Computer science

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Across
  1. 1. co-created unix operating system in 1969
  2. 6. main memory in computer
  3. 8. year in which '@' chosen for email addresses
  4. 9. in which year internet was first implemented
Down
  1. 2. main circuit board in computer
  2. 3. cache memory acts between
  3. 4. debut of the first IBM personal computer
  4. 5. program that catalogs websites
  5. 7. Operating system produce by IBM