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) ; x( W( l; t) o/ G- u; ~0 {: sFME-7是一块声音芯片,说明如下: , x4 o$ y* w E ]+ X( nThe 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