 What Is a Computer? What Is a Computer?  Computer System Components Computer System Components  Hardware Hardware  Types of Memory Types of Memory  Input Devices Input Devices  Output Devices Output Devices  Overview of Software Overview of Software  Operating System Operating System

 A computer is a programmable machine with two principal characteristics: It responds to a specific set of instructions in a well-defined manner.  It can execute a prerecorded list of instructions (a program). back

Hardware Hardware refers to objects that you can actually touch, like disks, disk drives, display screens, keyboards, printers, boards, and chips.

 Instruction phase ◦ Step 1: Fetch instruction ◦ Step 2: Decode instruction  Execution phase ◦ Step 3: Execute the instruction ◦ Step 4: Store the results

K E Y B O S A R D back

 Random access memory (RAM) ◦ EDO RAM ◦ SDRAM ◦ DRAM  Read-only memory (ROM) ◦ PROM ◦ EPROM back

 Personal computer input devices  Voice-recognition devices  Digital computer cameras  Terminals  Scanning devices back

 Display Monitors  Liquid Crystal Displays (LCDs)  Printers and Plotters  Music Devices back

 Perform common computer hardware functions  Provide a user interface  Provide a degree of hardware independence  Manage system memory  Manage processing tasks  Provide networking capability  Control access to system resources  Manage files back

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