% These macros cribbed from the macros for The TeXbook
%
%

\newcount\charno
\font\tentex=cmtex10
\font\amssy=msym10
\font\bigtenex=cmex10 scaled\magstep1
\font\bigfiv=cmr5 scaled\magstep5
\postdisplaypenalty=0
\def\oct#1{\hbox{\rm\'{}\kern-.2em\it#1\/\kern.05em}} % octal constant
\def\hex#1{\hbox{\rm\H{}\tt#1}} % hexadecimal constant

% macros for font tables
\def\oddline#1{\cr
  \noalign{\nointerlineskip}
  \multispan{19}\hrulefill&
  \setbox0=\hbox{\lower 2.3pt\hbox{\hex{#1x}}}\smash{\box0}\cr
  \noalign{\nointerlineskip}}
\def\evenline{\cr\noalign{\hrule}}
\def\chartstrut{\lower4.5pt\vbox to14pt{}}
\def\beginchart#1{$$ \global\charno=0 #1
  \halign to\hsize\bgroup
    \chartstrut##\tabskip0pt plus10pt&
    &\hfil##\hfil&\vrule##\cr
    \lower6.5pt\null
    &&&\oct0&&\oct1&&\oct2&&\oct3&&\oct4&&\oct5&&\oct6&&\oct7&\evenline}
\def\endchart{\raise11.5pt\null&&&\hex 8&&\hex 9&&\hex A&&\hex B&
  &\hex C&&\hex D&&\hex E&&\hex F&\cr\egroup$$}
\def\:{\setbox0=\hbox{\char\charno}%
  \ifdim\ht0>7.5pt\reposition
  \else\ifdim\dp0>2.5pt\reposition\fi\fi
  \box0\global\advance\charno by1 }
\def\reposition{\setbox0=\hbox{$\vcenter{\kern2pt\box0\kern2pt}$}}
\def\normalchart{%
  &\oct{00x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline0
  &\oct{01x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{02x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline1
  &\oct{03x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{04x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline2
  &\oct{05x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{06x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline3
  &\oct{07x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{10x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline4
  &\oct{11x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{12x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline5
  &\oct{13x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{14x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline6
  &\oct{15x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
  &\oct{16x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline7
  &\oct{17x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline}



\medskip\vfill
\noindent {\bf Figure 1.\enspace}
\rm
Here is a chart that shows ASCII codes in such a way that octal and
hexadecimal equivalents can easily be read off:
\beginchart{\global\charno='41\tentt
  \def\chartstrut{\lower4.3pt\vbox to13.6pt{}}}
&\oct{00x}&&NUL&&SOH&&STX&&ETX&&EOT&&ENQ&&ACK&&BEL&&\oddline0
&\oct{01x}&&BS&&HT&&LF&&VT&&FF&&CR&&SO&&SI&\evenline
&\oct{02x}&&DLE&&DC1&&DC2&&DC3&&DC4&&NAK&&SYN&&ETB&&\oddline1
&\oct{03x}&&CAN&&EM&&SUB&&ESC&&FS&&GS&&RS&&US&\evenline
&\oct{04x}&&SP&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline2
&\oct{05x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{06x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline3
&\oct{07x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{10x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline4
&\oct{11x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{12x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline5
&\oct{13x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{14x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline6
&\oct{15x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{16x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline7
&\oct{17x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&DEL&\evenline
\endchart
\vfill


\medskip\vfill
\noindent {\bf Figure 2.\enspace}
this chart shows how to address ASCII controls using the up-arrow:
\beginchart{\def\?{\char`^\char`^\:}\global\charno='100 \tentt}
&\oct{00x}&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\oddline0
&\oct{01x}&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\?&\evenline
&\oct{02x}&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\oddline1
&\oct{03x}&&\?&&\?&&\?&&\?&&\?&&\?&&\?&&\?&\evenline
&\global\charno='40
\oct{04x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline2
&\oct{05x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{06x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline3
&\oct{07x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{10x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline4
&\oct{11x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{12x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline5
&\oct{13x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{14x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline6
&\oct{15x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&\evenline
&\oct{16x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\oddline7
&\oct{17x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\char`^\char`^?&\evenline
\endchart
\vfill

\noindent {\bf Figure 3.\enspace}The
extended character codes for luxury keyboards:
\beginchart\tentex
\normalchart
\endchart
\vfill




\medskip\vfill
\noindent {\bf Figure 4.\enspace}Text roman font layout,
showing |cmr10|
\beginchart\tenrm
\normalchart
\endchart
\vfill


\medskip\vfill
\noindent {\bf Figure 5.\enspace}Text roman font layout, without F-Ligatures
showing |cmr5|
\beginchart\fiverm
\normalchart
\endchart
\vfill



\medskip\vfill
\noindent {\bf Figure 6.\enspace}Text roman font layout, without F-Ligatures
showing |cmr5| magnified so I can read it
\beginchart\bigfiv
\normalchart
\endchart
\vfill


\medskip\vfill
\noindent {\bf Figure 7.\enspace}Text italic font layout,
showing |cmti10|
\beginchart\tenit
\normalchart
\endchart
\vfill

\medskip\vfill
\noindent {\bf Figure 8.\enspace} Math italic font layout,
showing |cmmi10|
\beginchart\teni
\normalchart
\endchart
\vfill


\medskip\vfill
\noindent {\bf Figure 9.\enspace}Typewriter text font layout,
showing |cmtt10|
\beginchart\tentt
\normalchart
\endchart
\vfill


\medskip\vfil
\noindent {\bf Figure 10.\enspace}Math symbol font layout,
showing |cmsy10|
\beginchart\tensy
\normalchart
\endchart
\vfill
\medskip\vfil

\noindent {\bf Figure 10.\enspace}AMS symbol font layout,
showing |msym10|
\beginchart\amssy
\normalchart
\endchart
\vfill

\medskip\vfil
\noindent {\bf Figure 11.\enspace} {Math extension font} layout,
showing |cmex10|
\beginchart\tenex
\normalchart
\endchart
\vfill

\medskip\vfil
\noindent {\bf Figure 11.\enspace} {Math extension font} layout,
showing |cmex10| scaled up
\beginchart\bigtenex
\normalchart
\endchart
\vfill

\bye