diff --git a/src/mess/video/911_vdt.c b/src/mess/video/911_vdt.c
index 4505ae459e1..c81435a58cf 100644
--- a/src/mess/video/911_vdt.c
+++ b/src/mess/video/911_vdt.c
@@ -176,6 +176,9 @@ void vdt911_device::device_start()
 {
 	m_last_key_pressed = 0x80;
 
+	m_keyboard_data_ready = false;
+	m_display_enable = false;
+
 	m_keyint_line.resolve();
 	m_lineint_line.resolve();