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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                                                    %%
%%                     A S C I I    wall chart                        %%
%%                                                                    %%
%% by Victor Eijkhout                                                 %%
%% victor@eijkhout.net                                                %%
%%                                                                    %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Copyright 2009 Victor Eijkhout
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained'.
% 
% The Current Maintainer of this work is Victor Eijkhout.
%
% This work consists of this file.
%
%% Choose your favourite format:
%
\nopagenumbers %% 2 lines
\vsize=28cm    %% for PLAIN TeX
%\documentstyle{article}            %% 4 lines for LaTeX
%\begin{document}                   %% not that it matters anything,
%\pagestyle{empty}                  %% rest of the document
%\setlength{\textheight}{28cm}      %% is 'pure' TeX.
%%%%%% and don't forget the \bye / \end{document} at the end!! %%%%%%%
%% fonts
\font\bitfont=cmr7 \fontdimen3\bitfont=3mm
\font\codefont=cmr5
\font\namefont=cmss10 scaled 1200
\font\titlefont=cmss10 scaled 1440
\font\commentfont=cmss10
%% counts and dimens
\newdimen\thinlinewidth \thinlinewidth=.25mm
\newdimen\fatlinewidth \fatlinewidth=.5mm
\newdimen\rowheight \rowheight=1cm
\newdimen\colwidth  \colwidth=1.6cm
\newdimen\Colwidth \Colwidth=2\colwidth
  \advance\Colwidth by \thinlinewidth
\newdimen\topwhite \topwhite=2pt
\newdimen\botwhite \botwhite=3pt
\newdimen\leftwhite \leftwhite=2pt
\newdimen\rightwhite \rightwhite=2pt
\newcount\rowcount \rowcount=-1 %% note!
\newcount\colcount \colcount=0
\newcount\thenumber
%% tidbits
\def\\{$\backslash$}
\def\thinline{\vrule width \thinlinewidth}
\def\fatline{\vrule width \fatlinewidth}
\tolerance=10000
\vbadness=10000
%% code conversion
\def\calcnumber{{\multiply\colcount by 16
                 \advance\colcount by \rowcount
                 \global\thenumber=\colcount}}
\def\deccode{\number\thenumber}
\def\octcode{{\ifnum\thenumber>63
                            \advance\thenumber by -64
                            \count0=\thenumber \divide\count0 by 8
                            1\number\count0
              \else         \count0=\thenumber \divide\count0 by 8
                            \ifnum\count0>0 \number\count0 \fi\fi
              \multiply\count0 by 8
              \advance\thenumber by -\count0
              \number\thenumber}}
\def\hexdigit#1{\ifcase#1 0\or 1\or 2\or 3\or 4\or 5\or 6\or 7\or
                          8\or 9\or A\or B\or C\or D\or E\or F\or
                          \edef\tmp{\message{illegal hex digit
                                        \number#1}}\tmp
                          \fi}
\def\hexcode{{\count0=\thenumber \divide\count0 by 16
              \ifnum\count0>0 \hexdigit{\count0}\fi
              \multiply\count0 by 16
              \advance\thenumber by -\count0 \count0=\thenumber
              \hexdigit{\count0}}}
%% the heading
\def\threebit#1#2#3{\vbox to 1.2\rowheight{\bitfont
                      \vskip\topwhite
                      \hbox to \colwidth{\hskip\leftwhite#1\hfil}
                      \vfil
                      \hbox to \colwidth{\hfil#2\hfil}
                      \vfil
                      \hbox to \colwidth{\hfil#3\hskip\rightwhite}
                      \vskip\botwhite}}
\def\comment#1{\vbox to \colwidth{\hrule height 0mm depth .25mm
                      \vfil
                      \hbox to \Colwidth{\commentfont\hfil#1\hfil}
                      \vfil}}
\def\dcomment#1#2{\vbox to \colwidth{\hrule height 0mm depth .25mm
                      \vfil
                      \hbox to \Colwidth{\commentfont\hfil#1\hfil}
                      \vskip \botwhite
                      \hbox to \Colwidth{\commentfont\hfil#2\hfil}
                      \vfil}}
\def\bithead{\vbox to \colwidth{\hsize=1.5\colwidth
                   \vskip\topwhite
                   \hbox to \hsize{\commentfont\hfil BITS\hfil}
                   \vfil
                   \hbox to \hsize{\bitfont\ b4 b3 b2 b1 }
                   \vskip\botwhite}}
%% routines for single chars
\def\fourbit#1\fb{\vbox to \rowheight{
                     \vfil
                     \hbox to 1.5\colwidth{\bitfont #1\ }
                     \vfil}%
                  \global\advance\rowcount by 1
                  \global\colcount=0}
\def\asc#1\ii{\calcnumber
              \vbox to \rowheight{\offinterlineskip
                     \vskip\topwhite
                     \hbox to \colwidth{\codefont
                                        \hskip\leftwhite
                                        \deccode\hfil}
                     \vfil
                     \hbox to \colwidth{\vrule width 0cm
                                              height 10pt depth 2pt
                                        \namefont
                                        \hfil#1\hfil}
                     \vfil
                     \hbox to \colwidth{\codefont
                                        \hskip\leftwhite
                                        \hexcode\hfil\octcode
                                        \hskip\rightwhite}
                     \vskip\botwhite}%
              \global\advance\colcount by 1}
%%%%%%%%%%%%%%%%% and now the table itself %%%%%%%%%%%%%%%%%%%%%%%%%
\vbox{
\halign{\fourbit#\fb&\fatline\asc#\ii&\thinline\asc#\ii&
                     \fatline\asc#\ii&\thinline\asc#\ii&
                     \fatline\asc#\ii&\thinline\asc#\ii&
                     \fatline\asc#\ii&\thinline\asc#\ii\fatline\cr
          \omit&\multispan8 \hskip\thinlinewidth
                            \titlefont ASCII CONTROL CODE CHART\hfil\cr
    \noalign{\vskip3mm \hrule}
          \omit\hfil\threebit{b7}{b6}{b5}
                 &\omit\fatline\threebit000&\omit\thinline\threebit001%
                 &\omit\fatline\threebit010&\omit\thinline\threebit011%
                 &\omit\fatline\threebit100&\omit\thinline\threebit101%
                 &\omit\fatline\threebit110&\omit\thinline\threebit111%
                                                 \fatline\cr
    \noalign{\vskip-.5mm} %brute force
          \omit\bithead
                 &\omit\fatline\comment{CONTROL}\span\omit
                 &\omit\fatline\dcomment{SYMBOLS}{NUMBERS}\span\omit
                 &\omit\fatline\comment{UPPER CASE}\span\omit
                 &\omit\fatline\comment{LOWER CASE}\span\omit\hfil\fatline\cr
    \noalign{\hrule}
      {} 0 0 0 0&NUL&DLE&SP     &0  &@  &P       &` &p  \cr\noalign{\hrule}
      {} 0 0 0 1&SOH&DC1&!      &1  &A  &Q       &a &q  \cr\noalign{\hrule}
      {} 0 0 1 0&STX&DC2&"      &2  &B  &R       &b &r  \cr\noalign{\hrule}
      {} 0 0 1 1&ETX&DC3&\#     &3  &C  &S       &c &s  \cr\noalign{\hrule}
      {} 0 1 0 0&EOT&DC4&\$     &4  &D  &T       &d &t  \cr\noalign{\hrule}
      {} 0 1 0 1&ENQ&NAK&\%     &5  &E  &U       &e &u  \cr\noalign{\hrule}
      {} 0 1 1 0&ACK&SYN&\&     &6  &F  &V       &f &v  \cr\noalign{\hrule}
      {} 0 1 1 1&BEL&ETB&'      &7  &G  &W       &g &w  \cr\noalign{\hrule}
      {} 1 0 0 0&BS &CAN&(      &8  &H  &X       &h &x  \cr\noalign{\hrule}
      {} 1 0 0 1&HT &EM &)      &9  &I  &Y       &i &y  \cr\noalign{\hrule}
      {} 1 0 1 0&LF &SUB&*      &:  &J  &Z       &j &z  \cr\noalign{\hrule}
      {} 1 0 1 1&VT &ESC&+      &;  &K  &[       &k &$\{$\cr  \noalign{\hrule}
      {} 1 1 0 0&FF &FS &,      &$<$&L  &\\      &l &$|$ \cr  \noalign{\hrule}
      {} 1 1 0 1&CR &GS &$-$    &=  &M  &]       &m &$\}$\cr  \noalign{\hrule}
      {} 1 1 1 0&SO &RS &.      &$>$&N  &\char94 &n &\char126\cr
                    \noalign{\hrule}
      {} 1 1 1 1&SI &US &/      &?  &O  &\_$\!$\_&o &DEL\cr\noalign{\hrule}
   \noalign{\vskip2mm}
          \omit&\omit\namefont \hfil LEGEND:\hfil \span\omit
          &\multispan4\hskip\fatlinewidth
            \vtop{\vskip-10pt\hbox{\vrule
             \vbox to \rowheight{
                 \offinterlineskip
                 \hrule\vskip \topwhite
                 \hbox to \colwidth{\codefont\hskip\leftwhite
                                       dec\hfil}
                 \vfil
                 \hbox to \colwidth{\namefont\hfil CHAR\hfil}
                 \vfil
                 \hbox to \colwidth{\codefont\hskip\leftwhite
                                       hex\hfil oct
                                       \hskip\rightwhite}
                 \vskip\botwhite
                 \hrule                               }%
                                  \vrule}}
                      \hfil
          &\multispan2\bitfont \hskip\fatlinewidth
                      \vtop{\vskip-8pt\baselineskip=8.5pt
                            \hbox{Victor Eijkhout}
                            \rlap{Dept. of Comp. Sci.}
                            \rlap{University of Tennessee}
                            \rlap{Knoxville TN 37996, USA}
                            }\hfil\cr
          }
}
%%%%%%%%%%%%%%%%%%%%%%% and that's it folks! %%%%%%%%%%%%%%%%%%%%%%%%%%

\bye          %% PLAIN TeX
%\end{document} %% LaTeX