extern void text8( void );
extern void text4( void );
extern void grafix( void );

extern void CLEAR4 ( unsigned, char );
extern void CLEAR4A( unsigned, char );
extern void CLEAR3 ( unsigned, char );
extern void CLEAR3A( unsigned, char );
extern void CLEAR2 ( unsigned, char );
extern void CLEAR2A( unsigned, char );
extern void CLEAR1 ( unsigned, char );
extern void CLEAR1A( unsigned, char );
extern void CLEAR0 ( unsigned, char );

extern int  MRead( unsigned );
extern void MWrite( unsigned, unsigned );
extern void MWB00T( unsigned, unsigned );