**Connect VIN pin of Arduino to [any Raspberry's 5v pin](https://pinout.xyz/pinout/5v_power) for PS/2 only device. But you don't need to connect the Arduino VIN pin if you connected USB (Arduino will get power through it).**
## Fixing USB absolute mouse on Windows 98
## Fixing the USB absolute mouse on Windows 98
Due to an ancient buggy driver, the USB absolute mouse on Windows 98 moves only within the upper-left quarter of the screen. To fix this, you need to recompile the firmware with uncommented flag `-DHID_USB_ABS_WIN98_FIX` in `platformio.ini`.