What is a PS/2 keyboard?
A PS/2 keyboard, also known as a Personal System/2 keyboard, is a type of computer keyboard that uses a PS/2 connector to connect to a computer. It was developed by IBM and introduced in the mid-1980s as a successor to the older AT (Advanced Technology) keyboard connection.
PS/2 keyboards are characterized by their round connector with six pins, which is usually color-coded as purple. These keyboards were widely used in personal computers until the late 1990s when USB (Universal Serial Bus) keyboards became more popular. Despite being mostly replaced by USB keyboards, PS/2 keyboards are still in use today, especially in older systems or specialized applications.
The PS/2 connector is a dedicated interface that only supports keyboard communication. It provides a reliable and low-latency connection between the keyboard and the computer. Unlike USB, which is a multi-purpose interface, the PS/2 connection does not require device drivers to operate and is recognized by the computer immediately when connected.
One advantage of PS/2 keyboards is their ability to support the simultaneous pressing of multiple keys, which is sometimes referred to as “n-key rollover.” This feature is particularly important for gamers and fast typists who may need to press multiple keys at once. USB keyboards, on the other hand, often have limitations in this regard.
Another advantage of PS/2 keyboards is their resistance to certain types of keyboard-based attacks, such as keyloggers. Since the PS/2 connection directly communicates with the computer’s keyboard controller, it is more difficult for malicious software to intercept keystrokes. However, modern computer security measures have mostly mitigated this advantage, and USB keyboards are considered secure for everyday use as well.
In conclusion, a PS/2 keyboard is a type of computer keyboard that uses a PS/2 connector to connect to a computer. Despite being older technology, it still offers advantages in terms of simultaneous keypresses and resistance to certain attacks. While USB keyboards have become more common, PS/2 keyboards are still used in various scenarios and can be a reliable input device for computer users.
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