diff --git a/05_day/bootpack.c b/05_day/bootpack.c
index 0843d39..b3de470 100644
--- a/05_day/bootpack.c
+++ b/05_day/bootpack.c
@@ -26,20 +26,23 @@ void init_screen(char *vram, int x, int y);
 #define COL8_008484		14
 #define COL8_848484		15
 
+struct BOOTINFO {
+	char cyls, leds, vmode, reserve;
+	short scrnx, scrny;
+	char *vram;
+};
+
 void HariMain(void)
 {
 	char *vram;/* 声明变量vram、用于BYTE [...]地址 */
 	int xsize, ysize;
-	short *binfo_scrnx, *binfo_scrny;
-	int *binfo_vram;
+	struct BOOTINFO *binfo;
 
 	init_palette();
-	binfo_scrnx = (short *) 0x0ff4;
-	binfo_scrny = (short *) 0x0ff6;
-	binfo_vram = (int *) 0x0ff8;
-	xsize = *binfo_scrnx;
-	ysize = *binfo_scrny;
-	vram = (char *) *binfo_vram;
+	binfo = (struct BOOTINFO *) 0x0ff0;
+	xsize = (*binfo).scrnx;
+	ysize = (*binfo).scrny;
+	vram = (*binfo).vram;
 
 	init_screen(vram, xsize, ysize);