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diff --git a/src/devices/bus/tanbus/tanhrg.h b/src/devices/bus/tanbus/tanhrg.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Tangerine High Resolution Graphics Card (MT0055 Iss2)
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_TANBUS_TANHRG_H
+#define MAME_BUS_TANBUS_TANHRG_H
+
+#pragma once
+
+#include "bus/tanbus/tanbus.h"
+#include "emupal.h"
+#include "screen.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class tanbus_tanhrg_device :
+ public device_t,
+ public device_tanbus_interface
+{
+public:
+ // construction/destruction
+ tanbus_tanhrg_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+
+ virtual uint8_t read(offs_t offset, int inhrom, int inhram, int be) override;
+ virtual void write(offs_t offset, uint8_t data, int inhrom, int inhram, int be) override;
+ virtual void set_inhibit_lines(offs_t offset, int &inhram, int &inhrom) override;
+
+private:
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+ required_ioport m_dsw;
+ required_device<screen_device> m_screen;
+ required_device<palette_device> m_palette;
+
+ std::unique_ptr<uint8_t[]> m_videoram;
+};
+
+
+class tanbus_tanhrgc_device :
+ public device_t,
+ public device_tanbus_interface
+{
+public:
+ // construction/destruction
+ tanbus_tanhrgc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+
+ virtual uint8_t read(offs_t offset, int inhrom, int inhram, int be) override;
+ virtual void write(offs_t offset, uint8_t data, int inhrom, int inhram, int be) override;
+ virtual void set_inhibit_lines(offs_t offset, int &inhram, int &inhrom) override;
+
+private:
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+ required_ioport_array<3> m_dsw;
+ required_device<screen_device> m_screen;
+ required_device<palette_device> m_palette;
+
+ std::unique_ptr<uint8_t[]> m_videoram;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(TANBUS_TANHRG, tanbus_tanhrg_device)
+DECLARE_DEVICE_TYPE(TANBUS_TANHRGC, tanbus_tanhrgc_device)
+
+
+#endif // MAME_BUS_TANBUS_TANHRG_H