diff --git a/src/mess/drivers/bw12.c b/src/mess/drivers/bw12.c
index 599a2148c47..14b44dc513e 100644
--- a/src/mess/drivers/bw12.c
+++ b/src/mess/drivers/bw12.c
@@ -543,7 +543,7 @@ static Z80DART_INTERFACE( sio_intf )
 
 WRITE_LINE_MEMBER(bw12_state::pit_out0_w)
 {
-	device_t *device = machine().device("DEVCB_DRIVER_LINE_MEMBER(Z80SIO_TAG, bw12_state,pit_out0_w)");
+	device_t *device = machine().device(Z80SIO_TAG);
 	z80dart_txca_w(device, state);
 	z80dart_rxca_w(device, state);
 }
diff --git a/src/mess/drivers/v1050.c b/src/mess/drivers/v1050.c
index 42fc836f082..6aa4ee60b4e 100644
--- a/src/mess/drivers/v1050.c
+++ b/src/mess/drivers/v1050.c
@@ -598,7 +598,7 @@ WRITE_LINE_MEMBER(v1050_state::pic_int_w)
 {
 	if (state == ASSERT_LINE)
 	{
-		execute().set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);
+		machine().device(Z80_TAG)->execute().set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);
 	}
 }
 
diff --git a/src/mess/machine/compis.c b/src/mess/machine/compis.c
index c9b64de3411..6be6779b958 100644
--- a/src/mess/machine/compis.c
+++ b/src/mess/machine/compis.c
@@ -1302,9 +1302,9 @@ static void compis_cpu_init(running_machine &machine)
 	state->m_i186.timer[0].int_timer = machine.scheduler().timer_alloc(timer_expired_delegate(FUNC(compis_state::internal_timer_int),state));
 	state->m_i186.timer[1].int_timer = machine.scheduler().timer_alloc(timer_expired_delegate(FUNC(compis_state::internal_timer_int),state));
 	state->m_i186.timer[2].int_timer = machine.scheduler().timer_alloc(timer_expired_delegate(FUNC(compis_state::internal_timer_int),state));
-	state->m_i186.timer[0].time_timer = machine.scheduler().timer_alloc(timer_expired_delegate());
-	state->m_i186.timer[1].time_timer = machine.scheduler().timer_alloc(timer_expired_delegate());
-	state->m_i186.timer[2].time_timer = machine.scheduler().timer_alloc(timer_expired_delegate());
+	state->m_i186.timer[0].time_timer = machine.scheduler().timer_alloc(FUNC_NULL);
+	state->m_i186.timer[1].time_timer = machine.scheduler().timer_alloc(FUNC_NULL);
+	state->m_i186.timer[2].time_timer = machine.scheduler().timer_alloc(FUNC_NULL);
 	state->m_i186.dma[0].finish_timer = machine.scheduler().timer_alloc(timer_expired_delegate(FUNC(compis_state::dma_timer_callback),state));
 	state->m_i186.dma[1].finish_timer = machine.scheduler().timer_alloc(timer_expired_delegate(FUNC(compis_state::dma_timer_callback),state));
 }