Topic 1

EARLY RECORDS 4,500 YEAR OLD TAX RECORD  Early civilization used calculating devices for  Business  Taxes

Stonehenge – Built approximately 2800 BC Used to track equinoxes and solstices

ABACUSSOVIET ABACUS  Invented by the Babylonians in 3,000 BC  Used by the Greeks and Romans  Used for calculations

Pascal’s Adding Machine (17 th Century) Mechanical odometer Can add, subtract, multiply, and divide

EARLY ELECTRONIC COMPUTER ENIAC  Electronic Numerical Integrator And Computer (ENIAC)  Used 18,000 vacuum tubes  Used by U.S. Army to computer ballistic firing tables  Could add, subtract, divide, multiply, and square roots

MECHANICAL RELAY STILL USED IN CARS AND TRUCKS VACUUM TUBE RARELY USED ANYMORE

TRANSISTORSINTEGRATED CIRCUITS

FIRST MICROPROCESSOR 1971 INTEL (4-BIT) INTEL XEON MICROPROCESSORS

ALTAIR 8800 BILL GATES WROTE BASIC PROGRAMS FOR THIS SYSTEM XEROX PARC (1972) FIRST GUI

STEVE WOZNIAK AND STEVE JOBS – BUILT FIRST APPLE COMPUTER IN THEIR GARAGE APPLE II – THE FIRST COMPUTER SYSTEM BY APPLE

The circuit board for the first Apple Computers

APPLE – LISA THE FIRST GUI FROM APPLE IT FAILED BECAUSE IT WAS TOO EXPENSIVE APPLE – MACINTOSH VERY SUCCESSFUL