mirror of
https://github.com/holub/mame
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157 lines
3.5 KiB
C++
157 lines
3.5 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Olivier Galibert, R. Belmont
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/*********************************************************************
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formats/concept_dsk.c
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Formats for Corvus Concept
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5.25" DSDD is PC MFM, 77 tracks, double-sided, with 9 sectors per track
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*********************************************************************/
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#include <assert.h>
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#include "flopimg.h"
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#include "formats/concept_dsk.h"
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/* 9 sectors / track, 512 bytes per sector */
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const floppy_image_format_t::desc_e cc525dsdd_format::cc_9_desc[] = {
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{ MFM, 0x4e, 80 },
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{ MFM, 0x00, 12 },
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{ RAW, 0x5224, 3 },
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{ MFM, 0xfc, 1 },
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{ MFM, 0x4e, 50 },
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{ MFM, 0x00, 12 },
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{ SECTOR_LOOP_START, 1, 9 },
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{ CRC_CCITT_START, 1 },
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{ RAW, 0x4489, 3 },
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{ MFM, 0xfe, 1 },
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{ TRACK_ID },
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{ HEAD_ID },
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{ SECTOR_ID },
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{ SIZE_ID },
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{ CRC_END, 1 },
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{ CRC, 1 },
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{ MFM, 0x4e, 22 },
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{ MFM, 0x00, 12 },
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{ CRC_CCITT_START, 2 },
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{ RAW, 0x4489, 3 },
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{ MFM, 0xfb, 1 },
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{ SECTOR_DATA, -1 },
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{ CRC_END, 2 },
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{ CRC, 2 },
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{ MFM, 0x4e, 84 },
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{ MFM, 0x00, 12 },
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{ SECTOR_LOOP_END },
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{ MFM, 0x4e, 170 },
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{ END }
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};
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cc525dsdd_format::cc525dsdd_format()
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{
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}
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const char *cc525dsdd_format::name() const
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{
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return "img";
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}
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const char *cc525dsdd_format::description() const
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{
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return "Corvus Concept 5.25\" DSDD floppy disk image";
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}
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const char *cc525dsdd_format::extensions() const
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{
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return "img";
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}
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bool cc525dsdd_format::supports_save() const
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{
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return true;
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}
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void cc525dsdd_format::find_size(io_generic *io, UINT8 &track_count, UINT8 &head_count, UINT8 §or_count)
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{
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UINT64 size = io_generic_size(io);
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track_count = 77;
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head_count = 2;
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sector_count = 9;
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UINT32 expected_size = 512 * track_count*head_count*sector_count;
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if (size == expected_size)
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{
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return;
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}
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track_count = head_count = sector_count = 0;
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}
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int cc525dsdd_format::identify(io_generic *io, UINT32 form_factor)
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{
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UINT8 track_count, head_count, sector_count;
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find_size(io, track_count, head_count, sector_count);
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if(track_count)
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return 50;
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return 0;
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}
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bool cc525dsdd_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
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{
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UINT8 track_count, head_count, sector_count;
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find_size(io, track_count, head_count, sector_count);
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UINT8 sectdata[10*512];
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desc_s sectors[10];
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for(int i=0; i<sector_count; i++) {
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sectors[i+1].data = sectdata + 512*i;
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sectors[i+1].size = 512;
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sectors[i+1].sector_id = i+1;
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}
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int track_size = sector_count*512;
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for(int track=0; track < track_count; track++) {
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for(int head=0; head < head_count; head++) {
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io_generic_read(io, sectdata, (track*head_count + head)*track_size, track_size);
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generate_track(cc_9_desc, track, head, sectors, sector_count, 100000, image);
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}
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}
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image->set_variant(floppy_image::DSDD);
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return true;
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}
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bool cc525dsdd_format::save(io_generic *io, floppy_image *image)
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{
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int track_count, head_count, sector_count;
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get_geometry_mfm_pc(image, 2000, track_count, head_count, sector_count);
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if(track_count != 77)
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track_count = 77;
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// Happens for a fully unformatted floppy
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if(!head_count)
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head_count = 2;
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if(sector_count != 9)
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sector_count = 9;
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UINT8 sectdata[9*512];
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int track_size = sector_count*512;
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for(int track=0; track < track_count; track++) {
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for(int head=0; head < head_count; head++) {
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get_track_data_mfm_pc(track, head, image, 2000, 512, sector_count, sectdata);
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io_generic_write(io, sectdata, (track*head_count + head)*track_size, track_size);
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}
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}
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return true;
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}
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const floppy_format_type FLOPPY_CONCEPT_525DSDD_FORMAT = &floppy_image_format_creator<cc525dsdd_format>;
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