Read 1 sector from floppy disk
Write 1 sector to floppy disk
Start and stop motor when read from/write to floppy disk
Write back data to floppy disk
Write back to FD when file deleted
Merge branch 'fdc2'
Add comment
Load file from disk image
Put dot unless file extension is empty
Add fseek and ftell standard functions
Return NULL when fopen failed
Add fgets function
Add floor and ceil functions