on the serial port (Device Manager → Ports → Properties → Power Management → uncheck “Allow computer to turn off this device”).

After installation, you must configure the software to communicate with the radio:

The official software for the GM950 is called Motorola Radio Service Software (RSS) or CPS (Customer Programming Software) , depending on the version. This software is DOS-based (even the Windows versions run in a DOS box). It will not run directly on 64-bit versions of Windows 7, 8, 10, or 11. You will need a 32-bit OS or a DOS emulator (like DOSBox).

Installing the CPS. Ok, let's get the last part done. If you downloaded the Motorola RSS you will find two folders in the archive.

The software is "installed" (it’s not really installed – DOS apps are standalone). You are now running GM950 RSS.

to handle signal conversion, though some modern "RIB-less" USB cables integrate this circuitry.