HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                   INT 13,C - Seek to Cylinder (XT & newer)

       AH = 0C
       CH = low order byte of cylinder number (see below)
       CL = high order byte of cylinder number (see below)
       DH = head number (0-15)
       DL = fixed drive number (80h=drive 0, 81h=drive 1)


       on return:
       AH = status  (see INT 13,STATUS)
       CF = 0 if successful
          = 1 if error


       - many good programming references indicate this function is only
         available on the AT, PS/2 and later systems, but all hard disk
         systems since the XT have this function available
       - notice that CX is in reverse byte format similar to the way data
         is stored in memory and reverse of normal register storage
       - only the disk number is checked for validity
       - the parameters in CX change depending on the number of cylinders;
         the track/cylinder number is a 10 bit value taken from the 2 high
         order bits of CL and the 8 bits in CH (low order 8 bits of track):

         │F│E│D│C│B│A│9│8│7│6│5-0│  CX
          │ │ │ │ │ │ │ │ │ │  └─────  unused
          │ │ │ │ │ │ │ │ └─┴───────  high order 2 bits of track number
          └─┴─┴─┴─┴─┴─┴─┴──────────  low order 8 bits of track number

Esc or Alt-X to exit int 13,c Home/PgUp/PgDn/End ←↑↓→
Converted to HTML in 2006 by Timo Bingmann