​ABACUS

​*one of the first devices used to count and keep track of numbers.

​*introduced by the Romans in 500 CE

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​BINARY NUMBER SYSTEM

• the base-2 numeral system or binary numeral system, a method of mathematical expression which uses only two symbols: typically "0" and "1"

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• used in computers to manipulate and store data

​Altair 8800

​*designed by Ed Roberts , who owned calculator company MITS

​*first microcomputer kit

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​ALTAIR, con't

*Bill Gates and Paul Allan jumped at the chance to design a BASIC program to improve it

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​*inspired many computer enthusiasts, including Steve Jobs and Steve Wozniak of Apple

​Beginners' All-purpose Symbolic Instruction Code

​BASIC

• ​designed in 1950s in Dartmouth University

• ​simplified coding language

• ​more user freindly than previous language

​Apple Computers

• founded by Steve Jobs and Steve Wozniak ​in 1976 in their garage

• ​designed more user friendly personal computers

​ETHERNET

• developed in 1970s by XEROX

• technology to connect devices with local area​ network (LAN)