Logic Gates

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Across
  1. 2. billionaire Bill
  2. 4. when at least one of the input is 1 the output would be 1 which gate am I talking about?
  3. 6. the most common ‘building block’
  4. 8. roundabout journey
Down
  1. 1. reasoning
  2. 3. only works with 2 positives.
  3. 5. exclusive OR
  4. 6. ‘+’ = ‘-’, ‘yes’ = ‘no’, which gate am I talking about?
  5. 7. only works with 2 negatives.