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-rw-r--r--src/lib/formats/bbc_dsk.cpp358
1 files changed, 358 insertions, 0 deletions
diff --git a/src/lib/formats/bbc_dsk.cpp b/src/lib/formats/bbc_dsk.cpp
new file mode 100644
index 00000000000..193ab435e69
--- /dev/null
+++ b/src/lib/formats/bbc_dsk.cpp
@@ -0,0 +1,358 @@
+// 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
+ },
+ {}
+};
+
+const floppy_format_type FLOPPY_BBC_DFS_FORMAT = &floppy_image_format_creator<bbc_dfs_format>;
+const floppy_format_type FLOPPY_BBC_ADFS_FORMAT = &floppy_image_format_creator<bbc_adfs_format>;
+const floppy_format_type FLOPPY_BBC_DOS_FORMAT = &floppy_image_format_creator<bbc_dos_format>;
+const floppy_format_type FLOPPY_BBC_CPM_FORMAT = &floppy_image_format_creator<bbc_cpm_format>;