OldOS.org, haettu 20.6.2008(Arkistoitu – Internet Archive) "In a project starting as early as 1983, Microsoft began work on MS-DOS 3, a multitasking version of DOS (it was known as DOS 3 as the Real Mode DOS 2 was currently shipping). When the 'real' mode DOS 3 shipped, the project changed name to DOS 4. By 1987, in the text, 'Exploiting MS-DOS', the project was the subject of heavy speculation, with one possible name being banded around was 286-DOS, with Microsoft promising full, pre-emptive multi-tasking and full network support, and have Xenix support. However, by this time, IBM and Microsoft had already signed their Joint Development Agreement; the infant steps in OS/2's birth were taken. OS/2 version 1.0 was released in December 1987, coinciding with the launch of IBM's PS/2 Computer."
OldOS.org, haettu 20.6.2008(Arkistoitu – Internet Archive) "In a project starting as early as 1983, Microsoft began work on MS-DOS 3, a multitasking version of DOS (it was known as DOS 3 as the Real Mode DOS 2 was currently shipping). When the 'real' mode DOS 3 shipped, the project changed name to DOS 4. By 1987, in the text, 'Exploiting MS-DOS', the project was the subject of heavy speculation, with one possible name being banded around was 286-DOS, with Microsoft promising full, pre-emptive multi-tasking and full network support, and have Xenix support. However, by this time, IBM and Microsoft had already signed their Joint Development Agreement; the infant steps in OS/2's birth were taken. OS/2 version 1.0 was released in December 1987, coinciding with the launch of IBM's PS/2 Computer."
