Disable Serial Mouse Detection

Microsoft Windows’ backwards compatibility with ancient hardware is usually nice to have but sometimes it detects other serial devices as a serial mouse. This happens whether the device is connected to a real TIA-232 port or a Universal Serial Bus (USB) to TIA-232 adapter. Some USB connected devices, e.g. GPS receivers, have USB to TIA-232 convertors built right into the device.

  1. Tap the Windows key to begin a start menu search
  2. Start typing regedit and when the menu entry for Registry Editor App appears
  3. Right click the menu entry and choose Run as administrator
  4. When the, Do you want this app to make changes to your device?, prompt appears choose the Yes button
  5. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sermouse
  6. Since Windows 10 updates will sometimes change this value back to the default, bookmark this entry so you can get back to it easily in the future.
  7. Change the value of the Start key from 3 to 4
  8. Close Registry Editor and reboot the PC

I learned which registry key to change and its setting options from here and here.

If you want to retain the capability of using a serial mouse and just disable it for on one port see here.

 

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