1. History of Computers

2. ABACUS-- 500BC -AN ANCIENT CALCULATING MACHINE

3. CHARLES BABBAGE 1834 – ANALYTICAL ENGINE HAD THE IDEA FOR THE FIRST COMPUTER (it did not work)

4. Reconstruction of the Babbage Computer – London Science Museum The final machine, which was constructed from cast iron, bronze and steel, consisted of 4,000 components, weighed three tons, and was 10 feet wide and 6½ feet tall. http://www.sciencemuseum.org.uk/galle ryguide/E2050.asp

5. Keyboard The Sholes (QWERTY) Keyboard or the keyboard as we know it – was invented in 1874 http://www.maxmon.com/1874ad.htm

6. ENIAC– 1946 -THE FIRST ELECTRONIC COMPUTER -USED VACUUM TUBE SWITCHES

7. 1971 – THE FLOPPY DISK Developed by SHUGART AND IBM NICKNAMED “FLOPPY” BECAUSE IT WAS FLEXIBLE

8. 1977 – Apple Macintosh Computer 1985 – Microsoft Windows 1981 - The IBM Personal Computer 1975 – Atari II offered to the public – the first computer the public could buy for home.

9. Interesting Fact For your interest...... In 1975, an IBM mainframe computer that could perform 10,000,000 instructions per second cost around $10,000,000. In 1995 (only twenty years later), a computer video game capable of performing 500,000,000 million instructions per second was available for approximately $500!