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% use any IBM OEM encoded fixed width font!
\font\screenfont=ncrr-ibm at 7pt
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% These macros are derived from The TeXbook pg 380-381
\def\uncatcodespecials{\def\do##1{\catcode`##1=12 }\dospecials}
\def\setupverbatim{\screenfont%
\def\par{\leavevmode\endgraf\relax}%
\obeylines\uncatcodespecials%
\catcode`\\=0\catcode`\{=1\catcode`\}=2\obeyspaces}
{\obeyspaces\global\let =\ } % let active space be a control space
\def\screenlisting#1{\par\begingroup%
\def\c##1{\char##1}\setupverbatim\input{#1}%
\endgroup}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def\screenbox#1{%
\vbox{\offinterlineskip%
\parskip=0pt\parindent=0pt%
\screenlisting{#1}}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Input converted file '#1' and set it inside a box with '#2' padding
% space around the image.
\def\screendump#1#2{%
\hbox{\vrule%
\vbox{\hrule%
\hbox{\hskip#2%
\vbox{\vskip#2%
\def\twentyxs{xxxxxxxxxxxxxxxxxxxx}%
\setbox0=\hbox{\screenfont\twentyxs\twentyxs\twentyxs\twentyxs}%
\hbox to \wd0{\screenbox{#1}\hss}%
\vskip#2}%
\hskip#2}%
\hrule}%
\vrule\hss}}
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