diff --git a/10_day/Makefile b/10_day/Makefile
index 7546fc3..71add12 100644
--- a/10_day/Makefile
+++ b/10_day/Makefile
@@ -1,5 +1,5 @@
 OBJS_BOOTPACK = bootpack.obj naskfunc.obj hankaku.obj graphic.obj dsctbl.obj \
-		int.obj fifo.obj keyboard.obj mouse.obj memory.obj
+		int.obj fifo.obj keyboard.obj mouse.obj memory.obj sheet.obj
 
 TOOLPATH = ../z_tools/
 INCPATH  = ../z_tools/haribote/
diff --git a/10_day/bootpack.c b/10_day/bootpack.c
index 4f13ff3..7dd7d2c 100644
--- a/10_day/bootpack.c
+++ b/10_day/bootpack.c
@@ -9,6 +9,9 @@ void HariMain(void)
 	char s[40], mcursor[256], keybuf[32], mousebuf[128];
 	int mx, my, i;
 	struct MOUSE_DEC mdec;
+	struct SHTCTL *shtctl;
+	struct SHEET *sht_back, *sht_mouse;
+	unsigned char *buf_back, buf_mouse[256];
 
 	unsigned int memtotal;
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
@@ -30,16 +33,25 @@ void HariMain(void)
 	memman_free(memman, 0x00400000, memtotal - 0x00400000);
 
 	init_palette();
-	init_screen8(binfo->vram, binfo->scrnx, binfo->scrny);
-	mx = (binfo->scrnx - 16) / 2; /* 计算画面中心坐标 */
+	shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
+	sht_back = sheet_alloc(shtctl);
+	sht_mouse = sheet_alloc(shtctl);
+	buf_back = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
+	sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 没有透明色 */
+	sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99); /* 透明色号99 */
+	init_screen8(buf_back, binfo->scrnx, binfo->scrny);
+	init_mouse_cursor8(buf_mouse, 99); /* 背景色号99 */
+	sheet_slide(shtctl, sht_back, 0, 0);
+	mx = (binfo->scrnx - 16) / 2; /* 按显示在画面中央来计算坐标 */
 	my = (binfo->scrny - 28 - 16) / 2;
-	init_mouse_cursor8(mcursor, COL8_008484);
-	putblock8_8(binfo->vram, binfo->scrnx, 16, 16, mx, my, mcursor, 16);
-	sprintf(s, "(%d, %d)", mx, my);
-	putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_FFFFFF, s);
-
+	sheet_slide(shtctl, sht_mouse, mx, my);
+	sheet_updown(shtctl, sht_back, 0);
+	sheet_updown(shtctl, sht_mouse, 1);
+	sprintf(s, "(%3d, %3d)", mx, my);
+	putfonts8_asc(buf_back, binfo->scrnx, 0, 0, COL8_FFFFFF, s);
 	sprintf(s, "memory %dMB free : %dKB", memtotal / (1024 * 1024), memman_total(memman) / 1024);
-	putfonts8_asc(binfo->vram, binfo->scrnx, 0, 32, COL8_FFFFFF, s);
+	putfonts8_asc(buf_back, binfo->scrnx, 0, 32, COL8_FFFFFF, s);
+	sheet_refresh(shtctl);
 
 	for (;;) {
 		io_cli();
@@ -50,8 +62,9 @@ void HariMain(void)
 				i = fifo8_get(&keyfifo);
 				io_sti();
 				sprintf(s, "%02X", i);
-				boxfill8(binfo->vram, binfo->scrnx, COL8_008484,  0, 16, 15, 31);
-				putfonts8_asc(binfo->vram, binfo->scrnx, 0, 16, COL8_FFFFFF, s);
+				boxfill8(buf_back, binfo->scrnx, COL8_008484, 0, 16, 15, 31);
+				putfonts8_asc(buf_back, binfo->scrnx, 0, 16, COL8_FFFFFF, s);
+				sheet_refresh(shtctl);
 			} else if (fifo8_status(&mousefifo) != 0) {
 				i = fifo8_get(&mousefifo);
 				io_sti();
@@ -67,10 +80,9 @@ void HariMain(void)
 					if ((mdec.btn & 0x04) != 0) {
 						s[2] = 'C';
 					}
-					boxfill8(binfo->vram, binfo->scrnx, COL8_008484, 32, 16, 32 + 15 * 8 - 1, 31);
-					putfonts8_asc(binfo->vram, binfo->scrnx, 32, 16, COL8_FFFFFF, s);
-					/* 鼠标指针的移动 */
-					boxfill8(binfo->vram, binfo->scrnx, COL8_008484, mx, my, mx + 15, my + 15); /* 隐藏鼠标 */
+					boxfill8(buf_back, binfo->scrnx, COL8_008484, 32, 16, 32 + 15 * 8 - 1, 31);
+					putfonts8_asc(buf_back, binfo->scrnx, 32, 16, COL8_FFFFFF, s);
+					/* 移动光标 */
 					mx += mdec.x;
 					my += mdec.y;
 					if (mx < 0) {
@@ -86,9 +98,9 @@ void HariMain(void)
 						my = binfo->scrny - 16;
 					}
 					sprintf(s, "(%3d, %3d)", mx, my);
-					boxfill8(binfo->vram, binfo->scrnx, COL8_008484, 0, 0, 79, 15); /* 隐藏坐标 */
-					putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_FFFFFF, s); /* 显示坐标 */
-					putblock8_8(binfo->vram, binfo->scrnx, 16, 16, mx, my, mcursor, 16); /* 描画鼠标 */
+					boxfill8(buf_back, binfo->scrnx, COL8_008484, 0, 0, 79, 15); /* 消坐标 */
+					putfonts8_asc(buf_back, binfo->scrnx, 0, 0, COL8_FFFFFF, s); /* 写坐标 */
+					sheet_slide(shtctl, sht_mouse, mx, my); /* 包含sheet_refresh含sheet_refresh */
 				}
 			}
 		}
diff --git a/10_day/bootpack.h b/10_day/bootpack.h
index 3e572bb..e6a6809 100644
--- a/10_day/bootpack.h
+++ b/10_day/bootpack.h
@@ -13,14 +13,19 @@ struct BOOTINFO { /* 0x0ff0-0x0fff */
 void io_hlt(void);
 void io_cli(void);
 void io_sti(void);
+void io_stihlt(void);
+int io_in8(int port);
 void io_out8(int port, int data);
 int io_load_eflags(void);
 void io_store_eflags(int eflags);
 void load_gdtr(int limit, int addr);
 void load_idtr(int limit, int addr);
+int load_cr0(void);
+void store_cr0(int cr0);
 void asm_inthandler21(void);
 void asm_inthandler27(void);
 void asm_inthandler2c(void);
+unsigned int memtest_sub(unsigned int start, unsigned int end);
 
 /* fifo.c */
 struct FIFO8 {
@@ -119,7 +124,7 @@ extern struct FIFO8 mousefifo;
 
 /* memory.c */
 #define MEMMAN_FREES 4090 /* 大约是32KB*/
-#define MEMMAN_ADDR 0x003c0000
+#define MEMMAN_ADDR			0x003c0000
 
 struct FREEINFO { /* 可用信息 */
 	unsigned int addr, size;
@@ -133,6 +138,30 @@ unsigned int memtest(unsigned int start, unsigned int end);
 void memman_init(struct MEMMAN *man);
 unsigned int memman_total(struct MEMMAN *man);
 unsigned int memman_alloc(struct MEMMAN *man, unsigned int size);
-unsigned int memman_alloc_4k(struct MEMMAN *man, unsigned int size);
 int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size);
+unsigned int memman_alloc_4k(struct MEMMAN *man, unsigned int size);
 int memman_free_4k(struct MEMMAN *man, unsigned int addr, unsigned int size);
+
+/* sheet.c */
+#define MAX_SHEETS		256
+#define SHEET_USE  1
+
+struct SHEET {
+	unsigned char *buf;
+	int bxsize, bysize, vx0, vy0, col_inv, height, flags;
+};
+
+struct SHTCTL {
+	unsigned char *vram;
+	int xsize, ysize, top;
+	struct SHEET *sheets[MAX_SHEETS];
+	struct SHEET sheets0[MAX_SHEETS];
+};
+
+struct SHTCTL *shtctl_init(struct MEMMAN *memman, unsigned char *vram, int xsize, int ysize);
+struct SHEET *sheet_alloc(struct SHTCTL *ctl);
+void sheet_setbuf(struct SHEET *sht, unsigned char *buf, int xsize, int ysize, int col_inv);
+void sheet_updown(struct SHTCTL *ctl, struct SHEET *sht, int height);
+void sheet_refresh(struct SHTCTL *ctl);
+void sheet_slide(struct SHTCTL *ctl, struct SHEET *sht, int vx0, int vy0);
+void sheet_free(struct SHTCTL *ctl, struct SHEET *sht);
diff --git a/10_day/sheet.c b/10_day/sheet.c
new file mode 100644
index 0000000..dd05ca9
--- /dev/null
+++ b/10_day/sheet.c
@@ -0,0 +1,142 @@
+/* sheet */
+
+#include "bootpack.h"
+
+#define SHEET_USE		1
+
+struct SHTCTL *shtctl_init(struct MEMMAN *memman, unsigned char *vram, int xsize, int ysize)
+{
+	struct SHTCTL *ctl;
+	int i;
+	ctl = (struct SHTCTL *) memman_alloc_4k(memman, sizeof (struct SHTCTL));
+	if (ctl == 0) {
+		goto err;
+	}
+	ctl->vram = vram;
+	ctl->xsize = xsize;
+	ctl->ysize = ysize;
+	ctl->top = -1; /* �V�[�g�͈ꖇ���Ȃ� */
+	for (i = 0; i < MAX_SHEETS; i++) {
+		ctl->sheets0[i].flags = 0; /* 标记为未使用 */
+	}
+err:
+	return ctl;
+}
+
+struct SHEET *sheet_alloc(struct SHTCTL *ctl)
+{
+	struct SHEET *sht;
+	int i;
+	for (i = 0; i < MAX_SHEETS; i++) {
+		if (ctl->sheets0[i].flags == 0) {
+			sht = &ctl->sheets0[i];
+			sht->flags = SHEET_USE; /* 标记为正在使用*/
+			sht->height = -1; /* 隐藏 */
+			return sht;
+		}
+	}
+	return 0;  /* 所有的SHEET都处于正在使用状态*/
+}
+
+void sheet_setbuf(struct SHEET *sht, unsigned char *buf, int xsize, int ysize, int col_inv)
+{
+	sht->buf = buf;
+	sht->bxsize = xsize;
+	sht->bysize = ysize;
+	sht->col_inv = col_inv;
+	return;
+}
+
+void sheet_updown(struct SHTCTL *ctl, struct SHEET *sht, int height)
+{
+	int h, old = sht->height; /* 存储设置前的高度信息 */
+	if (height > ctl->top + 1) {
+		height = ctl->top + 1;
+	}
+	if (height < -1) {
+		height = -1;
+	}
+	sht->height = height;/* 设定高度 */
+
+	/* 下面主要是进行sheets[ ]的重新排列 */
+	if (old > height) { /* 比以前低 */
+		if (height >= 0) {
+		/* 把中间的往上提 */
+			for (h = old; h > height; h--) {
+				ctl->sheets[h] = ctl->sheets[h - 1];
+				ctl->sheets[h]->height = h;
+			}
+			ctl->sheets[height] = sht;
+		} else { /* 隐藏 */
+			if (ctl->top > old) {
+			/* 把上面的降下来 */
+				for (h = old; h < ctl->top; h++) {
+					ctl->sheets[h] = ctl->sheets[h + 1];
+					ctl->sheets[h]->height = h;
+				}
+			}
+			ctl->top--; /* 由于显示中的图层减少了一个，所以最上面的图层高度下降 */
+		}
+		sheet_refresh(ctl); /* 按新图层的信息重新绘制画面 */    
+	} else if (old < height) { /* 比以前高 */
+		if (old >= 0) {
+		/* 把中间的拉下去 */
+			for (h = old; h < height; h++) {
+				ctl->sheets[h] = ctl->sheets[h + 1];
+				ctl->sheets[h]->height = h;
+			}
+			ctl->sheets[height] = sht;
+		} else { /* 由隐藏状态转为显示状态 */
+		/* 将已在上面的提上来 */
+			for (h = ctl->top; h >= height; h--) {
+				ctl->sheets[h + 1] = ctl->sheets[h];
+				ctl->sheets[h + 1]->height = h + 1;
+			}
+			ctl->sheets[height] = sht;
+			ctl->top++; /* 由于已显示的图层增加了1个，所以最上面的图层高度增加 */
+		}
+		sheet_refresh(ctl); /* 按新图层信息重新绘制画面 */
+	}
+	return;
+}
+
+void sheet_refresh(struct SHTCTL *ctl)
+{
+	int h, bx, by, vx, vy;
+	unsigned char *buf, c, *vram = ctl->vram;
+	struct SHEET *sht;
+	for (h = 0; h <= ctl->top; h++) {
+		sht = ctl->sheets[h];
+		buf = sht->buf;
+		for (by = 0; by < sht->bysize; by++) {
+			vy = sht->vy0 + by;
+			for (bx = 0; bx < sht->bxsize; bx++) {
+				vx = sht->vx0 + bx;
+				c = buf[by * sht->bxsize + bx];
+				if (c != sht->col_inv) {
+					vram[vy * ctl->xsize + vx] = c;
+				}
+			}
+		}
+	}
+	return;
+}
+
+void sheet_slide(struct SHTCTL *ctl, struct SHEET *sht, int vx0, int vy0)
+{
+	sht->vx0 = vx0;
+	sht->vy0 = vy0;
+	if (sht->height >= 0) { /* 如果正在显示*/
+		sheet_refresh(ctl); /* 按新图层的信息刷新画面 */
+	}
+	return;
+}
+
+void sheet_free(struct SHTCTL *ctl, struct SHEET *sht)
+{
+	if (sht->height >= 0) {
+		sheet_updown(ctl, sht, -1); /* 如果处于显示状态，则先设定为隐藏 */
+	}
+	sht->flags = 0; /* "未使用"标志 */
+	return;
+}