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diff --git a/src/devices/bus/coleco/cartridge/exp.h b/src/devices/bus/coleco/cartridge/exp.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ ColecoVision cartridge port emulation
+
+**********************************************************************
+
+ D2 1 2 /C000
+ D1 3 4 D3
+ D0 5 6 D4
+ A0 7 8 D5
+ A1 9 10 D6
+ A2 11 12 D7
+ SHLD 13 14 A11
+ A3 15 16 A10
+ A4 17 18 /8000
+ A13 19 20 A14
+ A5 21 22 /A000
+ A6 23 24 A12
+ A7 25 26 A9
+ /E000 27 28 A8
+ GND 29 30 +5V
+
+
+**********************************************************************/
+
+#ifndef MAME_BUS_COLECO_EXP_H
+#define MAME_BUS_COLECO_EXP_H
+
+#pragma once
+
+#include "softlist_dev.h"
+
+
+//**************************************************************************
+// CONSTANTS
+//**************************************************************************
+
+#define COLECOVISION_CARTRIDGE_SLOT_TAG "cartslot"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> colecovision_cartridge_slot_device
+
+class device_colecovision_cartridge_interface;
+
+class colecovision_cartridge_slot_device : public device_t,
+ public device_slot_interface,
+ public device_image_interface
+{
+public:
+ // construction/destruction
+ template <typename T>
+ colecovision_cartridge_slot_device(machine_config const &mconfig, char const *tag, device_t *owner, T &&opts, char const *dflt)
+ : colecovision_cartridge_slot_device(mconfig, tag, owner, (uint32_t)0)
+ {
+ option_reset();
+ opts(*this);
+ set_default_option(dflt);
+ set_fixed(false);
+ }
+ colecovision_cartridge_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ // computer interface
+ uint8_t bd_r(offs_t offset, uint8_t data, int _8000, int _a000, int _c000, int _e000);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // image-level overrides
+ virtual image_init_result call_load() override;
+ virtual const software_list_loader &get_software_list_loader() const override { return rom_software_list_loader::instance(); }
+
+ virtual iodevice_t image_type() const override { return IO_CARTSLOT; }
+
+ virtual bool is_readable() const override { return 1; }
+ virtual bool is_writeable() const override { return 0; }
+ virtual bool is_creatable() const override { return 0; }
+ virtual bool must_be_loaded() const override { return 0; }
+ virtual bool is_reset_on_load() const override { return 1; }
+ virtual const char *image_interface() const override { return "coleco_cart"; }
+ virtual const char *file_extensions() const override { return "rom,col,bin"; }
+
+ // slot interface overrides
+ virtual std::string get_default_card_software(get_default_card_software_hook &hook) const override;
+
+ device_colecovision_cartridge_interface *m_card;
+};
+
+
+// ======================> device_colecovision_cartridge_interface
+
+class device_colecovision_cartridge_interface : public device_slot_card_interface
+{
+ friend class colecovision_cartridge_slot_device;
+
+public:
+ virtual uint8_t bd_r(offs_t offset, uint8_t data, int _8000, int _a000, int _c000, int _e000) { return 0xff; }
+
+ void rom_alloc(size_t size);
+
+protected:
+ // construction/destruction
+ device_colecovision_cartridge_interface(const machine_config &mconfig, device_t &device);
+
+ uint8_t *m_rom;
+ size_t m_rom_size;
+
+ colecovision_cartridge_slot_device *m_slot;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(COLECOVISION_CARTRIDGE_SLOT, colecovision_cartridge_slot_device)
+
+void colecovision_cartridges(device_slot_interface &device);
+
+#endif // MAME_BUS_COLECO_EXP_H