The reason that bi-directional communication works on the Motorola and Scientific Atlanta boxes is because they are OCAP compliant.
In order to be OCAP compliant, TiVo would have to cede control of their user interface over to the cable companies and they justifiably aren't interested in doing so.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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The reason that bi-directional communication works on the Motorola and Scientific Atlanta boxes is because they are OCAP compliant.
In order to be OCAP compliant, TiVo would have to cede control of their user interface over to the cable companies and they justifiably aren't interested in doing so.