lec3 - COMP 273 Introduction to Computer Systems COMP 273...

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COMP 273 Introduction to Computer Systems COMP 273 Digital Logic (Part 1) Information Representation in Today’s Computers Prof. Joseph Vybihal
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2 COMP 273 Introduction to Computer Systems Announcements Ass#1 this week 5 profs + Doina Precup http://www.mcgill.ca/science/ours/soupscience
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COMP 273 Introduction to Computer Systems Learn about cutting-edge research over lunch with cool profs September 14 - 18, 2009 11:30 AM Redpath Museum More info + schedule: www.mcgill.ca/science/
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4 COMP 273 Introduction to Computer Systems Question Light bulbs Metal bar, punch cards Lasered pot marks Bubbles Solid glass cube Etc… In how many ways can we represent information physically in some imaginary computer? For each representation technique, how can we represent data structures like the letter A and a String? How would we address it?
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COMP 273 Introduction to Computer Systems Part 1 Number Representations
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6 COMP 273 Introduction to Computer Systems Fundamental Unit of Data The Bit Binary Value: 0 and 1 Physical representation: 2-5V is 1 0-1V is 0 Used to represent: 1/0 T/F On/Off Yes/No Flags and Switches (status information / turn on or off message) Space provided for fluctuations in current
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7 COMP 273 Introduction to Computer Systems Bit Groupings (1/2) Used to code information Nibble: 4 bits Byte: 8 bits Word: 16 bits Long Word: 32 bits (or just Word) Quad Word: 64 bits (or just Word) Primary addressable unit for PC Note: the address size itself may be different.
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COMP 273 Introduction to Computer Systems About WORDS Modern definition of a Byte: The smallest number of bits assembled into a unit that can be addressed by a single number in RAM. Modern definition of a Word: The “common” “size” of a register within the CPU. Where size refers to the number of bits, and Common refers to the register size the CPU was designed best to function with. (CPUs often have multiple registers sizes)
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This note was uploaded on 11/05/2009 for the course COMP 273 taught by Professor Vybihal during the Spring '09 term at McGill.

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lec3 - COMP 273 Introduction to Computer Systems COMP 273...

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