Thanks, post found. BTw I can't find the xmamerc file in the 770 (which should be the xml file to modify, if I understand well), I hav a home/user/.mame directory, but it contains nothing but other four dirs. The cfg directory inside contains some .cfg files (with a "default.cfg" too), but they are not in plain text format so I suppose I should not touch them. Could you suggest where the xml file should be located?
Yes, already seen: nice work! Anyway I'd like those software buttons, almost like someone has already suggested assigning the stylus tap to the button 1...