Crossword puzzle clue "famous communication code"

Here are the possible solutions for famous communication code clue

Answer
Clue
Relevancy
morse
Clue
Famous communication "code"
___ code (system of communication for a telegraph)
___ code (communication system with dots and dashes)
___ code (communication system that uses dots and dashes)
Definition
(French) a walrus
igpayatinlay
Clue
Secret code, in the secret code
sku
Clue
Code hidden in a bar code
konami
Clue
Video game company with the famous up, up, down, down, left, right, left, right, B, A code
Video game company with a famous cheat code

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