The CoPico Centipede interfaces your CoCo with a Raspberry PI RP2350B. It can be used as a software defined I/O board, a programmable timer, even 'spoon feed' and bootstrap an Operating System automatically. The centipede also adds a 'hat' connector, in fact Lostwizard has already cooked up a FujiNet hat! Or build your own, see 'bingo board'.
Henry's talk last CoCoFEST: https://www.youtube.com/watch?v=zje2UbjjAuk
Coming events: We don't have a case yet, but they'll look like the Bonobo case except the outer top half comes off for wearing hats. If you grab a working working board now, we'll send a case as they come off the printer.
And if you bought a Bonobo, trade up for free! Expect an email...