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As for the S-card slot in your Dad's Sharp, it should still be able to take any Cablecard. M-cards have to be backward compatible with S-card devices. But, you are correct when you state it's hard to find a TV with Cablecard slot these days. I rent an M-card and it costs $2/month.

He got one. He tried to make it work. It failed. I tried. It still failed. According to Google, we found many people complaining that it wouldn't work with M-cards. This set is circa 2006 or thereabouts, so it's not like there's an update coming from Sharp.

Anyway, it's just sad that CableCard failed in the market. They used to build it into TVs, but no longer.