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

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INT 21 - DOS - GET FILE SIZE
        AH = 23h
        DS:DX -> unopened FCB (see AH=0Fh) with filename and record size
                 fields initialized
Return: AL = status
            00h file found
            FFh file not found
Note:   FCB's random-record field set to number of records (rounded up)
SeeAlso: AH=42h

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