%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 7-5-7 on page 361.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}

\renewcommand\rmdefault{cmr}

\StartShownPreambleCommands
\usepackage[utf8]{inputenc}
\usepackage{textcomp} % for Latin interpretation
\StopShownPreambleCommands
\begin{document}
German umlauts in UTF-8:    ^^c3^^a4^^c3^^b6^^c3^^bc
\par\inputencoding{latin1}% switch to Latin 1
But interpreted as Latin 1: ^^c3^^a4^^c3^^b6^^c3^^bc
\end{document}