Inform 6

This is Inform 6.41, copyright (c) Graham Nelson 1993 - 2022, a compiler
for interactive fiction (text adventure games).

Release notes, manuals, executables and more are available from
https://ifarchive.org/indexes/if-archive/infocom/compilers/inform6/.

Introduction

Back in the late 1980s, people began investigating the format of
Infocom’s text adventures. Infocom used a standard format that defined a
virtual machine, which has come to be known as the Z-Machine, to allow
them to be able to port their games to many different computers. This
investigation lead to the creation of open source implementations of the
Z-Machine, such as the InfoTaskForce interpreter, Zip, Frotz, and many
others.

In 1993, Graham Nelson released the first version of Inform, which
compiled a somewhat C-like language (“Inform”) to the Z-Machine. In the
years that followed this led to the creation of hundreds of free games
by a community that had sprung up based around the Usenet group
rec.arts.int-fiction.

The latest version of Inform is Inform 7, but Inform 6 still lives on,
both as the code generator used by Inform 7, and as a language and
compiler in its own right. Inform 6 is now considered stable and only
has bugs fixed and minor, non-breaking features added, but development
continues.

Using Inform 6

To use the compiler, you will need an executable. There are pre-built
executables available, or you can compile the source yourself. There is
no makefile as compilation does not really need one: all that is
required is a C compiler and for it to be invoked with something like

      cc -O2 -o inform *.c

Suitable defaults for various operating systems can be selected by
defining the appropriate symbol, a list of which are near the top of the
“header.h” file (under “Our host machine or OS for today is…”). For
example, to compile for Windows, use

      cc -DPC_WIN32 -O2 -o inform *.c

To write a work of interactive fiction with Inform 6, you will also need
a version of the Inform 6 library. Stable versions of the library are
available, and development of the library continues in a separate
project.

More resources and documentation, including the Inform Designer’s
Manual, are available from the Inform 6 web site.
