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diff --git a/src/devices/bus/electron/cart/ap5.h b/src/devices/bus/electron/cart/ap5.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ ACP Advanced Plus 5
+
+**********************************************************************/
+
+#ifndef MAME_BUS_ELECTRON_CART_AP5_H
+#define MAME_BUS_ELECTRON_CART_AP5_H
+
+#include "slot.h"
+#include "machine/6522via.h"
+#include "bus/bbc/1mhzbus/1mhzbus.h"
+#include "bus/bbc/tube/tube.h"
+#include "bus/bbc/userport/userport.h"
+#include "bus/generic/slot.h"
+#include "bus/generic/carts.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class electron_ap5_device :
+ public device_t,
+ public device_electron_cart_interface
+{
+public:
+ // construction/destruction
+ electron_ap5_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;
+
+ // electron_cart_interface overrides
+ virtual uint8_t read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2) override;
+ virtual void write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2) override;
+
+private:
+ image_init_result load_rom(device_image_interface &image, generic_slot_device *slot);
+ DECLARE_DEVICE_IMAGE_LOAD_MEMBER(rom1_load) { return load_rom(image, m_romslot[0]); }
+ DECLARE_DEVICE_IMAGE_LOAD_MEMBER(rom2_load) { return load_rom(image, m_romslot[1]); }
+
+ required_device<via6522_device> m_via;
+ required_device<bbc_tube_slot_device> m_tube;
+ required_device<bbc_1mhzbus_slot_device> m_1mhzbus;
+ required_device<bbc_userport_slot_device> m_userport;
+ required_device_array<generic_slot_device, 2> m_romslot;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(ELECTRON_AP5, electron_ap5_device)
+
+
+#endif // MAME_BUS_ELECTRON_CART_AP5_H