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LADY ADA LOVELACE’S PROGRAMS
The instructions given to Babbage’s Analytical Engine
were in the form of 0’s and 1’s and the first person
to introduce this concept was Lady Ada Lovelace.
Since she was the first to introduce the concept of
programming, she is known as the first computer
programmer.
Lady Ada Lovelace
HERMAN HOLLERITH’S TABULATING MACHINE
Herman Hollerith, an army engineer, built a machine called the Tabulating
Machine in 1890. The machine read and stored data from punched cards. After the
success of this machine, Hollerith formed a Computing Tabulating Recording
Company to sell his machine. Later in 1924, his company became a part of
International Business Machines Corporation, today popularly known as IBM.
Hollerith’s Tabulating Machine Herman Hollerith
COMPUTER GENERATIONS
After these early calculating machines, the present computer took its shape in five
generations.
First Generation (1940s)
There were many computers that were a part of first generation computers.
MARK-I (The First Electro-Mechanical Powered Computer)
In 1944, Prof. Howard Aikens built the first
electro-mechanical computer named Mark-I. It
used punched cards and typewriter for input and
output. Mark-I was much more reliable than the
earlier electronic computers.
Mark-I
Evolution of Computers 9

