You asked: What operating system was used by the earliest computers?

What are the 5 operating system?

Five of the most common operating systems are Microsoft Windows, Apple macOS, Linux, Android and Apple’s iOS.

Is DOS still used in Windows 10?

There’s no “DOS”, nor NTVDM. … And in fact for many TUI programs that one can run on Windows NT, including all of the tools in Microsoft’s various Resource Kits, there is still no whiff of DOS anywhere in the picture, because these are all ordinary Win32 programs that perform Win32 console I/O, too.