\documentclass[a4paper,12pt]{article}
\setlength{\oddsidemargin}{-0.25in}
\setlength{\evensidemargin}{-0.25in}
\setlength{\textwidth}{170mm}
\setlength{\topmargin}{0.25in}
\setlength{\headheight}{0in}
\setlength{\headsep}{0in}
\setlength{\footskip}{0in}
\setlength{\textheight}{240mm}
\pagestyle{empty}
\begin{document}
\begin{center}
{\Large \bf  Repairing HP9800 Desktop Calculators -- Part 3\\
Tony Duell (ard@p850ug1.demon.co.uk)\\}
\end{center}

{ \large 
\noindent
{\Large \bf Memory System Theory of Operation -- Continued\\}
\setcounter{section}{3}
\input{mem30.tex}

Relax...The worst is over. The remaining sections of the machine are much 
easier to understand.

}
\end{document}

