A printing apparatus has an apparatus body including a platen roller, a thermal head, a storage in which a ribbon cartridge is stored exchangeably through an opening, and a cover of the apparatus body that covers the opening so as to be opened and closed. The first heat-dissipating device is contacted with a memory module. The translucency can be graduated so that, over time, if the window’s contents remain unchanged, the window becomes more translucent. A decision is made as to whether one signal is appropriate or whether multiple audio signals should be combined.