open-sources infamously bizarre, RAM-hungry MS-DOS 4.00 launch

A DOS prompt.

Enlarge / A DOS immediate.

Microsoft has open-sourced one other little bit of computing historical past this week: The corporate teamed up with IBM to launch the supply code of 1988’s MS-DOS 4.00, a model higher identified for its unpopularity, bugginess, and convoluted growth historical past than its utility as a pc working system.

The MS-DOS 4.00 code is accessible on Microsoft’s MS-DOS GitHub web page together with variations 1.25 and a pair of.0, which Microsoft open-sourced in cooperation with the Laptop Historical past Museum again in 2014. All open-source variations of DOS have been launched underneath the MIT License.

Initially, MS-DOS 4.00 was slated to incorporate new multitasking options that permit software program to run within the background. This launch of DOS, additionally typically known as “MT-DOS” or “Mutitasking MS-DOS” to differentiate it from different releases, was solely launched by way of a couple of European PC OEMs and by no means as a standalone retail product.

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