16 lines
899 B
Markdown
16 lines
899 B
Markdown
Multitasking MS-DOS 4.00
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These disk images contain the first unearthed copy of Microsoft's "multitasking" version of MS-DOS.
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They were were discovered by the [PCjs Project](/docs/about/) in March 2013.
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This version of MS-DOS was never officially released in North America. More information is available at
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[Wikipedia](http://en.wikipedia.org/wiki/Multi-tasking_MS-DOS_4.0) and
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[OS/2 Museum](http://www.os2museum.com/wp/?p=1769).
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Note: The designation "4.0M" is not an official version number; it's an internal version number used only to
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differentiate these disk images from those of the official MS-DOS 4.00 release in July 1988.
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The [IBM Model 5160](/devices/pc/machine/) machine configuration below boots MS-DOS 4.0M. To access the MS-DOS
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"Session Manager" after it's booted, tap the **Alt** key.
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[IBM Model 5160](/devices/pc/machine/5160/cga/640kb/dos400m/ "PCjs:ibm5160:::debugger")
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