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diff --git a/src/devices/bus/einstein/tk02.h b/src/devices/bus/einstein/tk02.h
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+// license: GPL-2.0+
+// copyright-holders: Dirk Best, Phill Harvey-Smith
+/***************************************************************************
+
+ TK02 80 Column Monochrome Unit
+
+***************************************************************************/
+
+#ifndef MAME_BUS_EINSTEIN_TK02_H
+#define MAME_BUS_EINSTEIN_TK02_H
+
+#pragma once
+
+#include "pipe.h"
+#include "video/mc6845.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> tk02_device
+
+class tk02_device : public device_t, public device_tatung_pipe_interface
+{
+public:
+ // construction/destruction
+ tk02_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ DECLARE_ADDRESS_MAP(map, 8);
+
+ DECLARE_WRITE_LINE_MEMBER(de_w);
+
+ DECLARE_READ8_MEMBER(ram_r);
+ DECLARE_WRITE8_MEMBER(ram_w);
+ DECLARE_READ8_MEMBER(status_r);
+
+ MC6845_UPDATE_ROW(crtc_update_row);
+
+ required_device<tatung_pipe_device> m_pipe;
+ required_device<mc6845_device> m_crtc;
+ required_device<palette_device> m_palette;
+ required_memory_region m_gfx;
+ required_ioport_array<4> m_links;
+
+ std::unique_ptr<uint8_t[]> m_ram;
+ int m_de;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(TK02_80COL, tk02_device)
+
+#endif // MAME_BUS_EINSTEIN_TK02_H