text: /*
   * Copyright (c) 2020 ZhongYao Luo <luozhongyao@gmail.com>
   * 
   * SPDX-License-Identifier: 
   */
  
  
  #ifndef __PSG_H__
  #define __PSG_H__
  
  #include <stdint.h>
  
  uint8_t nes_psg_read(uint8_t addr);
  void nes_psg_write(uint8_t addr, uint8_t val);
  
  #endif /* __PSG_H__*/
  
  