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diff --git a/src/mame/namco/namco51.h b/src/mame/namco/namco51.h
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+// license:BSD-3-Clause
+// copyright-holders:Mike Harris, Aaron Giles
+#ifndef MAME_NAMCO_NAMCO51_H
+#define MAME_NAMCO_NAMCO51_H
+
+#pragma once
+
+#include "cpu/mb88xx/mb88xx.h"
+
+
+class namco_51xx_device : public device_t
+{
+public:
+ namco_51xx_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ template <unsigned N> auto input_callback() { return m_in[N].bind(); }
+ auto output_callback() { return m_out.bind(); }
+ auto lockout_callback() { return m_lockout.bind(); }
+
+ void reset(int state);
+ void vblank(int state);
+ void rw(int state);
+ void chip_select(int state);
+ void write(uint8_t data);
+ uint8_t read();
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+ // internal state
+ required_device<mb88_cpu_device> m_cpu;
+ uint8_t m_portO;
+ uint8_t m_rw;
+ devcb_read8::array<4> m_in;
+ devcb_write8 m_out;
+ devcb_write_line m_lockout;
+
+ uint8_t K_r();
+ template<int N> uint8_t R_r();
+ void O_w(uint8_t data);
+ void P_w(uint8_t data);
+
+ TIMER_CALLBACK_MEMBER(rw_sync);
+ TIMER_CALLBACK_MEMBER(write_sync);
+ TIMER_CALLBACK_MEMBER(O_w_sync);
+};
+
+DECLARE_DEVICE_TYPE(NAMCO_51XX, namco_51xx_device)
+
+#endif // MAME_NAMCO_51XX