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        Port 3C3  -  VGA Video Subsystem Enable Register

        1111 111x  Reserved
        xxxx xxx1  Video Subsystem enable
                     When this bit is set to 1, the I/O and memory
                     address decoding for the video subsystem are
                     enabled. When set to 0, this bit disables the
                     video I/O and memory address decoding.

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