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// license:BSD-3-Clause
// copyright-holders: F. Ulivi
/*********************************************************************
hp9895.h
HP9895 floppy disk drive
*********************************************************************/
#pragma once
#ifndef _HP9895_H_
#define _HP9895_H_
#include "emu.h"
#include "ieee488.h"
#include "cpu/z80/z80.h"
#include "machine/phi.h"
#include "imagedev/floppy.h"
#include "machine/fdc_pll.h"
class hp9895_device : public device_t,
public device_ieee488_interface
{
public:
// construction/destruction
hp9895_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// device-level overrides
virtual ioport_constructor device_input_ports() const override;
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
virtual const tiny_rom_entry *device_rom_region() const override;
virtual machine_config_constructor device_mconfig_additions() const override;
// device_ieee488_interface overrides
virtual void ieee488_eoi(int state) override;
virtual void ieee488_dav(int state) override;
virtual void ieee488_nrfd(int state) override;
virtual void ieee488_ndac(int state) override;
virtual void ieee488_ifc(int state) override;
virtual void ieee488_srq(int state) override;
virtual void ieee488_atn(int state) override;
virtual void ieee488_ren(int state) override;
// PHI write CBs
DECLARE_WRITE_LINE_MEMBER(phi_eoi_w);
DECLARE_WRITE_LINE_MEMBER(phi_dav_w);
DECLARE_WRITE_LINE_MEMBER(phi_nrfd_w);
DECLARE_WRITE_LINE_MEMBER(phi_ndac_w);
DECLARE_WRITE_LINE_MEMBER(phi_ifc_w);
DECLARE_WRITE_LINE_MEMBER(phi_srq_w);
DECLARE_WRITE_LINE_MEMBER(phi_atn_w);
DECLARE_WRITE_LINE_MEMBER(phi_ren_w);
// PHI DIO r/w CBs
DECLARE_READ8_MEMBER(phi_dio_r);
DECLARE_WRITE8_MEMBER(phi_dio_w);
// PHI IRQ/Z80 NMI
DECLARE_WRITE_LINE_MEMBER(phi_int_w);
// PHI register read & Z80 IRQ
DECLARE_READ8_MEMBER(phi_reg_r);
DECLARE_WRITE16_MEMBER(z80_m1_w);
// Floppy interface
DECLARE_WRITE8_MEMBER(data_w);
DECLARE_WRITE8_MEMBER(clock_w);
DECLARE_WRITE8_MEMBER(reset_w);
DECLARE_WRITE8_MEMBER(leds_w);
DECLARE_WRITE8_MEMBER(cntl_w);
DECLARE_WRITE8_MEMBER(drv_w);
DECLARE_WRITE8_MEMBER(xv_w);
DECLARE_READ8_MEMBER(data_r);
DECLARE_READ8_MEMBER(clock_r);
DECLARE_READ8_MEMBER(drivstat_r);
DECLARE_READ8_MEMBER(switches_r);
DECLARE_READ8_MEMBER(switches2_r);
// Floppy drive interface
void floppy_ready_cb(floppy_image_device *floppy , int state);
private:
required_device<z80_device> m_cpu;
required_device<phi_device> m_phi;
required_device<floppy_connector> m_drives[ 2 ];
required_ioport m_switches;
bool m_cpu_irq;
floppy_image_device *m_current_drive;
unsigned m_current_drive_idx;
bool m_dskchg[ 2 ];
uint16_t m_crc; // U77
bool m_crcerr_syn;
bool m_overrun;
bool m_accdata;
bool m_timeout;
uint8_t m_cntl_reg; // U31
uint8_t m_clock_sr; // U22 & U4
uint8_t m_clock_reg; // U23 & U5
uint8_t m_data_sr; // U24 & U6
uint8_t m_wr_context;
bool m_had_transition;
bool m_lckup;
bool m_amdt;
uint8_t m_sync_cnt; // U28 & U73
attotime m_prev_transition;
bool m_hiden;
bool m_mgnena;
#if 0
// DEBUG DEBUG DEBUG DEBUG
int m_ready[ 2 ];
#endif
// Timers
emu_timer *m_timeout_timer;
emu_timer *m_byte_timer;
emu_timer *m_half_bit_timer;
// PLL
fdc_pll_t m_pll;
uint8_t get_switches2(void) const;
attotime get_half_bit_cell_period(void) const;
floppy_image_device *get_write_device(void) const;
attotime get_time_next_sdok(void) const;
void preset_crc(void);
void update_crc(bool bit);
bool shift_sr(uint8_t& sr , bool input_bit);
void get_next_transition(const attotime& from_when , attotime& edge);
void read_bit(bool crc_upd);
void write_bit(bool data_bit , bool clock_bit);
};
// device type definition
extern const device_type HP9895;
#endif /* _HP9895_H_ */
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