Here are instructions for generating LaTeX at a different site.
Unless otherwise specified, all files are on the <TEX82> directory at
SRI-AI.

You need the following files .TEX files:

     LPLAIN.TEX
     LATEX.TEX
     LFONTS.TEX

plus standard TeX files called by the PLAIN package, like HYPHEN.TEX.

You will have to modify LFONTS.TEX to have it load fonts available at
your site.  It should be obvious what you need to do.  If you want to
use the line and arrow picture-environment commands, you also have to
create two fonts of slanted lines: line10 and linew10.  The metafont
files for doing this are in LINE.MF, LINE10.MF and LINEW10.MF on
the <METAFONT> directory.

You create LaTeX just like you would an ordinary version of TeX,
except you must load LPLAIN instead of PLAIN.  (TeX sometimes
uses PLAIN as a default if nothing else is specified, and you may
have a version of TeX with PLAIN already loaded, which should
not be usd.)  For the TOPS20, the following sequence of commands
(showing prompts as well as what you type)

    @INITEX lplain
    *\dump
    @VIRTEX &lplain
    *^C
    @SAVE latex 0 37777

will produce a version that can be called by  @LATEX .  You'll
have to define TEXSPOOL: and other devices just like for TeX.

In addition to LaTeX itself, you'll need document style files
and page layout files.  The report and preprn styles, with
eleven and twelve options (for elevenpoint and twelvepoint) are
supported by the files

        REPORT.STY
        PREPRN.STY
        ELEVEN.STY
        TWELVE.STY

You'll have to create a page layout style file yourself, using
CANON.PLO as a model.  To create a page layout named foo, you need a
page layout style file named FOO.PLO.  The .STY and .PLO files
are called by LaTeX with \input commands, so they have to be put
into the appropriate directory.

Known bugs and planned changes are listed in LATEX.BUG and LATEX.DIF,
respectively.  They should be checked from time to time.  

LaTeX itself has proved to be reasonably free of bugs, and changes to
it are infrequent; you can request to be notified of them.  Numerous
minor bugs have appeared in the document styles, and the .STY files
are changed often, without warning.  You should check them regularly.
The .PLO files are simple, and I don't remember having discovered any
bugs in them.  They are twiddled occassionally to adjust parameters,
but you'll want to do that kind of adjustment yourself.

Good luck.