X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos

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INT 21 - DOS - CLOSE DISK FILE
        AH = 10h
        DS:DX -> FCB (see AH=0Fh)
Return: AL = 00h directory update successful
             FFh file not found in directory
SeeAlso: AH=3Eh

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