diff --git a/src/mess/drivers/abc80x.c b/src/mess/drivers/abc80x.c
index 1a104c08e73..e1668e08fdd 100644
--- a/src/mess/drivers/abc80x.c
+++ b/src/mess/drivers/abc80x.c
@@ -1035,6 +1035,8 @@ void abc800_state::machine_reset()
 
 	// 50/60 Hz
 	m_dart->cts_w(1, 0); // 0 = 50Hz, 1 = 60Hz
+
+	m_dfd_in = 0;
 }
 
 
@@ -1091,6 +1093,8 @@ void abc802_state::machine_reset()
 
 	// 50/60 Hz
 	m_dart->cts_w(1, BIT(config, 3)); // 0 = 50Hz, 1 = 60Hz
+	
+	m_dfd_in = 0;
 }
 
 
@@ -1170,6 +1174,8 @@ void abc806_state::machine_reset()
 
 	// 50/60 Hz
 	m_dart->cts_w(1, 0); // 0 = 50Hz, 1 = 60Hz
+	
+	m_dfd_in = 0;
 }