More details can be found here: https://diyelectromusic.wordpress.com/2024/01/09/raspberry-pi-pico-synth_dexed/ Updates for the latest version can be found here ...

The A8PicoCart is a multi-cart for the Atari 8-bit (XL/XE) which you can make at home with only basic soldering skills. It is based on my earlier UnoCart design but uses a very inexpensive Raspberry ...