The PS/2 (Personal System/2) port is a small port for keyboards and mice on PC computers. It uses a 6-pin Hosiden connector, incorrectly referred to as "Mini-DIN".">

The PS/2 port - Everything you need to know !

Port PS/2 (Personal System/2)
Port PS/2 (Personal System/2)

The PS/2 port

The PS/2 (Personal System/2) port is a small port for keyboards and mice on PC computers. It uses a 6-pin Hosiden connector, incorrectly referred to as "Mini-DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
".


Of all the German standards patented DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
(Liste der DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
-Normen) and defined in accordance with the specifications of the "Deutschen Instituts für Normung" (German Institute for Standardization), no format with a diameter of 9.5 mm is referenced.

The manufacturer behind this miniaturized plug format is the Japanese company Hosiden, a manufacturer specializing in connectors, particularly video and computers, whose designation is often written or pronounced "Ushiden"; The confusion stems from the circular shape very similar to the DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
sockets with a diameter of 13.2 mm, originally intended for audio, which were very popular during the 1960s to 1980s, particularly in Europe. However, since the 90s, the name "Mini-DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
" still remains, instead of the reference to the Japanese manufacturer.

In 2023, the manufacturer's catalog can still include references for this format among the connectors it produces and markets.

Historical

It appeared with some game consoles produced in Japan, some IBM PS/2 computers and Apple Macintosh from 1986 onwards. However, the PS/2 port became widespread about ten years later, with the introduction of the ATX standard for motherboards in 1 9 9 5.
Previously, the keyboard had to be connected to a DIN
Circular DIN Audio/Video Connectors All male connectors (plugs) of this type have a circular outer metal frame with a diameter of 13.2 mm, with a keying that prevents connection in an incorrect orientation.
connector, while the mouse had to be connected to a serial port4; these two connectors have become obsolete with the generalization of the PS/2 port and USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
.

In 2013, most motherboards on the market still have PS/2 ports. Although many keyboards and mice now use the USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
port, they still make it possible not to occupy two USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
ports for the keyboard and mouse. For this purpose, it is sometimes possible to use a USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
to PS/2 adapter, or wireless keyboards and mice (Bluetooth technology).
Hosiden 6-pin female connector.
Hosiden 6-pin female connector.

Pinout

Hosiden 6-pin female connector.

Pinout of Hosiden connectors dedicated to PS/25.6 keyboards and mice :
Pin 1 Data red or green thread
Pin 2 Reserved Green Thread
Pin 3 0V (Baseline) White Thread
Pin 4 +5V Yellow thread
Pin 5 Clock Black Wire
Pin 6 Reserved blue thread

Precaution

It is strongly recommended not to "hot-plug" hardware to a PS/2 port.

It is also not recommended to plug the mouse into the keyboard port or vice versa. That's why the connectors on ATX motherboards (standard created in 1 9 9 5) and peripherals are color-coded : purple for the keyboard and green for the mouse. Before 1 9 9 5, the keyboard jack was in PS/1 format (like a PS/2 but large format) and the mouse was plugged into either the serial port or a dedicated port on the "video card" next to the VGA
VGA
This cable is used to connect a graphics card to an analog computer screen. The VGA connector consists of 15 pins arranged in three rows. This port is available in two generations : the original version and the DDC2 version, which allows automatic~type monitors.
Some laptops have a miniature version of this connector, the mini~VGA.
port.
The assembly of PCs was usually done by professionals.

Special case of Linux

In the event of a malfunction of the PS/2 keyboard port, the Linux operating system supports connecting and managing the keyboard on the PS/2 port, which is normally reserved for the mouse.

PS/2 and USB port : some more advantages

PS/2 is now considered a legacy port, with USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
ports now normally preferred for connecting keyboards and mice. This goes back to at least the 2000 Intel/Microsoft PC specification of 2000.

However, as of 2023, although PS/2 ports are rarely included in commercially available computer systems, they continue to be included on some computer motherboards and are favored by some users for a variety of reasons, including the following :

PS/2 ports may be preferred for security reasons in an enterprise environment because they allow USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
ports to be disabled entirely, preventing the connection of USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
removable disks and malicious USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
devices. [9]
The PS/2 interface offers no restriction on key toggling, although USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
keyboards also do not have such a restriction, unless they are used in BOOT mode, which is the exception.
To free up USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
ports for other uses like removable USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
devices.
Some USB
USB
The USB bus is also said to \Hot pluggable\, that is to say that you can connect and disconnect a USB with the PC on. The system installed on the PC (Windows, linux...) recognizes it immediately. The USB has a very interesting feature : it's the mode standby when not using the device. Also known as \Power conservation\ :
keyboards may not be able to run the BIOS on some motherboards due to driver issues or lack of support. The PS/2 interface has near-universal BIOS compatibility.

Color Coding

The original PS/2 connectors were black or had the same color as the connection cable (mostly white). Later, the PC 97 standard introduced a color code : the keyboard port and plugs of compatible keyboards were purple; The mouse ports and plugs were green.
(Some vendors initially used a different color code; Logitech used the color orange for the keyboard connector for a short time, but quickly switched to purple.) Today, this code is still used on most PCs.
The pinout of the connectors is the same, but most computers will not recognize the peripherals.
ColourFunctionConnector on PC
GreenPS/2 Mouse / Pointing Device 6 female Mini-DIN pins
VioletPS/2 KeyboardMini-DIN Female 6-pin


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