Programming a Motorola GM950 is not for the faint of heart. It is a hobby for the patient, the electrically competent, and the slightly masochistic. It requires treating a laptop like a vintage automobile—you need the right fuel (DOS), the right spark (serial voltage), and a prayer that the EEPROM hasn't decayed.
: If you're using a DIY or older serial cable, ensure your COM port is set to COM1 in Device Manager and that the FIFO buffer is turned off to prevent communication errors. How to Get Started Motorola GM950 Serial Programming Cable RKN4081 DOS motorola gm950 programming software top
If you want, I can:
Press (Program Radio). The software will verify the checksum and write the data. Do not disconnect any cables or power off the radio during this process . After 60–90 seconds, the radio will beep, indicating success. Programming a Motorola GM950 is not for the faint of heart
And it did that job perfectly. Forever.