diff --git a/src/mess/machine/abc890.c b/src/mess/machine/abc890.c
index 9598664c8e4..0e9caac4f85 100644
--- a/src/mess/machine/abc890.c
+++ b/src/mess/machine/abc890.c
@@ -26,22 +26,22 @@ const device_type ABC850 = &device_creator<abc850_device>;
 
 WRITE_LINE_MEMBER( abc890_device::int_w )
 {
-	m_bus->int_w(state);
+	m_slot->int_w(state);
 }
 
 WRITE_LINE_MEMBER( abc890_device::nmi_w )
 {
-	m_bus->nmi_w(state);
+	m_slot->nmi_w(state);
 }
 
 WRITE_LINE_MEMBER( abc890_device::rdy_w )
 {
-	m_bus->rdy_w(state);
+	m_slot->rdy_w(state);
 }
 
 WRITE_LINE_MEMBER( abc890_device::resin_w )
 {
-	m_bus->resin_w(state);
+	m_slot->resin_w(state);
 }
 
 static ABCBUS_INTERFACE( abcbus_intf )
diff --git a/src/mess/machine/abcbus.c b/src/mess/machine/abcbus.c
index ab8abff7d12..3785388075e 100644
--- a/src/mess/machine/abcbus.c
+++ b/src/mess/machine/abcbus.c
@@ -30,6 +30,7 @@ const device_type ABCBUS_SLOT = &device_creator<abcbus_slot_device>;
 device_abcbus_card_interface::device_abcbus_card_interface(const machine_config &mconfig, device_t &device)
 	: device_slot_card_interface(mconfig, device)
 {
+	m_slot = dynamic_cast<abcbus_slot_device *>(device.owner());
 }
 
 
diff --git a/src/mess/machine/abcbus.h b/src/mess/machine/abcbus.h
index 3a1a5163511..fe3b672cf7c 100644
--- a/src/mess/machine/abcbus.h
+++ b/src/mess/machine/abcbus.h
@@ -134,7 +134,7 @@ public:
 	virtual void abcbus_xmemw(offs_t offset, UINT8 data) { };
 
 public:
-	abcbus_slot_device  *m_bus;
+	abcbus_slot_device  *m_slot;
 };
 
 
diff --git a/src/mess/machine/lux10828.c b/src/mess/machine/lux10828.c
index f9e8c2cadc1..e9eff12f924 100644
--- a/src/mess/machine/lux10828.c
+++ b/src/mess/machine/lux10828.c
@@ -663,7 +663,7 @@ WRITE8_MEMBER( luxor_55_10828_device::status_w )
 	m_status = data & 0xfe;
 
 	// interrupt
-	m_bus->int_w(BIT(data, 0) ? CLEAR_LINE : ASSERT_LINE);
+	m_slot->int_w(BIT(data, 0) ? CLEAR_LINE : ASSERT_LINE);
 }