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// license:BSD-3-Clause
// copyright-holders:Antoine Mine
/**********************************************************************
Copyright (C) Antoine Mine' 2007
Motorola 6843 Floppy Disk Controller emulation.
**********************************************************************/
#ifndef MC6843_H
#define MC6843_H
#include "imagedev/flopdrv.h"
#define MCFG_MC6843_IRQ_CALLBACK(_write) \
devcb = &mc6843_device::set_irq_wr_callback(*device, DEVCB_##_write);
class mc6843_device : public device_t
{
public:
mc6843_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
~mc6843_device() {}
template<class _Object> static devcb_base &set_irq_wr_callback(device_t &device, _Object object) { return downcast<mc6843_device &>(device).m_write_irq.set_callback(object); }
DECLARE_READ8_MEMBER(read);
DECLARE_WRITE8_MEMBER(write);
void set_drive(int drive);
void set_side(int side);
void set_index_pulse(int index_pulse);
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
private:
enum
{
TIMER_CONT
};
devcb_write_line m_write_irq;
/* registers */
UINT8 m_CTAR; /* current track */
UINT8 m_CMR; /* command */
UINT8 m_ISR; /* interrupt status */
UINT8 m_SUR; /* set-up */
UINT8 m_STRA; /* status */
UINT8 m_STRB; /* status */
UINT8 m_SAR; /* sector address */
UINT8 m_GCR; /* general count */
UINT8 m_CCR; /* CRC control */
UINT8 m_LTAR; /* logical address track (=track destination) */
/* internal state */
UINT8 m_drive;
UINT8 m_side;
UINT8 m_data[128]; /* sector buffer */
UINT32 m_data_size; /* size of data */
UINT32 m_data_idx; /* current read/write position in data */
UINT32 m_data_id; /* chrd_id for sector write */
UINT8 m_index_pulse;
/* trigger delayed actions (bottom halves) */
emu_timer* m_timer_cont;
legacy_floppy_image_device* floppy_image(UINT8 drive);
legacy_floppy_image_device* floppy_image();
void status_update();
void cmd_end();
void finish_STZ();
void finish_SEK();
int address_search(chrn_id* id);
int address_search_read(chrn_id* id);
void finish_RCR();
void cont_SR();
void cont_SW();
};
extern const device_type MC6843;
#endif
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