Crossword Puzzle

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Across
  1. 2. Unit that performs mathematical operations (3 letters)
  2. 3. To get instruction from memory (5 letters)
  3. 6. Main circuit board (11 letters)
  4. 9. Small memory bank in CPU (8 letters)
  5. 10. Basic programming that controls CPU directly (7 letters)
Down
  1. 1. Very fast memory in CPU (5 letters)
  2. 4. Signal that controls CPU timing (5 letters)
  3. 5. Independent processing unit in modern CPU (4 letters)
  4. 7. To run or carry out an instruction (7 letters)
  5. 8. Memory location (7 letters)