mirror of
https://github.com/holub/mame
synced 2025-06-02 19:06:43 +03:00
167 lines
4.3 KiB
C++
167 lines
4.3 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Curt Coder
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/**********************************************************************
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Commodore 2040 floppy disk controller emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#pragma once
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#ifndef __C2040_FLOPPY__
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#define __C2040_FLOPPY__
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#include "emu.h"
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#include "formats/d64_dsk.h"
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#include "formats/d67_dsk.h"
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#include "formats/g64_dsk.h"
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#include "imagedev/floppy.h"
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_C2040_SYNC_CALLBACK(_write) \
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devcb = &c2040_fdc_t::set_sync_wr_callback(*device, DEVCB_##_write);
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#define MCFG_C2040_READY_CALLBACK(_write) \
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devcb = &c2040_fdc_t::set_ready_wr_callback(*device, DEVCB_##_write);
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#define MCFG_C2040_ERROR_CALLBACK(_write) \
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devcb = &c2040_fdc_t::set_error_wr_callback(*device, DEVCB_##_write);
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> c2040_fdc_t
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class c2040_fdc_t : public device_t
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{
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public:
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// construction/destruction
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c2040_fdc_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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template<class _Object> static devcb_base &set_sync_wr_callback(device_t &device, _Object object) { return downcast<c2040_fdc_t &>(device).m_write_sync.set_callback(object); }
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template<class _Object> static devcb_base &set_ready_wr_callback(device_t &device, _Object object) { return downcast<c2040_fdc_t &>(device).m_write_ready.set_callback(object); }
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template<class _Object> static devcb_base &set_error_wr_callback(device_t &device, _Object object) { return downcast<c2040_fdc_t &>(device).m_write_error.set_callback(object); }
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DECLARE_READ8_MEMBER( read );
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DECLARE_WRITE8_MEMBER( write );
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DECLARE_WRITE_LINE_MEMBER( drv_sel_w );
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DECLARE_WRITE_LINE_MEMBER( mode_sel_w );
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DECLARE_WRITE_LINE_MEMBER( rw_sel_w );
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DECLARE_WRITE_LINE_MEMBER( mtr0_w );
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DECLARE_WRITE_LINE_MEMBER( mtr1_w );
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DECLARE_READ_LINE_MEMBER( wps_r ) { return checkpoint_live.drv_sel ? m_floppy1->wpt_r() : m_floppy0->wpt_r(); }
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DECLARE_READ_LINE_MEMBER( sync_r ) { return checkpoint_live.sync; }
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void stp0_w(int stp);
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void stp1_w(int stp);
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void ds_w(int ds);
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void set_floppy(floppy_image_device *floppy0, floppy_image_device *floppy1);
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protected:
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// device-level overrides
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virtual void device_start();
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virtual void device_reset();
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virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
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// optional information overrides
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virtual const rom_entry *device_rom_region() const;
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void stp_w(floppy_image_device *floppy, int mtr, int &old_stp, int stp);
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enum {
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IDLE,
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RUNNING,
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RUNNING_SYNCPOINT
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};
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struct live_info {
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attotime tm;
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int state, next_state;
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int sync;
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int ready;
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int error;
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int ds;
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int drv_sel;
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int mode_sel;
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int rw_sel;
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int odd_hd;
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attotime edge;
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UINT16 shift_reg;
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int cycle_counter;
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int cell_counter;
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int bit_counter;
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UINT8 e;
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offs_t i;
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UINT8 pi;
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UINT16 shift_reg_write;
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attotime write_start_time;
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attotime write_buffer[32];
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int write_position;
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};
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devcb_write_line m_write_sync;
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devcb_write_line m_write_ready;
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devcb_write_line m_write_error;
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required_memory_region m_gcr_rom;
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floppy_image_device *m_floppy0;
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floppy_image_device *m_floppy1;
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int m_mtr0;
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int m_mtr1;
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int m_stp0;
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int m_stp1;
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int m_ds;
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int m_drv_sel;
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int m_mode_sel;
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int m_rw_sel;
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int m_odd_hd;
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UINT8 m_pi;
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attotime m_period;
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live_info cur_live, checkpoint_live;
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emu_timer *t_gen;
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floppy_image_device* get_floppy();
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void live_start();
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void checkpoint();
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void rollback();
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bool write_next_bit(bool bit, const attotime &limit);
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void start_writing(const attotime &tm);
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void commit(const attotime &tm);
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void stop_writing(const attotime &tm);
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void live_delay(int state);
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void live_sync();
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void live_abort();
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void live_run(const attotime &limit = attotime::never);
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void get_next_edge(const attotime &when);
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int get_next_bit(attotime &tm, const attotime &limit);
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};
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// device type definition
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extern const device_type C2040_FDC;
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#endif
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