is there a simple adaptor to use a din-4 pin wired Kensington turbo mouse Trackball
with a 2008 IMac usb input?
Love to keep old tech working.
Anonymous
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There's a few options. You can choose cheap, or easy, but no option I'm aware of combines both.
The Griffin iMate converted the 4-pin din Apple ADB to USB. But they command a high price on the used market.
Or you can roll your own with an Arduino microcontroller:
http://blog.jomon-lab.com/arduino-projects/adb-to-usb-adapter-using-arduino-keyboard-function
Or a Teensy:
http://ifixit.org/blog/4468/hack-it-better-apple-extended-keyboard-ii/
* note that the latter two are actually meant for ADB keyboards, so there's still some coding needed to get a mouse/trackball working.