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) 7 D2 L: K9 V5 T* w- y; W: SFME-7是一块声音芯片,说明如下: : q1 B+ P7 i5 N6 Z3 U9 fThe 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