DZIP is an interpreter for Infocom and Inform files written in C.  It will
play all but the graphical Z6 format and the all-but-unused Z7 format.  In
addition, QUETZAL save files and gzipped* game files are supported. Except
for the lack of support for the Unicode opcodes, DZIP is a fully compliant
Z-Machine Standard 1.0 interpreter.

It features the following advantages over the most recent version of JZIP,
the interpreter on which it is based:

  * -m (monochrome) and -b (black-and-white) switches are actually used in
    DOS mode.  -m allows underscoring, where -b does not.  Additionally, a
    monochrome adapter will be "automagically" detected.
  * -i switch allows you to emulate any system's interpreter.  There is no
    significant difference, except in "Beyond Zork" (don't even try to use
    the CoCo mode for this game without specifying monochrome mode!).
  * Bugs relating to buffering and text display have been (mostly) fixed !
    These affect some of my own games, such as "Omega Days" and the W.I.P.
    "InformZork" game.

Syntax:  dzip  [-l n] [-c n] [-r n] [-t n] [-k n] [-i n] [-y] [-m | -b | -o]
               [-s n] [-v] [-h] [-z]  filename.ext

     -l n      Number of lines.  This is usually (under DOS anyway)
               "automagically" detected on startup, but if it fails
               and does not pick a good default this can be used to
               force the screen dimensions.
     -c n      Number of columns.  See above.
     -r n      Right margin.  Default is 1.
     -t n      Top margin.  Default is 0.
     -k n      Command history size (0-16384) in bytes.  Default is
               1024 (1K).
     -i n      Interpreter number.  This usually has no effect, but
               games like "Beyond Zork" do care.
     -y        Set the "Tandy bit".  This affects certain Version 3
               games, especially The Witness and Zork I.
     -m        Forces monochrome mode.
     -b        Forces black-and-white mode.
     -o        Forces color mode.
     -s n      Sets the level of STRICTZ error checking.  Normally,
               certain types of errors are ignored (level 0).  When
               you set this, certain game "bugs" will trigger error
               messages in the interpreter or be treated as fatal.
     -v        Displays the version of DZIP.
     -h        Displays help information.
     -z        Displays license information.

 * gzipped files are not supported in the source unless zlib is available
   and USE_ZLIB is defined.  However, the MS-DOS binary does support them
   with a standard build of zlib 1.1.3 used under license.