Computer Terminology crossword puzzle

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Across
  1. 4. A large circuit board connected to all parts of the computer
  2. 6. An input device which requires clicking
  3. 8. small electronic chip which can calculate different calculations in a billionth of a second
  4. 10. connects computer to printers, scanners,
  5. 13. keyboards, mouse, monitor, touchscreen
  6. 14. Temporary Storage Device
  7. 15. allows high-speed communication between a peripheral and computer
Down
  1. 1. physical parts of a computer
  2. 2. Interpreting the instruction to determine which functions are to be performed
  3. 3. External devices which connect to the computer
  4. 5. First task of a CPU
  5. 7. performs a system check when computer turns on
  6. 9. speaker, printer, monitor
  7. 11. code using the numbers 1 and 0
  8. 12. The brain which carries out all instructions