Chez Scheme Version 5 is a high-performance implementation of Scheme
conforming to the IEEE/ANSI Scheme Standard and the R4RS.  Chez Scheme
provides an incremental optimizing compiler, complete run-time library,
generation-based garbage collector, interactive inspector, and C
interface.  New Version 5 features include improved performance,
lexical macros, multiple values, shared incremental heaps, guardians
and weak pairs, and generic ports.  Version 5 is available for Sparc
SunOS and Solaris, Alpha OSF/1, SGI IRIX 5.X, Motorola mc88000 SVR3/4,
80386 NeXT Mach, BSDI BSD/386, and Linux.  More information on Chez
Scheme can be obtained via anomymous ftp from 
   ftp.cs.indiana.edu:/pub/scheme/chezscheme/
Site license fees start at $9000 ($4500 academic).  We are not able to
handle personal sales at this time.  For detailed pricing and ordering
information contact sales@cadence.bloomington.in.us or Kent Dybvig at
dyb@cs.indiana.edu.  Cadence Research Systems, 3814 Devonshire South,
Bloomington, IN 47408-9698, USA.  Phone 812-333-9269, fax 812-332-4688.