Depends on your definition of a computer. An abacus could be somewhat considered a computer in some people's opinion. The Zuse Z3 was the world's first programmable automated machine, and was designed by Konrad Zuse and completed in 1941 in Germany. The first commercial digital computer was The Zuse Z4.
If your def of a computer requires a Graphical User Interface and mouse, the first would be the Xerox Alto in 1973. It wasn't commercial, but used by Xerox and Universities. The first commercial computer with a GUI and mouse is the Macintosh made by Apple in 1984.
Eggerland - Family Computer Disk System - was created on 1987-01-29.
Gjon Smith
actually operating system intermediary between user of the computer and hardware of the computer that's why operating system was created to provide proper functioning of computer hardware and to satisfy user requirements in this multi-programming environment .
The Macintosh Operating System (Mac OS) was created to provide an operating system for the Macintosh computer.
the first computer to use operating system was mark1
An environment (created by an emulation software) where an other computer's operating system (as well as its programs) can be run.
Xerox
Bill Gates, the founder of the Microsoft Corporation.
Virtual Machine
U.S. Department of Defense
computer system
A system that includes one or more computer, or a computer regarded as a system.