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// license:LGPL-2.1+
// copyright-holders:Michael Zapf
/****************************************************************************
TI-99 Standard Floppy Disk Controller Card
See ti_fdc.c for documentation
Michael Zapf
September 2010
January 2012: rewritten as class (MZ)
****************************************************************************/
#ifndef __TIFDC__
#define __TIFDC__
#include "machine/wd_fdc.h"
#include "imagedev/floppy.h"
extern const device_type TI99_FDC;
class ti_fdc_device : public ti_expansion_card_device
{
public:
ti_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8Z_MEMBER(readz) override;
DECLARE_WRITE8_MEMBER(write) override;
DECLARE_SETADDRESS_DBIN_MEMBER(setaddress_dbin) override;
DECLARE_READ8Z_MEMBER(crureadz) override;
DECLARE_WRITE8_MEMBER(cruwrite) override;
DECLARE_FLOPPY_FORMATS( floppy_formats );
DECLARE_WRITE_LINE_MEMBER( fdc_irq_w );
DECLARE_WRITE_LINE_MEMBER( fdc_drq_w );
// bool dvena_r();
protected:
void device_start() override;
void device_reset() override;
void device_config_complete() override;
const rom_entry *device_rom_region() const override;
machine_config_constructor device_mconfig_additions() const override;
void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
private:
// Wait state logic
void operate_ready_line();
// Set the current floppy
void set_drive();
// Operate the floppy motors
void set_floppy_motors_running(bool run);
// Recent address
int m_address;
// Holds the status of the DRQ and IRQ lines.
line_state m_DRQ, m_IRQ;
// Needed for triggering the motor monoflop
UINT8 m_lastval;
// Signal DVENA. When TRUE, makes some drive turning.
line_state m_DVENA;
// Set when address is in card area
bool m_inDsrArea;
// When TRUE the CPU is halted while DRQ/IRQ are true.
bool m_WAITena;
// WD chip selected
bool m_WDsel;
// Indicates which drive has been selected. Values are 0, 1, 2, and 4.
// 000 = no drive
// 001 = drive 1
// 010 = drive 2
// 100 = drive 3
int m_DSEL;
// Signal SIDSEL. 0 or 1, indicates the selected head.
line_state m_SIDSEL;
// count 4.23s from rising edge of motor_on
emu_timer* m_motor_on_timer;
// Link to the FDC1771 controller on the board.
required_device<fd1771_t> m_fd1771;
// DSR ROM
UINT8* m_dsrrom;
// Link to the attached floppy drives
floppy_image_device* m_floppy[3];
// Currently selected floppy drive
floppy_image_device* m_current_floppy;
// Debugging
bool m_debug_dataout;
};
#endif
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