diff --git a/src/mame/drivers/altos8600.cpp b/src/mame/drivers/altos8600.cpp
index e9a68e48d9a..f0e4cc3e814 100644
--- a/src/mame/drivers/altos8600.cpp
+++ b/src/mame/drivers/altos8600.cpp
@@ -464,9 +464,8 @@ WRITE8_MEMBER(altos8600_state::romport_w)
 			break;
 		case 5:
 			m_romport[2] = data;
-			if(BIT(data, 3))
-				m_fdc->soft_reset();
-			m_fdc->dden_w(!BIT(data, 2) ? true : false);
+			m_fdc->mr_w(!BIT(data, 3));
+			m_fdc->dden_w(!BIT(data, 2));
 			m_dmamplex = (data >> 4) & 3;
 			break;
 		case 7:
diff --git a/src/mame/drivers/lb186.cpp b/src/mame/drivers/lb186.cpp
index eea822f8c1a..92ddb98e54e 100644
--- a/src/mame/drivers/lb186.cpp
+++ b/src/mame/drivers/lb186.cpp
@@ -26,10 +26,8 @@ public:
 	void lb186(machine_config &config);
 
 private:
-	DECLARE_WRITE8_MEMBER(sio_out_w);
-	DECLARE_WRITE8_MEMBER(drive_sel_w);
-	DECLARE_READ8_MEMBER(scsi_dack_r);
-	DECLARE_WRITE8_MEMBER(scsi_dack_w);
+	void sio_out_w(uint8_t data);
+	void drive_sel_w(uint8_t data);
 	DECLARE_FLOPPY_FORMATS( floppy_formats );
 	static void ncr5380(device_t *device);
 	void lb186_io(address_map &map);
@@ -40,24 +38,13 @@ private:
 	required_device<ncr5380n_device> m_scsi;
 };
 
-WRITE8_MEMBER(lb186_state::scsi_dack_w)
+void lb186_state::sio_out_w(uint8_t data)
 {
-	m_scsi->dma_w(data);
-}
-
-READ8_MEMBER(lb186_state::scsi_dack_r)
-{
-	return m_scsi->dma_r();
-}
-
-WRITE8_MEMBER(lb186_state::sio_out_w)
-{
-	if(!BIT(data, 5))
-		m_fdc->soft_reset();
+	m_fdc->mr_w(BIT(data, 5));
 	m_maincpu->tmrin1_w(BIT(data, 3) ? ASSERT_LINE : CLEAR_LINE);
 }
 
-WRITE8_MEMBER(lb186_state::drive_sel_w)
+void lb186_state::drive_sel_w(uint8_t data)
 {
 	m_fdc->dden_w(BIT(data, 5));
 
@@ -103,7 +90,7 @@ void lb186_state::lb186_io(address_map &map)
 	map(0x1000, 0x101f).rw("duart", FUNC(scn2681_device::read), FUNC(scn2681_device::write)).umask16(0x00ff);
 	map(0x1080, 0x108f).rw(m_scsi, FUNC(ncr5380n_device::read), FUNC(ncr5380n_device::write)).umask16(0x00ff);
 	map(0x1100, 0x1107).rw(m_fdc, FUNC(wd1772_device::read), FUNC(wd1772_device::write)).umask16(0x00ff);
-	map(0x1180, 0x1180).rw(FUNC(lb186_state::scsi_dack_r), FUNC(lb186_state::scsi_dack_w));
+	map(0x1180, 0x1180).rw(m_scsi, FUNC(ncr5380n_device::dma_r), FUNC(ncr5380n_device::dma_w));
 	map(0x1200, 0x1200).w(FUNC(lb186_state::drive_sel_w));
 }
 
diff --git a/src/mame/drivers/ngen.cpp b/src/mame/drivers/ngen.cpp
index c250242658d..85c65c2855d 100644
--- a/src/mame/drivers/ngen.cpp
+++ b/src/mame/drivers/ngen.cpp
@@ -617,10 +617,9 @@ WRITE_LINE_MEMBER(ngen_state::fdc_drq_w)
 WRITE8_MEMBER(ngen_state::fdc_control_w)
 {
 	m_fdc->set_floppy(m_fd0->get_device());
-	m_fd0->get_device()->mon_w(~data & 0x04);
-	m_fd0->get_device()->ss_w(data & 0x20);
-	if(~data & 0x80)
-		m_fdc->soft_reset();
+	m_fd0->get_device()->mon_w(!BIT(data, 2));
+	m_fd0->get_device()->ss_w(BIT(data, 5));
+	m_fdc->mr_w(BIT(data, 7));
 }
 
 // Hard disk control register
diff --git a/src/mame/drivers/sbrain.cpp b/src/mame/drivers/sbrain.cpp
index b197ddea568..de2e101d8fc 100644
--- a/src/mame/drivers/sbrain.cpp
+++ b/src/mame/drivers/sbrain.cpp
@@ -345,11 +345,9 @@ void sbrain_state::ppi_pc_w(u8 data)
 		m_keydown &= 2; // ack DR
 
 	m_subcpu->set_input_line(INPUT_LINE_RESET, BIT(data, 3) ? ASSERT_LINE : CLEAR_LINE);
+	m_fdc->mr_w(!BIT(data, 3));
 	if (BIT(data, 3))
-	{
-		m_fdc->soft_reset();
 		disk_select_w(0);
-	}
 	m_subcpu->set_input_line(Z80_INPUT_LINE_BUSRQ, BIT(data, 5) ? ASSERT_LINE : CLEAR_LINE); // ignored in z80.cpp
 	m_busak = BIT(data, 5);
 }
diff --git a/src/mame/machine/bbc.cpp b/src/mame/machine/bbc.cpp
index eb8580f5499..2599ad3bd1f 100644
--- a/src/mame/machine/bbc.cpp
+++ b/src/mame/machine/bbc.cpp
@@ -1118,7 +1118,7 @@ WRITE8_MEMBER(bbc_state::bbcbp_drive_control_w)
 	// bit 4: interrupt enable (S5 wire link not fitted)
 
 	// bit 5: reset
-	if (!BIT(data, 5)) m_wd1770->soft_reset();
+	m_wd1770->mr_w(BIT(data, 5));
 }
 
 /*
@@ -1152,7 +1152,7 @@ WRITE8_MEMBER(bbc_state::bbcm_drive_control_w)
 	m_wd1770->dden_w(BIT(data, 5));
 
 	// bit 2: reset
-	if (!BIT(data, 2)) m_wd1770->soft_reset();
+	m_wd1770->mr_w(BIT(data, 2));
 }
 
 WRITE8_MEMBER(bbc_state::bbcmc_drive_control_w)
@@ -1172,7 +1172,7 @@ WRITE8_MEMBER(bbc_state::bbcmc_drive_control_w)
 	m_wd1772->dden_w(BIT(data, 5));
 
 	// bit 2: reset
-	if (!BIT(data, 2)) m_wd1772->soft_reset();
+	m_wd1772->mr_w(BIT(data, 2));
 }
 
 /**************************************