Input Devices: Mouse, Keyboard, and Alternatives
An input device is a tool to input data and commands into a computer. The two most common input devices are mice and keyboards, which can be connected through different types of ports. In addition, there are also wireless input devices that use the latest technology.
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1. Mouse and Keyboard Ports
Connector Type:
- PS/2: Round connector with 6 pins, used to connect the mouse and keyboard on older computers.
- USB (Universal Serial Bus): A more modern and commonly used connector today, supporting the connection of a mouse, keyboard, and a variety of other devices.
How to Distinguish Keyboard and Mouse Ports:
- PS/2: The keyboard ports are usually purple, while the mouse ports are green. This makes it easy for users to recognize the right port when connecting devices.
- USB: On the USB connector, there is no color difference between the keyboard and mouse ports; both can be connected to any USB port. However, some motherboards may have small labels near the ports to indicate their functionality.
2. Wireless Input Device
Infrared (IR):
Utilizes infrared light signals to send data between input and receiver devices. An example is a TV remote.
Excess:
- Uses little power, suitable for devices with small batteries.
- It is not affected by electromagnetic interference from other devices.
Deficiency:
- Requires a direct line of sight between the sender and receiver, making it less flexible.
- The range is limited, usually only a few meters.
Radio Frequency (RF):
Using radio waves to transmit data, is commonly used in modern wireless mice and keyboards.
Excess:
- It has a wider range than IR, usually up to 10 meters or more.
- It does not require a direct line of sight, allowing users to move freely while using the device.
Deficiency:
- Susceptible to interference from other devices that use the same radio frequency.
- Requires batteries to function, which need to be replaced or recharged periodically.
3. Other Input Devices: Trackballs, Touch Screens, Digital Tablets, and Signature Boards
In addition to mice and keyboards, various other input devices help users interact with the computer. Here is an explanation of some of these devices.
1. Trackball
A trackball is an input device that has a large ball that can be rotated by hand. Users can move the cursor on the screen by rotating this ball, while the tool stays in place.
Trackballs are often used in graphic design and CAD (Computer-Aided Design) applications because they provide more accurate control than a regular mouse.
Superiority:
- Reduced space requirements as it doesn’t need to be moved like a mouse.
- It can reduce the strain on the wrist, making it more comfortable for long-term use.
2. Touch Screen
A touchscreen is a screen that can respond to touch from the user. Users can perform various actions such as tapping, swiping, or pinching to zoom in on the view.
Generally used on smartphones, tablets, and information kiosks. The touchscreen allows for direct interaction with the user interface.
Superiority:
- Ease navigation and interaction, especially for graphics-based applications.
- Allows use without additional input devices such as keyboards or mice.
3. Digital Tablet
A digital tablet is a tool that allows users to draw or write directly on the surface of the tablet with a stylus or digital pen.
It is widely used by digital artists and graphic designers to create illustrations and designs with high accuracy.
Superiority:
- Provides a more natural drawing experience compared to a mouse.
- Many tablets have pressure sensitivity, so the thickness of the line can vary according to the pressure applied.