


      CDISP(7)                   (Bull-SPS9)                   CDISP(7)



      NAME
           cdisp - Bull-SPS9 color display

      DESCRIPTION
           /dev/cdisp refers to a Bull-SPS9 color display controller
           connected to a Bull-SPS9 color display monitor.

           The device file must be opened for use; only one user may
           access it at a time.  Bytes written to the controller are
           passed to the display immediately.  If the user writes an
           odd number of bytes, the driver automatically appends a
           pad-byte of zero.

           A write that requests input from the device must precede a
           read.

           On a read, pending output finishes, then the device returns
           the number of bytes requested, or the number of bytes
           actually read, whichever is less.


      DEVICE CODE
                                    block-type or  standard
           device type         major     minor     character-type file name

           Bull-SPS9 color display  7    0..3 char      /dev/cdisp

      FILES
           /dev/cdisp
           /drivers/dr11m

      SEE ALSO
           See the Metheus Omega 400 manuals for details on the byte
           sequences to control the color monitor.

      BUGS
           Only an even number of bytes should be requested from the
           device.  (If an odd number is requested, the device will
           reduce the returned bytes by one to return an even number.
           The odd byte in question becomes a "pending byte", and is
           the first byte returned on the next request.)














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