THE PARALLEL BINARY ADDER

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THE PARALLEL BINARY ADDER

• BY
• MATHEW AU
• AKSHAY AHOOJA

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The History Of The Calculator
Ancient Times - The abacus is the main aid to
calculation. 1600 - "Napier's bones" invented by
John Napier for multiplication, based on the
ancient numerical scheme known as the Arabian
lattice. 1623 - Willhelm Schickard invented the
"Calculating Clock", the first mechanical
calculator. It used a version of Napier's bones
for multiplication with a mechanical
adding/subtracting calculator based on gears,
with mutilated gears for carry. 1642 - Blaise
Pascal started to develop a mechanical calculator
- the Pascaline. Capable of addition, subtraction
was performed by nines-complement addition, and
multiplication was performed by repeated
additions and subtractions. It had shortcomings
and failed to sell. 1853 - The Scheutz
Difference Engine completed the world's first
printing calculator. 1878 - The first direct
multiplication machine was built by Raymond Verea
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History (Continued)
1900 - 1960- Mechanical calculators developed
slowly - electric motor drive, reduction in size,
added features (eg. automatic multiplication
division). 1948 - Curta miniature hand-held
mechanical calculator introduced 1960 - First
electronic desktop calculator - Bell
Punch/Sumlock Anita Mk VII - based on
cold-cathode vacuum tubes 1970 - First hand-held
calculators 1972 - First scientific pocket
calculator introduced 1977 - Solar powered
calculators introduced.
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HOW IT WORKS?

• 510
• 410
• 910

IN BINARY 1012 1002
10012
4 2 1
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HOW IT WORKS (Continued)
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1
0
1
0
0
FA
FA
HA
0
0
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1
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HA Half Adder FA- Full Adder
Carry
ANSWER 1 0 0 12 ? 910
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CIRCUIT DIAGRAM
HA - Red FA1- Green FA2 -Blue
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THE BREADBOARD
HA - Red FA1- Green FA2 -Blue
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AKSHAY AHOOJA MATT AU THE END