The main changes I've made are: - Calibration screen with instructions, and calibration stored per port and lightgun - Improved lightgun in games: It will not default to the center of the screen if not "seen"; tweaked the lightgun "processing" so it will hit almost every time(even when pointed in a black area), and will reload if you shoot offscreen (at least on those games that have support for it by the mame core) - Multiple lightgun support - Tweaks for compatibility (there where some Joytech Sharp Shooters that had the white and black buttons half-pressed internally, had to increase threshold for button pressing) " (From a anonomous source, not a official release)