Verify if your GM950 is an Alpha or Radius version; source matching software. Bad serial connection or wrong COM port selection.
You can find modern "RIB-less" USB programming cables online. These have the voltage translation circuitry built directly into the USB plug. 💻 How to Run the Software on Modern PCs motorola gm950 programming software new
Searching for "Motorola GM950 programming software new" yields thousands of frustrated forum posts. Why? Verify if your GM950 is an Alpha or
: Supports basic 4-channel configuration and 5-tone signalling. or Windows 98.
Motorola GM950 Radio Programming Software (often referred to as RSS or CPS depending on the exact firmware version). Operating System: Native MS-DOS, Windows 95, or Windows 98.