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diff --git a/src/devices/bus/mm2/mm2kb.h b/src/devices/bus/mm2/mm2kb.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Nokia MikroMikko 2 keyboard emulation
+
+*********************************************************************/
+
+#ifndef MAME_NOKIA_MM2KB_H
+#define MAME_NOKIA_MM2KB_H
+
+#pragma once
+
+DECLARE_DEVICE_TYPE(NOKIA_MM2_KBD, mm2_keyboard_device)
+
+class mm2_keyboard_device : public device_t
+{
+public:
+ // construction/destruction
+ mm2_keyboard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+
+ auto txd_handler() { return m_write_txd.bind(); }
+
+ void rxd_w(int state) { }
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+ virtual ioport_constructor device_input_ports() const override ATTR_COLD;
+
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+private:
+ devcb_write_line m_write_txd;
+};
+
+#endif // MAME_NOKIA_MM2KB_H