In XEmacs 20.4 we had a file named  packages/tex-latin1.el. I can't
seem to find that in the 21.x core lisp or the SUMO. Is this
intentional or did we lose it?
From the header of tex-latin1.el: 
;; gm-lingo.el  
;; Translate to ISO from/to net/TeX conventions  ... 
;; Copyright 1993 Michael Gschwind (mike(a)vlsivie.tuwien.ac.at) 
 
;; Keywords: tex, iso, latin, 8bit 
 
;;  From: mike(a)vlsivie.tuwien.ac.at (Michael Gschwind) 
;;  Newsgroups: gnu.emacs.sources 
;;  Subject: tex sequence to ISO latin conversions (and back) 
;;  Date: 13 Oct 1993 12:12:35 GMT 
;;   
  Gunnar