diff --git a/converter/adb_usb/config.h b/converter/adb_usb/config.h
index 70e09e2e..001df708 100644
--- a/converter/adb_usb/config.h
+++ b/converter/adb_usb/config.h
@@ -56,7 +56,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define ADB_PIN         PIND
 #define ADB_DDR         DDRD
 #define ADB_DATA_BIT    0
-//#define ADB_PSW_BIT     1       // optional
+#define ADB_PSW_BIT     1
 
 /* key combination for command */
 #ifndef __ASSEMBLER__
diff --git a/converter/adb_usb/matrix.c b/converter/adb_usb/matrix.c
index f6fecfd2..d7c600f2 100644
--- a/converter/adb_usb/matrix.c
+++ b/converter/adb_usb/matrix.c
@@ -621,6 +621,22 @@ uint8_t matrix_scan(void)
         if (!codes && adb_service_request()) codes = adb_host_kbd_recv(ADB_ADDR_KEYBOARD);
         if (codes) xprintf("%04X ", codes);
 
+        // Check PSW pin
+        static bool psw_state = false;
+        if (codes == 0) {
+            if (!psw_state) {
+                if (!adb_host_psw()) {
+                    codes = 0x7F7F; // power key press
+                    psw_state = true;
+                }
+            } else {
+                if (adb_host_psw()) {
+                    codes = 0xFFFF; // power key release
+                    psw_state = false;
+                }
+            }
+        }
+
         // Adjustable keybaord media keys
         if (codes == 0 && has_media_keys &&
                 (codes = adb_host_kbd_recv(ADB_ADDR_APPLIANCE))) {