X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3+ - ioctl

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INT 21 - DOS 3+ - IOCTL - BLOCK DEVICE LOCAL
        AX = 4409h
        BL = drive number (0=default)
Return: DX = attribute word, bit 12 set if device is remote
SeeAlso: AX=4400h,AX=4408h,AX=440Ah,INT 2F/AX=122Bh

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