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Chapter Profile
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 a typewriter for input and output. Mark-I was
much more reliable than early electronic computers.
Mark-I
Evolution of Computers 9

