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

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INT 13 - SWBIOS - GET EXTENDED CYLINDER COUNT
        AH = FEh
        DL = drive number (80h, 81h)
Return: CF clear
        DX = number of cylinders beyond 1024 on drive
Notes:  standard INT 13/AH=08h will return a cylinder count truncated to 1024
        BIOS without this extension would return count modulo 1024
        SWBIOS is a TSR by Ontrack Computer Systems; Disk Manager also supports
          these calls
SeeAlso: AH=EEh

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