If you have spent three hours trying to force a USB adapter to work in DOSBox and are ready to throw the radio out the window, consider these alternatives:
The GM950 communicates via a 2.5mm to DB-9 (RS-232) serial programming cable. It does not use USB natively. Attempting to use a cheap "USB programming cable" from Amazon often fails due to voltage mismatches and timing issues. Motorola Gm950 Programming Software
Abstract The Motorola GM950 is a mobile radio transceiver utilizing the Visar/GM series architecture. Unlike modern Software Defined Radios (SDRs), the GM950 relies on embedded microcontroller logic where the Programming Software (RSS—Radio Service Software) acts as a peripheral interface to write binary configuration data to the radio's EEPROM. This paper explores the communication protocols, memory architecture, and software interaction specific to the GM950. If you have spent three hours trying to
A critical technical aspect of the GM950 is the strict dependency between the Firmware (internal to the radio) and the RSS version. Abstract The Motorola GM950 is a mobile radio
| Metric | Official CPS (Win98/DOS) | pyGM950 (Python 3.11) | |-----------------------|--------------------------|------------------------| | Read time (full) | 32 sec | 35 sec | | Write time (full) | 48 sec | 52 sec | | OS support | Win9x/DOS only | Any with Python + FTDI | | Checksum verification | Yes | Yes (+auto-correct) | | Batch programming | No | Yes (CSV import) |
A GUI wrapper using Tkinter was also developed, allowing channel editing without manual hex manipulation.