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

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INT 21 - DOS 2+ - IOCTL - GET OUTPUT STATUS
        AX = 4407h
        BX = file or device handle
Return: AL = FFh device ready
             00h device not ready
Note:   for DOS 2.x, files are always ready for output
SeeAlso: AX=4406h,INT 2F/AX=122Bh

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