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Keyboard, 251 , 357 
  Caps lock, 359 
  communications, 357 
  errors, 359 
  ghosting, 253 
  hard reset, 361 
  keycodes, 358 
    transmission, 358 
  matrix, 362 
  out-of-sync, 359 
  power up, 360 
  raw keycodes, 251 
  reading, 251 
  reset warning, 361 
  self test, 360 
  signals, 6 , 357 
  special codes, 364 
  timing diagram, 358