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Legacy systems



Legacy systems are the software and the hardware of a company’s IT system.  Companies put large amounts of money into legacy systems. 

Mainframe computers

Mainframe computers were first developed in the year 1951.  When these mainframe computers were first built they used vacuum-tube technology.


The microprocessor is also known as a computer on a chip.  They were created in the year 1970.  The microprocessors were the start of desktop computers.


PCs are known as personal computers.  These are well known today as desktop computers.  The personal computer was created in the year 1976.  PCs became well known in the 1980’s.

Network computers

Network computers are also known as NC.  They were used up to the year 2000.  Network computers were made by IBM, DEC, and HP.  These companies made it so that network servers could transmit information from one personal computer to another.

World Wide Web and Internet

The web was created to allow easier communication between networks.  The world wide web allowed businesses to communicate with one another around the world.

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