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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Jeff Parsons 0639e8cbd2 Initial v1.18.2 delta: added support for ROM notification parameters that the Video component will accept
2015-05-22 12:33:33 -07:00
..
manifest.xml Initial v1.18.2 delta: added support for ROM notification parameters that the Video component will accept 2015-05-22 12:33:33 -07:00
MSDOS400M-DISK1.json Initial commit (a clone of the jsmachines project as of v1.15.3) 2014-09-27 14:52:57 -07:00
MSDOS400M-DISK2-UNPATCHED.json Initial commit (a clone of the jsmachines project as of v1.15.3) 2014-09-27 14:52:57 -07:00
MSDOS400M-DISK2.json Initial commit (a clone of the jsmachines project as of v1.15.3) 2014-09-27 14:52:57 -07:00
README.md Minor README tweaks 2014-12-16 14:14:30 -08:00

README.md

Multitasking MS-DOS 4.00

These disk images contain the first unearthed copy of Microsoft's "multitasking" version of MS-DOS. They were were discovered by the PCjs Project in March 2013. This version of MS-DOS was never officially released in North America. More information is available at Wikipedia and OS/2 Museum.

Note: The designation "4.0M" is not an official version number; it's an internal version number used only to differentiate these disk images from those of the official MS-DOS 4.00 release in July 1988.

The IBM Model 5160 machine configuration below boots MS-DOS 4.0M. To access the MS-DOS "Session Manager" after it's booted, tap the Alt key.

IBM Model 5160