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Keep in mind guys that the Keyboard Component add-on is completely different from the later Enhanced Computer System (ECS) add-on. The Keyboard Component was very fancy ("overengineered," perhaps is a more appropriate term) and only about 4,000 were produced before being recalled. The ECS was much simpler and readily available everywhere. That's the one with the piano keyboard and the styling like the Intellivision II. I wrote a definitive Intellivision article with Matt back in 2008 that goes into all the details: http://www.gamasutra.com/view/feature/3653/a_history_of_gaming_platforms... . Among the ECS's interesting features was doubling the Intellivision's sound channel from 3 to an impressive 6, and doubling the number of available controller ports to four...
The Keyboard Component is the one that easily sells for $3,000 or more. An ECS without the piano sometimes struggles to sell at close to $100. With the piano, it can sometimes get past the $100 mark...
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