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diff --git a/src/devices/bus/bbc/tube/tube_a500.h b/src/devices/bus/bbc/tube/tube_a500.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Acorn A500 2nd processor
+
+ http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Acorn_A5002ndProc.html
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_BBC_TUBE_A500_H
+#define MAME_BUS_BBC_TUBE_A500_H
+
+#include "tube.h"
+#include "cpu/arm/arm.h"
+#include "machine/tube.h"
+#include "machine/input_merger.h"
+#include "machine/acorn_ioc.h"
+#include "machine/acorn_memc.h"
+#include "machine/acorn_vidc.h"
+#include "machine/archimedes_keyb.h"
+#include "screen.h"
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> bbc_tube_a500_device
+
+class bbc_tube_a500_device :
+ public device_t,
+ public device_bbc_tube_interface
+{
+public:
+ // construction/destruction
+ bbc_tube_a500_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+ virtual uint8_t host_r(offs_t offset) override;
+ virtual void host_w(offs_t offset, uint8_t data) override;
+
+private:
+ required_device<arm_cpu_device> m_maincpu;
+ required_device<acorn_ioc_device> m_ioc;
+ required_device<acorn_memc_device> m_memc;
+ required_device<acorn_vidc10_device> m_vidc;
+ required_device<tube_device> m_ula;
+ required_device<input_merger_device> m_irqs;
+ required_device<input_merger_device> m_fiqs;
+
+ void arm_mem(address_map &map);
+ void a500_map(address_map &map);
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(BBC_TUBE_A500, bbc_tube_a500_device)
+
+
+#endif /* MAME_BUS_BBC_TUBE_A500_H */