The Free On-line Dictionary of Computing (30 December 2018):

PC-Scheme

   Version 3.03

   compiler, debugger, profiler, editor, libraries

   (ftp://altdorf.ai.mit.edu/archive/pc-scheme/).

   Written at Texas Instruments.  Runs on MS-DOS 286/386 IBM
   PCs and compatibles.  Includes an optimising compiler, an
   emacs-like editor, inspector, debugger, performance testing,
   foreign function interface, window system and an
   object-oriented subsystem.  Also supports the dialect used in
   Hal Abelson and Gerald Sussman's SICP.

   Conformance: Revised^3 Report, also supports dialect used in
   SICP.

   restriction:	official version is $95, contact 

   ports:		MS-DOS

   See also PCS/Geneva.

   (1992-02-23)