Actually, in the more recent versions of mame, you can select under TAB the video option; there, you can choose the screen to display, this way you can only display the game screen (0 I think). The only problem with this is, that since PlayChoice games use a timer (which is in the instruction screen) you won't be able to see it how much time you have left, so you can't really tell how long before your time runs out. Makes sense? Not really sure if you can display the instruction screen in a secundary display.