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diff --git a/src/mame/ussr/vm1timer.h b/src/mame/ussr/vm1timer.h
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+++ b/src/mame/ussr/vm1timer.h
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+// license:BSD-3-Clause
+// copyright-holders:Sergey Svishchev
+/**********************************************************************
+
+ K1801VM1 on-chip timer
+
+**********************************************************************/
+
+#ifndef MAME_USSR_VM1TIMER_H
+#define MAME_USSR_VM1TIMER_H
+
+#pragma once
+
+#include "machine/pdp11.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class k1801vm1_timer_device : public device_t
+{
+public:
+ // construction/destruction
+ k1801vm1_timer_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ uint16_t read(offs_t offset);
+ void write(offs_t offset, uint16_t data, uint16_t mem_mask = ~0);
+
+ void init_w();
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ static constexpr uint16_t TMRCSR_SP = 0001;
+ static constexpr uint16_t TMRCSR_CAP = 0002;
+ static constexpr uint16_t TMRCSR_MON = 0004;
+ static constexpr uint16_t TMRCSR_OS = 0010;
+ static constexpr uint16_t TMRCSR_RUN = 0020;
+ static constexpr uint16_t TMRCSR_D16 = 0040;
+ static constexpr uint16_t TMRCSR_D4 = 0100;
+ static constexpr uint16_t TMRCSR_FL = 0200;
+ static constexpr uint16_t TMRCSR_WR = 0377;
+
+ uint16_t m_csr;
+ uint16_t m_counter;
+ uint16_t m_limit;
+
+ emu_timer *m_timer;
+ emu_timer *m_reload;
+
+ TIMER_CALLBACK_MEMBER(timer_tick);
+ TIMER_CALLBACK_MEMBER(timer_reload);
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(K1801VM1_TIMER, k1801vm1_timer_device)
+
+#endif // MAME_USSR_VM1TIMER_H