History of Computers

ABACUS-- 500BC -AN ANCIENT CALCULATING MACHINE

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

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. ryguide/E2050.asp

Keyboard The Sholes (QWERTY) Keyboard or the keyboard as we know it – was invented in

ENIAC– THE FIRST ELECTRONIC COMPUTER -USED VACUUM TUBE SWITCHES

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

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

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!