Back Panel of Desktop PC :

1. PS/2 (Power Series/2) Port :

• Power Series /2 ports are developed by IBM.
• There are two types of PS/2 ports in the computer.
• In PS/2 purple color port is used for the keyboard.
• PS/2 Light green color port is used for the mouse.
• PS/2 is old standard and nowadays it is replaced by USB ports.

Note :

If you change the PS/2 KB/Mouse of the running system, you must restart your PC to work with this device.

2. USB PORT - Universal Serial Bus :

• USB 2.0 : Hi-Speed: A significant improvement over 1.x, offering higher data transfer speeds (480 Mbps). Million bits per second
• USB 3.x : USB 3.0 (USB 3.2 Gen 1): Introduced SuperSpeed data transfer (5 Gbps) and bi-directional data transfer.
• USB 3.1 : Further increased SuperSpeed+ data transfer speeds (10 Gbps).
• USB 3.2 : Enhanced speed with (20 Gbps) transfer.

USB version symbols

3. Video Graphics Array (VGA) :

• It is having 15 pins
• Used to connect your pc or laptop to Monitor/Projector

• 15 pins - cable carry only video signal
• Only for standard quality pictures

4. HDMI - High Definition Multimedia Interface :

• HDMI is 2 in 1 - Carry video signal and Audio signal
• HDMI is using 19 pins to transfer video + audio
• It transfers HD video + HD Audio to your monitor
• Maximum HDTV use HDMI connector
• You will get the best Picture and Sound quality using HDMI

5. Serial COM Ports :

• 9 pin serial port for mouse or modem
• This was common in early days computers
• Two types COM1 and COM2 9 pin DB-9 and 25 pin DB-25

6. Parallel Port :

It is 25 pin parallel port used for the old printers

7. Ethernet Port/Lan Port :

• Each PC has internal Lan card
• RJ-45 connector - Registered Jack Lan port for Ethernet lan
• Speed 100Mbps /1000Mbps [1Gbps]

8. Audio Ports :

• There are at least three 3.5mm sound ports on PCs.
• Typically they are available in the colors of Green, Blue, and Pink.
• Different audio port colors show their different functions.
• Green is designed for audio output, Blue is for line-in, and Pink is for microphone input.

Data Movement:Input Devices :

Keyboard, Mouse, Joystick, Webcam, Biometric devices, Touchpad, Scanner - Barcode and Pages scanners