HISTORY OF COMPUTERS

• 1 . The Dark Age (3000 B.C  -  1890 A.D)

ABBACUS
About  3000 B.C   the “ Abbacus ”  was   developed  by  CHINA.

Napier’s Bones

In 1617 A .D  John Napier designed  a device“ Napier’s Bones.

• 2 . The Middle Age  (1890 A.D  -  1944 A.D) 

  Dr.Herman Hollerith , developed  a  3 X 4 inch  Punch Card

Dr.James Power developed  20 -column Punching Machine.

• 3 . The Modern Age  (Since  1944 A.D )
• In 1944, an Electro-Mechanical computer “ Mark - I “ was build by
  IBM .  Mark -II  was  launched  in 1945.
  Afterwards fully electronic computers were developed.