The Pascaline

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The Pascaline
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The Stepped Reckoner
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The Analytical Engine
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Tabulating Machine
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The Mark I
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(No Transcript)
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The real power of a computer
Data flows from the input to the memory. The CPU
accesses the memory, Makes decisions, and then
returns its decisions to memory. This
decision Is then output to the user.
Output
Input
Memory (storage)
The Central Processing Unit is the part of
the computer that makes all the decisions (does
all the calculations).
CPU (Decision-making or processing)
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Take a pause for the cause.

• In your opinion, what are the 5 most important
  inventions of all time?

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The most important inventions of all-time

• Printing press
• Clock or watch
• Lightbulb (electricity)
• Telephone
• Car
• Wheel
• Plow
• a controversial one

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and the transistor
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Tubes to Transistors
Relative size of each
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The integrated circuit many transistors
(switches) in one package
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Mainframes
These are just terminals (or dummies). No
processing is done here
The mainframe does all the calculations and
decision-making
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Modern desktop computers The CPU