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diff --git a/src/devices/bus/thomson/cq90_028.h b/src/devices/bus/thomson/cq90_028.h
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+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// CQ 90-028 - QDD drive controller built from a motorola 6852 (serial chip)
+//
+// Handles n? QDD drives (QD 90-128)
+
+#ifndef MAME_BUS_THOMSON_CQ90_028_H
+#define MAME_BUS_THOMSON_CQ90_028_H
+
+#include "extension.h"
+#include "machine/mc6852.h"
+
+class cq90_028_device : public device_t, public thomson_extension_interface
+{
+public:
+ cq90_028_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ virtual ~cq90_028_device() = default;
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+ virtual void rom_map(address_map &map) override;
+ virtual void io_map(address_map &map) override;
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ required_device<mc6852_device> m_serial;
+ required_memory_region m_rom;
+
+ void drive_w(u8 data);
+ void motor_w(u8 data);
+ u8 status_r();
+};
+
+DECLARE_DEVICE_TYPE(CQ90_028, cq90_028_device)
+
+#endif