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diff --git a/src/devices/bus/sbus/bwtwo.h b/src/devices/bus/sbus/bwtwo.h
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+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/***************************************************************************
+
+ Sun bwtwo monochrome video controller
+
+***************************************************************************/
+
+#ifndef MAME_BUS_SBUS_BWTWO_H
+#define MAME_BUS_SBUS_BWTWO_H
+
+#pragma once
+
+#include "sbus.h"
+
+
+class sbus_bwtwo_device : public device_t, public device_sbus_card_interface
+{
+public:
+ // construction/destruction
+ sbus_bwtwo_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device_t overrides
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+
+ // device_sbus_slot_interface overrides
+ virtual void install_device() override;
+
+ DECLARE_READ8_MEMBER(regs_r);
+ DECLARE_WRITE8_MEMBER(regs_w);
+ DECLARE_READ32_MEMBER(rom_r);
+ DECLARE_READ32_MEMBER(vram_r);
+ DECLARE_WRITE32_MEMBER(vram_w);
+
+private:
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+
+ void mem_map(address_map &map) override;
+
+ //required_shared_ptr<uint32_t> m_vram;
+ required_memory_region m_rom;
+ std::unique_ptr<uint32_t[]> m_vram;
+ required_device<screen_device> m_screen;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(SBUS_BWTWO, sbus_bwtwo_device)
+
+#endif // MAME_BUS_SBUS_BWTWO_H