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Tutorials | Types of PC keyboards

Publish date: 23:33 Thursday, 15th September 2005
Written by: Murf
Audience intended for: Hardware
Category: Computer Hardware

Go up a levelGo up a level

The 3 basic types of KeyboardsTypes of PC keyboards

  1. Older computer's (XT, AT, Baby AT and LPX) use what is called an AT keyboard. This board has a large AT connector that plugs into the motherboard, commonalty referred to as a DIN-5 (IBM-PC). It looks like this:

    AT Keyboard

    The pins are as follows:

    Pin Description
    3Not connected (reset on some very old keyboards)
    5+5 VDC

  2. Newer keyboards use what is called an ATX keyboard. This board has either a USB or a PS/2 connector. The Ps/2 connector is smaller then the AT and communally referred to as PS2 (Mini-DIN-6). It looks like this:

    PS2 socket

    PS2 connection

    The pins are as follows:

    Pin Description
    4VCC (Power, +5 VDC)

    You can also get an adapter that will allow a PS/2 keyboard to plug into the old AT motherboard, it looks like this:

    AT to PS2 convertor

  3. And finally is the USB keyboard which has a standard USB plug on it:

    USB Cable


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