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Diffstat (limited to 'src/lib/formats/dip_dsk.cpp')
-rw-r--r-- | src/lib/formats/dip_dsk.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/lib/formats/dip_dsk.cpp b/src/lib/formats/dip_dsk.cpp new file mode 100644 index 00000000000..e7c7aa072e9 --- /dev/null +++ b/src/lib/formats/dip_dsk.cpp @@ -0,0 +1,97 @@ +// license:BSD-3-Clause +// copyright-holders:Fabio Priuli +/********************************************************************* + + formats/dip_dsk.h + + PC98 DIP disk images + + 0x100 header, followed by track data + + TODO: + - Investigate header structure + - can this format be used to support different disc types? + +*********************************************************************/ + +#include <assert.h> + +#include "dip_dsk.h" + +dip_format::dip_format() +{ +} + +const char *dip_format::name() const +{ + return "dip"; +} + +const char *dip_format::description() const +{ + return "DIP disk image"; +} + +const char *dip_format::extensions() const +{ + return "dip"; +} + +int dip_format::identify(io_generic *io, UINT32 form_factor) +{ + UINT64 size = io_generic_size(io); + + if (size == 0x134000 + 0x100) + return 100; + + return 0; +} + +bool dip_format::load(io_generic *io, UINT32 form_factor, floppy_image *image) +{ + int heads, tracks, spt, bps; + + //For the moment we only support this disk structure... + //2 sides, 77 tracks, 8 sectors/track, 1024 bytes/sector = 1261568 bytes (360rpm) + heads = 2; + tracks = 77; + spt = 8; + bps = 1024; + + int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666; + + int ssize; + for (ssize = 0; (128 << ssize) < bps; ssize++); + + desc_pc_sector sects[256]; + UINT8 sect_data[65536]; + + for (int track = 0; track < tracks; track++) + for (int head = 0; head < heads; head++) + { + io_generic_read(io, sect_data, 0x100 + bps * spt * (track * heads + head), bps * spt); + + for (int i = 0; i < spt; i++) + { + sects[i].track = track; + sects[i].head = head; + sects[i].sector = i + 1; + sects[i].size = ssize; + sects[i].actual_size = bps; + sects[i].deleted = false; + sects[i].bad_crc = false; + sects[i].data = sect_data + i * bps; + } + + build_pc_track_mfm(track, head, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, bps)); + } + + return true; +} + +bool dip_format::supports_save() const +{ + return false; +} + +const floppy_format_type FLOPPY_DIP_FORMAT = &floppy_image_format_creator<dip_format>; |