07_090911_Chpt04 - Chapter 4 Hardware and Software MIS 301...

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MIS 301 Introduction to IT Management Lizhen Xu IROM Department McCombs School of Business Chapter 4 Hardware and Software
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Chapter 4 Learning Objectives Computer hardware Client vs. Server Software Viruses, Trojan horses, and worms
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Hardware categorized by primary function
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Processing devices Central processing unit (CPU) selects instructions, processes them, performs arithmetic and logical comparisons & stores operations in memory
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Processing devices Main memory Also called RAM (Random access memory) To store data or instructions, RAM needs power RAM volatile - when power shut off, RAM contents lost
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Processing devices Special function cards: Video card provide enhanced clarity & refresh speed for video display
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CPU and Memory Motherboard - circuit board on which processing components are mounted and/or connected Central processing unit (CPU) - reads instructions and data from main memory, writes data to main memory via data channel, or bus Main memory set of cells; each holds a byte of data or instruction Each cell has address; CPU uses addresses to identify data items
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CPU Von Neumann Architecture In Memory: No distinction between data and instructions ALU: Arithmetic Calculation Logic Calculation Control Unit: Read instructions from memory CPU: combine ALU and Control Unit CPU read from/write into memory through Bus
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What is the CPU & Memory of your laptop? Intel Core Duo T2050 Frequency: 1.6GHz Bus Speed: 533MHz Data Width: 32 bit L1 Cache Size: 32KB (instructions) 32KB (data) L2 Cache Size: 2MB (shared) Cache Speed: 1.6GHz Kingston PC5300 DDR2 Memory Size: 1GB Memory Speed: 667MHz
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CPU at Work CPU has clock speed, measured in cycles per second, or hertz Fast computer clock speed 3.0 gigahertz (GHz), or 3 billion cycles per second By time you read this, CPU speeds greater In general, faster clock speed = faster work
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CPU at Work CPU reads instructions and data from memory via data bus Maximum data transfer speed determined by speed of main memory and speed and width of data bus 16 bits wide bus can carry 16 bits at a time; 64 bits wide bus can carry 64 bits Wider bus can carry more data in given time Bus speed has become a chief bottleneck of Modern PCs.
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This note was uploaded on 12/17/2010 for the course MIS 03765 taught by Professor Xu during the Fall '09 term at University of Texas.

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07_090911_Chpt04 - Chapter 4 Hardware and Software MIS 301...

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