Computer Science 01

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Across
  1. 3. requires power to retain its contents
  2. 4. non-volatile memory
  3. 5. xxx systems designed to perform a singular task.
  4. 8. uses lasers to read and write data to discs
  5. 10. xxx drive magnetic storage
  6. 11. store data using magnetic layers
  7. 12. xxx systems are Easier to design - cheaper to produce - more efficient than none dedicated system + computers built into other devices.
  8. 15. Performs all of the maths and Boolean logic operations
  9. 16. xxxxx xx xxx is determined by clock speed – number of cores – amount of cache
  10. 19. xxxxxx xxxx xxxxxxxx holds the instruction to be decoded by the controlunit or it can hold data waiting to be written to memory
  11. 20. MDR and the MAR are examples of these
  12. 21. smallest unit of measurement for data transfer
  13. 23. used as the MAIN MEMORY in a computer and is loaded with, operating + system applications + data files
  14. 24. main circuit board which other devices such as RAM and CPU plug into
  15. 26. xxx unit is responsible for controlling data flow in and out of the CPU and around the computer system. It contains the PC program counter
Down
  1. 1. xxxxx xxxxx smaller and faster access speeds that hard drives, memory stick is an example
  2. 2. xxxxxx xxxxxxx xxxxxxxx holds the memory address which is loaded
  3. 6. xxxxx xxxxx the number of instructions a single processor core can carry out per second measured in Hertz Hz
  4. 7. optical storage media
  5. 9. stores intermediate results of calculations (within the ALU) Arithmetic and Logic Unit.
  6. 13. unit of measurement for data storage
  7. 14. xxxxxxx xxxxxx is required when, The amount of free RAM is too low it uses secondary storage as RAM + very slow due to use of secondary storage
  8. 17. Very fast - expensive memory within the CPU. Doesn’t speed up the CPU. Lower capacity than RAM + Stores regularly used data – so the CPU can access it quickly next time needed.
  9. 18. xxxxxxx xxxxxxx holds the address of the next instruction to be fetched
  10. 22. contains the instructions to boot the system.
  11. 25. each xxx can independently process data. The more xxx the more instructions it can carry out per second - most PC’s have 4 to 8 of these