History of Operating Systems

Operating systems have evolved dramatically since the dawn of computing. What started as manual wire-plugging has transformed into the complex software running our laptops and smartphones today.

In the early days, there were absolutely no operating systems. Computers were enormous machines built with vacuum tubes. Programmers had to manually physically plug wires into plugboards to write a program.

Later, punch cards were introduced, allowing programmers to write code on paper cards and feed them into the machine, but there was still no software managing the hardware.

The invention of the transistor made computers smaller and more reliable. This era introduced Batch Processing.

Instead of running one job at a time, similar jobs were grouped into batches on magnetic tape and processed sequentially. The very first rudimentary operating system, GM-NAA I/O, was created in 1956 by General Motors for IBM's mainframes.

Integrated Circuits (ICs) revolutionized computing again. This generation introduced the revolutionary concept of Multiprogramming and Time-Sharing.

For the first time, an operating system could keep multiple programs in memory simultaneously, switching between them to keep the CPU busy. Famous operating systems like MULTICS and UNIX were born in this era.

The invention of microprocessors led to the era of Personal Computers (PCs). Operating systems moved away from purely text-based command lines to Graphical User Interfaces (GUIs), making computing accessible to everyone.

This era gave rise to Microsoft Windows, Apple macOS, and eventually mobile operating systems like iOS and Android.