diff --git a/CHANGELOG b/CHANGELOG
index 969344a..6d50751 100755
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,9 @@
 CHANGELOG
 =========
 
+2.3
+- ROM can be loaded from the directory of ROMDIR environment variable.
+
 2.2.1
 - Fix leaking memory on fd of loadBasic() function
 - Fix some coding style issue in memory.c and msgbuf.c 
diff --git a/README b/README
index 6bfc0ee..36ed906 100755
--- a/README
+++ b/README
@@ -19,6 +19,23 @@ How to install on Linux
 3. Run 
 	./napple1
 
+Optional ROM Directory
+======================
+napple1 contain basic.rom and monitor.rom files on
+the ./rom directory. However, If you want to put 
+basic.rom and monitor.rom on another directory. 
+Please use ROMDIR environmental variable.
+
+For example, if you want to put basic.rom and monitor.rom 
+on current directory, the command is:
+
+    ROMDIR=. ./napple1
+
+Default value of the ROMDIR is ./rom 
+You can use an absolute path for the ROM Directory.
+
+    ROMDIR=/home/username/my_rom_files ./napple1
+
 How to uninstall
 ================
 	cd napple1/src
diff --git a/src/main.c b/src/main.c
index 5693aea..164ce85 100755
--- a/src/main.c
+++ b/src/main.c
@@ -37,11 +37,14 @@ int main()
 	attron(A_REVERSE);
 	init_screen();
 	init_msgbuf();
-		
+
 	/* initialize apple1 screen */
 	resetScreen();
 	setSpeed(1000000, 50); /* 1M Hz. Sync emulation every 50 msec */
 
+    /* set Rom Files */
+    setRomFiles();
+
 	/* Load monitor rom */
 	if (!loadMonitor()) {
 		print_msgbuf("Failed loading rom/monitor.rom");
diff --git a/src/memory.c b/src/memory.c
index 3484c24..fd43898 100755
--- a/src/memory.c
+++ b/src/memory.c
@@ -84,10 +84,14 @@
 #include "msgbuf.h"
 
 #define MEMMAX 0xFFFF
+#define FNAME_LEN_MAX 1024
 
 static unsigned char mem[65536];
 static int mode = 8; /* 8 = Apple I 8K mode, 32 = napple1 32K mode */
 
+char rombasic[FNAME_LEN_MAX];
+char rommonitor[FNAME_LEN_MAX];
+
 void flipMode(void)
 {
 	if (mode == 8)
@@ -106,11 +110,11 @@ int memMode(void)
 
 void loadBasic(void)
 {
-	FILE *fd = fopen("rom/basic.rom", "rb");
+	FILE *fd = fopen(rombasic, "rb");
 	char input[MSG_LEN_MAX +1];
 	
 	if (!fd) {
-		gets_msgbuf("Failed to open rom/basic.rom: ", input);
+		gets_msgbuf("Failed to open basic.rom", input);
 		return;
 	}
 
@@ -130,7 +134,7 @@ void loadBasic(void)
 
 int loadMonitor(void)
 {
-	FILE *fd = fopen("rom/monitor.rom", "rb");
+	FILE *fd = fopen(rommonitor, "rb");
 
 	if (fd) {
 		fread(&mem[0xFF00], 1, 256, fd);
@@ -246,3 +250,25 @@ int loadCore(void)
 	}
 	return 1;
 }
+
+/* set ROM file name using ROMDIR env variable
+ * default path is ./rom 
+ * need to be called before loadBasic() and loadMonitor()
+ */
+void setRomFiles(void)
+{
+    char env[FNAME_LEN_MAX];
+    char *p;
+
+    strcpy(rombasic, "rom/basic.rom");
+    strcpy(rommonitor, "rom/monitor.rom");
+
+    p = env;
+    if (getenv("ROMDIR")) {
+        p = getenv("ROMDIR");
+        sprintf(rombasic, "%s/basic.rom", p);
+        sprintf(rommonitor, "%s/monitor.rom", p);
+    } 
+}
+
+
diff --git a/src/memory.h b/src/memory.h
index 22015ec..2f402ef 100755
--- a/src/memory.h
+++ b/src/memory.h
@@ -16,6 +16,8 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
+#define FNAME_LEN_MAX   1024
+
 void loadBasic(void);
 int loadMonitor(void);
 void resetMemory(void);
@@ -25,3 +27,4 @@ void dumpCore(void);
 int loadCore(void);
 int memMode(void);
 void flipMode(void);
+void setRomFiles(void);