Microsoft finally open sources DOS 1.0 - and it's so much more than the code

Microsoft finally open sources DOS 1.0 - and it's so much more than the code ...
GIGAZINE

Why did Windows 95 Setup consist of three separate programs and make a direct upgrade from MS-DOS to Windows 95 impossible?

The setup file for Windows 95, which was released in 1995, consisted of three types of programs: MS-DOS, 16-bit, and 32-bit. When upgrading from MS-DOS, Windows 3.1 was installed along the way.
TechSpot

Did you know? Windows 95 used three different operating systems during setup

Retro Potato: Longtime Microsoft software engineer Raymond Chen recently responded to an intriguing retro-tech question posed by a game developer on X. The developer inquired about the three distinct ...
Popular Science

How to get MS-DOS up and running on Windows or macOS

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