Early versions
- Arulsha
- Sep 6, 2016
- 1 min read
Early versions
Main articles: Windows 1.0, Windows 2.0, and Windows 2.1x

Windows 1.0, the first version, released in 1985
The history of Windows dates back to September 1981, when Chase Bishop, a computer scientist, designed the first model of an electronic device and project Interface Manager was started. It was announced in November 1983 (after the Apple Lisa, but before the Macintosh) under the name “Windows”, but Windows 1.0 was not released until November 1985.[9] Windows 1.0 was to compete with Apple‘s operating system, but achieved little popularity. Windows 1.0 is not a complete operating system; rather, it extends MS-DOS. The shell of Windows 1.0 is a program known as the MS-DOS Executive. Components included Calculator, Calendar,Cardfile, Clipboard viewer, Clock, Control Panel, Notepad, Paint, Reversi, Terminal andWrite. Windows 1.0 does not allow overlapping windows. Instead all windows are tiled. Only modal dialog boxes may appear over other windows.
Windows 2.0 was released in December 1987, and was more popular than its predecessor. It features several improvements to the user interface and memory management.[citation needed] Windows 2.03 changed the OS from tiled windows to overlapping windows. The result of this change led to Apple Computer filing a suit against Microsoft alleging infringement on Apple’s copyrights.[10][11] Windows 2.0 also introduced more sophisticated keyboard shortcuts and could make use of expanded memory.
Windows 2.1 was released in two different versions: Windows/286 and Windows/386. Windows/386 uses the virtual 8086 mode of the Intel 80386 to multitask several DOS programs and the paged memory model to emulate expanded memory using availableextended memory. Windows/286, in spite of its name, runs on both Intel 8086 and Intel 80286 processors. It runs in real mode but can make use of the high memory area.[citation needed]
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