Introduction to Computer Architecture - David Vernon
[Pages:358]An Introduction to Computer Systems
David Vernon
Copyright ? 2007 David Vernon (vernon.eu)
A Computer ....
? takes input ? processes it according to stored instructions ? produces results as output
Copyright ? 2007 David Vernon (vernon.eu)
Key Concepts
? Input: Data ? Instructions: Software, Programs ? Output: Information (numbers, words,
sounds, images)
Copyright ? 2007 David Vernon (vernon.eu)
Types of Computer
Computer
Special Purpose (embedded systems)
Pre-programmed
General Purpose (user-programmable)
Can be adapted to many situations
W atches
Traffic Signals
Personal Computers
W orkstations
Engine Management
Televisions
Mainframes
Supercomputers
Telephones
Navigation Devices
Copyright ? 2007 David Vernon (vernon.eu)
Data vs Information
?A
? 2, 4, 23, 30, 31, 36
?A
? your grade in the exam
? 2, 4, 23, 30, 31, 36
? Next week's Lotto numbers
Copyright ? 2007 David Vernon (vernon.eu)
Key Concepts
? Codes
? Data and information can be represented as electrical signals (e.g. Morse code)
? A code is a set of symbols (such as dots and dashes in Morse code) that represents another set of symbols,
? such as the letters of the alphabet, ? or integers or real numbers, ? or light in an image, ? for the tone of a violin
Copyright ? 2007 David Vernon (vernon.eu)
Key Concepts
? A circuit is an inter-connected set of electronic components that perform a function
? Integrated Circuits (ICs)
? Combinations of thousands of circuits built on tiny pieces of silicon called chips
Copyright ? 2007 David Vernon (vernon.eu)
Key Concepts
? Binary signal (two state signal)
? Data with two states ? off & on ? low voltage & high voltage ? 0v & 5v
Copyright ? 2007 David Vernon (vernon.eu)
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