Expansion slot examples, several compact expansion...

In the PC-compatible personal computer, these connectors were located in the support bracket at the back of the cabinet.

Slot location

The first company to establish a de facto standard was the Altairdevelopedwhich later became a multi-manufacturer standard, the S bus. How do I find what computer motherboard I have? Daughterboards are also sometimes used to expand the basic functionality of an electronic device, such as when a certain model has features added to it and is released as a new or separate model.

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Even many video game consoles, such as the Sega Genesisincluded expansion buses; at least in the case of the Genesis, the expansion bus was proprietary, and in fact the cartridge slots of many cartridge based consoles not including the Atari would qualify as expansion buses, as they exposed both read and write capabilities of the system's internal bus.

Once you've identified the model of motherboard, you can find complete information about the motherboard in its manual. Examples of daughterboard-style expansion cards include: This standard, approved[ Like whom? Every computer motherboard is different, and the only way to determine how many expansion slots are on your computer motherboard is to identify the manufacturer and model of the motherboard.

Expansion card example

What is the most common expansion slot today? What type of expansion slots are on my motherboard? Since reliable multi-pin connectors are relatively costly, some mass-market systems such as home computers had no expansion slots and instead used a card- edge connector at the edge of the main board, putting the costly matching socket into the cost of the peripheral device.

In the case of expansion of on-board capability, a motherboard may provide a single serial RS port or Ethernet port. Proprietary local buses q. The Amiga used Zorro II.

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Rather than redesigning the first model completely, a daughterboard may be added to a special connector on the main board. Applications[ edit ] The primary purpose of an expansion card is to provide or expand on features not offered by the motherboard. Cardbus is being supplanted by ExpressCard format. Adding additional expansion slots for older motherboards could be accomplished by using a riser boardwhich would add several ISA or PCI slots.

Computer expansion slots

In this case, the motherboard provides basic functionality but the expansion card offers additional or enhanced ports. Intel introduced the AGP bus in as a dedicated video acceleration solution. Computers have expansion slots to give the user the ability to add new devices to their computer.

Why do computers have expansion slots?

Daughterboards are sometimes used in computers in order to allow for expansion cards to fit parallel to the motherboard, usually to maintain a small form factor. Peripheral expansion cards generally have connectors for external cables.


In this picture, there are three different types of expansion slots: Again, PCjr sidecars are not technically expansion cards, but expansion modules, with the only difference being that the sidecar is an expansion card enclosed in a plastic box with holes exposing the connectors. Laptops do not have expansion slots like a desktop computer. Minicomputers, starting with the PDP-8were made of multiple cards, all powered by and communicating through a passive backplane.

Depending on the form factor of the motherboard and casearound one to seven expansion cards can be added to a computer system.

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Daughterboards often have only internal connections within a computer or other electronic devices, and usually access the motherboard directly rather than through a computer bus. The PCI standard supports bus bridging: Several compact expansion standards were developed.

When many expansion cards are added to a system, total power consumption and heat dissipation become limiting factors. Because it is electrically compatible with the XT bus a. Other families[ edit ] Most other computer lines, including those from Apple Inc.

How many expansion slots does my computer have?

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In that case, a graphics card and an ST hard disk controller card provided graphics capability and hard drive interface respectively. An expansion slot allows them to remove the old video card and add a new video card without having to replace the motherboard.

At that time, the technology was called the PC bus. For example, many graphics cards on the market as of are dual slot graphics cards, using the second slot as a place to put an active heat sink with a fan.

Wavetable cards sample-based synthesis cards are often mounted on sound cards in this manner.