RequestBlock (PVIOD) - in/out

      Request block.

      The address of the video-state structures consisting of six different structures depending on the request type:

        Type

          Definition
        0
          Get palette registers
        1
          Get overscan (border) color
        2
          Get blink and background intensity switch
        3
          Get color registers
        4
          Reserved
        5
          Get the scan line for underlining
        6
          Get target VioSetMode display configuration
        The six structures, depending on request type, are:

        • VIOPALSTATE 
            VIOOVERSCAN
          
            VIOINTENSITY
          
            VIOCOLORREG
          
            VIOSETULINELOC
          
            VIOSETTARGET

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