Operating Systems

Early computers came with none—you had to give all the instructions to the computer with every program.

Then libraries of instructions were developed so that you could just include those.

As storage for programs grew, and computers became more complex, it be came necessary to develop operating systems.

A Little History

A piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined positions.

Early computers used punched cards as the primary medium for input of both computer programs and data.

Punched Card

DOS stands for Disk Operating System An operating system (OS) is software that runs

on computers and manages the computer hardware.

It also provides common services for efficient execution of various application software.

MS DOS was Microsoft’s branded version of DOS There were plenty of other OS’s out in the wild,

such as UNIX, OS/2, Amiga’s OS, and Apple’s OS Introduction of the GUI (Graphical User Interface)

Along Comes DOS

What we currently refer to as an Operating System, is generally far more than just an operating system.

There are lots of operating systems out there running all kinds of devices, such as your cell phone, video game console, and web servers.

Steve Jobs of Apple: “To be innovative technological products, you need to develop both the hardware and the software.”

Modern Operating Systems