I can't say we've fully tested this device but it works for us and we haven't had any issues. There are 4 x 128MB modules on a card, you press a button to toggle between the 128MB modules and there is an indicator to show which module is active. Make sure the system is powered off before switching between units. You get 3 save slots per game on a memory card, while here you get 3 per unit. Very useful if you want to save multiple games.
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