X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 13 - disk

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INT 13 - DISK - READ SECTORS INTO MEMORY
        AH = 02h
        AL = number of sectors to read
        CH = track (for hard disk, bits 8,9 in high bits of CL)
        CL = sector (01h to number of sectors/track for drive)
        DH = head
        DL = drive
        ES:BX -> buffer to fill
Return: CF set on error
        AH = status (see AH=01h)
        AL = number of sectors read
Notes:  results undefined if attempting to read zero sectors
        AWARD AT BIOS extended to handle more than 1024 cylinders by placing
          bits 10 and 11 of the cylinder number into bits 6 and 7 of DH
        apparently, the AMI BIOS also follows this convention
SeeAlso: AH=03h,AH=0Ah

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