PC vs visual display unit

PC

noun
  • A personal computer, especially one similar to an IBM PC that runs Microsoft Windows (or, originally, DOS), usually as opposed to (say) an Apple Mac. 

  • A member of the Conservative Party of Canada. 

  • forty-nine (an allusion to a cartoon character, Police Constable 49) 

verb
  • To make politically correct. 

visual display unit

noun
  • A computer display; a screen or monitor that can be connected to a computer. 

How often have the words PC and visual display unit occurred in a corpus of books? (source: Google Ngram Viewer )