CARD READERS

Computers have undergone revolutionary changes with the advent of integrated circuit technology. Before the appearance of these modern technologies, one of the most popular input devices was the CARD READER. The data to be fed into computer are punched on these cards using punching machines. Computer punch card is a special card of size of 7.5” x 3.25” x 0.007”. It has 12 rows and 80 columns. A special device called punching machine, whose key board is similar to the key board of modern computers, was used to punch data and information on the card. Each character punched will produce a unique set of holes, row-wise in the particular column where the character is punched. The advent of modern technologies has made cards and card readers obsolete.