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diff --git a/Pico/cd/cd_sys.h b/Pico/cd/cd_sys.h
new file mode 100644
index 0000000..34c9126
--- /dev/null
+++ b/Pico/cd/cd_sys.h
@@ -0,0 +1,97 @@
+#ifndef _CD_SYS_H
+#define _CD_SYS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define INT_TO_BCDB(c)										\
+((c) > 99)?(0x99):((((c) / 10) << 4) + ((c) % 10));
+
+#define INT_TO_BCDW(c)										\
+((c) > 99)?(0x0909):((((c) / 10) << 8) + ((c) % 10));
+
+#define BCDB_TO_INT(c)										\
+(((c) >> 4) * 10) + ((c) & 0xF);
+
+#define BCDW_TO_INT(c)										\
+(((c) >> 8) * 10) + ((c) & 0xF);
+
+
+typedef struct
+{
+  unsigned char M;
+  unsigned char S;
+  unsigned char F;
+} _msf;
+
+typedef struct
+{
+	unsigned char Type;
+	unsigned char Num;
+	_msf MSF;
+} _scd_track;
+
+typedef struct
+{
+	unsigned char First_Track;
+	unsigned char Last_Track;
+	_scd_track Tracks[100];
+} _scd_toc;
+
+typedef struct {
+	unsigned int Status_CDD;
+	unsigned int Status_CDC;
+	_scd_toc TOC;
+	int Cur_LBA;
+	unsigned int Cur_Track;
+} _scd;
+
+
+extern int CD_Timer_Counter;
+
+
+void LBA_to_MSF(int lba, _msf *MSF);
+int Track_to_LBA(int track);
+
+
+void Check_CD_Command(void);
+
+int  Init_CD_Driver(void);
+void End_CD_Driver(void);
+int  Insert_CD(char *buf, char *iso_name);
+void Stop_CD(void);
+void Change_CD(void);
+void Reset_CD(void);
+
+int Get_Status_CDD_c0(void);
+int Stop_CDD_c1(void);
+int Get_Pos_CDD_c20(void);
+int Get_Track_Pos_CDD_c21(void);
+int Get_Current_Track_CDD_c22(void);
+int Get_Total_Lenght_CDD_c23(void);
+int Get_First_Last_Track_CDD_c24(void);
+int Get_Track_Adr_CDD_c25(void);
+int Play_CDD_c3(void);
+int Seek_CDD_c4(void);
+int Pause_CDD_c6(void);
+int Resume_CDD_c7(void);
+int Fast_Foward_CDD_c8(void);
+int Fast_Rewind_CDD_c9(void);
+int CDD_cA(void);
+int Close_Tray_CDD_cC(void);
+int Open_Tray_CDD_cD(void);
+
+int CDD_Def(void);
+
+//void Write_CD_Audio(short *Buf, int rate, int channel, int lenght);
+//void Update_CD_Audio(int **Buf, int lenght);
+
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif
+