frodo-wii/Src/1541job.h
2009-01-13 18:46:42 +00:00

127 lines
3.1 KiB
C++

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