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Note that IBM PC and PC XT keyboards use a different unidirectional protocol with the same DIN connector as AT keyboards, so though a PC or XT keyboard can be connected to PS/2 port using a wiring adapter intended for an AT keyboard, the earlier keyboard will not work with the PS/2 port. (At least, it cannot work with normal PS/2 keyboard ...
The PS/2 interface uses 5V CMOS logic levels, whereas the USB data lines work at a much lower voltage level (however, they are 5V safe as well). PS/2-USB-adapters do not contain any electronics, they are passive adapters using a "tricky" wiring allowing the keyboard to detect if it is connected to a PS/2 port or not.
PS/2 did not typically support plug-and-play, which means that connecting a PS/2 keyboard or mouse with the computer powered on does not always work and may pose a hazard to the computer's motherboard. Likewise, the PS/2 standard did not support the HID protocol. The USB human interface device class describes a USB HID.
The original IBM PS/2 mouse PS/2 connection ports (later colored purple for keyboard and green for mouse, according to PC 97) were once commonly used for connecting input devices. PS/2 systems introduced a new specification for the keyboard and mouse interfaces, which are still in use today (though increasingly supplanted by USB devices) and ...
To use the computer, one places the computer on a desk and opens the latches at either side of the front of the computer to release the keyboard, which swings down. The keyboard can then be fully released from the main unit and height adjusted for comfort. The screen viewing angle can also be adjusted by pulling on tabs on either side of the ...
This layout was more efficient for touch typists but was superseded in the marketplace by that with F-keys along the top. PS/2 released April 1987. There are different versions of the Enhanced keyboard layout: 101 standard US layout double-width Return key (spanning C12 and C13) with a 1.5-width key at D13
An official PlayStation 2 USB keyboard and mouse came bundled as part of the Linux for PlayStation 2 kit, which turns any original model PS2 into a Linux computer. Any other standard USB keyboard and mouse will also work. In addition to the Linux kit, there were a handful of games that used a keyboard and mouse or just a mouse or trackball.
PC keyboards since the PS/2 keyboard support up to three scancode sets. The most commonly encountered are the "XT" ("set 1") scancodes, based on the 83-key keyboard used by the IBM PC XT and earlier. These mostly consist of a single byte; the low 7 bits identify the key, and the most significant bit is clear for a key press or set for a key ...