1. Abacus - calculation tool
Abacus was invented in between 1000 BC - 500 BC in
Mesopotamia and China. An abacus is a calculation tool,
constructed as a wooden frame with beads sliding on
wires. The first abacus was based on a flat stone
covered with sand or dust. Words and letters were
drawn in the sand, eventually numbers were added and
pebbles used to aid calculations.
2. Antikythera mechanism
• The Antikythera
mechanism is an
ancient mechanical
analog computer
designed to calculate
astronomical
positions.
• 150-100 BC
• The device is about
33 cm (13 in) high,
17 cm (6.7 in) wide,
and 9 cm (3.5 in)
thick, made of bronze
and originally
mounted in a wooden
frame.
5. • Yr 1939 - 1946
• Dr. Howard Aiken of
Harvard completed
the basic plans for a
sequential, digital,
electromechanical
computer - Father
of all modern
computers
7. Electronic Numeric Integrated
Automatic Computer - ENIAC
weighed nearly 30
tons and occupied It was the major
15,000 square feet instrument for the
of floor space. computation of all
contained more than ballistic tables for
19,000 vacuum the U.S. Army and
tubes which were Air Force
used to perform
5,000 additions per
second
