- there are 3 screen modes : Aspect FS which stretches the screen but keeping aspect ratio, Stretched full screenand native. During native mode you will see a frame around the screen this frame can be customized !by default the emulator will first look for game sepecific frames being <romename>.tga if it doesn't find it it willlook for the file name gnuboy.tga in the folder where you loaded the rom from, if it doesn't find that one it will doa final check in A:\\game\\ for a gnuboy.tga and load that one. If they all fail the default frame will be loaded. - about frames : The frames have to be a 320x240 uncompressed tga image ! do not try to use another format or another resolution.
