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pcjs/disks/pc/dos/microsoft/4.0M
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Filename Latest commit message Latest commit date
Jeff Parsons 0f06c3f039 The 5170 AT hard disk controller is limping along now, so I'm getting ready for a 1.15.4 release 
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)
2014-10-08 16:15:12 -07:00
..
manifest.xml The 5170 AT hard disk controller is limping along now, so I'm getting ready for a 1.15.4 release 2014-10-08 16:15:12 -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 Initial commit (a clone of the jsmachines project as of v1.15.3) 2014-09-27 14:52:57 -07:00

README.md

"Multitasking" MS-DOS 4.00

This was first unearthed copy of Microsoft's "multitasking" version of MS-DOS. It's since been copied to other web sites, but these are the original images, released on jsmachines.net 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, released in June, 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