Computer systems use various ports to connect peripheral devices. Ports are located on both the front and rear of the computer. Serial ports transfer data one bit at a time and are used to connect modems, while parallel ports transfer multiple bits at a time and connect printers and hard disks. Video ports like VGA, DVI, HDMI connect monitors. PS/2 ports connect keyboards and mice, Ethernet ports connect the computer to a network, and audio ports input and output sound. Additional ports include eSATA for external hard disks and USB ports which can replace serial, parallel and PS/2 ports to connect various peripherals using a single standard.

1. Computer Systems
Ports

2. System Devices
• Interface or point of attachments.
• Connect peripheral devices with computer
Ports at the rear of the computer
Ports at the front of the computer
Ports

3. System Devices
• 9-pin port.
• Transfer one bit at a time
(Kbps)
• Connect External modems
• 25-pin port
• Transfer many bit at a time (Mbps)
• Connect printers, external hard disks etc.
Serial port -
Parallel port -

4. System Devices
used to connect a monitor to the computer system.
• VGA port -
→ Connect CRT
• DVI (Digital Visual Interface) port -
→ Connect LCD
• HDMI (High-Definition Multimedia Interface) port –
• Connect LED
Video port -

5. System Devices
PS/2 port -
•Used to connect keyboards and mouse to the computer.
•Keyboard - purple
•Mouse - green
Ethernet port -
•Used to connect a computer to a network.
•Known as RJ45
•Transfer rate (Gbps)

6. System Devices
•Used to input and output audio from the computer.
• Light blue - Connect external devices
• Lime - Connect speakers
• Pink - Connect a microphone.
Audio ports -

7. System Devices
eSATA: (external Serial Advanced Technology Attachment)
•Connect external hard disk
•Fast transmission speed

8. System Devices
•Intended to replace Serial, Parallel & PS/2 ports with a
single standard.
•Connect Usb & other peripheral devices.
USB port -