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diff --git a/src/devices/cpu/alpha/alpha.h b/src/devices/cpu/alpha/alpha.h
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+// license:BSD-3-Clause
+// copyright-holders:Patrick Mackinlay
+
+#ifndef MAME_CPU_ALPHA_ALPHA_H
+#define MAME_CPU_ALPHA_ALPHA_H
+
+#pragma once
+
+#include <limits.h>
+#include "softfloat/milieu.h"
+#include "softfloat/softfloat.h"
+
+class alpha_device : public cpu_device
+{
+public:
+
+protected:
+ alpha_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // device_execute_interface overrides
+ virtual u32 execute_min_cycles() const override { return 1; }
+ virtual u32 execute_max_cycles() const override { return 1; }
+ virtual u32 execute_input_lines() const override { return 6; }
+ virtual void execute_run() override;
+ virtual void execute_set_input(int inputnum, int state) override;
+
+ // device_memory_interface overrides
+ virtual space_config_vector memory_space_config() const override;
+ virtual bool memory_translate(int spacenum, int intention, offs_t &address) override;
+
+ // device_disasm_interface overrides
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+private:
+ // emulation state
+ address_space_config m_main_config;
+ int m_icount;
+
+ u64 m_pc;
+ u64 m_r[32]; // R31 is zero
+ u64 m_f[32]; // F31 is zero
+};
+
+class dec_21064_device : public alpha_device
+{
+public:
+ dec_21064_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+};
+
+DECLARE_DEVICE_TYPE(DEC_21064, dec_21064_device)
+
+#endif // MAME_CPU_ALPHA_ALPHA_H