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) " q$ k6 k5 G. }& {7 e# a" kFME-7是一块声音芯片,说明如下: 7 n) B- }; M. v& M: T3 c5 kThe 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