Resurrected from a tar ball in 2018. Original README below. I suppose this proves that software never dies...

PSD - THE PORTABLE SCHEME DEBUGGER VERSION 1.3, 1993

This is psd, the portable Scheme debugger. It does source code debugging for any R4RS compliant Scheme interpreter when run in a GNU Emacs buffer (either version 18 or 19). With psd you can

• set and clear breakpoints
• single step evaluation
• examine and change the variables of the debugged program
• follow execution in an editor window
• run a program until a run time error occurs, and examine the state of the program

You can find the latest version of psd in cs.tut.fi:/pub/src/languages/schemes. It is also available in the Scheme repository at nexus.yorku.ca and its mirror sites, at least ftp.inria.fr and faui80.informatik.uni-erlangen.de.

TO INSTALL AND RUN: see the manual in doc/

Psd is known to work with Aubrey Jaffer's scm, but porting to other Schemes should be easy. In fact, for a R4RS Scheme you should not have "port" it at all. It works also with Elk v. 1.5 and the sci interpreter in the Scheme->C system.

Files in the distribution:

• README this file

• doc/article.tex a technical description of psd

• doc/article.bbl LaTeX bibliography

• doc/article.ps PostScript file derived from article.tex

• doc/manual.tex a user's manual

• doc/manual.bbl bibliograpy

• doc/manual.ps user's manual in PostScript

• doc/quick-intro. tex quick reference for psd

• doc/quick-intro.ps

• psd.el psd minor mode for Emacs

• psd.scm the generic main file that takes care of loading psd

• psd-slib.scm main file to be used with slib

• psd-scm.scm ditto for scm without slib (you should really get slib)

• psd-sci.scm ditto for sci (tested with version 28sep90jfb)

• instrum.scm the instrumentation code

• pexpr.scm definition of pexps, which are sexps with position information

• read.scm the reader for psd

• runtime.scm runtime support for debugging

• primitives.scm runtime support that has to know about primitive procedures

• version.scm announces the psd version

• qp.scm print any Scheme object in one line, truncating if necessary. Normally this comes from slib.

• cmuscheme.el the CMU Scheme mode for GNU Emacs by Olin Shivers.

• comint.el support for cmuscheme.el

Comments, suggestions and bug reports are welcome.

Cheers, Pertti