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The PS/2 mouse connector generally replaced the older DE-9 RS-232 "serial mouse" connector, while the PS/2 keyboard connector replaced the larger 5-pin/180° DIN connector used in the IBM PC/AT design. The PS/2 keyboard port is electrically and logically identical to the IBM AT keyboard port, differing only in the type of electrical connector used.
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.
The PC 97 standard requires that a computer's BIOS must detect and work with USB HID class keyboards that are designed to be used during the boot process. Some keyboards implement the USB Boot Keyboard profile specified in the USB Device Class Definition for Human Interface Devices (HID) v1.11 and are explicitly configured to use the boot protocol.
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.
Note: Version 8.0 and above dropped PS/2 support for the following list. As even adapters can't assist, [clarification needed] Microsoft keeps version 7.1 as an offered download for users who still own keyboards with PS/2 connectors (instead of USB).
A more upscale offering, the RSX offers a 25 MHz 80386SX processor, 1 MB RAM, two 16-bit ISA slots, AcuMos SVGA video, a bidirectional parallel port, and standard PS/2 keyboard and mouse ports. It is a full 386-class PC and can run Microsoft Windows 3.x.
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 ...
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.