diff --git a/26_day/bootpack.c b/26_day/bootpack.c
index a2a4c98..46f1742 100644
--- a/26_day/bootpack.c
+++ b/26_day/bootpack.c
@@ -7,7 +7,6 @@
 
 void keywin_off(struct SHEET *key_win);
 void keywin_on(struct SHEET *key_win);
-struct SHEET *open_console(struct SHTCTL *shtctl, unsigned int memtotal);
 void close_console(struct SHEET *sht);
 void close_constask(struct TASK *task);
 
@@ -17,14 +16,14 @@ void HariMain(void)
 	struct SHTCTL *shtctl;
 	char s[40];
 	struct FIFO32 fifo, keycmd;
-	int fifobuf[128], keycmd_buf[32], *cons_fifo[2];
+	int fifobuf[128], keycmd_buf[32];
 	int mx, my, i, new_mx = -1, new_my = 0, new_wx = 0x7fffffff, new_wy = 0;
 	unsigned int memtotal;
 	struct MOUSE_DEC mdec;
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
-	unsigned char *buf_back, buf_mouse[256], *buf_cons[2];
+	unsigned char *buf_back, buf_mouse[256];
 	struct SHEET *sht_back, *sht_mouse;
-	struct TASK *task_a, *task_cons[2], *task;
+	struct TASK *task_a, *task;
 	static char keytable0[0x80] = {
 		0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0x08, 0,
 		'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0x0a, 0, 'A', 'S',
@@ -89,11 +88,11 @@ void HariMain(void)
 	mx = (binfo->scrnx - 16) / 2; /* 计算坐标使其位于画面中央 */
 	my = (binfo->scrny - 28 - 16) / 2;
 
-	sheet_slide(sht_back, 0, 0);
-	sheet_slide(key_win, 32, 4);
+	sheet_slide(sht_back,  0,  0);
+	sheet_slide(key_win,   32, 4);
 	sheet_slide(sht_mouse, mx, my);
-	sheet_updown(sht_back, 0);
-	sheet_updown(key_win, 1);
+	sheet_updown(sht_back,  0);
+	sheet_updown(key_win,   1);
 	sheet_updown(sht_mouse, 2);
 	keywin_on(key_win);
 
@@ -189,9 +188,9 @@ void HariMain(void)
 					fifo32_put(&keycmd, KEYCMD_LED);
 					fifo32_put(&keycmd, key_leds);
 				}
-				if (i == 256 + 0x3b && key_shift != 0 && key_win != 0) {
+				if (i == 256 + 0x3b && key_shift != 0 && key_win != 0) {	/* Shift+F1 */
 					task = key_win->task;
-					if (task != 0 && task->tss.ss0 != 0) {	/* Shift+F1 */
+					if (task != 0 && task->tss.ss0 != 0) {
 						cons_putstr0(task->cons, "\nBreak(key) :\n");
 						io_cli(); /*强制结束处理时禁止任务切换*/
 						task->tss.eax = (int) &(task->tss.esp0);
@@ -199,7 +198,7 @@ void HariMain(void)
 						io_sti();
 					}
 				}
-				if (i == 256 + 0x3c && key_shift != 0) { /* Shift+F2 */
+				if (i == 256 + 0x3c && key_shift != 0) {	/* Shift+F2 */
 					if (key_win != 0) {
 						keywin_off(key_win);
 					}
@@ -256,7 +255,7 @@ void HariMain(void)
 										if (3 <= x && x < sht->bxsize - 3 && 3 <= y && y < 21) {
 											mmx = mx; /*进入窗口移动模式*/
 											mmy = my;
-											mmx2 = sht->vx0; 
+											mmx2 = sht->vx0;
 											new_wy = sht->vy0;
 										}
 										if (sht->bxsize - 21 <= x && x < sht->bxsize - 5 && 5 <= y && y < 19) {
@@ -274,7 +273,7 @@ void HariMain(void)
 												fifo32_put(&task->fifo, 4);
 												io_sti();
 											}
-										} 
+										}
 										break;
 									}
 								}
@@ -284,7 +283,7 @@ void HariMain(void)
 							x = mx - mmx; /*计算鼠标指针移动量*/
 							y = my - mmy;
 							new_wx = (mmx2 + x + 2) & ~3;
-							new_wy = new_wy + y; 
+							new_wy = new_wy + y;
 							mmy = my;
 						}
 					} else {
@@ -293,11 +292,13 @@ void HariMain(void)
 						if (new_wx != 0x7fffffff) {
 							sheet_slide(sht, new_wx, new_wy); /*固定图层位置*/
 							new_wx = 0x7fffffff;
-						} 
+						}
 					}
 				}
 			} else if (768 <= i && i <= 1023) { /*命令行窗口关闭处理*/
 				close_console(shtctl->sheets0 + (i - 768));
+			} else if (1024 <= i && i <= 2023) {
+				close_constask(taskctl->tasks0 + (i - 1024));
 			}
 		}
 	}
@@ -321,19 +322,13 @@ void keywin_on(struct SHEET *key_win)
 	return;
 }
 
-struct SHEET *open_console(struct SHTCTL *shtctl, unsigned int memtotal)
+struct TASK *open_constask(struct SHEET *sht, unsigned int memtotal)
 {
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
-	struct SHEET *sht = sheet_alloc(shtctl);
-	unsigned char *buf = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
 	struct TASK *task = task_alloc();
+	int *cons_fifo = (int *) memman_alloc_4k(memman, 128 * 4);
 	task->cons_stack = memman_alloc_4k(memman, 64 * 1024);
 	task->tss.esp = task->cons_stack + 64 * 1024 - 12;
-	int *cons_fifo = (int *) memman_alloc_4k(memman, 128 * 4);
-	sheet_setbuf(sht, buf, 256, 165, -1); /*无透明色*/
-	make_window8(buf, 256, 165, "console", 0);
-	make_textbox8(sht, 8, 28, 240, 128, COL8_000000);
-	task->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 12;
 	task->tss.eip = (int) &console_task;
 	task->tss.es = 1 * 8;
 	task->tss.cs = 2 * 8;
@@ -344,9 +339,20 @@ struct SHEET *open_console(struct SHTCTL *shtctl, unsigned int memtotal)
 	*((int *) (task->tss.esp + 4)) = (int) sht;
 	*((int *) (task->tss.esp + 8)) = memtotal;
 	task_run(task, 2, 2); /* level=2, priority=2 */
-	sht->task = task;
-	sht->flags |= 0x20;	/*有光标*/
 	fifo32_init(&task->fifo, 128, cons_fifo, task);
+	return task;
+}
+
+struct SHEET *open_console(struct SHTCTL *shtctl, unsigned int memtotal)
+{
+	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
+	struct SHEET *sht = sheet_alloc(shtctl);
+	unsigned char *buf = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
+	sheet_setbuf(sht, buf, 256, 165, -1); /*无透明色*/
+	make_window8(buf, 256, 165, "console", 0);
+	make_textbox8(sht, 8, 28, 240, 128, COL8_000000);
+	sht->task = open_constask(sht, memtotal);
+	sht->flags |= 0x20;	/*有光标*/
 	return sht;
 }
 
diff --git a/26_day/bootpack.h b/26_day/bootpack.h
index 5da0cb7..2195e24 100644
--- a/26_day/bootpack.h
+++ b/26_day/bootpack.h
@@ -224,6 +224,7 @@ struct TASKCTL {
 	struct TASKLEVEL level[MAX_TASKLEVELS];
 	struct TASK tasks0[MAX_TASKS];
 };
+extern struct TASKCTL *taskctl;
 extern struct TIMER *task_timer;
 struct TASK *task_now(void);
 struct TASK *task_init(struct MEMMAN *memman);
@@ -257,6 +258,7 @@ void cmd_dir(struct CONSOLE *cons);
 void cmd_type(struct CONSOLE *cons, int *fat, char *cmdline);
 void cmd_exit(struct CONSOLE *cons, int *fat);
 void cmd_start(struct CONSOLE *cons, char *cmdline, int memtotal);
+void cmd_ncst(struct CONSOLE *cons, char *cmdline, int memtotal);
 int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline);
 int *hrb_api(int edi, int esi, int ebp, int esp, int ebx, int edx, int ecx, int eax);
 int *inthandler0d(int *esp);
@@ -274,3 +276,6 @@ void file_readfat(int *fat, unsigned char *img);
 void file_loadfile(int clustno, int size, char *buf, int *fat, char *img);
 struct FILEINFO *file_search(char *name, struct FILEINFO *finfo, int max);
 
+/* bootpack.c */
+struct TASK *open_constask(struct SHEET *sht, unsigned int memtotal);
+struct SHEET *open_console(struct SHTCTL *shtctl, unsigned int memtotal);
diff --git a/26_day/console.c b/26_day/console.c
index f72e450..f85ec8c 100644
--- a/26_day/console.c
+++ b/26_day/console.c
@@ -17,9 +17,11 @@ void console_task(struct SHEET *sheet, int memtotal)
 	cons.cur_c = -1;
 	task->cons = &cons;
 
-	cons.timer = timer_alloc();
-	timer_init(cons.timer, &task->fifo, 1);
-	timer_settime(cons.timer, 50);
+	if (sheet != 0) {
+		cons.timer = timer_alloc();
+		timer_init(cons.timer, &task->fifo, 1);
+		timer_settime(cons.timer, 50);
+	}
 	file_readfat(fat, (unsigned char *) (ADR_DISKIMG + 0x000200));
 
 	/*显示提示符*/
@@ -72,6 +74,9 @@ void console_task(struct SHEET *sheet, int memtotal)
 					cmdline[cons.cur_x / 8 - 2] = 0;
 					cons_newline(&cons);
 					cons_runcmd(cmdline, &cons, fat, memtotal); /*运行命令*/
+					if (sheet == 0) {
+						cmd_exit(&cons, fat);
+					}
 					/*显示提示符*/
 					cons_putchar(&cons, '>', 1);
 				} else {
@@ -84,10 +89,12 @@ void console_task(struct SHEET *sheet, int memtotal)
 				}
 			}
 			/*重新显示光标*/
-			if (cons.cur_c >= 0) {
-				boxfill8(sheet->buf, sheet->bxsize, cons.cur_c, cons.cur_x, cons.cur_y, cons.cur_x + 7, cons.cur_y + 15);
+			if (sheet != 0) {
+				if (cons.cur_c >= 0) {
+					boxfill8(sheet->buf, sheet->bxsize, cons.cur_c, cons.cur_x, cons.cur_y, cons.cur_x + 7, cons.cur_y + 15);
+				}
+				sheet_refresh(sheet, cons.cur_x, cons.cur_y, cons.cur_x + 8, cons.cur_y + 16);
 			}
-			sheet_refresh(sheet, cons.cur_x, cons.cur_y, cons.cur_x + 8, cons.cur_y + 16);
 		}
 	}
 }
@@ -99,8 +106,10 @@ void cons_putchar(struct CONSOLE *cons, int chr, char move)
 	s[1] = 0;
 	if (s[0] == 0x09) { /*制表符*/
 		for (;;) {
-			putfonts8_asc_sht(cons->sht, cons->cur_x, cons->cur_y, COL8_FFFFFF, COL8_000000, " ", 1);
-			cons->cur_x += 8;
+			if (cons->sht != 0) {
+				putfonts8_asc_sht(cons->sht, cons->cur_x, cons->cur_y, COL8_FFFFFF, COL8_000000, " ", 1);
+				cons->cur_x += 8;
+			}
 			if (cons->cur_x == 8 + 240) {
 				cons_newline(cons);
 			}
@@ -113,7 +122,9 @@ void cons_putchar(struct CONSOLE *cons, int chr, char move)
 	} else if (s[0] == 0x0d) { /*回车*/
 		/*先不做任何操作*/
 	} else { /*一般字符*/
-		putfonts8_asc_sht(cons->sht, cons->cur_x, cons->cur_y, COL8_FFFFFF, COL8_000000, s, 1);
+		if (cons->sht != 0) {
+			putfonts8_asc_sht(cons->sht, cons->cur_x, cons->cur_y, COL8_FFFFFF, COL8_000000, s, 1);
+		}
 		if (move != 0) {
 			/* move为0时光标不后移*/
 			cons->cur_x += 8;
@@ -133,17 +144,19 @@ void cons_newline(struct CONSOLE *cons)
 		cons->cur_y += 16; /*到下一行*/
 	} else {
 		/*滚动*/
-		for (y = 28; y < 28 + 112; y++) {
-			for (x = 8; x < 8 + 240; x++) {
-				sheet->buf[x + y * sheet->bxsize] = sheet->buf[x + (y + 16) * sheet->bxsize];
+		if (sheet != 0) {
+			for (y = 28; y < 28 + 112; y++) {
+				for (x = 8; x < 8 + 240; x++) {
+					sheet->buf[x + y * sheet->bxsize] = sheet->buf[x + (y + 16) * sheet->bxsize];
+				}
 			}
-		}
-		for (y = 28 + 112; y < 28 + 128; y++) {
-			for (x = 8; x < 8 + 240; x++) {
-				sheet->buf[x + y * sheet->bxsize] = COL8_000000;
+			for (y = 28 + 112; y < 28 + 128; y++) {
+				for (x = 8; x < 8 + 240; x++) {
+					sheet->buf[x + y * sheet->bxsize] = COL8_000000;
+				}
 			}
+			sheet_refresh(sheet, 8, 28, 8 + 240, 28 + 128);
 		}
-		sheet_refresh(sheet, 8, 28, 8 + 240, 28 + 128);
 	}
 	cons->cur_x = 8;
 	return;
@@ -168,19 +181,21 @@ void cons_putstr1(struct CONSOLE *cons, char *s, int l)
 
 void cons_runcmd(char *cmdline, struct CONSOLE *cons, int *fat, int memtotal)
 {
-	if (strcmp(cmdline, "mem") == 0) {
+	if (strcmp(cmdline, "mem") == 0 && cons->sht != 0) {
 		cmd_mem(cons, memtotal);
-	} else if (strcmp(cmdline, "cls") == 0) {
+	} else if (strcmp(cmdline, "cls") == 0 && cons->sht != 0) {
 		cmd_cls(cons);
-	} else if (strcmp(cmdline, "dir") == 0 || strcmp(cmdline, "ls") == 0) {
+	} else if ((strcmp(cmdline, "dir") == 0 || strcmp(cmdline, "ls") == 0) && cons->sht != 0) {
 		cmd_dir(cons);
-	} else if (strncmp(cmdline, "type ", 5) == 0) {
+	} else if (strncmp(cmdline, "type ", 5) == 0 && cons->sht != 0) {
 		cmd_type(cons, fat, cmdline);
 	} else if (strcmp(cmdline, "exit") == 0) {
 		cmd_exit(cons, fat);
 	} else if (strncmp(cmdline, "start ", 6) == 0) {
 		cmd_start(cons, cmdline, memtotal);
-	} else if (cmdline[0] != 0) {
+	} else if (strncmp(cmdline, "ncst ", 5) == 0) {
+		cmd_ncst(cons, cmdline, memtotal); 
+	}else if (cmdline[0] != 0) {
 		if (cmd_app(cons, fat, cmdline) == 0) {
 			/*不是命令，不是应用程序，也不是空行*/
 			cons_putstr0(cons, "Bad command.\n\n");
@@ -263,10 +278,16 @@ void cmd_exit(struct CONSOLE *cons, int *fat)
 	struct TASK *task = task_now();
 	struct SHTCTL *shtctl = (struct SHTCTL *) *((int *) 0x0fe4);
 	struct FIFO32 *fifo = (struct FIFO32 *) *((int *) 0x0fec);
-	timer_cancel(cons->timer);
+	if (cons->sht != 0) {
+		timer_cancel(cons->timer);
+	}
 	memman_free_4k(memman, (int) fat, 4 * 2880);
 	io_cli();
-	fifo32_put(fifo, cons->sht - shtctl->sheets0 + 768); /* 768〜1023 */
+	if (cons->sht != 0) {
+		fifo32_put(fifo, cons->sht - shtctl->sheets0 + 768); /* 768〜1023 */
+	} else {
+		fifo32_put(fifo, task - taskctl->tasks0 + 1024); /*1024～2023*/
+	}
 	io_sti();
 	for (;;) {
 		task_sleep(task);
@@ -290,6 +311,21 @@ void cmd_start(struct CONSOLE *cons, char *cmdline, int memtotal)
 	return;
 }
 
+void cmd_ncst(struct CONSOLE *cons, char *cmdline, int memtotal)
+{
+	struct TASK *task = open_constask(0, memtotal);
+	struct FIFO32 *fifo = &task->fifo;
+	int i;
+
+	/*将命令行输入的字符串逐字复制到新的命令行窗口中*/
+	for (i = 5; cmdline[i] != 0; i++) {
+		fifo32_put(fifo, cmdline[i] + 256);
+	}
+	fifo32_put(fifo, 10 + 256); /*回车键*/
+	cons_newline(cons);
+	return;
+}
+
 int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline)
 {
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;