![]() ![]() ![]() The bidirectional IBM AT and PS/2 keyboard interface is a development of the unidirectional IBM PC keyboard interface, using the same signal lines but adding capability to send data back to the keyboard from the computer this explains the asymmetry. The channel is slightly asymmetrical: it favors transmission from the input device to the computer, which is the majority case. )Įach port implements a bidirectional synchronous serial channel. (That is, keyboard drivers are written to use the first port, and mouse drivers are written to use the second port. However, unlike the otherwise similar Apple Desktop Bus connector used by Apple, a given system's keyboard and mouse port may not be interchangeable since the two devices use different sets of commands and the device drivers generally are hard-coded to communicate with each device at the address of the port that is conventionally assigned to that device. The PS/2 platform introduced a second port with the same design as the keyboard port for use to connect a mouse thus the PS/2-style keyboard and mouse interfaces are electrically similar and employ the same communication protocol. 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. 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. Its name comes from the IBM Personal System/2 series of personal computers, with which it was introduced in 1987. The PS/2 port is a 6-pin mini-DIN connector used for connecting keyboards and mice to a PC compatible computer system. ^ Sometimes, mouse Clock for splitter cable.^ Sometimes, mouse Data for splitter cable.^ Keyboard and mouse ports may be combined into a single port which can be used to connect both by splitter cable. ![]()
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