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diff --git a/src/mame/machine/mm1kb.h b/src/mame/machine/mm1kb.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Nokia MikroMikko 1 keyboard emulation
+
+*********************************************************************/
+
+#pragma once
+
+#ifndef __MM1_KEYBOARD__
+#define __MM1_KEYBOARD__
+
+#include "emu.h"
+#include "sound/speaker.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_MM1_KEYBOARD_KBST_CALLBACK(_write) \
+ devcb = &mm1_keyboard_t::set_kbst_wr_callback(*device, DEVCB_##_write);
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> mm1_keyboard_t
+
+class mm1_keyboard_t : public device_t
+{
+public:
+ // construction/destruction
+ mm1_keyboard_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ template<class _Object> static devcb_base &set_kbst_wr_callback(device_t &device, _Object object) { return downcast<mm1_keyboard_t &>(device).m_write_kbst.set_callback(object); }
+
+ // optional information overrides
+ virtual const rom_entry *device_rom_region() const;
+ virtual machine_config_constructor device_mconfig_additions() const;
+ virtual ioport_constructor device_input_ports() const;
+
+ DECLARE_READ8_MEMBER( read ) { return m_data; }
+
+ DECLARE_WRITE_LINE_MEMBER( bell_w ) { m_speaker->level_w(state); }
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+ devcb_write_line m_write_kbst;
+
+ required_device<speaker_sound_device> m_speaker;
+ required_memory_region m_rom;
+ required_ioport m_y0;
+ required_ioport m_y1;
+ required_ioport m_y2;
+ required_ioport m_y3;
+ required_ioport m_y4;
+ required_ioport m_y5;
+ required_ioport m_y6;
+ required_ioport m_y7;
+ required_ioport m_y8;
+ required_ioport m_y9;
+ required_ioport m_special;
+
+ int m_sense;
+ int m_drive;
+ UINT8 m_data;
+
+ emu_timer *m_scan_timer;
+};
+
+
+// device type definition
+extern const device_type MM1_KEYBOARD;
+
+
+
+#endif