diff --git a/21_day/Makefile b/21_day/Makefile
index 502df1c..efd8cfe 100644
--- a/21_day/Makefile
+++ b/21_day/Makefile
@@ -52,10 +52,23 @@ hello.hrb : hello.nas Makefile
 hello2.hrb : hello2.nas Makefile
 	$(NASK) hello2.nas hello2.hrb hello2.lst
 
+a.bim : a.obj a_nask.obj Makefile
+	$(OBJ2BIM) @$(RULEFILE) out:a.bim map:a.map a.obj a_nask.obj
+
+a.hrb : a.bim Makefile
+	$(BIM2HRB) a.bim a.hrb 0
+
+hello3.bim : hello3.obj a_nask.obj Makefile
+	$(OBJ2BIM) @$(RULEFILE) out:hello3.bim map:hello3.map hello3.obj a_nask.obj
+
+hello3.hrb : hello3.bim Makefile
+	$(BIM2HRB) hello3.bim hello3.hrb 0
+
 haribote.sys : asmhead.bin bootpack.hrb Makefile
 	copy /B asmhead.bin+bootpack.hrb haribote.sys
 
-haribote.img : ipl10.bin haribote.sys hello.hrb hello2.hrb Makefile
+haribote.img : ipl10.bin haribote.sys Makefile \
+		hello.hrb hello2.hrb a.hrb hello3.hrb
 	$(EDIMG)   imgin:../z_tools/fdimg0at.tek \
 		wbinimg src:ipl10.bin len:512 from:0 to:0 \
 		copy from:haribote.sys to:@: \
@@ -63,6 +76,8 @@ haribote.img : ipl10.bin haribote.sys hello.hrb hello2.hrb Makefile
 		copy from:make.bat to:@: \
 		copy from:hello.hrb to:@: \
 		copy from:hello2.hrb to:@: \
+		copy from:a.hrb to:@: \
+		copy from:hello3.hrb to:@: \
 		imgout:haribote.img
 
 # 其他指令
diff --git a/21_day/a.c b/21_day/a.c
new file mode 100644
index 0000000..0afb794
--- /dev/null
+++ b/21_day/a.c
@@ -0,0 +1,7 @@
+void api_putchar(int c);
+
+void HariMain(void)
+{
+	api_putchar('A');
+	return;
+}
diff --git a/21_day/a_nask.nas b/21_day/a_nask.nas
new file mode 100644
index 0000000..68f3c03
--- /dev/null
+++ b/21_day/a_nask.nas
@@ -0,0 +1,14 @@
+[FORMAT "WCOFF"]			; 生成对象文件的模式
+[INSTRSET "i486p"]		; 表示使用486兼容指令集
+[BITS 32]							; 生成32位模式机器语言
+[FILE "a_nask.nas"]		; 源文件名信息
+
+		GLOBAL	_api_putchar
+
+[SECTION .text]
+
+_api_putchar:	; void api_putchar(int c);
+		MOV		EDX,1
+		MOV		AL,[ESP+4]		; c
+		INT		0x40
+		RET
diff --git a/21_day/console.c b/21_day/console.c
index 051ed8a..bf8a05d 100644
--- a/21_day/console.c
+++ b/21_day/console.c
@@ -287,6 +287,14 @@ int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline)
 		*((int *) 0xfe8) = (int) p;
 		file_loadfile(finfo->clustno, finfo->size, p, fat, (char *) (ADR_DISKIMG + 0x003e00));
 		set_segmdesc(gdt + 1003, finfo->size - 1, (int) p, AR_CODE32_ER);
+		if (finfo->size >= 8 && strncmp(p + 4, "Hari", 4) == 0) {
+			p[0] = 0xe8;
+			p[1] = 0x16;
+			p[2] = 0x00;
+			p[3] = 0x00;
+			p[4] = 0x00;
+			p[5] = 0xcb;
+		} 
 		farcall(0, 1003 * 8);
 		memman_free_4k(memman, (int) p, finfo->size);
 		cons_newline(cons);
diff --git a/21_day/hello3.c b/21_day/hello3.c
new file mode 100644
index 0000000..17a53ad
--- /dev/null
+++ b/21_day/hello3.c
@@ -0,0 +1,11 @@
+void api_putchar(int c);
+
+void HariMain(void)
+{
+	api_putchar('h');
+	api_putchar('e');
+	api_putchar('l');
+	api_putchar('l');
+	api_putchar('o');
+	return;
+}