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diff --git a/src/mame/machine/elan_eu3a05commonsys.h b/src/mame/machine/elan_eu3a05commonsys.h
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+// license:BSD-3-Clause
+// copyright-holders:David Haywood
+
+#ifndef MAME_MACHINE_ELAN_EU3A05COMMONSYS_H
+#define MAME_MACHINE_ELAN_EU3A05COMMONSYS_H
+
+#include "cpu/m6502/m6502.h"
+#include "machine/bankdev.h"
+
+class elan_eu3a05commonsys_device : public device_t
+{
+public:
+ elan_eu3a05commonsys_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ elan_eu3a05commonsys_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ template <typename T> void set_cpu(T &&tag) { m_cpu.set_tag(std::forward<T>(tag)); }
+ template <typename T> void set_addrbank(T &&tag) { m_bank.set_tag(std::forward<T>(tag)); }
+
+ void generate_custom_interrupt(int level);
+
+ DECLARE_READ8_MEMBER(intmask_r);
+ DECLARE_WRITE8_MEMBER(intmask_w);
+
+ DECLARE_READ8_MEMBER(nmi_vector_r);
+ DECLARE_READ8_MEMBER(irq_vector_r);
+
+ DECLARE_WRITE8_MEMBER(elan_eu3a05_rombank_w);
+ DECLARE_READ8_MEMBER(elan_eu3a05_rombank_r);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ required_device<m6502_device> m_cpu;
+ required_device<address_map_bank_device> m_bank;
+ uint8_t m_intmask[2];
+
+ int m_custom_irq;
+ int m_custom_nmi;
+ uint16_t m_custom_irq_vector;
+ uint16_t m_custom_nmi_vector;
+
+ uint8_t m_rombank_hi;
+ uint8_t m_rombank_lo;
+};
+
+DECLARE_DEVICE_TYPE(ELAN_EU3A05_COMMONSYS, elan_eu3a05commonsys_device)
+
+#endif // MAME_MACHINE_ELAN_EU3A05COMMONSYS_H