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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
% Module: ZzTeX Plain TeX Compatibility
%
% Synopsis: This module contains definitions necessary for
% compatibility with Plain TeX. The only goal is to
% allow ZzTeX to run on top of Plain TeX.
%
% Author: Paul C. Anagnostopoulos
% Created: 24 July 1991
%
% Copyright 1989--2020 by Paul C. Anagnostopoulos
% under The MIT License (opensource.org/licenses/MIT)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\if \definedp{\dospecials}
\let \znext = \relax
\else
\let \znext = \endinput
\fi
\znext
\def \zplainerror {%
\error{plaintex}{Cannot use this Plain TeX feature in ZzTeX}}
% Definitions
% -----------
\catcode`\@ = \catletter
\zremovePlaindef \p@
\definedimen{\p@}{1pt}
\zremovePlaindef \z@
\definedimen{\z@}{0pt}
\zremovePlaindef \z@skip
\defineskip{\z@skip}{0pt plus 0pt minus 0pt}
\catcode`\@ = \catactive
\let \beginsection = \zplainerror
\let \bye = \zplainerror
\let \eject = \zplainerror
\let \leavevmode = \ensurepar
\let \normalbottom = \zplainerror
\let \raggedright = \zplainerror
\let \supereject = \zplainerror
\let \ttraggedright = \zplainerror
% Eliminate Fonts
% --------- -----
\tcounta = 0
\loop
\zclearfam{\tcounta}%
\increment \tcounta
\if \lssp{\tcounta}{16}\repeat
\let \rm = \relax
\let \mit = \relax
\let \it = \relax
\let \sl = \undefined \let \slfam = \undefined
\let \bf = \relax
\let \tt = \relax
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