## PLT Release Notes

Current Release:`` 53
Release Date:`` July 25, 1998.

DrScheme v53 is primarily a bug-fix release. Many of the fixes are a result of the TeachScheme! 1998 Workshop held at Rice University. This note summarizes the major differences between this release and DrScheme v52.

## The Future

PLT intends to conduct a major release by the end of this year or early next year. The changes will directly affect users of MrEd, the graphical toolbox. Please expect deletions of features, additions, and a few modifications. DrScheme will migrate to a graphical multi-module environment. This change should not affect beginners or teachers.

## Changes

- DrScheme, MrEd, and MzScheme have significantly improved performance on PowerPC Macintoshes.

See the HISTORY files in notes/drscheme descriptions of other changes and bug fixes for DrScheme.

MzScheme and MrEd users should look at the HISTORY files in notes/mzscheme and notes/mred for detailed descriptions of changes and bug fixes for those applications.

## Web pages

Rice PLT is pleased to mention its Web collection of resources for Schemers at http://www.schemers.org/.

Submit bugs using the web interface (encouraged) or send mail to plt-bugs@cs.rice.edu (discouraged).