Fourth Generation (1980-1990): personal computers

•   The development of LSI (Large Scale Integration) circuits introduce the use of personal computer

•   Powerful personal computer use by business, universities and government are usually called workstations

•  1980’s – Growth of personal computer running network OS and distributed OS.

•  Network OS – User can log in into remote machine and copy file from one machine to another Each machine run it own local OS and has it own user

•  Distributed OS

                - Appears to its users as a traditional unit processor system, actually composed of multiple processor system






Disediakan oleh Syahir (F1069)

Third Generation (1955-1965): ICs and Multiprogramming

•   Early 1960 – Most manufacturer had two distinct, totally incompatible, produce lines.

                1) Word Oriented

                - large scale scientific computer, example: IBM 7094

                2) Character Oriented

•   IBM 360 – first major computer line to use small scale integrated circuit (IC)

                - major price/ performance advantage over second generation machine

•   IBM 7094 – used a technique called multiprogramming.

                - Ability to process the next before the first job is finished.

•   Spooling (Simultaneous peripheral operation on line)

                - Ability to read jobs from cards onto disk

                - Whenever a running job is finished, OS could load a new job from disk into the now empty partition and run it

Disediakan oleh Syahir (F1069)