Not sure about the joystick. Don't have one.
As for the screen, what do you mean by 3/4?

I remember (don't have an 800) there was a glitch with the 800 that wouldn't show the onscreen buttons that normally take up the right side of the screen. If the right side of the screen is blank, that's your onscreen buttons.

There's a video on youtube about xgngeo that shows it and how to get it to display.

desiv