diff --git a/src/emu/machine/ins8250.c b/src/emu/machine/ins8250.c
index db32a7dac9b..42982aa00c3 100644
--- a/src/emu/machine/ins8250.c
+++ b/src/emu/machine/ins8250.c
@@ -613,7 +613,7 @@ void ns16550_device::set_fcr(UINT8 data)
 	}
 	m_rintlvl = bytes_per_int[(data>>6)&3];
 	m_regs.iir |= 0xc0;
-	m_regs.fcr = data & ~0xc9;
+	m_regs.fcr = data & 0xc9;
 	m_regs.lsr |= 0x20;
 	trigger_int(COM_INT_PENDING_TRANSMITTER_HOLDING_REGISTER_EMPTY);
 }
diff --git a/src/emu/machine/microtch.c b/src/emu/machine/microtch.c
index 1831d854e86..27659bb8977 100644
--- a/src/emu/machine/microtch.c
+++ b/src/emu/machine/microtch.c
@@ -16,12 +16,20 @@
 const device_type MICROTOUCH = &device_creator<microtouch_device>;
 
 microtouch_device::microtouch_device(const machine_config &mconfig, device_type type, const char* name, const char *tag, device_t *owner, UINT32 clock)
-	: device_t(mconfig, type, name, tag, owner, clock)
+	: device_t(mconfig, type, name, tag, owner, clock),
+	m_out_tx_func(*this),
+	m_touch(*this, "TOUCH"),
+	m_touchx(*this, "TOUCH_X"),
+	m_touchy(*this, "TOUCH_Y")
 {
 }
 
 microtouch_device::microtouch_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: device_t(mconfig, MICROTOUCH, "Microtouch Touchscreen", tag, owner, clock)
+	: device_t(mconfig, MICROTOUCH, "Microtouch Touchscreen", tag, owner, clock),
+	m_out_tx_func(*this),
+	m_touch(*this, "TOUCH"),
+	m_touchx(*this, "TOUCH_X"),
+	m_touchy(*this, "TOUCH_Y")
 {
 }
 
@@ -82,10 +90,10 @@ void microtouch_device::send_format_decimal_packet(int x, int y)
 
 void microtouch_device::send_touch_packet()
 {
-	int tx = ioport("TOUCH_X")->read();
-	int ty = ioport("TOUCH_Y")->read();
+	int tx = m_touchx->read();
+	int ty = m_touchy->read();
 
-	if ( m_out_touch_cb == NULL ||
+	if ( m_out_touch_cb.isnull() ||
 			m_out_touch_cb( &tx, &ty ) != 0 )
 	{
 		ty = 0x4000 - ty;
@@ -127,7 +135,7 @@ void microtouch_device::device_timer(emu_timer &timer, device_timer_id id, int p
 	}
 
 	// send format tablet packet
-	if ( ioport("TOUCH")->read() & 0x01 )
+	if (m_touch->read())
 	{
 		send_touch_packet();
 	}
@@ -151,18 +159,6 @@ void microtouch_device::device_timer(emu_timer &timer, device_timer_id id, int p
 	}
 }
 
-void microtouch_device::device_config_complete()
-{
-	const microtouch_interface *intf = reinterpret_cast<const microtouch_interface *>(static_config());
-	if(intf != NULL)
-		*static_cast<microtouch_interface *>(this) = *intf;
-	else
-	{
-		memset(&m_out_tx_cb, 0, sizeof(m_out_tx_cb));
-		memset(&m_out_touch_cb, 0, sizeof(m_out_touch_cb));
-	}
-}
-
 void microtouch_device::device_start()
 {
 	memset(m_rx_buffer, 0, sizeof(m_rx_buffer));
@@ -194,7 +190,7 @@ void microtouch_device::device_start()
 	save_item(NAME(m_tx_buffer_ptr));
 	save_item(NAME(m_format));
 	save_item(NAME(m_mode));
-	m_out_tx_func.resolve(m_out_tx_cb, *this);
+	m_out_tx_func.resolve_safe();
 }
 
 
@@ -288,30 +284,18 @@ const device_type MICROTOUCH_SERIAL = &device_creator<microtouch_serial_device>;
 
 microtouch_serial_device::microtouch_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 	: microtouch_device(mconfig, MICROTOUCH_SERIAL, "Microtouch Serial Touchscreen", tag, owner, clock),
-		device_serial_interface(mconfig, *this)
+	device_serial_interface(mconfig, *this),
+	m_out_stx_func(*this)
 {
 }
 
-void microtouch_serial_device::device_config_complete()
-{
-	const microtouch_serial_interface *intf = reinterpret_cast<const microtouch_serial_interface *>(static_config());
-	if(intf != NULL)
-		*static_cast<microtouch_serial_interface *>(this) = *intf;
-	else
-	{
-		memset(&m_out_stx_cb, 0, sizeof(m_out_stx_cb));
-	}
-	memset(&(microtouch_interface::m_out_tx_cb), 0, sizeof(microtouch_interface::m_out_tx_cb));
-	memset(&m_out_touch_cb, 0, sizeof(m_out_touch_cb));
-}
-
 void microtouch_serial_device::device_start()
 {
 	microtouch_device::device_start();
 	set_data_frame(8, 1, SERIAL_PARITY_NONE); //8N1?
 	set_tra_rate(clock());
 	set_rcv_rate(clock());
-	m_out_stx_func.resolve(m_out_stx_cb, *this);
+	m_out_stx_func.resolve_safe();
 	m_output_valid = false;
 
 	save_item(NAME(m_output_valid));
diff --git a/src/emu/machine/microtch.h b/src/emu/machine/microtch.h
index 122f50ff475..988c4e712b4 100644
--- a/src/emu/machine/microtch.h
+++ b/src/emu/machine/microtch.h
@@ -3,31 +3,25 @@
 
 #include "emu.h"
 
-typedef int (*microtouch_touch_func)(int *touch_x, int *touch_y);
-#define MICROTOUCH_TOUCH(name) int name(int *touch_x, int *touch_y)
-
-struct microtouch_interface
-{
-	devcb_write8            m_out_tx_cb;
-	microtouch_touch_func   m_out_touch_cb;
-};
 
 class microtouch_device :
-		public device_t,
-		public microtouch_interface
+		public device_t
 {
 public:
 	microtouch_device(const machine_config &mconfig, device_type type, const char* name, const char *tag, device_t *owner, UINT32 clock);
 	microtouch_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	template<class _Object> static devcb2_base &static_set_tx_callback(device_t &device, _Object object) { return downcast<microtouch_device &>(device).m_out_tx_func.set_callback(object); }
 
 	virtual ioport_constructor device_input_ports() const;
 	DECLARE_WRITE8_MEMBER(rx);
 	DECLARE_INPUT_CHANGED_MEMBER(touch);
+
+	typedef delegate<int (int *, int *)> touch_cb;
+	static void static_set_touch_callback(device_t &device, touch_cb object) { downcast<microtouch_device &>(device).m_out_touch_cb = object; }
 protected:
 	virtual void device_start();
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
-	virtual void device_config_complete();
-	virtual void tx(UINT8 data) { m_out_tx_func(0, data); }
+	virtual void tx(UINT8 data) { m_out_tx_func(data); }
 	emu_timer*  m_timer;
 private:
 	int check_command( const char* commandtocheck, int command_len, UINT8* command_data );
@@ -58,32 +52,31 @@ private:
 	int         m_last_touch_state;
 	int         m_last_x;
 	int         m_last_y;
-	devcb_resolved_write8 m_out_tx_func;
+	devcb2_write8 m_out_tx_func;
+	touch_cb m_out_touch_cb;
+	required_ioport m_touch;
+	required_ioport m_touchx;
+	required_ioport m_touchy;
 };
 
 extern const device_type MICROTOUCH;
 
-#define MCFG_MICROTOUCH_ADD(_tag, _intrf) \
+#define MCFG_MICROTOUCH_ADD(_tag, _devcb) \
 	MCFG_DEVICE_ADD(_tag, MICROTOUCH, 0) \
-	MCFG_DEVICE_CONFIG(_intrf)
+	devcb = &microtouch_serial_device::static_set_tx_callback(*device, DEVCB2_##_devcb);
 
-struct microtouch_serial_interface
-{
-	devcb_write_line m_out_stx_cb;
-};
 
 class microtouch_serial_device
 	: public microtouch_device,
-		public device_serial_interface,
-		public microtouch_serial_interface
+		public device_serial_interface
 {
 public:
 	microtouch_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	template<class _Object> static devcb2_base &static_set_stx_callback(device_t &device, _Object object) { return downcast<microtouch_serial_device &>(device).m_out_stx_func.set_callback(object); }
 
 	DECLARE_WRITE_LINE_MEMBER(rx) { check_for_start(state); }
 protected:
 	virtual void device_start();
-	virtual void device_config_complete();
 	virtual void tx(UINT8 data);
 	virtual void input_callback(UINT8 state) { m_input_state = state; }
 	virtual void tra_callback();
@@ -92,13 +85,17 @@ protected:
 private:
 	bool m_output_valid;
 	UINT8 m_output;
-	devcb_resolved_write_line m_out_stx_func;
+	devcb2_write_line m_out_stx_func;
 };
 
 extern const device_type MICROTOUCH_SERIAL;
 
-#define MCFG_MICROTOUCH_SERIAL_ADD(_tag, _intrf, _clock) \
+#define MCFG_MICROTOUCH_SERIAL_ADD(_tag, _clock, _devcb) \
 	MCFG_DEVICE_ADD(_tag, MICROTOUCH_SERIAL, _clock) \
-	MCFG_DEVICE_CONFIG(_intrf)
+	devcb = &microtouch_serial_device::static_set_stx_callback(*device, DEVCB2_##_devcb);
+
+#define MCFG_MICROTOUCH_TOUCH_CB(_class, _touch_cb) \
+	microtouch_device::static_set_touch_callback(*device, microtouch_device::touch_cb(FUNC(_class::_touch_cb), (_class *)owner));
+
 
 #endif //_MICROTOUCH_H
diff --git a/src/mame/drivers/adp.c b/src/mame/drivers/adp.c
index b48bc187089..34e193c33c7 100644
--- a/src/mame/drivers/adp.c
+++ b/src/mame/drivers/adp.c
@@ -294,12 +294,6 @@ static UINT8 duart_input( device_t *device )
 	return device->machine().root_device().ioport("DSW1")->read();
 }
 
-static const microtouch_interface adb_microtouch_config =
-{
-	DEVCB_DRIVER_MEMBER(adp_state, microtouch_tx),
-	NULL
-};
-
 MACHINE_START_MEMBER(adp_state,skattv)
 {
 	m_duart = machine().device("duart68681");
@@ -667,7 +661,7 @@ static MACHINE_CONFIG_START( quickjac, adp_state )
 	MCFG_MACHINE_RESET_OVERRIDE(adp_state,skattv)
 
 	MCFG_DUART68681_ADD( "duart68681", XTAL_8_664MHz / 2, skattv_duart68681_config )
-	MCFG_MICROTOUCH_ADD( "microtouch", adb_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(adp_state, microtouch_tx) )
 
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
@@ -699,7 +693,7 @@ static MACHINE_CONFIG_START( skattv, adp_state )
 	MCFG_MACHINE_RESET_OVERRIDE(adp_state,skattv)
 
 	MCFG_DUART68681_ADD( "duart68681", XTAL_8_664MHz / 2, skattv_duart68681_config )
-	MCFG_MICROTOUCH_ADD( "microtouch", adb_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(adp_state, microtouch_tx) )
 
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
@@ -727,7 +721,7 @@ static MACHINE_CONFIG_START( backgamn, adp_state )
 	MCFG_CPU_PROGRAM_MAP(backgamn_mem)
 
 	MCFG_DUART68681_ADD( "duart68681", XTAL_8_664MHz / 2, skattv_duart68681_config )
-	MCFG_MICROTOUCH_ADD( "microtouch", adb_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(adp_state, microtouch_tx) )
 
 	MCFG_MACHINE_START_OVERRIDE(adp_state,skattv)
 	MCFG_MACHINE_RESET_OVERRIDE(adp_state,skattv)
diff --git a/src/mame/drivers/cd32.c b/src/mame/drivers/cd32.c
index d44eb509580..d469151e008 100644
--- a/src/mame/drivers/cd32.c
+++ b/src/mame/drivers/cd32.c
@@ -769,12 +769,6 @@ static const i2cmem_interface i2cmem_interface =
 	I2CMEM_SLAVE_ADDRESS, NVRAM_PAGE_SIZE, NVRAM_SIZE
 };
 
-static const microtouch_interface cd32_microtouch_config =
-{
-	DEVCB_DRIVER_MEMBER(cd32_state, microtouch_tx),
-	NULL
-};
-
 static MACHINE_CONFIG_START( cd32base, cd32_state )
 
 	/* basic machine hardware */
@@ -817,7 +811,7 @@ static MACHINE_CONFIG_START( cd32base, cd32_state )
 	MCFG_LEGACY_MOS8520_ADD("cia_0", AMIGA_68EC020_PAL_CLOCK / 10, 0, cia_0_intf)
 	MCFG_LEGACY_MOS8520_ADD("cia_1", AMIGA_68EC020_PAL_CLOCK / 10, 0, cia_1_intf)
 
-	MCFG_MICROTOUCH_ADD( "microtouch", cd32_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(cd32_state, microtouch_tx) )
 
 	/* fdc */
 	MCFG_AMIGA_FDC_ADD("fdc", AMIGA_68000_NTSC_CLOCK)
diff --git a/src/mame/drivers/magtouch.c b/src/mame/drivers/magtouch.c
index 2fcac04a6b4..ea622257cd3 100644
--- a/src/mame/drivers/magtouch.c
+++ b/src/mame/drivers/magtouch.c
@@ -115,11 +115,6 @@ static const ins8250_interface magtouch_com0_interface =
 	DEVCB_NULL
 };
 
-static const microtouch_serial_interface magtouch_microtouch_interface =
-{
-	DEVCB_DEVICE_LINE_MEMBER("ns16450_0", ins8250_uart_device, rx_w)
-};
-
 /*************************************
  *
  *  ROM banking
@@ -181,8 +176,6 @@ void magtouch_state::machine_start()
 
 	membank("rombank")->configure_entries(0, 0x80, memregion("game_prg")->base(), 0x8000 );
 	membank("rombank")->set_entry(0);
-
-//  microtouch_init(machine(), magtouch_microtouch_tx_callback, NULL);
 }
 
 static MACHINE_CONFIG_START( magtouch, magtouch_state )
@@ -200,7 +193,7 @@ static MACHINE_CONFIG_START( magtouch, magtouch_state )
 
 	MCFG_FRAGMENT_ADD( pcat_common )
 	MCFG_NS16450_ADD( "ns16450_0", magtouch_com0_interface, XTAL_1_8432MHz )
-	MCFG_MICROTOUCH_SERIAL_ADD( "microtouch", magtouch_microtouch_interface, 9600 ) // rate?
+	MCFG_MICROTOUCH_SERIAL_ADD( "microtouch", 9600, DEVWRITELINE("ns16450_0", ins8250_uart_device, rx_w) ) // rate?
 MACHINE_CONFIG_END
 
 
diff --git a/src/mame/drivers/meritm.c b/src/mame/drivers/meritm.c
index c30abcaa9dd..dfe50a110ad 100644
--- a/src/mame/drivers/meritm.c
+++ b/src/mame/drivers/meritm.c
@@ -161,7 +161,7 @@ Not all regional versions are available for each Megatouch series
 #include "video/v9938.h"
 #include "machine/i8255.h"
 #include "machine/z80pio.h"
-#include "machine/pc16552d.h"
+#include "machine/ins8250.h"
 #include "machine/microtch.h"
 #include "machine/nvram.h"
 
@@ -188,7 +188,8 @@ public:
 			m_v9938_0(*this, "v9938_0"),
 			m_v9938_1(*this, "v9938_1"),
 			m_microtouch(*this, "microtouch") ,
-		m_maincpu(*this, "maincpu") { }
+			m_uart(*this, "ns16550"),
+			m_maincpu(*this, "maincpu") { }
 
 	DECLARE_WRITE8_MEMBER(microtouch_tx);
 	UINT8* m_ram;
@@ -205,7 +206,8 @@ public:
 	ds1204_t m_ds1204;
 	required_device<v9938_device> m_v9938_0;
 	required_device<v9938_device> m_v9938_1;
-	required_device<microtouch_device> m_microtouch;
+	optional_device<microtouch_serial_device> m_microtouch;
+	optional_device<ns16550_device> m_uart;
 	DECLARE_WRITE8_MEMBER(meritm_crt250_bank_w);
 	DECLARE_WRITE8_MEMBER(meritm_psd_a15_w);
 	DECLARE_WRITE8_MEMBER(meritm_bank_w);
@@ -251,6 +253,7 @@ public:
 	void ds1204_init(const UINT8* key, const UINT8* nvram);
 	void meritm_crt250_switch_banks(  );
 	void meritm_switch_banks(  );
+	int meritm_touch_coord_transform(int *touch_x, int *touch_y);
 	UINT8 binary_to_BCD(UINT8 data);
 	DECLARE_WRITE_LINE_MEMBER(meritm_vdp0_interrupt);
 	DECLARE_WRITE_LINE_MEMBER(meritm_vdp1_interrupt);
@@ -259,7 +262,7 @@ public:
 
 
 #define SYSTEM_CLK  21470000
-#define UART_CLK    XTAL_18_432MHz
+#define UART_CLK    XTAL_1_8432MHz // standard 8250 clock
 
 
 
@@ -377,28 +380,26 @@ void meritm_state::ds1204_init(const UINT8* key, const UINT8* nvram)
 
 /*************************************
  *
- *  Microtouch <-> pc16650 interface
+ *  Microtouch <-> pc16550 interface
  *
  *************************************/
 
-static void pc16650d_tx_callback(running_machine &machine, int channel, int count, UINT8* data)
+static const ins8250_interface meritm_ns16550_interface =
 {
-	meritm_state *state = machine.driver_data<meritm_state>();
-	for(int i = 0; i < count; i++)
-		state->m_microtouch->rx(machine.driver_data()->generic_space(), 0, data[i]);
-}
-
-WRITE8_MEMBER(meritm_state::microtouch_tx)
-{
-	pc16552d_rx_data(space.machine(), 0, 0, data);
-}
+	DEVCB_DEVICE_LINE_MEMBER("microtouch", microtouch_serial_device, rx),
+	DEVCB_NULL,
+	DEVCB_NULL,
+	DEVCB_NULL,
+	DEVCB_NULL,
+	DEVCB_NULL
+};
 
 /*************************************
  *
  *  Microtouch touch coordinate transformation
  *
  *************************************/
-MICROTOUCH_TOUCH(meritm_touch_coord_transform)
+int meritm_state::meritm_touch_coord_transform(int *touch_x, int *touch_y)
 {
 	int xscr = (int)((double)(*touch_x)/0x4000*544);
 	int yscr = (int)((double)(*touch_y)/0x4000*480);
@@ -423,12 +424,6 @@ MICROTOUCH_TOUCH(meritm_touch_coord_transform)
 	return 1;
 }
 
-static const microtouch_interface meritm_microtouch_config =
-{
-	DEVCB_DRIVER_MEMBER(meritm_state, microtouch_tx),
-	meritm_touch_coord_transform
-};
-
 /*************************************
  *
  *  Video
@@ -698,7 +693,7 @@ static ADDRESS_MAP_START( meritm_crt250_crt258_io_map, AS_IO, 8, meritm_state )
 	AM_RANGE(0x30, 0x33) AM_DEVREADWRITE("ppi8255", i8255_device, read, write)
 	AM_RANGE(0x40, 0x43) AM_DEVREADWRITE("z80pio_0", z80pio_device, read, write)
 	AM_RANGE(0x50, 0x53) AM_DEVREADWRITE("z80pio_1", z80pio_device, read, write)
-	AM_RANGE(0x60, 0x67) AM_READWRITE_LEGACY(pc16552d_0_r,pc16552d_0_w)
+	AM_RANGE(0x60, 0x67) AM_DEVREADWRITE("ns16550", ns16550_device, ins8250_r, ins8250_w)
 	AM_RANGE(0x80, 0x80) AM_DEVREAD("aysnd", ay8910_device, data_r)
 	AM_RANGE(0x80, 0x81) AM_DEVWRITE("aysnd", ay8910_device, address_data_w)
 	AM_RANGE(0xff, 0xff) AM_WRITE(meritm_crt250_bank_w)
@@ -719,7 +714,7 @@ static ADDRESS_MAP_START( meritm_io_map, AS_IO, 8, meritm_state )
 	AM_RANGE(0x30, 0x33) AM_DEVREADWRITE("ppi8255", i8255_device, read, write)
 	AM_RANGE(0x40, 0x43) AM_DEVREADWRITE("z80pio_0", z80pio_device, read, write)
 	AM_RANGE(0x50, 0x53) AM_DEVREADWRITE("z80pio_1", z80pio_device, read, write)
-	AM_RANGE(0x60, 0x67) AM_READWRITE_LEGACY(pc16552d_0_r,pc16552d_0_w)
+	AM_RANGE(0x60, 0x67) AM_DEVREADWRITE("ns16550", ns16550_device, ins8250_r, ins8250_w)
 	AM_RANGE(0x80, 0x80) AM_DEVREAD("aysnd", ay8910_device, data_r)
 	AM_RANGE(0x80, 0x81) AM_DEVWRITE("aysnd", ay8910_device, address_data_w)
 	AM_RANGE(0xff, 0xff) AM_WRITE(meritm_bank_w)
@@ -1129,7 +1124,6 @@ MACHINE_START_MEMBER(meritm_state,meritm_crt250_questions)
 MACHINE_START_MEMBER(meritm_state,meritm_crt250_crt252_crt258)
 {
 	MACHINE_START_CALL_MEMBER(meritm_crt250_questions);
-	pc16552d_init(machine(), 0, UART_CLK, NULL, pc16650d_tx_callback);
 }
 
 MACHINE_START_MEMBER(meritm_state,meritm_crt260)
@@ -1144,7 +1138,6 @@ MACHINE_START_MEMBER(meritm_state,meritm_crt260)
 	m_psd_a15 = 0;
 	meritm_switch_banks();
 	MACHINE_START_CALL_MEMBER(merit_common);
-	pc16552d_init(machine(), 0, UART_CLK, NULL, pc16650d_tx_callback);
 	save_item(NAME(m_bank));
 	save_item(NAME(m_psd_a15));
 	save_pointer(NAME(m_ram), 0x8000);
@@ -1215,8 +1208,6 @@ static MACHINE_CONFIG_START( meritm_crt250, meritm_state )
 	MCFG_SOUND_ADD("aysnd", AY8910, SYSTEM_CLK/12)
 	MCFG_SOUND_CONFIG(ay8910_config)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
-
-	MCFG_MICROTOUCH_ADD("microtouch", meritm_microtouch_config)
 MACHINE_CONFIG_END
 
 static MACHINE_CONFIG_DERIVED( meritm_crt250_questions, meritm_crt250 )
@@ -1229,6 +1220,10 @@ static MACHINE_CONFIG_DERIVED( meritm_crt250_crt252_crt258, meritm_crt250_questi
 	MCFG_CPU_MODIFY("maincpu")
 	MCFG_CPU_IO_MAP(meritm_crt250_crt258_io_map)
 	MCFG_MACHINE_START_OVERRIDE(meritm_state,meritm_crt250_crt252_crt258)
+
+	MCFG_NS16550_ADD("ns16550", meritm_ns16550_interface, UART_CLK)
+	MCFG_MICROTOUCH_SERIAL_ADD("microtouch", 9600, DEVWRITELINE("ns16550", ins8250_uart_device, rx_w))
+	MCFG_MICROTOUCH_TOUCH_CB(meritm_state, meritm_touch_coord_transform)
 MACHINE_CONFIG_END
 
 static MACHINE_CONFIG_DERIVED( meritm_crt260, meritm_crt250 )
@@ -1242,6 +1237,9 @@ static MACHINE_CONFIG_DERIVED( meritm_crt260, meritm_crt250 )
 	MCFG_WATCHDOG_TIME_INIT(attotime::from_msec(1200))  // DS1232, TD connected to VCC
 	MCFG_MACHINE_START_OVERRIDE(meritm_state,meritm_crt260)
 
+	MCFG_NS16550_ADD("ns16550", meritm_ns16550_interface, UART_CLK)
+	MCFG_MICROTOUCH_SERIAL_ADD("microtouch", 9600, DEVWRITELINE("ns16550", ins8250_uart_device, rx_w))
+	MCFG_MICROTOUCH_TOUCH_CB(meritm_state, meritm_touch_coord_transform)
 MACHINE_CONFIG_END
 
 
diff --git a/src/mame/drivers/pcat_nit.c b/src/mame/drivers/pcat_nit.c
index ca3396128e8..bff198114e2 100644
--- a/src/mame/drivers/pcat_nit.c
+++ b/src/mame/drivers/pcat_nit.c
@@ -101,45 +101,22 @@ public:
 	required_device<ns16450_device> m_uart;
 	required_device<microtouch_serial_device> m_microtouch;
 
-	DECLARE_WRITE_LINE_MEMBER(microtouch_out);
-	DECLARE_WRITE_LINE_MEMBER(microtouch_in);
 	DECLARE_WRITE8_MEMBER(pcat_nit_rombank_w);
 	DECLARE_READ8_MEMBER(pcat_nit_io_r);
-	DECLARE_WRITE_LINE_MEMBER(at_com_interrupt_1);
 	DECLARE_DRIVER_INIT(pcat_nit);
 	virtual void machine_start();
 };
 
-WRITE_LINE_MEMBER(pcat_nit_state::microtouch_out)
-{
-	m_microtouch->rx(state);
-}
-
-WRITE_LINE_MEMBER(pcat_nit_state::microtouch_in)
-{
-	m_uart->rx_w(state);
-}
-
-WRITE_LINE_MEMBER(pcat_nit_state::at_com_interrupt_1)
-{
-	m_pic8259_1->ir4_w(state);
-}
-
 static const ins8250_interface pcat_nit_com0_interface =
 {
-	DEVCB_DRIVER_LINE_MEMBER(pcat_nit_state, microtouch_out),
+	DEVCB_DEVICE_LINE_MEMBER("microtouch", microtouch_serial_device, rx),
 	DEVCB_NULL,
 	DEVCB_NULL,
-	DEVCB_DRIVER_LINE_MEMBER(pcat_nit_state,at_com_interrupt_1),
+	DEVCB_DEVICE_LINE_MEMBER("pic8259_1", pic8259_device, ir4_w),
 	DEVCB_NULL,
 	DEVCB_NULL
 };
 
-static const microtouch_serial_interface pcat_nit_microtouch_interface =
-{
-	DEVCB_DRIVER_LINE_MEMBER(pcat_nit_state, microtouch_in)
-};
-
 /*************************************
  *
  *  ROM banking
@@ -244,10 +221,9 @@ static MACHINE_CONFIG_START( pcat_nit, pcat_nit_state )
 	MCFG_SCREEN_REFRESH_RATE(60)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
 
-//  MCFG_FRAGMENT_ADD( at_kbdc8042 )
 	MCFG_FRAGMENT_ADD( pcat_common )
 	MCFG_NS16450_ADD( "ns16450_0", pcat_nit_com0_interface, XTAL_1_8432MHz )
-	MCFG_MICROTOUCH_SERIAL_ADD( "microtouch", pcat_nit_microtouch_interface, 9600 ) // rate?
+	MCFG_MICROTOUCH_SERIAL_ADD( "microtouch", 9600, DEVWRITELINE("ns16450_0", ins8250_uart_device, rx_w) ) // rate?
 
 	MCFG_NVRAM_ADD_0FILL("nvram")
 MACHINE_CONFIG_END
diff --git a/src/mame/drivers/tmaster.c b/src/mame/drivers/tmaster.c
index 43b114fdd41..0458ed854ca 100644
--- a/src/mame/drivers/tmaster.c
+++ b/src/mame/drivers/tmaster.c
@@ -242,12 +242,6 @@ WRITE8_MEMBER( tmaster_state::microtouch_tx )
 	duart68681_rx_data(m_duart68681, 0, data);
 }
 
-static const microtouch_interface tmaster_microtouch_config =
-{
-	DEVCB_DRIVER_MEMBER(tmaster_state, microtouch_tx),
-	NULL
-};
-
 /***************************************************************************
 
   DS1644 RTC
@@ -936,7 +930,7 @@ static MACHINE_CONFIG_START( tm3k, tmaster_state )
 	MCFG_MACHINE_RESET_OVERRIDE(tmaster_state,tmaster)
 
 	MCFG_DUART68681_ADD( "duart68681", XTAL_8_664MHz / 2 /*??*/, tmaster_duart68681_config )
-	MCFG_MICROTOUCH_ADD( "microtouch", tmaster_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(tmaster_state, microtouch_tx) )
 
 	MCFG_NVRAM_ADD_0FILL("nvram")
 
diff --git a/src/mame/drivers/vlc.c b/src/mame/drivers/vlc.c
index 04c7e0e142f..1a6d5b2c7eb 100644
--- a/src/mame/drivers/vlc.c
+++ b/src/mame/drivers/vlc.c
@@ -439,11 +439,6 @@ WRITE8_MEMBER( nevada_state::microtouch_tx )
 	duart68681_rx_data(m_duart40_68681, 0, data);
 }
 
-static const microtouch_interface nevada_microtouch_config =
-{
-	DEVCB_DRIVER_MEMBER(nevada_state, microtouch_tx),
-	NULL
-};
 /***************************************************************************/
 static UINT8 duart40_input( device_t *device )
 {
@@ -741,7 +736,7 @@ static MACHINE_CONFIG_START( nevada, nevada_state )
 	MCFG_DUART68681_ADD( "duart18_68681", XTAL_3_6864MHz , nevada_duart18_68681_config )  // UARTA = Modem 1200Baud
 	MCFG_DUART68681_ADD( "duart39_68681", XTAL_3_6864MHz , nevada_duart39_68681_config )  // UARTA = Printer
 	MCFG_DUART68681_ADD( "duart40_68681", XTAL_3_6864MHz , nevada_duart40_68681_config )  // UARTA = Touch , UARTB = Bill Acceptor
-	MCFG_MICROTOUCH_ADD( "microtouch", nevada_microtouch_config )
+	MCFG_MICROTOUCH_ADD( "microtouch", WRITE8(nevada_state, microtouch_tx) )
 	/* devices */
 	MCFG_MSM6242_ADD("rtc", nevada_rtc_intf)