He still oversees the project to this day. MS-DOS, IBM-DOS, and other DOS derivatives were the most popular operating systems for PCs from the first IBM PC in 1981 to around the mid-1990s.

To get the answer, just put a decimal point in the number "50"—my first Microsoft product was MS-DOS 5.0.

[Yeo Kheng Meng] didn’t cheat by simply running MS-DOS on a modern PC, either: he tested the client on a real 1984 vintage IBM 5155 Portable PC. This semi-portable PC/XT model sports a 4.77 MHz ...

Now, thanks to [Mike Chambers], you can add to the IRC ecosystem by hosting your very own MS-DOS based IRC server ... can get up on the 40-year-old IBM 5150, and should absolutely scream on ...

A white paper from the company has shown that both application software and operating systems suffer from the limitations of MS-DOS. When IBM and Microsoft fell out several years ago over the DOS ...