diff --git a/12_day/bootpack.c b/12_day/bootpack.c
index 811e2ef..1894d26 100644
--- a/12_day/bootpack.c
+++ b/12_day/bootpack.c
@@ -8,7 +8,8 @@ void make_window8(unsigned char *buf, int xsize, int ysize, char *title);
 void HariMain(void)
 {
 	struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
-	char s[40], keybuf[32], mousebuf[128];
+	struct FIFO8 timerfifo;
+	char s[40], keybuf[32], mousebuf[128], timerbuf[8];
 	int mx, my, i;
 	unsigned int memtotal;
 	struct MOUSE_DEC mdec;
@@ -20,13 +21,16 @@ void HariMain(void)
 	init_gdtidt();
 	init_pic();
 	io_sti(); /* IDT/PIC的初始化已经完成，于是开放CPU的中断 */
-
 	fifo8_init(&keyfifo, 32, keybuf);
 	fifo8_init(&mousefifo, 128, mousebuf);
 	init_pit();
 	io_out8(PIC0_IMR, 0xf8); /* PIT和PIC1和键盘设置为许可(11111000) */
 	io_out8(PIC1_IMR, 0xef); /* 开放鼠标中断(11101111) */
 
+	fifo8_init(&timerfifo, 8, timerbuf);
+	settimer(1000, &timerfifo, 1);
+
+
 	init_keyboard();
 	enable_mouse(&mdec);
 	memtotal = memtest(0x00400000, 0xbfffffff);
@@ -68,7 +72,7 @@ void HariMain(void)
 		sheet_refresh(sht_win, 40, 28, 120, 44); /* 到这里结束 */
 
 		io_cli();
-		if (fifo8_status(&keyfifo) + fifo8_status(&mousefifo) == 0) {
+		if (fifo8_status(&keyfifo) + fifo8_status(&mousefifo) + fifo8_status(&timerfifo) == 0) {
 			io_sti(); /* 不做HLT */
 		} else {
 			if (fifo8_status(&keyfifo) != 0) {
@@ -117,6 +121,11 @@ void HariMain(void)
 					sheet_refresh(sht_back, 0, 0, 80, 16); /* 刷新文字 */
 					sheet_slide(sht_mouse, mx, my); /* 包含sheet_refresh含sheet_refresh */
 				}
+			} else if (fifo8_status(&timerfifo) != 0) {
+				i = fifo8_get(&timerfifo); /* 首先读入（为了设定起始点） */
+				io_sti();
+				putfonts8_asc(buf_back, binfo->scrnx, 0, 64, COL8_FFFFFF, "10[sec]");
+				sheet_refresh(sht_back, 0, 64, 56, 80);
 			}
 		}
 	}
diff --git a/12_day/bootpack.h b/12_day/bootpack.h
index 4453c10..d6c2c6f 100644
--- a/12_day/bootpack.h
+++ b/12_day/bootpack.h
@@ -171,8 +171,12 @@ void sheet_free(struct SHEET *sht);
 /* timer.c */
 struct TIMERCTL {
 	unsigned int count;
+	unsigned int timeout;
+	struct FIFO8 *fifo;
+	unsigned char data;
 };
 extern struct TIMERCTL timerctl;
 
 void init_pit(void);
 void inthandler20(int *esp);
+void settimer(unsigned int timeout, struct FIFO8 *fifo, unsigned char data);
diff --git a/12_day/timer.c b/12_day/timer.c
index 41b7e81..e014a96 100644
--- a/12_day/timer.c
+++ b/12_day/timer.c
@@ -9,10 +9,11 @@ struct TIMERCTL timerctl;
 
 void init_pit(void)
 {
-	io_out8(PIT_CTRL, 0x43);
+	io_out8(PIT_CTRL, 0x34);
 	io_out8(PIT_CNT0, 0x9c);
 	io_out8(PIT_CNT0, 0x2e);
 	timerctl.count = 0;
+	timerctl.timeout = 0;
 	return;
 }
 
@@ -20,5 +21,23 @@ void inthandler20(int *esp)
 {
 	io_out8(PIC0_OCW2, 0x60); /* 把IRQ-00信号接收完了的信息通知给PIC */
 	timerctl.count++;
+	if (timerctl.timeout > 0) { /* 如果已经设定了超时 */
+		timerctl.timeout--;
+		if (timerctl.timeout == 0) {
+			fifo8_put(timerctl.fifo, timerctl.data);
+		}
+	}
+	return;
+}
+
+void settimer(unsigned int timeout, struct FIFO8 *fifo, unsigned char data)
+{
+	int eflags;
+	eflags = io_load_eflags();
+	io_cli();
+	timerctl.timeout = timeout;
+	timerctl.fifo = fifo;
+	timerctl.data = data;
+	io_store_eflags(eflags);
 	return;
 }