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chap2 - Computer Science Department(CSD Centre for...

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FOSEE , MULTIMEDIA UNIVERSITY (436821-T) MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA. Tel 606 252 3594 Fax 606 231 8799 URL: http://fosee.mmu.edu.my/~csd/ Computer Science Department (CSD) Centre for Foundation Studies and Extension Education (FOSEE) PCA 0015 Computer Applications Foundation in Engineering ONLINE NOTES Chapter 2 Input and Output
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PCA0015 Computer Applications Chapter 2 Objectives: Upon completion of this topic, the students should be able to: Identify the different types of input/output devices Describe different mouse types and how they work Summarize how various pointing devices works Describe various input devices for PDAs, smart phones and Tablet PCs. Discuss various scanners and reading devices and how they work Summarize the various biometric devices Summarize the characteristics of LCD, LCD screens and plasma monitor Describe the characteristics of a CRT monitor and factors that affect its quality Describe various ways to print Differentiate between a non impact printer and an impact printer Describe the uses of speakers, headphones and earphones. 2.1 Input Any data or instructions you enter into the memory of a computer Data - a collection of unorganized facts that can consist of words, numbers, pictures, sounds and videos. This data is being processed into information. Instructions entered into the computer can be in the form of: Program - a series of instructions that tells a computer how to perform the tasks necessary to process data into information. Command - an instruction that causes a program to perform a specific action by typing or pressing keys on the keyboard or clicking a mouse button. User response - an instruction you issue to the computer by replying to a question posed by a computer program such as: Do you want to Exit this program? A response to the question instructs the program to perform certain actions. 2.1.1 Input Device Any hardware component that allows users to enter data and instruction into a computer. For Example: Type of Input Device Example Keyboard Input Keyboard Pointing Devices Mouse, Trackball, Joysticks, Touchpads, Light Pen, Digitizing tablet Source Data Entry Scanner, Optical Recognition, Voice Recognition, Audio and video input, Biometric device 2.1.2 Keyboard A keyboard is an input device that contains keys users press to enter data and instructions into a computer. There are several types of keyboard (based on the layout/ key position). CSD Lecturer 2/11
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PCA0015 Computer Applications Chapter 2 Most computers are using the QWERTY keyboard. This layout gets its name from the first six letters in the top-left row of alphabetic keys on the keyboard. The QWERTY layout was designed for typewriter and the letters are arranged to slow down the typist speed in order to prevent typewriter keys from jamming.
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