Where it all beginsEach computer was unique in
structure and purpose.
A new concept appears, the firmwareHardware was more flexible, with logical functions built on
easily replaceable circuit boards.
The new centuryEmphasized the need for operating systems to offer improved
flexibility, reliability, and speed.
To meet the need for computers that could
accommo- date multiple operating systems running at the same time and sharing
resources, the concept of virtual machines.