CoPico Bonobo interfaces your CoCo with a Raspberry PI Pico. It can be used as a software defined I/O board, a programmable timer, or most interesting, Bonobo can 'spoon feed' and bootstrap an Operating System automatically.
Tether software on your PC does said spooning. The included firmware loads 'NekotOS', a multi user gaming OS. We are starting small, a couple demos using 32x16 VDG TEXT, Semigraphics(64x32) or PMODE1(128x96 4color).
Details on writing actual games in the docs, developers wanted!