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// license:BSD-3-Clause
// copyright-holders:Nathan Woods
/*********************************************************************
cococart.h
CoCo/Dragon cartridge management
*********************************************************************/
#ifndef __COCOCART_H__
#define __COCOCART_H__
#include "softlist_dev.h"
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> cococart_base_update_delegate
// direct region update handler
typedef delegate<void (uint8_t *)> cococart_base_update_delegate;
#define MCFG_COCO_CARTRIDGE_CART_CB(_devcb) \
devcb = &cococart_slot_device::static_set_cart_callback(*device, DEVCB_##_devcb);
#define MCFG_COCO_CARTRIDGE_NMI_CB(_devcb) \
devcb = &cococart_slot_device::static_set_nmi_callback(*device, DEVCB_##_devcb);
#define MCFG_COCO_CARTRIDGE_HALT_CB(_devcb) \
devcb = &cococart_slot_device::static_set_halt_callback(*device, DEVCB_##_devcb);
// ======================> cococart_slot_device
class device_cococart_interface;
class cococart_slot_device : public device_t,
public device_slot_interface,
public device_image_interface
{
public:
// output lines on the CoCo cartridge slot
enum class line
{
CART, // connects to PIA1 CB1
NMI, // connects to NMI line on CPU
HALT, // connects to HALT line on CPU
SOUND_ENABLE // sound enable
};
// since we have a special value "Q" - we have to use a special enum here
enum class line_value
{
CLEAR,
ASSERT,
Q
};
// construction/destruction
cococart_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template<class _Object> static devcb_base &static_set_cart_callback(device_t &device, _Object object) { return downcast<cococart_slot_device &>(device).m_cart_callback.set_callback(object); }
template<class _Object> static devcb_base &static_set_nmi_callback(device_t &device, _Object object) { return downcast<cococart_slot_device &>(device).m_nmi_callback.set_callback(object); }
template<class _Object> static devcb_base &static_set_halt_callback(device_t &device, _Object object) { return downcast<cococart_slot_device &>(device).m_halt_callback.set_callback(object); }
// device-level overrides
virtual void device_start() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) 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 "coco_cart"; }
virtual const char *file_extensions() const override { return "ccc,rom"; }
// slot interface overrides
virtual std::string get_default_card_software() override;
// reading and writing to $FF40-$FF7F
DECLARE_READ8_MEMBER(read);
DECLARE_WRITE8_MEMBER(write);
// manipulation of cartridge lines
void set_line_value(line line, line_value value);
line_value get_line_value(line line) const;
// hack to support twiddling the Q line
void twiddle_q_lines();
// cart base
uint8_t* get_cart_base();
void set_cart_base_update(cococart_base_update_delegate update);
private:
// TIMER_POOL: Must be power of two
static constexpr int TIMER_POOL = 2;
enum
{
TIMER_CART,
TIMER_NMI,
TIMER_HALT
};
struct coco_cartridge_line
{
emu_timer *timer[TIMER_POOL];
int timer_index;
int delay;
line_value value;
int line;
int q_count;
devcb_write_line * callback;
};
// configuration
coco_cartridge_line m_cart_line;
coco_cartridge_line m_nmi_line;
coco_cartridge_line m_halt_line;
public:
devcb_write_line m_cart_callback;
devcb_write_line m_nmi_callback;
devcb_write_line m_halt_callback;
private:
// cartridge
device_cococart_interface *m_cart;
// methods
void set_line(const char *line_name, coco_cartridge_line &line, line_value value);
void set_line_timer(coco_cartridge_line &line, line_value value);
void twiddle_line_if_q(coco_cartridge_line &line);
static const char *line_value_string(line_value value);
};
// device type definition
extern const device_type COCOCART_SLOT;
// ======================> device_cococart_interface
class device_cococart_interface : public device_slot_card_interface
{
public:
// construction/destruction
device_cococart_interface(const machine_config &mconfig, device_t &device);
virtual ~device_cococart_interface();
virtual DECLARE_READ8_MEMBER(read);
virtual DECLARE_WRITE8_MEMBER(write);
virtual void set_sound_enable(bool sound_enable);
virtual uint8_t* get_cart_base();
void set_cart_base_update(cococart_base_update_delegate update);
protected:
void cart_base_changed(void);
private:
cococart_base_update_delegate m_update;
};
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_COCO_CARTRIDGE_ADD(_tag,_slot_intf,_def_slot) \
MCFG_DEVICE_ADD(_tag, COCOCART_SLOT, 0) \
MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
#define MCFG_COCO_CARTRIDGE_REMOVE(_tag) \
MCFG_DEVICE_REMOVE(_tag)
#endif // __COCOCART_H__
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