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Hello, Not sure of what "code" you're referring to that would allow the TV to accept cable, but in order to help I need more info from you:
1) What is the full model number off of the back of the RCA?
2) When you say "cable" are you referring to a direct coaxial cable from the wall, or using a cable box?
3) Whom is your cable provider?
Please read my reply and postback to proceed.