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diff --git a/src/devices/cpu/mk1/mk1.h b/src/devices/cpu/mk1/mk1.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_CPU_MK1_MK1_H
+#define MAME_CPU_MK1_MK1_H
+
+#pragma once
+
+class mk1_cpu_device : public cpu_device
+{
+public:
+ enum {
+ MK1_PC, MK1_OP,
+ MK1_W, MK1_IP,
+ MK1_TOS, MK1_RS,
+ MK1_PSP, MK1_RSP,
+ MK1_A, MK1_B, MK1_ALU, MK1_F,
+ MK1_IE
+ };
+
+ static constexpr int AS_STACK = AS_DATA + 1;
+ static constexpr int IRQ_LINE = 0;
+
+ // device type constructor
+ mk1_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+ // device_execute_interface overrides
+ virtual void execute_run() override;
+ virtual void execute_set_input(int linenum, int state) override;
+
+ // device_memory_interface overrides
+ virtual space_config_vector memory_space_config() const override;
+
+ // device_state_interface overrides
+ virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
+
+ // device_disasm_interface overrides
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+private:
+ // internal helpers
+ void alu_update();
+ void set_alu_function(u8 data);
+ void set_irq_enable(bool state);
+ void execute_one();
+
+ static const u8 s_alu_decode[16];
+
+ // address spaces
+ const address_space_config m_program_config;
+ const address_space_config m_data_config;
+ const address_space_config m_stack_config;
+ memory_access<12, 0, 0, ENDIANNESS_LITTLE>::cache m_cache;
+ memory_access<16, 0, 0, ENDIANNESS_LITTLE>::specific m_data;
+ memory_access<10, 0, 0, ENDIANNESS_LITTLE>::specific m_stack;
+
+ // internal state
+ u16 m_pc;
+ u8 m_inst;
+ u8 m_op_latch;
+ u16 m_index_reg[2];
+ u8 m_sp[2];
+ u8 m_alu_a;
+ u8 m_alu_b;
+ u8 m_alu_function;
+ u8 m_alu_result;
+ u8 m_cond_flags;
+ bool m_irq_asserted;
+ bool m_irq_enabled;
+ s32 m_icount;
+};
+
+// device type declaration
+DECLARE_DEVICE_TYPE(MK1_CPU, mk1_cpu_device)
+
+#endif // MAME_CPU_MK1_MK1_H