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diff --git a/src/devices/bus/cbm2/exp.h b/src/devices/bus/cbm2/exp.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Commodore CBM-II Expansion Port emulation
+
+**********************************************************************
+
+ A0 1 A BD0
+ A1 2 B BD1
+ A2 3 C BD2
+ A3 4 D BD3
+ A4 5 E BD4
+ A5 6 F BD5
+ A6 7 H BD6
+ A7 8 J BD7
+ A8 9 K GND
+ A9 10 L GND
+ A10 11 M SR/_W
+ A11 12 N Sphi2
+ A12 13 P _CSBANK1
+ +5V 14 R _CSBANK2
+ +5V 15 S _CSBANK2
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __CBM2_EXPANSION_SLOT__
+#define __CBM2_EXPANSION_SLOT__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// CONSTANTS
+//**************************************************************************
+
+#define CBM2_EXPANSION_SLOT_TAG "exp"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_CBM2_EXPANSION_SLOT_ADD(_tag, _clock, _slot_intf, _def_slot) \
+ MCFG_DEVICE_ADD(_tag, CBM2_EXPANSION_SLOT, _clock) \
+ MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> cbm2_expansion_slot_device
+
+class device_cbm2_expansion_card_interface;
+
+class cbm2_expansion_slot_device : public device_t,
+ public device_slot_interface,
+ public device_image_interface
+{
+public:
+ // construction/destruction
+ cbm2_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // computer interface
+ UINT8 read(address_space &space, offs_t offset, UINT8 data, int csbank1, int csbank2, int csbank3);
+ void write(address_space &space, offs_t offset, UINT8 data, int csbank1, int csbank2, int csbank3);
+
+ // cartridge interface
+ int phi2() { return clock(); }
+
+protected:
+ // device-level overrides
+ virtual void device_config_complete() { update_names(); }
+ virtual void device_start();
+ virtual void device_reset();
+
+ // image-level overrides
+ virtual bool call_load();
+ virtual bool call_softlist_load(software_list_device &swlist, const char *swname, const rom_entry *start_entry);
+
+ virtual iodevice_t image_type() const { return IO_CARTSLOT; }
+
+ virtual bool is_readable() const { return 1; }
+ virtual bool is_writeable() const { return 0; }
+ virtual bool is_creatable() const { return 0; }
+ virtual bool must_be_loaded() const { return 0; }
+ virtual bool is_reset_on_load() const { return 1; }
+ virtual const char *image_interface() const { return "cbm2_cart"; }
+ virtual const char *file_extensions() const { return "20,40,60"; }
+ virtual const option_guide *create_option_guide() const { return NULL; }
+
+ // slot interface overrides
+ virtual void get_default_card_software(std::string &result);
+
+ device_cbm2_expansion_card_interface *m_card;
+};
+
+
+// ======================> device_cbm2_expansion_card_interface
+
+class device_cbm2_expansion_card_interface : public device_slot_card_interface
+{
+ friend class cbm2_expansion_slot_device;
+
+public:
+ // construction/destruction
+ device_cbm2_expansion_card_interface(const machine_config &mconfig, device_t &device);
+ virtual ~device_cbm2_expansion_card_interface();
+
+ virtual UINT8 cbm2_bd_r(address_space &space, offs_t offset, UINT8 data, int csbank1, int csbank2, int csbank3) { return data; };
+ virtual void cbm2_bd_w(address_space &space, offs_t offset, UINT8 data, int csbank1, int csbank2, int csbank3) { };
+
+protected:
+ optional_shared_ptr<UINT8> m_bank1;
+ optional_shared_ptr<UINT8> m_bank2;
+ optional_shared_ptr<UINT8> m_bank3;
+
+ cbm2_expansion_slot_device *m_slot;
+};
+
+
+// device type definition
+extern const device_type CBM2_EXPANSION_SLOT;
+
+
+SLOT_INTERFACE_EXTERN( cbm2_expansion_cards );
+
+
+
+#endif