(Input Unit)Is the unit receiving data from the user into the main memory is divided into various categories as follows: (Keyed Device) (Keyboard)Info is the most popular because it is standard equipment in the Terminal for input and microcomputer. In General, it looks like the keys of a typewriter, but has a number of keys and is divided into 4 different groups: (Character Keys) will look to place letters like typewriter keys. (Control Keys) is a key that is responsible for some of the command by using in conjunction with another key. (Function Keys) is on the top row of keys are F1, F2, ..., F12. Each type of software may assign these keys provide the page visitor (Numeric Keys) as a separate character from keyboard keys on the right. Looks like a calculator. Facilitate their record numbers into the computer. (Pointing Devices) (Mouse)The mouse has many different characteristics, size, but the size will be used by the components of the hand. With the ball rolling round the bottom, or a light system. The upper part contains a button, press the number two. Three or four buttons, move the mouse to the ones below rotate. To move the pointer (Cursor) on the monitor to the desired location on the screen. Control (Click) (Double Click) (Right Click) (Drag and Drop) (Track ball), (Track Point), (Touch pad)All three of these devices are often found in portable computers to act instead of the mouse. Because it can stick to the machine at all. Make it portable and convenient to use space to work less than the mouse. All three devices have different characteristics: Round ball control is a small ball, which may be placed on the screen and keyboard space, or as a separate device like a mouse. When the user rotates the ball just moves the position of the pointer position on the screen. Work, as well as the mouse. A bone point control is a small plastic stick in the middle of the keyboard by using the thumb to move the position of the pointer position on the screen, as well as the mouse. The touch pad is a rectangle that is placed in front of the keyboard. Drawing a finger can be used to move the position of the pointer position on the screen, as well as the mouse. (Joy Stick)Joystick is rocking for shaft and up and down/left right to move the position of the pointer position on the screen. Work like a mouse, but there will be additional keystrokes from a number of special command is used to play computer games or to control the robot. (Touch-Sensitive Screen) (Touch Screen)As a special monitor which users simply tap a finger on the screen in place. To select the required function instead of using the Mouse or Keyboard software that is used to find out if the user selects options and work accordingly. This principle is used with a micro computer to allow the user the computer not fluent students can choose the information you want fast. It was heavily used in restaurant or quick provide tourist information, etc. (Pen-Based System) (Light pen)Use a Photoelectric cells which are sensitive to light and determines the position on the screen, use the drawing style or format of the data to appear on the screen. Implementation is done by tapping the pen light onto the screen, according to where you want to use with computer-assisted design (Computer Aided Design or CAD) as well as commonly used as input device by writing by hand in a small computer, PDA, etc. (Digitizing tablet)Consists of a lined piece of paper split (Grid), which can use only the pen called the Stylus points to the location to send information on a sheet of paper into the computer appear as streaks on the screen is a type of device used with the CAD, such as used in designing a new model car. Building a building. Medical devices and robots, etc. (Data Scanning Devices)Is the equipment used (Optical recognition systems), which help with the smallest data type? This type of device will read the data into a computer. The saengkwat terrain through text or symbols is to distinguish the following formats. There are currently applying for different jobs, there are very popular devices:(Magnetic Ink Character Recognition – MICR)ปัจจุบันมีจำนวนผู้นิยมใช้เช็คมากขึ้น จึงมีผู้คิดค้นวิธีการตรวจสอบเช็คให้รวดเร็วมีประสิทธิภาพ และเชื่อถือได้ โดยได้คิดประดิษฐ์เครื่อง MICR ขึ้นใช้ในธนาคารสำหรับตรวจสอบเช็ค เครื่องจะทำการเข้ารหัสธนาคาร รหัสสาขา เลขที่บัญชี และเลขที่เช็ค ไว้ในเช็คทุกใบ จากนั้นจึงส่งเช็คให้ลูกค้า ตัวเลขที่เข้ารหัสไว้จะเรียกว่า เลขเอ็มไอซีอาร์ (MICR number) ในเช็คทุกใบจะมีเลข MICR สีดำชัดเจนที่ด้านล่างซ้ายของเช็คเสมอ และหลังจากที่เช็คนั้นกลับมาสู่ธนาคารอีกครั้ง ก็จะทำการตรวจสอบจากเลข MICR ว่าเป็นเช็คของลูกค้าคนนั้นจริงหรือไม่ เครื่อง MICR ไม่เป็นที่นิยมใช้กับงานประเภทอื่น เพราะชุดของตัวอักษรที่เก็บได้มีสัญลักษณ์เพียง 14 ตัวเท่านั้นข้อดีของเครื่อง MICR คือมีมนุษย์เข้ามาเกี่ยวข้องน้อย ทำให้มีเปอร์เซ็นต์ความผิดพลาดต่ำมากรหัส MICR ที่ใช้สามารถอ่านได้ทั้งคน และเครื่อง MICRทำงานได้อย่างอัตโนมัติ รวดเร็วและเชื่อถือได้ (Bar Code Reader)Started in the year 1970 by the item ID is printed out in the form of black and white bars, continued. Called the EAN (Bar Code) and then will be able to use the barcode reader to read the information on the bar to retrieve the item's price. The number of remaining in warehouses, etc out of the database, and then performs the actual processing of data the list and continue the barcode standard used today contains the standard UPC (Universal Product Code) and Code 39 standard (Three of Nine) (Scanner)Is a device used to read (Scan) or the information on the document into the machine ...
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