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diff --git a/src/devices/bus/ata/px320a.h b/src/devices/bus/ata/px320a.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_BUS_ATA_PX320A_H
+#define MAME_BUS_ATA_PX320A_H
+
+#pragma once
+
+#include "atadev.h"
+
+class px320a_device : public device_t, public device_ata_interface
+{
+public:
+ px320a_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+protected:
+ virtual void device_start() override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+ virtual u16 read_dma() override;
+ virtual u16 read_cs0(offs_t offset, u16 mem_mask = 0xffff) override;
+ virtual u16 read_cs1(offs_t offset, u16 mem_mask = 0xffff) override;
+ virtual void write_dma(u16 data) override;
+ virtual void write_cs0(offs_t offset, u16 data, u16 mem_mask = 0xffff) override;
+ virtual void write_cs1(offs_t offset, u16 data, u16 mem_mask = 0xffff) override;
+ virtual DECLARE_WRITE_LINE_MEMBER(write_dmack) override;
+ virtual DECLARE_WRITE_LINE_MEMBER(write_csel) override;
+ virtual DECLARE_WRITE_LINE_MEMBER(write_dasp) override;
+ virtual DECLARE_WRITE_LINE_MEMBER(write_pdiag) override;
+
+private:
+ void frcpu_map(address_map &map);
+
+ required_device<cpu_device> m_frcpu;
+};
+
+DECLARE_DEVICE_TYPE(PX320A, px320a_device)
+
+#endif // MAME_BUS_ATA_PX320A_H