127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
/*
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* 1541job.h - Emulation of 1541 GCR disk reading/writing
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _1541JOB_H
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#define _1541JOB_H
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class MOS6502_1541;
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class Prefs;
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struct Job1541State;
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class Job1541 {
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public:
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Job1541(uint8 *ram1541);
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~Job1541();
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void GetState(Job1541State *state);
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void SetState(Job1541State *state);
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void NewPrefs(Prefs *prefs);
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void MoveHeadOut(void);
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void MoveHeadIn(void);
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bool SyncFound(void);
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uint8 ReadGCRByte(void);
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uint8 WPState(void);
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void WriteSector(void);
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void FormatTrack(void);
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private:
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void open_d64_file(char *filepath);
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void close_d64_file(void);
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bool read_sector(int track, int sector, uint8 *buffer);
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bool write_sector(int track, int sector, uint8 *buffer);
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void format_disk(void);
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int secnum_from_ts(int track, int sector);
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int offset_from_ts(int track, int sector);
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void gcr_conv4(uint8 *from, uint8 *to);
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void sector2gcr(int track, int sector);
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void disk2gcr(void);
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uint8 *ram; // Pointer to 1541 RAM
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FILE *the_file; // File pointer for .d64 file
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int image_header; // Length of .d64/.x64 file header
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uint8 id1, id2; // ID of disk
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uint8 error_info[683]; // Sector error information (1 byte/sector)
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uint8 *gcr_data; // Pointer to GCR encoded disk data
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uint8 *gcr_ptr; // Pointer to GCR data under R/W head
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uint8 *gcr_track_start; // Pointer to start of GCR data of current track
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uint8 *gcr_track_end; // Pointer to end of GCR data of current track
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int current_halftrack; // Current halftrack number (2..70)
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bool write_protected; // Flag: Disk write-protected
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bool disk_changed; // Flag: Disk changed (WP sensor strobe control)
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};
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// 1541 GCR state
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struct Job1541State {
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int current_halftrack;
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uint32 gcr_ptr;
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bool write_protected;
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bool disk_changed;
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};
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/*
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* Check if R/W head is over SYNC
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*/
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inline bool Job1541::SyncFound(void)
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{
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if (*gcr_ptr == 0xff)
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return true;
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else {
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gcr_ptr++; // Rotate disk
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if (gcr_ptr == gcr_track_end)
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gcr_ptr = gcr_track_start;
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return false;
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}
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}
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/*
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* Read one GCR byte from disk
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*/
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inline uint8 Job1541::ReadGCRByte(void)
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{
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uint8 byte = *gcr_ptr++; // Rotate disk
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if (gcr_ptr == gcr_track_end)
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gcr_ptr = gcr_track_start;
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return byte;
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}
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/*
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* Return state of write protect sensor
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*/
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inline uint8 Job1541::WPState(void)
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{
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if (disk_changed) { // Disk change -> WP sensor strobe
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disk_changed = false;
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return write_protected ? 0x10 : 0;
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} else
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return write_protected ? 0 : 0x10;
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}
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#endif
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