diff --git a/src/emu/machine/ins8250.c b/src/emu/machine/ins8250.c
index 7d5f454ba9e..417e1348627 100644
--- a/src/emu/machine/ins8250.c
+++ b/src/emu/machine/ins8250.c
@@ -109,6 +109,7 @@ static const char * const device_tags[NUM_TYPES] = { "ins8250", "ins8250a", "ns1
 #define COM_LOG(n,m,a) LOG(VERBOSE_COM,n,m,a)
 
 typedef struct {
+	devcb_resolved_write_line	out_intr_func;
 	const ins8250_interface *interface;
 	int	device_type;
 
@@ -215,8 +216,7 @@ static void ins8250_update_interrupt(device_t *device)
 	}
 
 	/* set or clear the int */
-	if (ins8250->interface->interrupt)
-		ins8250->interface->interrupt(device, state);
+	ins8250->out_intr_func(state);
 }
 
 
@@ -549,6 +549,8 @@ static void common_start( device_t *device, int device_type )
 
 	ins8250->interface = (const ins8250_interface*)device->static_config();
 	ins8250->device_type = device_type;
+
+	ins8250->out_intr_func.resolve(ins8250->interface->out_intr_cb, *device);
 }
 
 
diff --git a/src/emu/machine/ins8250.h b/src/emu/machine/ins8250.h
index 408c585a945..ef00e544573 100644
--- a/src/emu/machine/ins8250.h
+++ b/src/emu/machine/ins8250.h
@@ -29,12 +29,10 @@ DECLARE_LEGACY_DEVICE(PC16550D, pc16550d);
     TYPE DEFINITIONS
 ***************************************************************************/
 
-typedef void (*ins8250_interrupt_func)(device_t *device, int state);
 typedef void (*ins8250_transmit_func)(device_t *device, int data);
 typedef void (*ins8250_handshake_out_func)(device_t *device, int data);
 typedef void (*ins8250_refresh_connect_func)(device_t *device);
 
-#define INS8250_INTERRUPT(name)			void name(device_t *device, int state)
 #define INS8250_TRANSMIT(name)			void name(device_t *device, int data)
 #define INS8250_HANDSHAKE_OUT(name)		void name(device_t *device, int data)
 #define INS8250_REFRESH_CONNECT(name)	void name(device_t *device)
@@ -42,7 +40,7 @@ typedef void (*ins8250_refresh_connect_func)(device_t *device);
 typedef struct
 {
 	long clockin;
-	ins8250_interrupt_func			interrupt;
+	devcb_write_line				out_intr_cb;
 
 	ins8250_transmit_func			transmit;
 	ins8250_handshake_out_func		handshake_out;
diff --git a/src/mame/drivers/magtouch.c b/src/mame/drivers/magtouch.c
index 560a0d7a22a..ffdc16b65ef 100644
--- a/src/mame/drivers/magtouch.c
+++ b/src/mame/drivers/magtouch.c
@@ -107,7 +107,7 @@ static INS8250_TRANSMIT( magtouch_com_transmit )
 	microtouch_rx(1, &data8);
 }
 
-static INS8250_INTERRUPT( at_com_interrupt_1 )
+static WRITE_LINE_DEVICE_HANDLER( at_com_interrupt_1 )
 {
 	pic8259_ir4_w(device->machine().device("pic8259_1"), state);
 }
@@ -115,7 +115,7 @@ static INS8250_INTERRUPT( at_com_interrupt_1 )
 static const ins8250_interface magtouch_com0_interface =
 {
 	1843200,
-	at_com_interrupt_1,
+	DEVCB_LINE(at_com_interrupt_1),
 	magtouch_com_transmit,
 	NULL,
 	NULL
diff --git a/src/mame/drivers/pcat_nit.c b/src/mame/drivers/pcat_nit.c
index fa368650bb1..ad3e300b144 100644
--- a/src/mame/drivers/pcat_nit.c
+++ b/src/mame/drivers/pcat_nit.c
@@ -112,7 +112,7 @@ static INS8250_TRANSMIT( pcat_nit_com_transmit )
 	microtouch_rx(1, &data8);
 }
 
-static INS8250_INTERRUPT( at_com_interrupt_1 )
+static WRITE_LINE_DEVICE_HANDLER( at_com_interrupt_1 )
 {
 	pic8259_ir4_w(device->machine().device("pic8259_1"), state);
 }
@@ -120,7 +120,7 @@ static INS8250_INTERRUPT( at_com_interrupt_1 )
 static const ins8250_interface pcat_nit_com0_interface =
 {
 	1843200,
-	at_com_interrupt_1,
+	DEVCB_LINE(at_com_interrupt_1),
 	pcat_nit_com_transmit,
 	NULL,
 	NULL