Portable Scheme Debugger (PSD) A package for source code debugging of {R4RS}-compliant {Scheme} under {GNU Emacs} by Kellom ?ki Pertti <[email protected]>. Version 1.1. Distributed under {GNU} {GPL}. It works with {scm}, {Elk} and {Scheme->C}. (ftp://ftp.cs.tut.fi/pub/src/languages/schemes/psd.tar.Z). (1992-10-08)