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R^3RS is also included with the documentation for TI's PC Scheme version 3.
I just upgraded to it. Also included as one of several sample files is
Kent Dybvig's extend-syntax, which is described in his book and included
as a standard feature in Chez Scheme v 2. extend-syntax is incredibly
powerful for defining special forms -- all one has to do is describe
Someone was looking for Scheme for a VAX. I highly recommend Chez Scheme
by Kent Dybvig (email@example.com, I think) distributed by Cadence
Associates (or something like that). Academic pricing for VMS, other
versions is very reasonable. Someone with accurate info should respond.
Someone else was looking for a Scheme compiler for a Tandy 1000. I should
think TI's PC Scheme would work. It is really excellent.
PC Scheme v 3.0 uses #T and #F instead of #!TRUE and #!FALSE, the same as
Chez Scheme. That is much cleaner.
Quasiquote expressions can be nested, and UNQUOTE, UNQUOTE-SPLICING key
words have been added.
Graphics now supports EGA 640 x 350 resolution. That is the improvement
I was looking for. New graphics functions are GET-PEN-COLOR, GET-PEN-
POSITION, POINT-COLOR, and SET-CLIPPING-RECTANGLE. EGA 640 x 200 is also
supported. Also, GRAPHICS-WINDOW for creating graphics windows is
described in the release notes, but undocumented.
Transcendental functions are computed using a new feature which allows
programs compiled from C or Turbo Pascal to be called from Scheme. An
8087 (80287) is used if present.
READ-LINE now echos to the screen when used to read from the console or
There are lots of other improvements. There is a one change from conforming
to nonconforming with the Report. The form (DEFINE ( ... ) ...) no
longer expands to a NAMED-LAMBDA. But this can still be forced by setting
PCS-INTEGRATE-DEFINE to ().
Roger Kirchner firstname.lastname@example.org