Functions Of Ports And Slots

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H = height of slot port w = width of slot port d = diameter of equivalent round port so to compute the 'diameter' of the port as a function of the slot height and width i would use: (using the + obviously) This makes sense to me because given any port length L, the total volume of the port will be the same. Memory per slot 2 GB, 4 GB, and 8 GB Configurations supported. 4 GB DDR4 at 2133 MHz (4 GB x 1). 6 GB DDR4 at 2133 MHz (4 GB + 2 GB). 8 GB DDR4 at 2133 MHz (4 GB + 4 GB or 8 GB x 1) Ports and connectors Table 6. Ports and connectors specifications External: Network One RJ45 port USB. Two USB 2.0 ports. One USB 3.0 port Audio/Video.

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USB ports come in an array shapes, though the most common are USB-A and USB-C. USB-A is the non-reversible, oblong connector with right-angle corners, while USB-C is the newer, reversible.

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A port is a physical docking point using which an external device can be connected to the computer. It can also be programmatic docking point through which information flows from a program to the computer or over the Internet.

Characteristics of Ports

A port has the following characteristics −

  • External devices are connected to a computer using cables and ports.

  • Ports are slots on the motherboard into which a cable of external device is plugged in.

  • Examples of external devices attached via ports are the mouse, keyboard, monitor, microphone, speakers, etc.

Let us now discuss a few important types of ports −

Serial Port

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  • Used for external modems and older computer mouse

  • Two versions: 9 pin, 25 pin model

  • Data travels at 115 kilobits per second

Parallel Port

  • Used for scanners and printers

  • Also called printer port

  • 25 pin model

  • IEEE 1284-compliant Centronics port

PS/2 Port

  • Used for old computer keyboard and mouse

  • Also called mouse port

  • Most of the old computers provide two PS/2 port, each for the mouse and keyboard

  • IEEE 1284-compliant Centronics port

Universal Serial Bus (or USB) Port

  • It can connect all kinds of external USB devices such as external hard disk, printer, scanner, mouse, keyboard, etc.

  • It was introduced in 1997.

  • Most of the computers provide two USB ports as minimum.

  • Data travels at 12 megabits per seconds.

  • USB compliant devices can get power from a USB port.

VGA Port

  • Connects monitor to a computer's video card.

  • It has 15 holes.

  • Similar to the serial port connector. However, serial port connector has pins, VGA port has holes.

Power Connector

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  • Three-pronged plug.

  • Connects to the computer's power cable that plugs into a power bar or wall socket.

Firewire Port

  • Transfers large amount of data at very fast speed.

  • Connects camcorders and video equipment to the computer.

  • Data travels at 400 to 800 megabits per seconds.

  • Invented by Apple.

  • It has three variants: 4-Pin FireWire 400 connector, 6-Pin FireWire 400 connector, and 9-Pin FireWire 800 connector.

Modem Port

  • Connects a PC's modem to the telephone network.

Ethernet Port

  • Connects to a network and high speed Internet.

  • Connects the network cable to a computer.

  • This port resides on an Ethernet Card.

  • Data travels at 10 megabits to 1000 megabits per seconds depending upon the network bandwidth.

Game Port

  • Connect a joystick to a PC

  • Now replaced by USB

Digital Video Interface, DVI port

  • Connects Flat panel LCD monitor to the computer's high-end video graphic cards.

  • Very popular among video card manufacturers.

Sockets

  • Sockets connect the microphone and speakers to the sound card of the computer.

Alternatively known as a bus slot or expansion port, an expansion slot is a connection or port inside a computer on the motherboard or riser card. It provides an installation point for a hardware expansion card to be connected. For example, if you wanted to install a new video card in the computer, you'd purchase a video expansion card and install that card into the compatible expansion slot.

Computer expansion slots

Below is a listing of expansion slots commonly found in a computer and the devices associated with those slots. Clicking on any of the links below provide you with additional details.

Functions
  • AGP - Video card.
  • AMR - Modem, sound card.
  • CNR - Modem, network card, sound card.
  • EISA - SCSI, network card, video card.
  • ISA - Network card, sound card, video card.
  • PCI - Network card, SCSI, sound card, video card.
  • PCI Express - Video card, modem, sound card, network card.
  • VESA - Video card.

Many of the above expansion card slots are obsolete. You're most likely only going to encounter AGP, PCI, and PCI Express when working with computers today. In the picture below is an example of what expansion slots may look like on a motherboard. In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP.

How many expansion slots does my computer have?

Every computer motherboard is different, to determine how many expansion slots are on your computer motherboard identify the manufacturer and model of the motherboard. Once you've identified the model of motherboard, you can find complete information about the motherboard in its manual.

Adding additional expansion slots for older motherboards could be accomplished by using a riser board, which would add several ISA or PCI slots. Today, riser boards are rarely used with motherboards, as there is limited need for additional expansion slots with modern motherboards.

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What type of expansion slots are on my motherboard?

As mentioned above, every motherboard model is unique, so to determine the type of expansion slots on the motherboard, consult the board's specifications and owner's manual. You can also open the computer case and visually examine the motherboard.

Why do computers have expansion slots?

Computers have expansion slots to give the user the ability to add new devices to their computer. For example, a computer gamer may upgrade their video card to get better performance in their games. An expansion slot allows them to remove the old video card and add a new video card without replacing the motherboard.

What is the most common expansion slot today?

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Today, the most commonly used expansion slot used and found on computer motherboards is the PCI Express expansion slot.

Does a laptop have an expansion slot?

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Laptops do not have expansion slots like a desktop computer. However, some laptops do have PC Cards that can be inserted into the side of the laptop. They may also have a Cardbus slot for an ExpressCard to be added.

Related expansion slot pages

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Expansion, Expansion card, Motherboard terms, Seated