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

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INT 21 - DOS - RANDOM DISK RECORD READ
        AH = 21h
        DS:DX -> FCB (see AH=0Fh)
Return: AL = status
            00h successful read
            01h end of file
            02h data transfer area too small
            03h partial record, EOF
SeeAlso: AH=3Fh

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