-extern void PlayLevelSound_EM(int, int, int, int);
-extern void InitGraphicInfo_EM(void);
-extern void CheckSingleStepMode_EM(byte action[], int,
- boolean, boolean, boolean);
+void PlayLevelSound_EM(int, int, int, int);
+void InitGraphicInfo_EM(void);
+void CheckSingleStepMode_EM(byte action[], int, boolean, boolean, boolean);