60.3 Format

<..equations of amstex.tex..>
                                       \catcode‘\#=13 \catcode‘\!=6
 \def\format:!1\\{\def\preamble@{!1}%
    \hashtoks@{#}%
    \def\l{$\m@th\the\hashtoks@$\hfil}%
    \def\c{\hfil$\m@th\the\hashtoks@$\hfil}%
    \def\r{\hfil$\m@th\the\hashtoks@$}%
    \SaveMkHalignConf:g{format}%
    \edef\preamble@@{\:span\preamble@}%
    <.expand amstex.tex ...alignat pattern.>\MkHalign#{\preamble@@}}
                                       \catcode‘\#=6 \catcode‘\!=12
 \def\:tempc{\crcr\EndMkHalign\RecallMkHalignConfig
    \iffalse{\fi\ifnum‘}=0 \fi\format:}
 \HLet\format=\:tempc
 \let\:format=\format
 \let\format=\o:format:
 \let\MkHformat=\empty
 \def\:tempc{\def\format{\global\let\format=\o:format: \:format}}
 \HLet\MkHformat=\:tempc
 \NewConfigure{format}{6}
 -_-_-