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  The original Inside Macintosh library of books appeared in six volumes from
  1985 to 1991. Those volumes each focused on a particular version of the
  system software, sometimes prompted by the release of new hardware
  configurations. Often, the later volumes of the original Inside Macintosh
  described only new system software components or changes to existing
  system software components.

  The new Inside Macintosh books are intended to replace the original Inside
  Macintosh books and to provide a more complete and more useful reference to
  the Macintosh system software. The most obvious improvement in the new
  books is that they are organized principally by topic. For example, the book
  Inside Macintosh: Files contains virtually all the available information related to
  files, including complete descriptions of the File Manager, the Standard File
  Package, the Alias Manager, and the Disk Initialization Manager. Similarly,
  the book Inside Macintosh: Text contains all information about handling text.
  This topic-oriented organization of books makes it easier for you to find the
  information you need. It also makes it easier for Apple to add books to the
  Inside Macintosh suite as new technologies emerge in the years ahead.