The latest kernel is S32.03. The S prefix indicates that the kernel is conformant
to the standards laid down in The Book of Shen, 4th edition .
The downloads include versions built with extensions which are documented by the developer.
Unless stated, all versions should support the features documented in The Book of Shen . We are
happy to point to new downloads posted in the newsgroup but we do insist on standards of reliability
in these ports. There is a folder of test programs in the sources for people to test their ports.
Any Shen implementation should pass these tests modulo any memory limitations of the platform.
The source code and installation instructions for the kernel can be downloaded from here.
S34.3 || Released 27/03/2023. fixed bug in destroy function.
S34.2 || Released 07/12/2022. polymorphic types for YACC.
S34.1 || Released 27/11/2022. correctness bug resolved in type checker.
S34 || Released 09/09/2022. assert and retract introduced into Shen Prolog;
name clash problem resolved in compiler.
S33.01 || Released 09/09/2022. ! and % debugged to ignore whitespace junk.
'foreign' introduced to make native code connection easier.
S32.03 || Released 30/07/2022. backend corrected so integer? test works; sequent compiler
debugged for false mode declarations. |
S32.03 || 32.03 for BSD. |
S32.02 || Released 20/07/2022. Bug in lambda expressions in Horn clauses fixed. |
S32.01 || Released 15/05/2022. Bug in overapplications fixed. |
S32 || Released 11/02/2022. Bug in 'synonyms' fixed. Left linear issue in types resolved. |
S31.03 || Released 13/12/2021. Attempting to redefine system functions cannot screw up types and arity. |
S31.02 || Released 15/11/2021. Backend functions
for Common Lisp placed in package .cl rather than .shen. |
S31.01 || Released 1/11/2021. This is the vanilla
version from Mark Tarver documented in The Book of Shen. |
These are various ports which are based on the S series kernels. The 'Shen with batteries included'
ports have the Standard Library built in.
| Platform || Operating System || Comments |
SBCL || Windows
|| Ported by Mark Tarver, S34.2, based on standard installation SBCL 2.0.0. Includes Standard Library. |
CLisp || Windows
|| Ported by Mark Tarver, S34.2, based on standard installation CLisp, 2.49. Includes Standard Library. |
Scheme || Various || Ported by Bruno Deferrari. |
There are a large number of pre-S series ports which can be found
The Standard Library
The most important is the standard library written by Mark Tarver, developed from
the closed source Shen Professional. This is documented in the 'Learn' section of
The Logic Lab
This is detailed in the Shen education channel and is available in Spring 2023
Theorem prover based on HORN clause logic described here.
There have been several editors developed for Shen. Downloads exist for Emacs and Robert
Koeniger developed a version for Sublime.
Eric Schulte developed a
regex parser in
the manner of Perl for parsing large files.
Foreign Function Interface
Mark Tarver developed a
file-based FFI designed to work with the Shen instruction set
A compendium of other work, some historically early, is held here..
Shen Education Channel starts on Youtube.
Faster, smaller S31 Shen kernel released; read about the S series of kernels here.
Fourth edition of 'The Book of Shen' released; read about it here.
Bruno Deferrari wins the first Shen Open Science prize.
Yggdrasil project launched - the grand unification of programming languages.
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