-
1940s
Was a time of vacuum tube technology and computers the size of classrooms.
Each computer was unique in structure and purpose. -
1950s
Were developed to meet the needs of new markets government and business.
The business environment placed much more importance on the cost effectiveness of the system. -
1960s
They were designed with faster CPUs, but their speed still caused problems when interacting with printers and other slower I / O devices. -
1970s
Multiprogramming schemes to increase CPU use were limited by the physical capacity of the main memory.
Computers had faster CPUs, creating an even greater disparity between their rapid processing speed and slower I/O access time. -
1980s
Firmware, a word used to indicate that a program is permanently held in read-only memory (ROM), as opposed to being held
in secondary storage. -
1990s
Web accessibility and e-mail became standard features of almost every operating system. However, also sparked increased demand for tighter security to protect hardware and software. -
2000s
The new century emphasized the need for operating systems to offer improved flexibility, reliability, and speed. The concept of virtual machines, was developed.
