Apr 1995
v 2.4
Support for OS/2, both FAT and HPFS.
Included sample Rexx script (for OS/2 + emTeX + scm)
that has robust TEXINPUT recognition.
Fixed paragraph indentation bug after {schemedisplay}
within {schemeregion}.
Recognizes LaTeX2e files in addition to LaTeX2.09.
Sentence-ending space doesn't follow null?, set!, etc.
Documentation converted to plain TeX.
Added {schemeresponse}, {schemeresponsebox}, and their
corresponding \defscheme*token and \undefscheme*token.
Fixed bug related to quoted special symbols;
quoted math escapes; and quoted strings.

Jan 1994
v 2.3

The Dark Years
Several bug fixes

Dec 1991
First major update
  
Mar 1991
First public release

1990
First Rice PLT release