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diff --git a/src/devices/bus/hp80_io/82939.h b/src/devices/bus/hp80_io/82939.h
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+// license:BSD-3-Clause
+// copyright-holders: F. Ulivi
+/*********************************************************************
+
+ 82939.h
+
+ 82939 module (RS232 interface)
+
+*********************************************************************/
+
+#ifndef MAME_BUS_HP80_IO_82939_H
+#define MAME_BUS_HP80_IO_82939_H
+
+#pragma once
+
+#include "hp80_io.h"
+#include "cpu/mcs48/mcs48.h"
+#include "machine/1mb5.h"
+#include "machine/ins8250.h"
+#include "bus/rs232/rs232.h"
+
+class hp82939_io_card_device : public device_t, public device_hp80_io_interface
+{
+public:
+ // construction/destruction
+ hp82939_io_card_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ virtual ~hp82939_io_card_device();
+
+protected:
+ virtual void device_start() override;
+
+ // device-level overrides
+ virtual ioport_constructor device_input_ports() const override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+
+ virtual void install_read_write_handlers(address_space& space , uint16_t base_addr) override;
+
+ virtual void inten() override;
+ virtual void clear_service() override;
+
+private:
+ required_device<i8049_device> m_cpu;
+ required_device<hp_1mb5_device> m_translator;
+ required_device<rs232_port_device> m_rs232;
+ required_device<ins8250_device> m_uart;
+ required_ioport m_sw12;
+
+ DECLARE_READ8_MEMBER(p1_r);
+ DECLARE_WRITE8_MEMBER(p1_w);
+ DECLARE_READ8_MEMBER(p2_r);
+ DECLARE_READ8_MEMBER(cpu_r);
+ DECLARE_WRITE8_MEMBER(cpu_w);
+ void cpu_io_map(address_map &map);
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(HP82939_IO_CARD, hp82939_io_card_device)
+
+#endif // MAME_BUS_HP80_IO_82939_H