hack 2021 Puzzle

1234567
Across
  1. 3. this name come from A medieval Scandinavian king
  2. 4. US Air Force used their game consoles to build a supercomputer
  3. 6. Initial name given to Mario charater
  4. 7. company which invented Ethernet networking
Down
  1. 1. landscape wallpaper that was a default on Windows XP
  2. 2. first cross-platform web browser
  3. 5. Founded in 1889, this company start by selling playing cards