MiSTer FPGA Forum

Just for the benefit of those following along, this was resolved after some chat outside the forum and looks like it turned out to be an electrical signalling issue. If you're rolling your own wiring, bear in mind that I2C is extremely sensitive and can be broken by noisy signalling - keep wires short and use shielded cabling if possible. Enjoy :)...

So I’ve built the User Port to Pi cable and put the MT32-Pi files onto a Micro SD card in a Pi 3 I had lying around. It lights up but I can’t seem to find the settings in the MiSTer menus to enable/select it. Where should I find the setting in the ao486 core?