First, a simple
PRO-92 computer to radio converter.
This adapter will allow you to download the computer memory to the PRO-92. As it is very simple there should be no problems as both parts are available from Radio Shack. That is the reason I used the 510 as it is overkill for this application, but is the MOSFET that is carried at RS. I used the cable that came with the radio by cutting one of the ends off.
RS part number for the IRF 510 is 276-2072
I have tried it with the GRE demo program, also the Scanstar program. Ken Plotkin has a excellent program that once learned will allow easier programming with a text editor than the other 2. And it's free. You can downloaded it from the following links.
www.clark.net/~kplotkin/scanner.htm
Below is the link to the Text Editor I use.
By popular request here is a drawing of the layout of the components.
(ignore the label on the MOSFET, IRF510 is the correct number)
Now for something a little more complicated. This interface is bi directional, and will work with any computer. Interface's that use the computers serial port for power supply will not work on some computers as the serial port is protected from high currents, as the pins are not meant to supply current, just logic. With the circuit below I have not met a computer that it will not worked on. I designed this circuit back when a 486 33mhz computer was cutting edge, and I was using a 286 GRIDCASE computer to interface with cars. The only alteration is the zener diode and some resistance values to protect and adjust to the radios needs.
So, I use two 9 volt batteries to supply the bi polar power, and protect the computer. This interface can be used for other radio's as well by changing the zener diode value to match the radio if necessary.
