I think you ' ll probably enjoy rereading them in ten , twenty or maybe thirty years from now than you ' ll enjoy whatever you can get in exchange . <| sep |>. F 12 and F 1 ? is F 12 like a hardcoded ' enable hotkey ' button or something ? oAnyways just a note on this too , you ' ll have two main options . DAR and PAR . PAR is Pixel Aspect Ratio . That ' s sized pixel perfect for the output signal for the system . Then you have DAR , which compensates for another problem . Pixel Perfect might sound right , but you old CRTs could display rectangular pixels , which many consoles and arcades used . DAR makes sure the SIZE is perfect . You pretty much want DAR unless lets say , you ' re someone who has been playing on PC emulators for years and PAR looks more correct to you at this point .