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// license: GPL-2.0+
// copyright-holders: Dirk Best
/***************************************************************************

    VTech Laser/VZ Memory Expansion Slot

    44-pin slot

    22  GND             23  NC
    21  +5VDC           24  A11
    20  /IORQ           25  A12
    19  /RD             26  A13
    18  /NMI            27  A14
    17  /WAIT           28  A15
    16  /MI             29  CLK
    15  /RFSH           30  D4
    14  D7              31  D3
    13  D2              32  D5
    12  A1              33  D6
    11  A2              34  NC
    10  A3              35  A0
     9  A4              36  D0
     8  A5              37  D1
     7  A6              38  /INT
     6  A7              39  /HALT
     5  A8              40  /MERQ
     4  A9              41  /WR
     3  A10             42  /NC
     2  /RESET          43  +9VDC
     1  GND             44  NC

***************************************************************************/

#ifndef MAME_BUS_VTECH_MEMEXP_MEMEXP_H
#define MAME_BUS_VTECH_MEMEXP_MEMEXP_H

#pragma once

#include "machine/bankdev.h"

// include here so drivers don't need to
#include "carts.h"


//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

class device_vtech_memexp_interface;

class vtech_memexp_slot_device : public device_t, public device_single_card_slot_interface<device_vtech_memexp_interface>
{
	friend class device_vtech_memexp_interface;
public:
	// construction/destruction
	vtech_memexp_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL());
	virtual ~vtech_memexp_slot_device();

	template <typename T> void set_memspace(T &&tag, int spacenum) { m_memspace.set_tag(std::forward<T>(tag), spacenum); }
	template <typename T> void set_iospace(T &&tag, int spacenum) { m_iospace.set_tag(std::forward<T>(tag), spacenum); }

	// callbacks
	auto int_handler() { return m_int_handler.bind(); }
	auto nmi_handler() { return m_nmi_handler.bind(); }
	auto reset_handler() { return m_reset_handler.bind(); }

	// called from cart device
	DECLARE_WRITE_LINE_MEMBER( int_w ) { m_int_handler(state); }
	DECLARE_WRITE_LINE_MEMBER( nmi_w ) { m_nmi_handler(state); }
	DECLARE_WRITE_LINE_MEMBER( reset_w ) { m_reset_handler(state); }

protected:
	// device-level overrides
	virtual void device_start() override;

private:
	required_address_space m_memspace;
	required_address_space m_iospace;

	devcb_write_line m_int_handler;
	devcb_write_line m_nmi_handler;
	devcb_write_line m_reset_handler;

	device_vtech_memexp_interface *m_module;
};

// class representing interface-specific live memexp device
class device_vtech_memexp_interface : public device_interface
{
public:
	// construction/destruction
	device_vtech_memexp_interface(const machine_config &mconfig, device_t &device);
	virtual ~device_vtech_memexp_interface();

	virtual uint8_t mreq_r(offs_t offset) { return 0xff; }
	virtual void mreq_w(offs_t offset, uint8_t data) { }
	virtual uint8_t iorq_r(offs_t offset) { return 0xff; }
	virtual void iorq_w(offs_t offset, uint8_t data) { }

protected:
	vtech_memexp_slot_device *m_slot;
};

// base memory expansion device
class vtech_memexp_device : public device_t, public device_vtech_memexp_interface
{
public:
	// construction/destruction
	vtech_memexp_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock);

	// from host
	virtual uint8_t mreq_r(offs_t offset) override;
	virtual void mreq_w(offs_t offset, uint8_t data) override;
	virtual uint8_t iorq_r(offs_t offset) override;
	virtual void iorq_w(offs_t offset, uint8_t data) override;

protected:
	virtual void device_add_mconfig(machine_config &config) override;
	virtual void device_start() override;

	virtual void mem_map(address_map &map) { }
	virtual void io_map(address_map &map) { }

	required_device<address_map_bank_device> m_mem;
	required_device<address_map_bank_device> m_io;
};

// device type definition
DECLARE_DEVICE_TYPE(VTECH_MEMEXP_SLOT, vtech_memexp_slot_device)

#endif // MAME_BUS_VTECH_MEMEXP_MEMEXP_H