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

    Intel 8259A

    Programmable Interrupt Controller

                            _____   _____
                   _CS   1 |*    \_/     | 28  VCC
                   _WR   2 |             | 27  A0
                   _RD   3 |             | 26  _INTA
                    D7   4 |             | 25  IR7
                    D6   5 |             | 24  IR6
                    D5   6 |             | 23  IR5
                    D4   7 |    8259A    | 22  IR4
                    D3   8 |             | 21  IR3
                    D2   9 |             | 20  IR2
                    D1  10 |             | 19  IR1
                    D0  11 |             | 18  IR0
                  CAS0  12 |             | 17  INT
                  CAS1  13 |             | 16  _SP/_EN
                   GND  14 |_____________| 15  CAS2

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

#ifndef __PIC8259_H__
#define __PIC8259_H__

#include "devlegcy.h"
#include "devcb.h"

class pic8259_device : public device_t
{
public:
	pic8259_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
	~pic8259_device() { global_free(m_token); }

	// access to legacy token
	void *token() const { assert(m_token != NULL); return m_token; }
protected:
	// device-level overrides
	virtual void device_config_complete();
	virtual void device_start();
	virtual void device_reset();
private:
	// internal state
	void *m_token;
};

extern const device_type PIC8259;


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

struct pic8259_interface
{
	/* Called when int line changes */
	devcb_write_line out_int_func;
	/* 1 - when master, 0 - when slave */
	devcb_read_line sp_en_func;
	/* Called when on master slave irq is trigered*/
	devcb_read8 read_slave_ack_func;
};


/***************************************************************************
    DEVICE CONFIGURATION MACROS
***************************************************************************/

#define MCFG_PIC8259_ADD(_tag, _intrf) \
	MCFG_DEVICE_ADD(_tag, PIC8259, 0) \
	MCFG_DEVICE_CONFIG(_intrf)


/* device interface */
READ8_DEVICE_HANDLER( pic8259_r );
WRITE8_DEVICE_HANDLER( pic8259_w );
int pic8259_acknowledge(device_t *device);

/* interrupt requests */
WRITE_LINE_DEVICE_HANDLER( pic8259_ir0_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir1_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir2_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir3_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir4_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir5_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir6_w );
WRITE_LINE_DEVICE_HANDLER( pic8259_ir7_w );


#endif /* __PIC8259_H__ */