internal关键词用于限定成员变量访问范围(没记错的话,C++太久没看了)- b- M6 z! C& R. V
FME-7是一块声音芯片,说明如下:. P6 X6 l( G& C1 }+ n
The FME-7 was made by Sunsoft and used as an extension soundchip in Nintendo Famicom / NES Games. It was only used in a single Sunsoft Game (Gimmick!) and is otherwise known as the Mapper 69