A LaTeX 2.09 package for the task; it has been re-implemented for current LaTeX in zed2e and ObjectZ.

Note that this package, as it stands, uses the MSX and MSY fonts, which are no longer available (though virtual fonts are available that map them to the more recent MSA and MSB fonts.

The author is Mike Spivey. The package is Copyright © 1988 J.M. Spivey.