This little gadget can listen to the keyboard of an Amiga 500 and catch certain hotkeys. These hotkeys can be used to drive output pins that can configure internal extentions.
Please have a look at the project website:
https://www.jm27.de/key-tap-a-hardware-configurator-for-the-amiga-500/
All material is freely usable under the GPL v2
* hardware: Contains Eagle PCB files
* firmware: Pre-built hex-files for different MCUs
* src: the C-source code
* doc: Documentation