diff --git a/include/global.h b/include/global.h
index 0c1562c..43b2bbe 100644
--- a/include/global.h
+++ b/include/global.h
@@ -12,7 +12,7 @@
 #include "protect.h"
 #include "proc.h"
 #include "const.h"
-#define USE_FBCON
+//#define USE_FBCON
 extern int		kernel_initial;
 
 extern int		ticks;
@@ -55,4 +55,4 @@ struct memfree{
 
 #include "fs_const.h"
 #include "hd.h"
-extern struct hd_info hd_info[1];   //added by mingxuan 2020-10-27
\ No newline at end of file
+extern struct hd_info hd_info[1];   //added by mingxuan 2020-10-27
diff --git a/kernel/fbcon.c b/kernel/fbcon.c
index 44102b7..dcc669e 100644
--- a/kernel/fbcon.c
+++ b/kernel/fbcon.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "proto.h"
 
 #ifdef USE_FBCON
 
@@ -9,7 +10,6 @@
 #include "memman.h"
 #include "proc.h"
 #include "protect.h"
-#include "proto.h"
 #include "serialport.h"
 #include "spinlock.h"
 #include "stdio.h"
diff --git a/kernel/ktest.c b/kernel/ktest.c
index 7db6044..9ebf2aa 100644
--- a/kernel/ktest.c
+++ b/kernel/ktest.c
@@ -130,6 +130,7 @@ void initial()
 	printf("untar:%s\n", full_name);
 	strcat(full_name, INSTALL_FILENAME);
 	untar(full_name);
+#ifdef USE_FBCON
 
     kprintf("loading font(%dKB) to %p...", HZK16_SIZE / num_1K, hzk16h_buf);
 	printf("Loading Font HZK16H...\n");
@@ -145,12 +146,15 @@ void initial()
     kprintf("[\x1b[32mOK\x1b[0m]\n");
 	printf("Font loaded.\n");
 	printf("Loaing Simple Shell...\n");
+#endif
 	do_vclose(stdin);
 	do_vclose(stdout);
 	do_vclose(stderr);
-	// while(untared) yield();
+#ifdef USE_FBCON
 	exec("orange/shell_0.bin");
-
+#else
+	exec("orange/shell_1.bin");
+#endif
 	while (1)
 		;
 }
\ No newline at end of file
diff --git a/lib/kprintf.c b/lib/kprintf.c
index 0cc6378..9c27eb1 100644
--- a/lib/kprintf.c
+++ b/lib/kprintf.c
@@ -9,8 +9,8 @@
 static void kprintfputch(int ch, int *cnt)
 {
 	write_serial(ch);
-	// char _ch = ch;
-	// tty_write(cur_ntty, &_ch, 1);
+	char _ch = ch;
+	tty_write(cur_ntty, &_ch, 1);
 	(*cnt)++;
 }