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diff --git a/src/devices/bus/coco/coco_wpk.h b/src/devices/bus/coco/coco_wpk.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+#ifndef MAME_BUS_COCO_COCO_WPK_H
+#define MAME_BUS_COCO_COCO_WPK_H
+
+#pragma once
+
+#include "cococart.h"
+#include "video/mc6845.h"
+#include "emupal.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> coco_wpk_device
+
+class coco_wpk_device :
+ public device_t,
+ public device_cococart_interface
+{
+public:
+ static constexpr feature_type imperfect_features() { return feature::GRAPHICS; }
+
+ // construction/destruction
+ coco_wpk_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // construction/destruction
+ coco_wpk_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+ virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
+
+ required_device<r6545_1_device> m_crtc;
+ required_device<palette_device> m_palette;
+ required_memory_region m_chargen;
+
+ u16 m_video_addr;
+
+ std::unique_ptr<u8[]> m_video_ram;
+
+ void crtc_display_w(u8 data);
+ MC6845_ON_UPDATE_ADDR_CHANGED(crtc_addr);
+ MC6845_UPDATE_ROW(crtc_update_row);
+};
+
+
+// ======================> coco_wpk2_device
+
+class coco_wpk2_device : public coco_wpk_device
+{
+public:
+ // construction/destruction
+ coco_wpk2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+private:
+ void video_select_w(u8 data);
+};
+
+
+// ======================> coco_wpkrs_device
+
+class coco_wpkrs_device : public coco_wpk_device
+{
+public:
+ // construction/destruction
+ coco_wpkrs_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(COCO_WPK, coco_wpk_device)
+DECLARE_DEVICE_TYPE(COCO_WPK2, coco_wpk2_device)
+DECLARE_DEVICE_TYPE(COCO_WPKRS, coco_wpkrs_device)
+
+#endif // MAME_BUS_COCO_COCO_WPK_H