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)# S+ Z: l, g0 n
FME-7是一块声音芯片,说明如下:9 G8 t) I- g8 t/ p) M" Y5 z% i
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