Here's a video about how computer works?
What is Motherboard?
Motherboard is the main circuit board or central printed circuit board of a computer,it contains the CPU,memory, hard disk drive and also it is where the keyboard, mouse, speaker,printer and other auxiliary devices are connected.
Other names for motherboard: mainboard, system board, logic board (apple computers),planar board and mobo.
Parts of Motherboard
(Motherboard manufacturer's name: ECS 945GCT-HM
HP/Compaq name: Livermore-GL6)
Figure 1: Photograph
Figure 2: Backplate
1 - PS/2 mouse port (green). This port is for a PS/2 mouse.
2 - LAN (RJ-45) port. This port allows connection to a Local Area Network (LAN) through a network hub.
3 - Line In port (light blue). This port connects a tape, CD, DVD player, or other audio sources, or it can function as Rear Speakers out.
4 - Line Out port (lime). This port connects to headphones or a speaker, or it can function as Front Speakers Out.
5 - Microphone port (pink). This port connects a microphone, or it can function as Center/Subwoofer Speaker.
6 - USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB 2.0 devices.
7 - Video Graphics Adapter port. This port is for a VGA monitor or other VGA-compatible devices.
8 - PS/2 keyboard port (purple). This port is for a PS/2 keyboard.
Read more about motherboards.
Motherboard
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