diff --git a/src/emu/machine/idectrl.c b/src/emu/machine/idectrl.c
index 11e4b858177..d7d3d12bc59 100644
--- a/src/emu/machine/idectrl.c
+++ b/src/emu/machine/idectrl.c
@@ -341,8 +341,8 @@ void ide_controller_device::device_start()
 				dev->m_dmarq_handler.set_callback(DEVCB2_DEVWRITELINE("^", ide_controller_device, dmarq1_write_line));
 			}
 
-			dev->m_csel = i;
-			dev->m_dasp = m_slot[1]->dev() != NULL;
+			dev->write_csel(i);
+			dev->write_dasp(m_slot[1]->dev() != NULL);
 		}
 	}
 
diff --git a/src/emu/machine/idehd.c b/src/emu/machine/idehd.c
index 43c19b311aa..fe8987189c3 100644
--- a/src/emu/machine/idehd.c
+++ b/src/emu/machine/idehd.c
@@ -80,34 +80,46 @@ enum
 ide_device_interface::ide_device_interface(const machine_config &mconfig, device_t &device) :
 	m_master_password(NULL),
 	m_user_password(NULL),
-	m_csel(0),
-	m_dasp(0),
 	m_irq_handler(device),
 	m_dmarq_handler(device)
 {
 }
 
-void ide_device_interface::set_irq(int state)
+ide_mass_storage_device::ide_mass_storage_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock,const char *shortname, const char *source)
+	: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+	ide_device_interface(mconfig, *this),
+	device_slot_card_interface(mconfig, *this),
+	m_csel(0),
+	m_dasp(0)
+{
+}
+
+void ide_mass_storage_device::set_irq(int state)
 {
 	if (state == ASSERT_LINE)
 		LOG(("IDE interrupt assert\n"));
 	else
 		LOG(("IDE interrupt clear\n"));
 
+	m_interrupt_pending = state;
+
 	/* signal an interrupt */
 	m_irq_handler(state);
 }
 
-void ide_device_interface::set_dmarq(int state)
+void ide_mass_storage_device::set_dmarq(int state)
 {
 	m_dmarq_handler(state);
 }
 
-ide_mass_storage_device::ide_mass_storage_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock,const char *shortname, const char *source)
-	: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
-	ide_device_interface(mconfig, *this),
-	device_slot_card_interface(mconfig, *this)
+WRITE_LINE_MEMBER( ide_mass_storage_device::write_csel )
 {
+	m_csel = state;
+}
+
+WRITE_LINE_MEMBER( ide_mass_storage_device::write_dasp )
+{
+	m_dasp = state;
 }
 
 /*************************************
@@ -364,13 +376,6 @@ void ide_mass_storage_device::device_reset()
 	set_dmarq(CLEAR_LINE);
 }
 
-void ide_mass_storage_device::set_irq(int state)
-{
-	ide_device_interface::set_irq(state);
-
-	m_interrupt_pending = state;
-}
-
 void ide_mass_storage_device::signal_delayed_interrupt(attotime time, int buffer_ready)
 {
 	/* clear buffer ready and set the busy flag */
diff --git a/src/emu/machine/idehd.h b/src/emu/machine/idehd.h
index 29393f096d2..fb3f722a104 100644
--- a/src/emu/machine/idehd.h
+++ b/src/emu/machine/idehd.h
@@ -24,15 +24,15 @@ class ide_device_interface
 public:
 	ide_device_interface(const machine_config &mconfig, device_t &device);
 
-	virtual void set_irq(int state);
-	virtual void set_dmarq(int state);
-
 	virtual UINT16 read_dma() = 0;
 	virtual DECLARE_READ16_MEMBER(read_cs0) = 0;
 	virtual DECLARE_READ16_MEMBER(read_cs1) = 0;
+
 	virtual void write_dma(UINT16 data) = 0;
 	virtual DECLARE_WRITE16_MEMBER(write_cs0) = 0;
 	virtual DECLARE_WRITE16_MEMBER(write_cs1) = 0;
+	virtual DECLARE_WRITE_LINE_MEMBER(write_csel) = 0;
+	virtual DECLARE_WRITE_LINE_MEMBER(write_dasp) = 0;
 
 	virtual UINT8 *get_features() = 0;
 
@@ -41,9 +41,6 @@ public:
 	const UINT8 *   m_master_password;
 	const UINT8 *   m_user_password;
 
-	int m_csel;
-	int m_dasp;
-
 	devcb2_write_line m_irq_handler;
 	devcb2_write_line m_dmarq_handler;
 };
@@ -55,16 +52,15 @@ class ide_mass_storage_device : public device_t,
 public:
 	ide_mass_storage_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock,const char *shortname = "", const char *source = __FILE__);
 
-	virtual int  read_sector(UINT32 lba, void *buffer) = 0;
-	virtual int  write_sector(UINT32 lba, const void *buffer) = 0;
-
-	virtual void set_irq(int state);
 	virtual UINT16 read_dma();
 	virtual DECLARE_READ16_MEMBER(read_cs0);
 	virtual DECLARE_READ16_MEMBER(read_cs1);
+
 	virtual void write_dma(UINT16 data);
 	virtual DECLARE_WRITE16_MEMBER(write_cs0);
 	virtual DECLARE_WRITE16_MEMBER(write_cs1);
+	virtual DECLARE_WRITE_LINE_MEMBER(write_csel);
+	virtual DECLARE_WRITE_LINE_MEMBER(write_dasp);
 
 	virtual UINT8 *get_features() { return m_features; }
 	
@@ -73,9 +69,14 @@ protected:
 	virtual void device_reset();
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
 
+	virtual int read_sector(UINT32 lba, void *buffer) = 0;
+	virtual int write_sector(UINT32 lba, const void *buffer) = 0;
 	virtual bool is_ready() = 0;
 	virtual void read_key(UINT8 key[]) = 0;
 
+	void set_irq(int state);
+	void set_dmarq(int state);
+
 	UINT8           m_gnetreadlock;
 
 	UINT8           m_features[IDE_DISK_SECTOR_SIZE];
@@ -99,6 +100,9 @@ private:
 	void read_buffer_empty();
 	void write_buffer_full();
 
+	int m_csel;
+	int m_dasp;
+
 	int             m_cur_drive;
 	UINT16          m_cur_cylinder;
 	UINT8           m_cur_sector;