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diff --git a/src/devices/machine/tc9223.h b/src/devices/machine/tc9223.h
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+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// TC9223P/TC9223F PLL-based frequency synthesizer
+#ifndef MAME_MACHINE_TC9223_H
+#define MAME_MACHINE_TC9223_H
+
+#pragma once
+
+class tc9223_device : public device_t
+{
+public:
+ tc9223_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+
+ void stb_w(int state);
+ void dat_w(int state);
+ void clk_w(int state);
+
+protected:
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+private:
+ u16 m_shift;
+ u8 m_stb, m_clk, m_dat;
+};
+
+DECLARE_DEVICE_TYPE(TC9223, tc9223_device)
+
+#endif // MAME_MACHINE_TC9223_H