exxos's Atari, Amiga & retro forum

Has anyone tried Midi Maze on an H5 before? My original H5 seems to have issues with the midi ring. It seems to initialize, but when trying to start a game I get the error message "uh-oh midi ring boohoo" or something similar.

I checked my soldering of the ports and no issues there. The H5 has worked flawlessly otherwise.

Was the opto pre-fitted? I ask as some people fitted the opto from a original ST which isn't compatible with the H5..