diff --git a/src/mame/machine/dec_lk201.cpp b/src/mame/machine/dec_lk201.cpp
index e9acf70bc21..a25facd0e67 100644
--- a/src/mame/machine/dec_lk201.cpp
+++ b/src/mame/machine/dec_lk201.cpp
@@ -658,9 +658,9 @@ void lk201_device::send_port(address_space &space, UINT8 offset, UINT8 olddata)
 				if (portc & 0x2) kbd_data = m_kbd17->read();
 			}
 			// Check for LED update strobe
-			if (((portc & 0x80) == 0) && (olddata & 0x40))
+			if (((portc & 0x80) == 0) && (olddata & 0x80))
 			{
-^				// Lower nibble contains the LED values (1 = on, 0 = off)
+				// Lower nibble contains the LED values (1 = on, 0 = off)
 				machine().output().set_value("led_wait"   , (led_data & 0x1) == 1);
 				machine().output().set_value("led_compose", (led_data & 0x2) == 2);
 				machine().output().set_value("led_lock"   , (led_data & 0x4) == 4);