This page will hopefully be useful for people wanting to tackle modifying the Motorola MCX100 radio.

Included for download is a simple command line tool to create a binary image for burning into an EPROM (or Bipolar PROM if you can find one). This software is in a very early stage of development (this download includes a Linux x86 static binary and source code. A DOS binary will follow). For now it only supports 16 Chan VHF MCX100 radios with a Range II VCO unit. (You all know how it is - you work on something until it does what you need then move on...)

If anyone wants this code modified to do something slightly different let me know and I will see what I can do.

Anyway, after the programming was worked out, the major hassle was finding a way to fit a big bulky 2764 eprom into this radio. There are a few ideas for this. Some manage to cram it in to the very tight spaces available in the synth compartment but I decided to mount it in the neighboring VCO compartment. See here for a picture.

It doesn't seem to interfere with the operation of the radio and it gives you much more room. Your mileage may vary so try and be creative with this. I am sure you could probably fit a surface mount EEPROM + adapter in the synth compartment quite easily...

Anyway, download the software and have a go. If you have any problems, suggestions or criticisms, please feel free to email me at my qsl email address.

Oh, and if you have a Kenwood TK701S for sale let me know - Now that's an easy radio to modify..

More to come, so check back soon if you are interested in the MCX100.

Steve (VK2ZSZ).

Wiring diagram to convert from the original PROM to a 2764 EPROM.