Stanford Lecture: The Internal Details of TeX82 - Session 10 (July 30, 1982)

[AUDIO OUT]

It's the section of the TeX82 listing is part 20. Starting in section 456, page 158 on your copies.

The important thing to understand here is what kind of files TeX uses in order

to get all the information it needs about fonts. And these are called TFM files, TeX font metric files.

And they are used not only by TeX but by other system programs, and the design was intended