// license:GPL-2.0+ // copyright-holders:Dirk Best, Nigel Barnes /*************************************************************************** BBC Micro Disk image formats ***************************************************************************/ #include "bbc_dsk.h" bbc_dfs_format::bbc_dfs_format() : wd177x_format(formats) { } const char *bbc_dfs_format::name() const { return "dfs"; } const char *bbc_dfs_format::description() const { return "Acorn DFS disk image"; } const char *bbc_dfs_format::extensions() const { return "bbc,img,ssd,dsd"; } int bbc_dfs_format::find_size(io_generic *io, UINT32 form_factor) { UINT8 cat[8]; UINT32 sectors0, sectors2; // read sector count from side 0 catalogue io_generic_read(io, cat, 0x100, 8); sectors0 = ((cat[6] & 3) << 8) + cat[7]; UINT64 size = io_generic_size(io); for(int i=0; formats[i].form_factor; i++) { const format &f = formats[i]; if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor) continue; if ((size <= (UINT64)compute_track_size(f) * f.track_count * f.head_count) && (sectors0 == f.track_count * f.sector_count)) { if (f.head_count == 2) { // read sector count from side 2 catalogue if (f.sector_base_id == -1) io_generic_read(io, cat, 0xb00, 8); // interleaved else io_generic_read(io, cat, compute_track_size(f) * f.track_count + 0x100, 8); // sequential sectors2 = ((cat[6] & 3) << 8) + cat[7]; } else { sectors2 = sectors0; } if (sectors0 == sectors2) return i; } } return -1; } int bbc_dfs_format::identify(io_generic *io, UINT32 form_factor) { int type = find_size(io, form_factor); if(type != -1) return 90; return 0; } int bbc_dfs_format::get_image_offset(const format &f, int head, int track) { if (f.sector_base_id == -1) return (track * f.head_count + head) * compute_track_size(f); else return (f.track_count * head + track) * compute_track_size(f); } const bbc_dfs_format::format bbc_dfs_format::formats[] = { { // 100k 40 track single sided single density floppy_image::FF_525, floppy_image::SSSD, floppy_image::FM, 4000, 10, 40, 1, 256, {}, 0, {}, 40, 10, 10 }, { // 200k 80 track single sided single density floppy_image::FF_525, floppy_image::SSQD, floppy_image::FM, 4000, 10, 80, 1, 256, {}, 0, {}, 40, 10, 10 }, { // 200k 40 track double sided single density floppy_image::FF_525, floppy_image::DSSD, floppy_image::FM, 4000, 10, 40, 2, 256, {}, 0, {}, 40, 10, 10 }, { // 200k 40 track double sided single density (interleaved) floppy_image::FF_525, floppy_image::DSSD, floppy_image::FM, 4000, 10, 40, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10 }, { // 400k 80 track double sided single density floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM, 4000, 10, 80, 2, 256, {}, 0, {}, 40, 10, 10 }, { // 400k 80 track double sided single density (interleaved) floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM, 4000, 10, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10 }, {} }; bbc_adfs_format::bbc_adfs_format() : wd177x_format(formats) { } const char *bbc_adfs_format::name() const { return "adfs"; } const char *bbc_adfs_format::description() const { return "Acorn ADFS disk image"; } const char *bbc_adfs_format::extensions() const { return "adf,ads,adm,adl"; } int bbc_adfs_format::find_size(io_generic *io, UINT32 form_factor) { UINT8 map[3]; UINT32 sectors; // read sector count from free space map io_generic_read(io, map, 0xfc, 3); sectors = map[0] + (map[1] << 8) + (map[2] << 16); UINT64 size = io_generic_size(io); for(int i=0; formats[i].form_factor; i++) { const format &f = formats[i]; if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor) continue; // valid images will have sector counts adfs-s = 0x280; adfs-m = 0x500; adfs-l = 0xa00; though many adfs-s images are incorrect if ((size == (UINT64)compute_track_size(f) * f.track_count * f.head_count) && (sectors == 0x280 || sectors == 0x500 || sectors == 0xa00)) { return i; } } return -1; } int bbc_adfs_format::identify(io_generic *io, UINT32 form_factor) { int type = find_size(io, form_factor); if(type != -1) return 100; return 0; } int bbc_adfs_format::get_image_offset(const format &f, int head, int track) { if (f.sector_base_id == -1) return (track * f.head_count + head) * compute_track_size(f); else return (f.track_count * head + track) * compute_track_size(f); } const bbc_adfs_format::format bbc_adfs_format::formats[] = { { // 160K 5 1/4 inch 40 track single sided double density floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM, 2000, 16, 40, 1, 256, {}, 0, {}, 60, 22, 43 }, { // 320K 5 1/4 inch 80 track single sided double density floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM, 2000, 16, 80, 1, 256, {}, 0, {}, 60, 22, 43 }, { // 640K 5 1/4 inch 80 track double sided double density (interleaved) floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 16, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 }, 60, 22, 43 }, { // 160K 3 1/2 inch 40 track single sided double density floppy_image::FF_35, floppy_image::SSDD, floppy_image::MFM, 2000, 16, 40, 1, 256, {}, 0, {}, 60, 22, 43 }, { // 320K 3 1/2 inch 80 track single sided double density floppy_image::FF_35, floppy_image::SSQD, floppy_image::MFM, 2000, 16, 80, 1, 256, {}, 0, {}, 60, 22, 43 }, { // 640K 3 1/2 inch 80 track double sided double density (interleaved) floppy_image::FF_35, floppy_image::DSQD, floppy_image::MFM, 2000, 16, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 }, 60, 22, 43 }, {} }; bbc_dos_format::bbc_dos_format() : wd177x_format(formats) { } const char *bbc_dos_format::name() const { return "dos"; } const char *bbc_dos_format::description() const { return "Acorn DOS disk image"; } const char *bbc_dos_format::extensions() const { return "img,adl"; } int bbc_dos_format::find_size(io_generic *io, UINT32 form_factor) { UINT8 cat[3]; UINT32 sectors; UINT64 size = io_generic_size(io); for(int i=0; formats[i].form_factor; i++) { const format &f = formats[i]; if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor) continue; if (size == (UINT64)compute_track_size(f) * f.track_count * f.head_count) { switch (size) { case 640 * 1024: // 640K Acorn (Bootable) DOS Format // read sector count from free space map - Acorn DOS = 0xaa0 io_generic_read(io, cat, 0xfc, 3); sectors = cat[0] + (cat[1] << 8) + (cat[2] << 16); if (sectors == 0xaa0) { // read media type ID from FAT - Acorn DOS = 0xff if (f.sector_base_id == -1) io_generic_read(io, cat, 0x2000, 1); // interleaved else io_generic_read(io, cat, 0x1000, 1); // sequential if (cat[0] == 0xff) return i; } break; case 800 * 1024: // 800K Acorn DOS Format // read media type ID from FAT - Acorn DOS = 0xfd io_generic_read(io, cat, 0, 1); if (cat[0] == 0xfd) return i; break; } } } return -1; } int bbc_dos_format::identify(io_generic *io, UINT32 form_factor) { int type = find_size(io, form_factor); if(type != -1) return 100; return 0; } int bbc_dos_format::get_image_offset(const format &f, int head, int track) { if (f.sector_base_id == -1) return (track * f.head_count + head) * compute_track_size(f); else return (f.track_count * head + track) * compute_track_size(f); } const bbc_dos_format::format bbc_dos_format::formats[] = { { // 640K 5 1/4 inch 80 track double sided double density - gaps unverified floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 16, 80, 2, 256, {}, 0, {}, 60, 22, 43 }, { // 640K 5 1/4 inch 80 track double sided double density (interleaved) - gaps unverified floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 16, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 }, 60, 22, 43 }, { // 800K 5 1/4 inch 80 track double sided double density - gaps unverified floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 5, 80, 2, 1024, {}, 0, {}, 60, 22, 43 }, {} }; bbc_cpm_format::bbc_cpm_format() : wd177x_format(formats) { } const char *bbc_cpm_format::name() const { return "cpm"; } const char *bbc_cpm_format::description() const { return "Acorn CP/M disk image"; } const char *bbc_cpm_format::extensions() const { return "img,ssd,dsd"; } int bbc_cpm_format::identify(io_generic *io, UINT32 form_factor) { UINT8 h[8]; io_generic_read(io, h, 0, 8); int type = find_size(io, form_factor); if(type != -1 && (memcmp(h, "Acorn CP", 8) == 0 || memcmp(h, "Slogger ", 8) == 0)) { return 100; } return 0; } int bbc_cpm_format::get_image_offset(const format &f, int head, int track) { if (f.sector_base_id == -1) return (track * f.head_count + head) * compute_track_size(f); else return (f.track_count * head + track) * compute_track_size(f); } const bbc_cpm_format::format bbc_cpm_format::formats[] = { { // 400K 5 1/4 inch 80 track double sided single density - gaps unverified floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM, 4000, 5, 80, 2, 512, {}, 0, {}, 40, 10, 10 }, { // 400k 5 1/4 inch 80 track double sided single density (interleaved) - gaps unverified floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM, 4000, 5, 80, 2, 512, {}, -1, { 0,1,2,3,4 }, 40, 10, 10 }, { // 800K 5 1/4 inch 80 track double sided double density - gaps unverified floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 10, 80, 2, 512, {}, 0, {}, 60, 22, 43 }, {} }; bbc_cpn_format::bbc_cpn_format() : wd177x_format(formats) { } const char *bbc_cpn_format::name() const { return "cpn"; } const char *bbc_cpn_format::description() const { return "Torch CPN disk image"; } const char *bbc_cpn_format::extensions() const { return "dsd"; } int bbc_cpn_format::identify(io_generic *io, UINT32 form_factor) { int type = find_size(io, form_factor); if(type != -1) return 50; return 0; } int bbc_cpn_format::get_image_offset(const format &f, int head, int track) { if (f.sector_base_id == -1) return (track * f.head_count + head) * compute_track_size(f); else return (f.track_count * head + track) * compute_track_size(f); } const bbc_cpn_format::format bbc_cpn_format::formats[] = { { // 400k 80 track double sided single density (interleaved) - gaps unverified floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM, 4000, 10, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10 }, {} }; const floppy_format_type FLOPPY_BBC_DFS_FORMAT = &floppy_image_format_creator; const floppy_format_type FLOPPY_BBC_ADFS_FORMAT = &floppy_image_format_creator; const floppy_format_type FLOPPY_BBC_DOS_FORMAT = &floppy_image_format_creator; const floppy_format_type FLOPPY_BBC_CPM_FORMAT = &floppy_image_format_creator; const floppy_format_type FLOPPY_BBC_CPN_FORMAT = &floppy_image_format_creator;