\documentstyle[punk,dingbat,%
%varsym,tracefnt,%
color,array,changebar,epsfig]{slides}
% an experiment in scaling up a font
\makeatletter
\declare@font[1.5]{bigzapf}{m}{n}{pzcmi}
\makeatother
\driver{dvips}
\typeout{Using \rmdefault\space as rmdefault}
\typeout{Using \rminvis\space as rminvis}
\typeout{Using \ttinvis\space as ttinvis}
\typeout{Using \lasyinvis\space as lasyinvis}
\typeout{Using \syinvis\space as syinvis}
\typeout{Using \sldefault\space as sldefault}
\typeout{Using \invisdefault\space as invisdefault}
\typeout{Using \ttdefault\space as ttdefault}
\typeout{Using \sfdefault\space as sfdefault}
\extrarowheight=5pt
%
\newenvironment{Slide}[1]%
{\begin{slide}{}\centerline{{\Large\bf\background{\yellow}{#1}}}}{\end{slide}}
\begin{document}
\blackandwhite{tests}
\end{document}