Question about Motorola GP300 Compatible 2 Way Radio Battery Eliminator

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GP300 Radios Hi there, I wonder if you can help me, I recently acquired 3 GP300 radios all programmed to different channels, I then purchased a rib-less programming RS232 cable which came with software including a windows version however, I cannot get the radio to talk back on the comms port, I have tried various baud rates and fiddles including the comms port utility, do you know if I can program the radios using a Win98 boot disc in DOS mode? Thanks and regards Dave W

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  • dave woodgate Jan 08, 2009

    Hi Benimur,

    Thanks for your prompt response and suggestions, I've tried adjusting the bios settings and also slowing my pc down with cpugrab and using dosbox, still no luck I'm afraid, the Maxton RPC-M300 interface shows data flow with a green LED which flashes as the PC attempts to access the radio so I'm guessing there is out-going serial comms just nothing back from the radio.

    Can't think what I am doing wrong here.

    Going to try your Win98 start-up disc idea next.

    Thanks again for you help.

    Best regards

    Dave W

  • dave woodgate Jan 10, 2009

    Thanks to the both of you for asking, I have now managed to progam the radios, I needed to use a Win98 boot disc then default into DOS, select com 2 then program the radio from there before cloning the settings onto the other radios.

    Thanks again


  • Louie  Role
    Louie Role May 11, 2010

    Hi and welcome to FixYa,

    Initially, I believe you would have better chances running pure DOS (F5/8 before Win98 starts, I think 6.21 DOS version). I seem to remember also, that I always use COM2 perhaps because COM1 was often reserved for the serial mouse then. Having said that, you may want also to check in the CMOS/BIOS if there is even a COM2 or if it is enabled and that it is set to use IRQ 3 and I/O 2F8H.

    Would appreciate an update, curious too.

    Good luck and Thank you for using FixYa.



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I recommend you **** can the USB cable and get a RIB and Rib cable. The GP300 Motorola software is available online for free (I can give you the web page address) and works just like the real Motorola software. I have programmed at least 20 GP300s with it with no issues. A RIB is the only way to go. Everyone has nothing but trouble with USB cables. Particularly with newer radios like the CP200.

Posted on Jan 10, 2009

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Programming GP300 radios

Using an XP desktop with a COM port

Install DOSBOS 0.74

The program I use is called GP300std.exe

Copy GP300 folder to c:\

Plug in the cable with the GP300 RIB with a 9v power supply

Ensure it is in COM1

Go to Start /Progs/DosBox-0.74/options/Dosbox 0.74 options

Scroll towards the bottom of file and replace



serial1=directserial realport:com1


when you open Dosbox drag the top window to one side and hit CTRL-F11 x11 and CTRL-F12x1 this will give you a CPU around 440 cycles.

Then type

Mount c c:\gp300



The program should launch

Space bar

From here you should be able to read a preprogrammed GP300

F3 / F2 will read

Then F5 F5 will clone the radio.

Else F10 to go up one level then F4 to edit it.each mode is equal to each channel.

Once you've set the channels you can use F8 to programme the original radio or F5 to clone it.


Posted on Dec 08, 2010

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Hi again,

For some reason my initial post for clarification was deleted. In any case, any updates/developments?


Posted on Jan 10, 2009

  • Louie  Role
    Louie Role Jan 11, 2009

    Congratulations. The missing initial post was on the money on F5/8 & COM2.

    Thank you for posting back.


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