I use the openGL/directX filters to have a nice Pal-overscan-like screen on my 15.4" TFT LCD screen.
It`s very nice, and you may experiment with old games, like "Golden Axe", that are programmed with a big black border amiga-natively (displaying various info or just left black). Stretching the display to the screen borders gives a totaly different impression and gameplay experience (like the coin-op games).
Regarding the digital joystick, all you have to do is to get a
CMS Joystick, plug a USB adaptor (if you don`t have a joyport) and start playing! ;-)
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