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diff --git a/src/lib/formats/img_dsk.h b/src/lib/formats/img_dsk.h
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+// license:BSD-3-Clause
+// copyright-holders: F. Ulivi
+/*********************************************************************
+
+ img_dsk.h
+
+ "IMG" disk format for SSDD Intel MDS-II 8" disks
+
+*********************************************************************/
+#ifndef MAME_FORMATS_IMG_DSK_H
+#define MAME_FORMATS_IMG_DSK_H
+
+#pragma once
+
+#include "flopimg.h"
+
+#include <vector>
+
+// Geometry constants
+constexpr unsigned IMG_TRACKS = 77;
+constexpr unsigned IMG_HEADS = 1;
+constexpr unsigned IMG_SECTORS = 52;
+constexpr unsigned IMG_SECTOR_SIZE = 128;
+
+class img_format : public floppy_image_format_t
+{
+public:
+ img_format();
+
+ virtual int identify(io_generic *io, uint32_t form_factor) override;
+ virtual bool load(io_generic *io, uint32_t form_factor, floppy_image *image) override;
+ virtual bool save(io_generic *io, floppy_image *image) override;
+ virtual const char *name() const override;
+ virtual const char *description() const override;
+ virtual const char *extensions() const override;
+ virtual bool supports_save() const override;
+
+private:
+ uint16_t m_crc;
+
+ void write_mmfm_bit(std::vector<uint32_t> &buffer , bool data_bit , bool clock_bit);
+ void write_mmfm_byte(std::vector<uint32_t> &buffer , uint8_t data , uint8_t clock = 0);
+ void write_sync(std::vector<uint32_t> &buffer);
+ void write_crc(std::vector<uint32_t> &buffer , uint16_t crc);
+ void write_gap(std::vector<uint32_t> &buffer , unsigned size_00 , unsigned size_ff);
+ void write_sector(std::vector<uint32_t> &buffer , uint8_t track_no , uint8_t sect_no , const uint8_t *sect_data);
+ void fill_with_gap4(std::vector<uint32_t> &buffer);
+ std::vector<uint8_t> get_next_id_n_block(const uint8_t *bitstream , int bitstream_size , int& pos , int& start_pos);
+ bool get_next_sector(const uint8_t *bitstream , int bitstream_size , int& pos , unsigned& track , unsigned& head , unsigned& sector , uint8_t *sector_data);
+};
+
+extern const floppy_format_type FLOPPY_IMG_FORMAT;
+
+#endif // MAME_FORMATS_IMG_DSK_H