My daughter likes buttons. She's learning letters. I was bored over winter break and had these parts laying around... so I built her a "Button Box" based around an Arduino. Open source, hackable ...

The 486 that [someyob] is restoring had the Turbo button, but sadly there was just a simple LED to show whether or not it was engaged.

The output can be digital (in several formats) or analog. The radio takes serial (I2C) commands, and the Arduino converts the user interface so that you can control it.