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diff --git a/src/devices/bus/mtx/cfx.h b/src/devices/bus/mtx/cfx.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Memotech Compact Flash System
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_MTX_CFX_H
+#define MAME_BUS_MTX_CFX_H
+
+#include "exp.h"
+#include "machine/i8255.h"
+#include "bus/ata/ataintf.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class mtx_cfx_device : public device_t, public device_mtx_exp_interface
+{
+public:
+ // construction/destruction
+ mtx_cfx_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ required_memory_region m_flash;
+ required_device<i8255_device> m_pia;
+ required_device<ata_interface_device> m_ide;
+
+ uint16_t m_ide_data;
+
+ void portc_w(uint8_t data);
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(MTX_CFX, mtx_cfx_device)
+
+#endif // MAME_BUS_MTX_CFX_H