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The screen shows a repetitive pattern of (correct) ice-cube graphics, which will change if the DIP-switch setting is altered or the joystick is pushed. The sound amp seems to be ok, as the pot produces some noise when turned. The CPU seems to be ok, as the board reacts to switch settings. My guess is, that at least one of the EPROMS is partially unreadable, or (worse) some video logic ist broken. It would be nice if someone could dump the EPROMS of his board and send the binaries to me or/and give some other repair hints.