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d64.doc
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Text File
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1994-10-09
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1KB
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40 lines
D64 File Structure was developed by Miha Peternel for use in C64S.
D64 file contains all sectors as they appear on the 1541 formatted disk.
Each sector is 256 bytes long. Error information (1 byte per sector)
can be added in the end of file.
__________________________________
File types currently supported
174848 bytes = 35 tracks
175531 bytes = 35 tracks + 683 bytes error information
196608 bytes = 40 tracks
197376 bytes = 40 tracks + 768 bytes error information
_______________
Track sizes
Tracks, size
1-17 21 sectors * 256 bytes
18-24 19 sectors * 256 bytes
25-30 18 sectors * 256 bytes
31-35 17 sectors * 256 bytes
*36-40* 17 sectors * 256 bytes
Tracks 36-40 are non-standard.
____________________________________
Actual layout for 35 track image
Offset, size, description
0*256, 256 track 1, sector 0
1*256, 256 track 1, sector 1
...
20*256, 256 track 1, sector 20
21*256, 256 track 2, sector 0
...
682*256, 256 track 35, sector 16
683*256, 683 error info (byte per sector in the same order)