It can boot CP/M3, blink some diodes, play some tunes and talks to the Pi5 over GPIO.
This was supposed to be nothing more than a practical joke which quite unexpectedly worked out. It is not optimized (never meant to be), the CP/M3 port working on it is very crude and the bit-banging SPI over AY's I/O ports is terribly slow when it comes to accessing the SD Card adapter (C:).