: Download and install DOSBox, which allows you to run DOS-based applications and older versions of Windows on modern hardware .
What (if any) are you seeing on your screen?
You need a GM950-compatible programming cable. This usually connects to the microphone jack (RJ45) on the front of the radio. motorola gm950 programming software install
This happens when running the software on a CPU that is too fast. You must use DOSBox and limit the CPU cycles ( Ctrl + F11 to reduce cycles down to around 3000-5000).
: Most modern users use a USB-to-RJ45 programming cable . These often use FTDI or similar chips that require specific drivers to appear as a Virtual COM Port . : Download and install DOSBox, which allows you
: Motorola RSS for this model often came on multiple floppy discs. Copy the files from "Disk 1" and "Disk 2" into a single directory on your PC (e.g., C:\GM950_Installer ) .
Insert your software media or navigate to the directory containing the installation files. This usually connects to the microphone jack (RJ45)
Run the installer and follow the on-screen prompts to complete installation. Step 3.2: Prepare the GM950 Software Files
| Error Message | Cause | Solution | | :--- | :--- | :--- | | | DOSBox/XP cannot access the serial port | Check cable driver. In DOSBox, ensure serial1= line is correct. On XP, close all other programs using COM1. | | "Radio not responding" (after pressing F2) | Cable wiring is wrong, or radio not in programming mode | Ensure radio is powered ON (12V DC). The GM950 does not require a special key sequence – just power on. Check cable pinout: GM950 uses pin 1 (ground), pin 2 (TX data to radio), pin 3 (RX data from radio). | | "16-bit MS-DOS Subsystem" error | You double-clicked GM950.EXE directly in 64-bit Windows | This will never work. Use DOSBox or a VM. | | Checksum error on read | Corrupted software file or bad serial connection | Redownload RSS. Lower baud rate (though GM950 is fixed at 9600 baud). Use a shorter serial cable (<6 ft). | | "ERROR: ICF file missing" | The configuration file is not in the same folder as GM950.EXE | Copy GM950.ICF into the same directory. |
Before diving into the installation process, you'll need to locate a copy of the software. Because the GM950 is a legacy product, Motorola no longer officially distributes its RSS. The software can typically be found on amateur radio forums, which often host archives of legacy software.
Attempting to run the software on modern 64-bit systems like Windows 10 or 11 often fails because modern Windows lacks the 16-bit subsystem required to execute the original DOS installer, and USB-to-serial adapters can corrupt data transmissions.