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        Set device information (INT 21h, 4401h)

        Entry:
          AH = 44h
          AL = 1
          BX = Handle
          DX = Device information (DH must be zero)
                 1xxx xxxx xxxx xxxx  Reserved
                 x1xx xxxx xxxx xxxx  1=IOCTL 2-5 allowed
                 xx11 1111 xxxx xxxx  Reserved
                 xxxx xxxx 1xxx xxxx  0=Disk file, 1=Device
                 xxxx xxxx x1xx xxxx  End-of-file
                 xxxx xxxx xx1x xxxx  Binary mode
                 Disk file:
                 xxxx xxxx xxx1 1111  Device number (A=0, B=1 ...)
                 Device:
                 xxxx xxxx xxx1 xxxx  Reserved
                 xxxx xxxx xxxx 1xxx  1=Clock device
                 xxxx xxxx xxxx x1xx  1=Nul device
                 xxxx xxxx xxxx xx1x  1=Console Output device
                 xxxx xxxx xxxx xxx1  1=Console Input device
        Return:
          if CF = 1
                AX = Error Code

See Also: INT 21h, 4400h

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