G3 to G4 upgrade help with connector

[fro10987]

I have a G3(OS9) and a G4(OSX). I would like to do away with the G3 and just use the G4 however I need to be able to plug in a security dongle to run a piece of equipment from the G4 that is currently run by the G3. The connection is a 4pin mini din (this is the old Mac keyboard plug on the computer) This connector looks like a S-Video connection but I am not sure if the pin wiring is the same. Does anyone have a workaround for this I have not been able to find a adapter of any sort via google. Any help is greatly appreciated.
Keith

 

[Angrist]

Sounds like and ADB (Apple Desktop Bus) port, used for Mice and Keyboards and whatnot.

You can get an ADB-USB adapter from Griffin, the iMate. It's rather expensive, but i've seen them for around $10 on ebay from time to time.