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.

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 ...

You can’t screw up Arduino’s new DIY electronics kit The $87 Plug and Make Kit includes an Arduino microcomputer, electronic components, and tutorials for building several IoT devices.