How to use A4 paper with seminar package and PostScript?

I have a lot of old sizes made with the seminar package and pstricks.

Is it possible to rotate the slide, so it will bit on a A4 paper and still using PostScript?

\documentclass[a4]{seminar}
\usepackage{pstcol,pstricks,pst-text}
\usepackage{fancybox,times,slidesec}
\usepackage{graphicx,amsmath,amsfonts}
\usepackage{semcolor,epsfig,changebar,rotating,multicol}

\newsavebox\headbox
\renewcommand{\makeslideheading}[1]{%
 \gdef\theslideheading{#1}%
 \begin{lrbox}{\headbox}\large\bfseries#1\end{lrbox}%
 \begin{center}\ovalbox{\usebox\headbox}\end{center}}

\newpagestyle{cern}
   {{\color{red}\small \textbf{+}\hfil \today \hfil \textbf{+}}}
   {{\color{black}\small \textbf{+}\hfil \thepage \hfil \textbf{+}}}
\pagestyle{cern}

\date{\vspace{-0.20 cm}2009}
\title{\bf A}

\author{
  开发者_如何学Pythonme
}

\begin{document}

\slideframe{shadow}
%\slideplacement{here}
\setlength\paperwidth{210mm}
\setlength\paperheight{297mm}
\input{sem-page.sty}
\setlength\slidewidth{208mm}
\setlength\slideheight{160mm}
\renewcommand\slideleftmargin{1.0in}
\renewcommand\sliderightmargin{1.0in}

\begin{slide}
\maketitle
\end{slide}

\end{document}

you seem to already have found a decent answer. Another method would be to convert to pdf (ps2pdf) then use the powerful PDF toolkit (pdftk) which is available in the Ubuntu repositories.

Solved the problem with

latex symmetrics.tex
dvips -t landscape symmetrics.dvi
evince symmetrics.ps