Play Red Pokemon On Mac Visualboy On OSX Saving Pokemon Mystery Dungeon Red?

Visualboy on OSX saving Pokemon Mystery Dungeon Red? - play red pokemon on mac

So basically, I downloaded Pokemon Mystery Dungeon Red and began to play today, but the problem is that I can not save the game. It says to press Shift + F1, to be saved, but when I do it only reduces the brightness, I have a MacBook. As Mac users, save your game?