| Filename | Latest commit message | Latest commit date |
|---|---|---|
| .. | ||
| machine.xml | ||
| README.md | ||
| layout | title | permalink | machines | |||||
|---|---|---|---|---|---|---|---|---|
| page | IBM PC XT (Model 5160) with Multitasking MS-DOS 4.00 | /devices/pc/machine/5160/cga/640kb/dos400m/ |
|
Multitasking MS-DOS 4.00
This simulation demonstrates the first unearthed copy of Microsoft's "multitasking" version of MS-DOS. The original images 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 PCjs machine configuration below boots MS-DOS 4.0M. To access the MS-DOS "Session Manager" after it's booted, tap the Alt key.
{% include machine.html id="ibm5160" %}