remove redundant text. The reference is already in the Note below
fix a sentence that didn't sound good
fix the name of the DEC PDP computers
add missed carriage return
remove unnecessary commas on the text
change first chapter's figure 1, add figure's description and attribution to creators in bibliography
reorder bibliography's references in alphabetical order
reset a Note comment in a better position
revise ",and" (comma before and in enumerations) in all chapter's text
correct Apple's OS name from MacOS to Mac OS