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diff --git a/src/devices/bus/a2bus/ccs7710.h b/src/devices/bus/a2bus/ccs7710.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/*********************************************************************
+
+ CCS Model 7710 Asynchronous Serial Interface
+
+*********************************************************************/
+
+#ifndef MAME_BUS_A2BUS_CCS7710_H
+#define MAME_BUS_A2BUS_CCS7710_H
+
+#pragma once
+
+#include "a2bus.h"
+#include "machine/6850acia.h"
+#include "machine/f4702.h"
+
+class ccs7710_device : public device_t, public device_a2bus_card_interface
+{
+public:
+ // device type constructor
+ ccs7710_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+ virtual ioport_constructor device_input_ports() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual const tiny_rom_entry *device_rom_region() const override;
+
+ // device_a2bus_card_interface overrides
+ virtual u8 read_c0nx(u8 offset) override;
+ virtual void write_c0nx(u8 offset, u8 data) override;
+ virtual u8 read_cnxx(u8 offset) override;
+
+private:
+ // miscellaneous handlers
+ DECLARE_WRITE_LINE_MEMBER(acia_irq_w);
+ DECLARE_WRITE_LINE_MEMBER(external_clock_w);
+ u8 baud_select_r(offs_t offset);
+
+ // object finders
+ required_device<acia6850_device> m_acia;
+ required_device<f4702_device> m_brg;
+ required_region_ptr<u8> m_firmware;
+ required_ioport m_baud_select;
+
+ // internal state
+ bool m_external_clock;
+};
+
+// device type declaration
+DECLARE_DEVICE_TYPE(A2BUS_CCS7710, ccs7710_device)
+
+#endif // MAME_BUS_A2BUS_CCS7710_H