| 比如: void           _never_executed(void );
 
 unsigned short _bcd_add_short(unsigned short, unsigned short);
 unsigned long  _bcd_add_long(unsigned long, unsigned long);
 
 unsigned int   _even_in_range(unsigned int, unsigned int);
 void           _op_code(unsigned short);
 void           _data20_write_char(unsigned long, unsigned char);
 void           _data20_write_short(unsigned long, unsigned short);
 void           _data20_write_long(unsigned long, unsigned long);
 unsigned char  _data20_read_char(unsigned long);
 unsigned short _data20_read_short(unsigned long);
 unsigned long  _data20_read_long(unsigned long);
 unsigned short _get_interrupt_state(void);
 void           _set_interrupt_state(unsigned short);
 unsigned short _get_SP_register(void);
 void           _set_SP_register(unsigned short);
 话说有讲解这些东西的资料没?
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