Bus mouse

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Bus mouse
ISA mouse adapter.JPG
A Microsoft InPort bus mouse adapter, in the form of an 8-bit ISA (XT-bus) card.
Type Computer mouse input port
Designer Microsoft
Designed late 1980s
Produced 1980s to 2000
Superseded by PS/2 connector, USB (2000)
External Yes
Pins 9
Data signal 3 button state signals and quadrature signals for mouse movement
Pin 1 SW 2 Mouse button 2
Pin 2 SW 3 Mouse button 3
Pin 3 GND Ground
Pin 4 XB X position
Pin 5 YA Y position
Pin 6 YB Y position
Pin 7 SW1 Mouse button 1
Pin 8 +5 V Power
Pin 9 XA X position
XA/XB and YA/YB indicate movement and direction based on quadrature phase.

A bus mouse is a variety of PC computer mouse which is attached to the computer using a specialized interface (originally, the Microsoft InPort interface developed for Microsoft's original mouse product).

In the late 1980s, mice were not integrated with IBM-compatible personal computers, and the specialized bus interface (implemented via an ISA add-in card) was one of two popular ways to connect a mouse. (Serial interfaces, common on engineering workstations, were the other method.) When the IBM PS/2 was introduced, it included a motherboard mouse interface which was integrated with the keyboard controller (still called the PS/2 mouse interface long after the PS/2 brand was withdrawn); this fairly quickly drove the bus mouse design out of the marketplace.

The bus mouse lived on in the NEC PC-98 family of personal computers in Japan.

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