diff --git a/src/emu/machine/upd765.c b/src/emu/machine/upd765.c
index 2091485641b..685d2b4239a 100644
--- a/src/emu/machine/upd765.c
+++ b/src/emu/machine/upd765.c
@@ -400,6 +400,8 @@ WRITE8_MEMBER(upd765_family_device::fifo_w)
 	switch(main_phase) {
 	case PHASE_CMD: {
 		command[command_pos++] = data;
+		other_irq = false;
+		check_irq();
 		int cmd = check_command();
 		if(cmd == C_INCOMPLETE)
 			break;
@@ -1283,8 +1285,6 @@ void upd765_family_device::start_command(int cmd)
 		break;
 
 	case C_SEEK:
-		other_irq = false;
-		check_irq();
 		seek_start(flopi[command[1] & 3]);
 		main_phase = PHASE_CMD;
 		break;
diff --git a/src/mess/drivers/x68k.c b/src/mess/drivers/x68k.c
index 467bdb33255..e6bc729af16 100644
--- a/src/mess/drivers/x68k.c
+++ b/src/mess/drivers/x68k.c
@@ -705,6 +705,8 @@ WRITE_LINE_MEMBER( x68k_state::fdc_irq )
 		logerror("FDC: IRQ triggered\n");
 		m_maincpu->set_input_line_and_vector(1, ASSERT_LINE, m_current_vector[1]);
 	}
+	else
+		m_maincpu->set_input_line(1, CLEAR_LINE);
 }
 
 WRITE16_MEMBER(x68k_state::x68k_fm_w)