| Filename | Latest commit message | Latest commit date |
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0f06c3f039
Some other interesting bugs were fixed along the way: the Video component incorrectly assumed that masking a negative number with 0x80000000 would yield 0x80000000 (it actually yields -0x80000000, thank you JavaScript); the ChipSet component provides a new addCMOSMemory() interface that RAM objects can use to bump the CMOS total to match the actual total; the CPU properly implements INSW and OUTSW instructions now (kind of important for the AT hard disk controller) |
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| .. | ||
| machine.xml | ||
| README.md | ||
"Multitasking" MS-DOS 4.00
This simulation demonstrates the first unearthed copy of Microsoft's "multitasking" version of MS-DOS. The original images were released on jsmachines.net in March, 2013, and have since been copied to other web sites. 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, released in June, 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.