diff --git a/13_day/bootpack.c b/13_day/bootpack.c
index 18cd32c..ac20b43 100644
--- a/13_day/bootpack.c
+++ b/13_day/bootpack.c
@@ -30,7 +30,8 @@ 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);
@@ -195,3 +196,16 @@ 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;
+}