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The XBC, or the Xport Botball Controller, is a robot based on Charmed Labs' Xport hardware. It was built specifically for the Botball competition and uses a Game Boy Advance for its display and for high-level processing; a Field-Programmable Gate Array is used to offload low-level processing of motors and sensors from the Game Boy Advance. The XBC is programmed using Interactive C, which is a variant of the C programming language. The XBC replaced the RCX in 2005 as Botball's official processor. The RCX can be programmed using Interactive C, Not Quite C, or Lego's simple GUI interface. Both robots can have bases built with Lego pieces.