Mouse Support in XFree86 : OS Support for Mice : OpenBSD
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## 3.11. OpenBSD

OpenBSD does not support extended PS/2 mouse protocols (`"xxxPS/2"`).

The PS/2 mouse device driver `/dev/pms` emulates the bus mouse. Specify the `"BusMouse"` protocol for any PS/2 mouse regardless of the brand of the mouse when using this device.

The raw PS/2 mouse device driver `/dev/psm` uses the standard PS/2 mouse protocol. Therefore, you should specify the `"PS/2"` protocol for any PS/2 mouse regardless of the brand of the mouse when using this device.

Mouse Support in XFree86 : OS Support for Mice : OpenBSD
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