What is a Computer?
A computer is an electronic device that manipulates information, or data. It has the ability to store, retrieve, and process data. You may already know that you can use a computer to type documents, send email, play games, and browse the Web. You can also use it to edit or create spreadsheets, presentations, and even videos.
The monitor receives video signals from the computer video adapter card and displays the video information as pixels (picture elements) on the monitor screen. A variety of monitors ranging from CGA mono to SVGA colour are available for users to choose from (though the former is totally obsolete).
Center Unit Processors
CPU is the brain of any computer. It controls all activities inside the computer. Basically it performs 2 types of operations - arithmetic & logical operation (internally), operations are performed on 2 types of devices - I/O and memory devices. It uses the “address bus” to select any “location” on these devices, sends a read/write signal over the “control bus” and then the information over the “data bus”.
Keyboard translates the keystrokes into letters or numbers. These letters are interpreted and the computer CPU depending executes commands on what was sent. Variations in terms of XT/AT, no. of keys, type of keys used may be observed.
To interact with the pictures (ICONS), a special pointer device was introduced into the computer world. This device is known as mouse and is connected to the serial port/USB.
The mouse contains a round ball that makes contact with two rollers-one for X-axis (the horizontal) and one for Y-axis (the vertical).
With the optical sensor and blue-tooth technology,the mouse can be use without wire-wireless mouse.
The mouse pointer moves erratically, what is the possible cause? The mouse
- ball is dirty
- driver is not installed properly
Most PCs give a single beep on boot up to indicate they are OK hardware wise. You boot your PC and don't get a beep. What should you check first?
- system board