diff --git a/13_day/bootpack.c b/13_day/bootpack.c
index ac20b43..18cd32c 100644
--- a/13_day/bootpack.c
+++ b/13_day/bootpack.c
@@ -30,8 +30,7 @@ void HariMain(void)
 	enable_mouse(&fifo, 512, &mdec);
 	io_out8(PIC0_IMR, 0xf8); /* 设定PIT和PIC1以及键盘为许可(11111000) */
 	io_out8(PIC1_IMR, 0xef); /* 开放鼠标中断(11101111) */
-	
-	set490（&fifo,1）；
+
 	timer = timer_alloc();
 	timer_init(timer, &fifo, 10);
 	timer_settime(timer, 1000);
@@ -196,16 +195,3 @@ void putfonts8_asc_sht(struct SHEET *sht, int x, int y, int c, int b, char *s, i
 	sheet_refresh(sht, x, y, x + l * 8, y + 16);
 	return;
 }
-
-void set490(struct FIFO32 *fifo, int mode){
-	int i;
-	struct TIMER *timer;
-	if (mode != 0) {
-		for (i = 0; i < 490; i++) {
-			timer = timer_alloc();
-			timer_init(timer, fifo, 1024 + i);
-			timer_settime(timer, 100 * 60 * 60 * 24 * 50 + i * 100);
-		}
-	}
-	return;
-}