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Professor Michael J. Losacco CIS 1150 – Introduction to Computer Information Systems The System Unit Chapter 5.

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Presentation on theme: "Professor Michael J. Losacco CIS 1150 – Introduction to Computer Information Systems The System Unit Chapter 5."— Presentation transcript:

1 Professor Michael J. Losacco CIS 1150 – Introduction to Computer Information Systems The System Unit Chapter 5

2 Chapter5 2/20 Overview Discuss the Types of System Units Describe System Boards Discuss Processors Discuss Memory Discuss Expansion Slots and Cards Bus Lines, Bus Widths, Expansion Buses Describe Ports Discuss Power Supplies Discuss Numbers and Characters 2

3 Chapter5 3/20 System Unit Types Desktops Tower Unit All-in-one Notebooks Laptops Netbooks Tablets Handhelds 3

4 Chapter5 4/20 System Board AKA Motherboard All Components Connect to It All External Devices Connect to It Acts as Data Path and Traffic Monitor Provides Sockets Connection Point For Chips 4

5 Chapter5 5/20 System Board Components Chips AKA Semiconductor, Integrated Circuit Tiny Circuit Boards on Silicon Squares Mounted on Carrier Packages Slots Connection Points for Circuit Boards Provide Expansion Capability Bus Lines Communication Pathways for Components 5

6 Chapter5 6/20 Microprocessor AKA Central Processing Unit or Processor Brain of the Computer System Components Control Unit Directs Movement of Electronic Signals Between Memory, ALU, Input and Output Devices Arithmetic-logic Unit (ALU) Arithmetic and Logical Operations 6

7 Chapter5 7/20 Microprocessor Chips Chip Capacities Expressed in Word Size Word Number of Bits Processed at a Time 64-bit Word Standard Clock Speed Processing Speed Times Per Second CPU Processes Data 7

8 Chapter5 8/20 Microprocessor Chips System Clock Processor Speed Measured by Ticks/Second MHz – One Million Ticks/Second Type 100 Words/Minute = 8 Characters/Second MHz Character ► 50,000 Other Tasks ► Character GHz – One Billion Ticks per Second

9 Chapter5 9/20 Microprocessor Chips Multi-Core Chip Multiple Separate and Independent CPUs Parallel Processing Divide Tasks that can be Distributed Across Each Core Supported by Windows 8 and Mac OS X Coprocessors Used to Improve Specific Operations e.g., Graphics Processing Unit (GPU) 9

10 Chapter5 10/20 Memory Holding Area For Data, Instructions, and Information RAM (Random-access Memory) Volatile Holds Program Instructions and Data That CPU is Presently Processing

11 Chapter5 11/20 Memory Sizes

12 Chapter5 12/20 Memory Cache Memory Temporary High-speed Holding Area Between Memory and CPU Stores Most Frequently Used Data ROM (Read-only Memory) Non-volatile, Cannot be Updated Flash Memory Non-volatile, Can be Updated

13 Chapter5 13/20 Expansion Slots and Cards Allow for System Expansion Graphics Cards Sound Cards Network Interface Cards (NIC) Wireless Network Cards Plug and Play ExpressCard

14 Chapter5 14/20 Bus Lines Pathway for Bits Travel to/from CPU and Components Bus Width Number of Bits that Can Travel at Once Categories System Bus Expansion Bus

15 Chapter5 15/20 Ports Sockets for External Devices Connects to System Board or Cards Standard Ports VGA, USB, Firewire, Ethernet Cables

16 Chapter5 16/20 Power Supply Convert AC to DC Power System Unit Components AC Adapters Notebooks and Handhelds Can Recharge Batteries

17 Chapter5 17/20 Electronic Data and Instructions Analog Signals Represent Different Tones, Pitches, Volume Digital Electronic Signals Represent Two Discrete States On / Off Recognized By Computers Binary is the Equivalent Numbering System

18 Chapter5 18/20 Numeric Representation Binary System Bit (Binary Digit) 2 Possible Digits On = 1; Positive Charge Off = 0; No Charge Byte Eight Bits Grouped Together Represent Letters, Numbers, Punctuation Hexadecimal System 16 Possible Digits

19 Chapter5 19/20 Character Encoding ASCII American Standard Code for Information Interchange Microcomputers EBCDIC Extended Binary Coded Decimal Interchange Code Mainframe Unicode Uses 16 bits

20 Chapter5 20/20 Careers in IT Computer Technicians Repair and Install Components and Systems Work On PCs, Mainframes, Networks, Printers Associate Degree or Computer Repair Cert Annual Salary of $31,000 - $46,000


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