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diff --git a/src/devices/cpu/z80/r800.h b/src/devices/cpu/z80/r800.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR,Wilbert Pol
+/***************************************************************************
+
+ ASCII R800 CPU
+
+***************************************************************************/
+
+#ifndef MAME_CPU_Z80_R800_H
+#define MAME_CPU_Z80_R800_H
+
+#pragma once
+
+#include "z80.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class r800_device : public z80_device
+{
+public:
+ // device type constructor
+ r800_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ static constexpr feature_type imperfect_features() { return feature::TIMING; }
+
+protected:
+ // device_t implementation
+ virtual void device_validity_check(validity_checker &valid) const override;
+
+ // device_execute_interface overrides
+ virtual u64 execute_clocks_to_cycles(u64 clocks) const noexcept override { return (clocks + 4 - 1) / 4; }
+ virtual u64 execute_cycles_to_clocks(u64 cycles) const noexcept override { return (cycles * 4); }
+ virtual void execute_run() override;
+
+ // device_disasm_interface implementation
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+ u8 r800_sll(u8 value);
+ void mulub(u8 value);
+ void muluw(u16 value);
+};
+
+// device type declaration
+DECLARE_DEVICE_TYPE(R800, r800_device)
+
+#endif // MAME_CPU_Z80_R800_H