Outline and Objective轮廓与目的.pptVIP

Lecture 1 _ Introduction Introduction EYAD ALSHAREEF Outline and Objective Introduction to Computers Understanding the window layout Introduction to Visual Basic What is a Computer? Device Computations : addition, multiplication Making Logical Decisions : comparisons Very High Speed : millions faster than human beings Computer Organization Hardware: Electronic Devices Circuits Software: Instructions or Computer Programs Six logical units of computer Input unit “Receiving” section Obtains information from input devices Keyboard, mouse, microphone, scanner, networks, … Output unit “Shipping” section Takes information processed by computer Places information on output devices Screen, printer, networks, … Information used to control other devices Six logical units of computer Memory unit Rapid access, relatively low capacity “warehouse” section Retains information from input unit Immediately available for processing Retains processed information Until placed on output devices Memory, primary memory Arithmetic and logic unit (ALU) “Manufacturing” section Performs arithmetic calculations and logic decisions Six logical units of computer Central processing unit (CPU) “Administrative” section Supervises and coordinates other sections of computer Secondary storage unit Long-term, high-capacity “warehouse” section Storage Inactive programs or data Secondary storage devices Disks Longer to access than primary memory Less expensive per unit than primary memory Control Unit (CU) Directs the order in which commands are executed. Communicates with input and output devices. Transfers data to and from the primary storage unit and various input and output devices. Memory Memory is a Temporary Storage Types of Memory Random Access Memory (RAM) Read Only Memory (ROM) Random Access Memory(RAM) Stores program instructions and data needed for processing. Stores intermediate and final results of processing. It is volatile. Software Instructions for the hardware. A collect