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According to version 2.2 of the SCP image specification <https://www.cbmstuff.com/downloads/scp/scp_image_specs.txt> the number of Track Data Entries for a floppy can be up to 168, so that up to 84 tracks can be recorded (e.g., fluxengine -c 0-83). > BYTES 0x10-0x2AF (for floppy image files) are a table of longwords with each entry being > an offset to a Track Data Header (TDH) for each track that is stored in the image. The table > is always sequential. There is an entry for every track, with up to 168 entries supported for > floppy disks. This means that floppy disk images of up to 84 tracks with sides 0/1 are possible.
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#ifndef SCP_H
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#define SCP_H
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struct ScpHeader
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{
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char file_id[3]; // file ID - 'SCP'
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uint8_t version; // major/minor in nibbles
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uint8_t type; // disk type - subclass/class in nibbles
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uint8_t revolutions; // up to 5
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uint8_t start_track; // 0..165
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uint8_t end_track; // 0..165
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uint8_t flags; // see below
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uint8_t cell_width; // in bits, 0 meaning 16
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uint8_t heads; // 0 = both, 1 = side 0 only, 2 = side 1 only
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uint8_t resolution; // 25ns * (resolution+1)
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uint8_t checksum[4]; // of data after this point
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uint8_t track[168][4]; // track offsets, not necessarily 168
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};
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enum
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{
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SCP_FLAG_INDEXED = (1<<0),
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SCP_FLAG_96TPI = (1<<1),
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SCP_FLAG_360RPM = (1<<2),
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SCP_FLAG_NORMALIZED = (1<<3),
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SCP_FLAG_READWRITE = (1<<4),
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SCP_FLAG_FOOTER = (1<<5)
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};
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struct ScpTrackHeader
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{
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char track_id[3]; // 'TRK'
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uint8_t strack; // SCP track number
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};
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struct ScpTrackRevolution
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{
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uint8_t index[4]; // time for one revolution
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uint8_t length[4]; // number of bitcells
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uint8_t offset[4]; // offset to bitcell data, relative to track header
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};
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struct ScpTrack
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{
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ScpTrackHeader header;
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ScpTrackRevolution revolution[5];
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};
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#endif
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