The GBA starts up with its ROM interface set to a wait state of 4/2 cycles: it will wait 4 cycles for the first 16-bit word of a transfer and 2 cycles for each additional 16-bit word. Official GBA Game Paks are capable of a wait state of 3/1 cycles, and one of the first thing that an official game will usually do is reprogram the GBA's ROM interface to work at 3/1 wait state. However, the 32 MB RAM in the SuperCard does not work at 3/1; to allow games to work, the SuperCard patcher prevents the game from reprogramming the ROM interface. (If you have a DS, a SuperCard, and a SuperKey or other NoPass card, you can demonstrate this using memtestARM: the RAM tests will fail for any speed faster than 4/2.)