Every time I login to this site, years have past! Where does the time go! Reading back on old posts and the work that has been done over the years with emulating so many platforms. A lot I’ve worked on! MPU4, MPU5, MPU6, S4, S5, S6, Epoch, Eclipse, Barcrest Video (Crystal Maze). I can say, it’s impressive and I can appreciate the blood sweat and tears. I originally started off asking about Crystal Maze SWP emulation. Wow, seeing that emulated blew me away. All I can say is some of you lot are geniuses! Stay safe.
The coin mech may have a divertor plug. It’s plugs into the back of coin mech it allows the machine to alter the coin mech diversion based on hopper balance. YMMV
I can’t remember with Epoch, but Barcrest machine used to have a circuit which detected if you were trying to ‘Spark’ the machine with a piezoelectric generator. The circuit is meant to detect this and reset the machine, to help prevent fraud. The dial is probably a pot which adjust the sensitivity. I may be wrong, but there yah go.