|Formats||numerous, see operating systems|
|numerous, see operating systems|
An operating system, or OS, is system software that manages hardware and software resources.
In the 1940s, electronic digital computers lacked operating systems. Tasks were controlled by switches or by plugs on a plugboard.
In the early 1950s, general-purpose computers were developed. These computers could run any task given to them, although they could only execute one program at a time.
Another program could not be executed until the task was completed or the computer crashed.
The program was managed by a resident monitor, the precursor of the operating system. The resident monitor was an extremely small program that was resident in the limited memory of the computer.
The resident monitor would control the computer before and after a job by executing non-resident programs for setup and cleanup procedures.
Computers with internal libraries of programs
Another precursor to the operating system came in the mid-1950s. Computers of this era contained libraries of programs.
A program was inserted on external media and one of the internal libraries would be called upon to help with the media inserted.
The drawback of these internal libraries was that, like the earlier resident monitor, only one program could be executed at a time.
It was based on the General Motors-developed resident monitor on the IBM 701.
GM-NAA I/O was designed for batch processing wherein a program would be automatically executed once another program was completed.
SHARE Operating System
The SHARE Operating System was the first operating system that referred to itself as such. It was created in 1958 by the SHARE user group as an improvement on the GM-NAA I/O operating system. As the name suggests, it was designed to improve the sharing of programs.
It was the operating system for the vacuum tube-based computer, the IBM 709, which was released in 1958. It was also ported to the transistor-based update of the 709, the IBM 7090, which was released in 1959.
Operating systems owned by WEC Museum
|Title||First release||Date Added to the Museum||Notes|
|Android||2008||August 7, 2015||Installed on the Samsung Galaxy Core Prime.|
|Chrome OS||2011||December 30, 2021||On the Lenovo Chromebook 3|
|FreeDOS||1998||October 31, 2019||FreeDOS is installed on DOSBox on the Mac Mini.|
|iOS||2007||May 30, 2014||Installed on the iPad and iPod Touch.|
|Linux||1991||June 7, 2014||Ubuntu is on a partition of the Mac Mini. A Linux kernel also runs the NES Classic Edition, the Famicom Mini, the Shonen Jump Famicom Mini, the SNES Classic Edition, the Super Famicom Mini, and Super Retro Cade.|
|macOS||2001||June 7, 2014||Sierra (10.4) is installed on the MacBook Air and Catalina (10.15) is on a partition of the Mac Mini.|
|MS-DOS||1980||February 6, 2021||WEC Museum owns MS-DOS 3.3 distributed by AGI Computer.|
|Windows 10||2015||July 15, 2015||It is installed on the Bootcamp partition on the Mac Mini.|
|Windows CE||1985||July 6, 2022||Windows CE 6.0 is installed on the SYNET7WID.|
|Windows NT 4||2016||May 15, 2020||WEC Museum owns Windows NT Workstation 4.0.|