Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 13h Function 0Ch
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     This function is supported on fixed disks only.
 
     The upper 2 bits of the 10-bit cylinder number are placed in the
     upper 2 bits of register CL.
 
     The Read Sector, Read Sector Long, Write Sector, and Write Sector
     Long functions include an implied seek operation and need not be
     preceded by an explicit call to this function.
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