The schematics and PCB are 90% the same as the Spectrum's. They differ in the port decoding.
NOTE: Counters are reset to 0 at power on. It's not yet confirmed if they are reset to 0 from a bus reset.
=== I/O decoding ===
Exact i/o port decoding is not known, the following is the minimum needed to not clash with other hardware.
I/O port for X position is decoded as xxxx 1011 xxx0 xxx0 (FBEE is normally used)