diff --git a/src/emu/machine/atapihle.c b/src/emu/machine/atapihle.c
index ecc6d69e789..2b21252e8fe 100644
--- a/src/emu/machine/atapihle.c
+++ b/src/emu/machine/atapihle.c
@@ -34,29 +34,15 @@ void atapi_hle_device::process_buffer()
 		if (m_buffer_size > ATAPI_BUFFER_LENGTH || m_buffer_size == 0)
 			m_buffer_size = ATAPI_BUFFER_LENGTH;
 
-		// TODO: dma flag
+		if (m_feature & ATAPI_FEATURES_FLAG_OVL)
+		{
+			printf( "ATAPI_FEATURES_FLAG_OVL not supported\n" );
+		}
+
 		switch (phase)
 		{
 		case SCSI_PHASE_DATAOUT:
-			if (m_buffer_size > m_data_size)
-			{
-				m_buffer_size = m_data_size;
-			}
-
-			m_cylinder_low = m_buffer_size & 0xff;
-			m_cylinder_high = m_buffer_size >> 8;
-
-			if (m_buffer_size > 0)
-			{
-				m_status |= IDE_STATUS_DRQ;
-				m_sector_count = 0;
-			}
-			else
-			{
-				m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
-			}
-
-			set_irq(ASSERT_LINE);
+			wait_buffer();
 			break;
 
 		case SCSI_PHASE_DATAIN:
@@ -82,25 +68,7 @@ void atapi_hle_device::process_buffer()
 			m_scsidev_device->WriteData( m_buffer, m_buffer_size );
 			m_data_size -= m_buffer_size;
 
-			if (m_buffer_size > m_data_size)
-			{
-				m_buffer_size = m_data_size;
-			}
-
-			m_cylinder_low = m_buffer_size & 0xff;
-			m_cylinder_high = m_buffer_size >> 8;
-
-			if (m_buffer_size > 0)
-			{
-				m_status |= IDE_STATUS_DRQ;
-				m_sector_count = 0;
-			}
-			else
-			{
-				m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
-			}
-
-			set_irq(ASSERT_LINE);
+			wait_buffer();
 			break;
 		}
 	}
@@ -111,10 +79,14 @@ void atapi_hle_device::fill_buffer()
 	switch (m_command)
 	{
 	case IDE_COMMAND_PACKET:
-		if (m_buffer_size > m_data_size)
+		if (m_buffer_size >= m_data_size)
 		{
 			m_buffer_size = m_data_size;
 		}
+		else if (m_buffer_size & 1)
+		{
+			m_buffer_size--;
+		}
 
 		m_cylinder_low = m_buffer_size & 0xff;
 		m_cylinder_high = m_buffer_size >> 8;
@@ -126,13 +98,21 @@ void atapi_hle_device::fill_buffer()
 
 			m_status |= IDE_STATUS_DRQ;
 			m_sector_count = ATAPI_INTERRUPT_REASON_IO;
+
+			if (m_feature & ATAPI_FEATURES_FLAG_DMA)
+			{
+				set_dmarq(ASSERT_LINE);
+			}
+			else
+			{
+				set_irq(ASSERT_LINE);
+			}
 		}
 		else
 		{
 			m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
+			set_irq(ASSERT_LINE);
 		}
-
-		set_irq(ASSERT_LINE);
 		break;
 
 	case IDE_COMMAND_IDENTIFY_PACKET_DEVICE:
@@ -145,6 +125,41 @@ void atapi_hle_device::fill_buffer()
 	}
 }
 
+void atapi_hle_device::wait_buffer()
+{
+	if (m_buffer_size >= m_data_size)
+	{
+		m_buffer_size = m_data_size;
+	}
+	else if (m_buffer_size & 1)
+	{
+		m_buffer_size--;
+	}
+
+	m_cylinder_low = m_buffer_size & 0xff;
+	m_cylinder_high = m_buffer_size >> 8;
+
+	if (m_buffer_size > 0)
+	{
+		m_status |= IDE_STATUS_DRQ;
+		m_sector_count = 0;
+
+		if (m_feature & ATAPI_FEATURES_FLAG_DMA)
+		{
+			set_dmarq(ASSERT_LINE);
+		}
+		else
+		{
+			set_irq(ASSERT_LINE);
+		}
+	}
+	else
+	{
+		m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
+		set_irq(ASSERT_LINE);
+	}
+}
+
 void atapi_hle_device::signature()
 {
 	// TODO: IDENTIFY DEVICE & READ SECTORS writes signature too.
diff --git a/src/emu/machine/atapihle.h b/src/emu/machine/atapihle.h
index b15802b1c56..f5a685edfaa 100644
--- a/src/emu/machine/atapihle.h
+++ b/src/emu/machine/atapihle.h
@@ -22,7 +22,13 @@ class atapi_hle_device : public ata_hle_device
 public:
 	atapi_hle_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock,const char *shortname, const char *source);
 
-	enum
+	enum atapi_features_flag_t
+	{
+		ATAPI_FEATURES_FLAG_DMA = 0x01,
+		ATAPI_FEATURES_FLAG_OVL = 0x02
+	};
+
+	enum atapi_interrupt_reason_t
 	{
 		ATAPI_INTERRUPT_REASON_CD = 0x01, // 1 = command, 0 = data
 		ATAPI_INTERRUPT_REASON_IO = 0x02, // 1 = to host, 0 = to device
@@ -59,6 +65,8 @@ protected:
 	packet_command_response_t packet_command_response();
 
 private:
+	void wait_buffer();
+
 	int m_packet;
 	int m_data_size;
 	required_device<scsihle_device> m_scsidev_device;
diff --git a/src/mess/machine/dccons.c b/src/mess/machine/dccons.c
index 106c8ec846e..22f25d05bde 100644
--- a/src/mess/machine/dccons.c
+++ b/src/mess/machine/dccons.c
@@ -46,7 +46,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
 
 	//mame_printf_debug("ATAPI: xfer_end.  xferlen = %d\n", atapi_xferlen);
 
-	address_space &space = m_maincpu->space(AS_PROGRAM);
+	m_ata->write_dmack(1);
 
 	while (atapi_xferlen > 0 )
 	{
@@ -55,7 +55,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
 		// get a sector from the SCSI device
 		for (int i = 0; i < 2048/2; i++)
 		{
-			int d = m_ata->read_cs0(space, 0, 0xffff);
+			int d = m_ata->read_dma();
 			sector_buffer[ i*2 ] = d & 0xff;
 			sector_buffer[ (i*2)+1 ] = d >> 8;
 		}
@@ -76,6 +76,8 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
 		atapi_xferbase += 2048;
 	}
 
+	m_ata->write_dmack(0);
+
 	g1bus_regs[SB_GDST]=0;
 	dc_sysctrl_regs[SB_ISTNRM] |= IST_DMA_GDROM;
 	dc_update_interrupt_status();