// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************* formats/d64_dsk.c Commodore 4040/1541/1551 sector disk image format http://unusedino.de/ec64/technical/formats/d64.html *********************************************************************/ #include "emu.h" // emu_fatalerror, fatalerror #include "formats/d64_dsk.h" d64_format::d64_format() { formats = file_formats; } d64_format::d64_format(const format *_formats) { formats = _formats; } const char *d64_format::name() const { return "d64"; } const char *d64_format::description() const { return "Commodore 4040/1541/1551 disk image"; } const char *d64_format::extensions() const { return "d64"; } const d64_format::format d64_format::file_formats[] = { { // d64, dos 2, 35 tracks, head 48 tpi, stepper 96 tpi floppy_image::FF_525, floppy_image::SSSD, 683, 35, 1, 256, 9, 8 }, { // d64, dos 2, 40 tracks, head 48 tpi, stepper 96 tpi floppy_image::FF_525, floppy_image::SSSD, 768, 40, 1, 256, 9, 8 }, { // d64, dos 2, 42 tracks, head 48 tpi, stepper 96 tpi floppy_image::FF_525, floppy_image::SSSD, 802, 42, 1, 256, 9, 8 }, {} }; const UINT32 d64_format::cell_size[] = { 4000, // 16MHz/16/4 3750, // 16MHz/15/4 3500, // 16MHz/14/4 3250 // 16MHz/13/4 }; const int d64_format::sectors_per_track[] = { 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, // 1-17 19, 19, 19, 19, 19, 19, 19, // 18-24 18, 18, 18, 18, 18, 18, // 25-30 17, 17, 17, 17, 17, // 31-35 17, 17, 17, 17, 17, // 36-40 17, 17 // 41-42 }; const int d64_format::speed_zone[] = { 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 1-17 2, 2, 2, 2, 2, 2, 2, // 18-24 1, 1, 1, 1, 1, 1, // 25-30 0, 0, 0, 0, 0, // 31-35 0, 0, 0, 0, 0, // 36-40 0, 0 // 41-42 }; int d64_format::find_size(io_generic *io, UINT32 form_factor) const { UINT64 size = io_generic_size(io); for(int i=0; formats[i].sector_count; i++) { const format &f = formats[i]; if(size == (UINT32) f.sector_count*f.sector_base_size*f.head_count) return i; if(size == (UINT32) (f.sector_count*f.sector_base_size*f.head_count) + f.sector_count) return i; } return -1; } int d64_format::identify(io_generic *io, UINT32 form_factor) { int type = find_size(io, form_factor); if (type != -1) return 50; return 0; } int d64_format::get_physical_track(const format &f, int head, int track) { // skip halftracks return track * 2; } int d64_format::get_disk_id_offset(const format &f) { // t18s0 +0xa2 return 0x165a2; } void d64_format::get_disk_id(const format &f, io_generic *io, UINT8 &id1, UINT8 &id2) { UINT8 id[2]; io_generic_read(io, id, get_disk_id_offset(f), 2); id1 = id[0]; id2 = id[1]; } int d64_format::get_image_offset(const format &f, int _head, int _track) { int offset = 0; if (_head) { for (int track = 0; track < f.track_count; track++) { offset += compute_track_size(f, track); } } for (int track = 0; track < _track; track++) { offset += compute_track_size(f, track); } return offset; } int d64_format::compute_track_size(const format &f, int track) { return this->get_sectors_per_track(f, track) * f.sector_base_size; } UINT32 d64_format::get_cell_size(const format &f, int track) { return cell_size[speed_zone[track]]; } int d64_format::get_sectors_per_track(const format &f, int track) { return sectors_per_track[track]; } floppy_image_format_t::desc_e* d64_format::get_sector_desc(const format &f, int ¤t_size, int sector_count, UINT8 id1, UINT8 id2, int gap_2) { static floppy_image_format_t::desc_e desc[] = { /* 00 */ { SECTOR_LOOP_START, 0, -1 }, /* 01 */ { RAWBYTE, 0xff, 5 }, /* 02 */ { GCR5, 0x08, 1 }, /* 03 */ { CRC, 1 }, /* 04 */ { CRC_CBM_START, 1 }, /* 05 */ { SECTOR_ID_GCR5 }, /* 06 */ { TRACK_ID_DOS2_GCR5 }, /* 07 */ { GCR5, id2, 1 }, /* 08 */ { GCR5, id1, 1 }, /* 09 */ { CRC_END, 1 }, /* 10 */ { GCR5, 0x0f, 2 }, /* 11 */ { RAWBYTE, 0x55, f.gap_1 }, /* 12 */ { RAWBYTE, 0xff, 5 }, /* 13 */ { GCR5, 0x07, 1 }, /* 14 */ { CRC_CBM_START, 2 }, /* 15 */ { SECTOR_DATA_GCR5, -1 }, /* 16 */ { CRC_END, 2 }, /* 17 */ { CRC, 2 }, /* 18 */ { GCR5, 0x00, 2 }, /* 19 */ { RAWBYTE, 0x55, gap_2 }, /* 20 */ { SECTOR_LOOP_END }, /* 21 */ { RAWBYTE, 0x55, 0 }, /* 22 */ { RAWBITS, 0x5555, 0 }, /* 23 */ { END } }; current_size = 40 + (1+1+4+2)*10 + (f.gap_1)*8 + 40 + (1+f.sector_base_size+1+2)*10 + gap_2*8; current_size *= sector_count; return desc; } void d64_format::build_sector_description(const format &f, UINT8 *sectdata, UINT32 sect_offs, UINT32 error_offs, desc_s *sectors, int sector_count) const { for (int i = 0; i < sector_count; i++) { sectors[i].data = sectdata + sect_offs; sectors[i].size = f.sector_base_size; sectors[i].sector_id = i; sectors[i].sector_info = sectdata[error_offs]; sect_offs += sectors[i].size; error_offs++; } } void d64_format::fix_end_gap(floppy_image_format_t::desc_e* desc, int remaining_size) { desc[21].p2 = remaining_size / 8; desc[22].p2 = remaining_size & 7; desc[22].p1 >>= remaining_size & 0x01; } bool d64_format::load(io_generic *io, UINT32 form_factor, floppy_image *image) { int type = find_size(io, form_factor); if(type == -1) return false; const format &f = formats[type]; UINT64 size = io_generic_size(io); dynamic_buffer img; if(size == (UINT32)f.sector_count*f.sector_base_size) { img.resize(size + f.sector_count); memset(&img[0], ERROR_00, size + f.sector_count); } else { img.resize(size); } io_generic_read(io, &img[0], 0, size); int track_offset = 0, error_offset = f.sector_count*f.sector_base_size; UINT8 id1 = 0, id2 = 0; get_disk_id(f, io, id1, id2); for (int head = 0; head < f.head_count; head++) { for (int track = 0; track < f.track_count; track++) { int current_size = 0; int total_size = 200000000./this->get_cell_size(f, track); int physical_track = this->get_physical_track(f, head, track); int sector_count = this->get_sectors_per_track(f, track); int track_size = sector_count*f.sector_base_size; int gap2 = this->get_gap2(f, head, track); floppy_image_format_t::desc_e *desc = this->get_sector_desc(f, current_size, sector_count, id1, id2, gap2); int remaining_size = total_size - current_size; if(remaining_size < 0) throw emu_fatalerror("d64_format: Incorrect track layout, max_size=%d, current_size=%d", total_size, current_size); this->fix_end_gap(desc, remaining_size); desc_s sectors[40]; build_sector_description(f, &img[0], track_offset, error_offset, sectors, sector_count); generate_track(desc, physical_track, head, sectors, sector_count, total_size, image); track_offset += track_size; error_offset += sector_count; } } image->set_variant(f.variant); return true; } bool d64_format::save(io_generic *io, floppy_image *image) { const format &f = formats[0]; for(int head=0; head < f.head_count; head++) { for(int track=0; track < f.track_count; track++) { int sector_count = this->get_sectors_per_track(f, track); int track_size = compute_track_size(f, track); UINT8 sectdata[40*256] = { 0 }; desc_s sectors[40]; int offset = get_image_offset(f, head, track); build_sector_description(f, sectdata, 0, 0, sectors, sector_count); extract_sectors(image, f, sectors, track, head, sector_count); io_generic_write(io, sectdata, offset, track_size); } } return true; } void d64_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head, int sector_count) { UINT8 bitstream[500000/8]; UINT8 sectdata[50000]; desc_xs sectors[256]; int physical_track = this->get_physical_track(f, head, track); int cell_size = this->get_cell_size(f, track); int track_size; // Extract the sectors generate_bitstream_from_track(physical_track, head, cell_size, bitstream, track_size, image); extract_sectors_from_bitstream_gcr5(bitstream, track_size, sectors, sectdata, sizeof(sectdata), head, f.track_count); for(int i=0; i;