// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Commodore 2040 floppy disk controller emulation **********************************************************************/ #ifndef MAME_BUS_IEEE488_C2040FDC_H #define MAME_BUS_IEEE488_C2040FDC_H #pragma once #include "formats/c3040_dsk.h" #include "formats/c4040_dsk.h" #include "formats/d64_dsk.h" #include "formats/g64_dsk.h" #include "imagedev/floppy.h" //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> c2040_fdc_device class c2040_fdc_device : public device_t { public: // construction/destruction c2040_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); auto sync_wr_callback() { return m_write_sync.bind(); } auto ready_wr_callback() { return m_write_ready.bind(); } auto error_wr_callback() { return m_write_error.bind(); } uint8_t read(); void write(uint8_t data); DECLARE_WRITE_LINE_MEMBER( ds0_w ); DECLARE_WRITE_LINE_MEMBER( ds1_w ); DECLARE_WRITE_LINE_MEMBER( drv_sel_w ); DECLARE_WRITE_LINE_MEMBER( mode_sel_w ); DECLARE_WRITE_LINE_MEMBER( rw_sel_w ); DECLARE_WRITE_LINE_MEMBER( mtr0_w ); DECLARE_WRITE_LINE_MEMBER( mtr1_w ); DECLARE_READ_LINE_MEMBER( wps_r ) { return checkpoint_live.drv_sel ? m_floppy1->wpt_r() : m_floppy0->wpt_r(); } DECLARE_READ_LINE_MEMBER( sync_r ) { return checkpoint_live.sync; } void stp0_w(int stp); void stp1_w(int stp); void ds_w(int ds); void set_floppy(floppy_image_device *floppy0, floppy_image_device *floppy1); protected: // device-level overrides virtual void device_start() override; virtual void device_clock_changed() override; virtual void device_reset() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; // optional information overrides virtual const tiny_rom_entry *device_rom_region() const override; void stp_w(floppy_image_device *floppy, int mtr, int &old_stp, int stp); enum { IDLE, RUNNING, RUNNING_SYNCPOINT }; struct live_info { attotime tm; int state, next_state; int sync; int ready; int error; int ds; int drv_sel; int mode_sel; int rw_sel; int odd_hd; attotime edge; uint16_t shift_reg; int cycle_counter; int cell_counter; int bit_counter; uint8_t e; offs_t i; uint8_t pi; uint16_t shift_reg_write; attotime write_start_time; attotime write_buffer[32]; int write_position; }; devcb_write_line m_write_sync; devcb_write_line m_write_ready; devcb_write_line m_write_error; required_memory_region m_gcr_rom; floppy_image_device *m_floppy0; floppy_image_device *m_floppy1; int m_mtr0; int m_mtr1; int m_stp0; int m_stp1; int m_ds; int m_ds0; int m_ds1; int m_drv_sel; int m_mode_sel; int m_rw_sel; int m_odd_hd; uint8_t m_pi; attotime m_period; live_info cur_live, checkpoint_live; emu_timer *t_gen; floppy_image_device* get_floppy(); void live_start(); void checkpoint(); void rollback(); bool write_next_bit(bool bit, const attotime &limit); void start_writing(const attotime &tm); void commit(const attotime &tm); void stop_writing(const attotime &tm); void live_delay(int state); void live_sync(); void live_abort(); void live_run(const attotime &limit = attotime::never); void get_next_edge(const attotime &when); int get_next_bit(attotime &tm, const attotime &limit); }; // device type definition DECLARE_DEVICE_TYPE(C2040_FDC, c2040_fdc_device) #endif // MAME_BUS_IEEE488_C2040FDC_H