The clunky cartridge button is the naming of a defect found on an early build of the US NES. Nintendo later created build 2 with a vertical load pin tongue for the same reason why no other game system adopted this cartridge loading system. With the clunky cartridge button, pin-conduction was poor; therefore NES model-1 had a chance of graphical defects.

Graphical defects caused by this

  • Scrambled screen
  • Bogus detour to other patterns (e.g. parallel vertical lines instead of a horizontal contiguous line).
  • Discoloration

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