Problem with beamer

I was told that processing a file with pdflatex gives the same result as 
processing it with latex, with \pdfoutput1 in the preamble.  They both 
load with "pdftex".  The following file:

\documentclass{beamer}
\pdfoutput1
\title{testfile}
\author{Michael Barr}
\begin{document}
\titlepage
\end{document}

gives quite a different result when processed with latex and pdflatex. 
The latter gives the expected out, while the former produces a white page 
with a large black square in the upper left quadrant.  When \pdfoutput is 
changed to 0, they give the same dvi file.  This is Miktex 2.8, by the 
way.

I am asking this more out of interest, since I can always process it using 
pdflatex, but I like to track these things down when I can.

Michael Barr

-- 
The modern conservative is engaged in one of man's oldest exercises in
moral philosophy--the search for a superior moral justification
for selfishness.  --J.K. Galbraith

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