The Ultimate Guide to Free Motorola GP300 GM 300 Software Download
How to Download and Program Motorola GP300 GM 300 Software
If you have a Motorola GP300 or GM 300 radio, you might want to know how to download and program it using your computer. This can help you customize the radio settings, frequencies, channels, and other features. However, programming these radios is not as easy as using a modern software. You will need some special hardware and software to do it.
Motorola GP300 GM 300 Software
In this article, we will show you what you need and how to download and program Motorola GP300 GM 300 software.
What you need
To download and program Motorola GP300 GM 300 software, you will need the following items:
A Motorola GP300 or GM 300 radio
A PC or laptop with a RS232 serial interface or a RS232 to USB converter
A 9V battery or a lab bench power supply
A RIB-less programming cable for the GP300 or GM 300 radio
A USB to serial cable with FTDI chipset (if you use a RS232 to USB converter)
The Motorola GP300 GM 300 software (also known as RSS)
A DOS emulator such as DOSBox
You can buy the programming cables and the USB to serial cable from online stores such as eBay or RadioArena. You can download the Motorola GP300 GM 300 software from Radiotronics UK for free. You can download DOSBox from its official website.
How to download and program Motorola GP300 GM 300 software
Once you have all the items ready, you can follow these steps to download and program Motorola GP300 GM 300 software:
Connect the programming cable to the back of the radio. If you have a GP300 radio, you will need to remove the battery first. If you have a GM 300 radio, you will need to plug the cable into the front of the radio.
Connect the 9V battery or the power supply to the VCC/GND wires of the programming cable. The red LED on the cable should light up.
Connect the DB9 serial port of the programming cable to your PC or laptop. If you use a RS232 to USB converter, connect it to your USB port and use a USB to serial cable.
Find out the serial port number of your PC or laptop. If you use Windows, you can check it in the device manager (Win + R â devmgmt.msc). Serial devices start with COM and have a number at the end, e.g. COM3. If you use Linux, you can enter ls /dev/ttyUSB* (if you use a USB adapter) or ls /dev/ttyS* (if you use an internal port) in your terminal. The output will show something like /dev/ttyUSB0 or /dev/ttyS0.
Download and install DOSBox on your PC or laptop. Run it once to generate the configuration file.
Edit the configuration file (dosbox.conf) with a text editor. Scroll down to the [serial] section and edit the serial1 line so that it matches this format: serial1=directserial realport:COM1. Make sure that you use your real serial port number instead of COM1.
Download and unzip the Motorola GP300 GM 300 software to a subdirectory on your PC or laptop. Remember the path.
Start DOSBox (you might need administrative/root privileges to use the serial port). Press Ctrl+F11 several times to lower the CPU speed (cycles) to around 211.
Type mount c c:\path\to\software (replace c:\path\to\software with your actual path) and press Enter. This will mount your subdirectory as drive C in DOSBox.
Type c: and press Enter. This will change your current drive to C.
Type gp300 and press Enter. This will start the programming software. Press Enter at the credits screen and press F9 to go into the setup menu.
Use F3 to go to the PC configuration. Press Enter twice to verify that RIB serial port is set to COM1 (which is our virtual serial port ad790ac5ba