\ProvidesPackage{alltex}
\def\@La{\protect\p@La}
\def\p@La{L%
           {\setbox0\hbox{T}%
            \setbox2\vbox to\ht0{\kern.07ex\hbox{%
               \csname S@\f@size\endcsname
                               \math@fontsfalse
                               \fontsize\sf@size\z@\selectfont
                               A}%
                         \vss}%
           \kern-.5\wd2
           \box2
          }}
\def\AllTeX{(\@La)\TeX}