Bus mouse
| Bus mouse | ||
|---|---|---|
|
|
||
| Type | Computer mouse input port | |
| Production history | ||
| Designer | Microsoft | |
| Designed | late 1980s | |
| Produced | 1980s to 2000 | |
| Superseded | DE-9 connector | |
| Superseded by | PS/2 connector, USB (2000) | |
| Specifications | ||
| External | Yes | |
| Data signal | 3 button state signals and quadrature signals for mouse movement | |
| Pins | 9 | |
| Pin out | ||
| 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 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which was integrated with the keyboard controller (still called the PS/2 mouse interface long after the PS/2 brand was withdrawn); this fairly quickly drove the bus mouse design out of the marketplace.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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