Copying the introduction text: @* \[1] Introduction. This is \TeX, a document compiler intended to produce typesetting of high quality. The \PASCAL\ program th

Copying the introduction text: @* \[1] Introduction. This is \TeX, a document compiler intended to produce typesetting of high quality. The \PASCAL\ program that follows is the definition of \TeX82, a standard @:PASCAL}{\PASCAL@> @!@:TeX82}{\TeX82@> version of \TeX\ that is designed to be highly portable so that identical output will be obtainable on a great variety of computers. The main purpose of the following program is to explain the algorithms of \TeX\ as clearly as possible. As a result, the program will not necessarily be very efficient when a particular \PASCAL\ compiler has translated it into a particular machine language. However, the program has been written so that it can be tuned to run efficiently in a wide variety of operating environments by making comparatively few changes. Such flexibility is possible because the documentation that follows is written in the \.{WEB} language, which is at a higher level than \PASCAL; the preprocessing step that converts \.{WEB} to \PASCAL\ is able to introduce most of the necessary refinements. Semi-automatic translation to other languages is also feasible, because the program below does not make extensive use of features that are peculiar to \PASCAL.