%
% re-define _ to be normal, and to provide a reasonable underscore.
%
\catcode`\_=12
\def\cctwlunder{_}

\catcode`\_=\active
\def\_{_}
\def_{\leavevmode {\tt \char95}}
%
% fix up index commands to deal with active _
% from LATEX.TEX:
% LATEX VERSION 2.09 <4 Aug 1988>, Copyright (C) 1988 by Leslie Lamport

\def\makeindex{\if@filesw \newwrite\@indexfile
  \immediate\openout\@indexfile=\jobname.idx
  \def\index{\let_=\cctwlunder\@bsphack\begingroup
             \def\protect####1{\string####1\space}\@sanitize
             \@wrindex\@indexfile}\typeout
  {Writing index file \jobname.idx }\fi}