Facepalm: Microsoft deserves kudos for open-sourcing the MS-DOS 4.00 source code, shedding light on an important milestone in computing history. But the tech giant has bungled the release in a way ...

The company worked with IBM to release a 1998 uncompiled version DOS 4.0 on Thursday, although unfortunately, this release lacks the app-switching capabilities that landed it the nickname MT-DOS.

Every once in awhile Ars publishes DOS articles, which gets me thinking about DOS again, and I thought, perhaps there would be value in DOS perpetual thread on the Forums, for non-article-specific DOS ...