Overview

Ypsilon is the implementation of Scheme Programming Language, which conforms to the latest standard R⁶RS. It achieves a remarkably short GC pause time and the best performance in parallel execution as it implements "mostly concurrent garbage collection", which is optimized for the multi-core CPU system.

Ypsilon is easy to use as well as good for applications of any kind that require quick, reliable, and interactive data processing. It implements full features of R⁶RS and R⁶RS standard libraries including: * arbitrary precision integer arithmetic * rational number * exact and inexact complex number * implicitly phased library * top-level program * proper tail recursion * call/cc and dynamic wind * unicode * bytevectors * records * exceptions and conditions * i/o * syntax-case * hashtables * enumerations

More libraries are included to support a wide variety of software development. Also it has built-in FFI which is easy to use. Please refer to the following files for FFI overview. * example/gtk-hello.scm * example/glut-demo.scm * sitelib/ypsilon/glut.scm * sitelib/ypsilon/gl.scm * sitelib/ypsilon/ffi.scm

News

2008-12-23 Ypsilon 0.9.6-update3 released. This version fixed all bugs found and supports Windows XP/Vista(32bit), MacOSX(32bit), Linux(32/64bit) , FreeBSD(32/64bit).

2008-09-03 Ypsilon 0.9.6-update2 released. This is a bug fix release.

2008-08-15 Ypsilon 0.9.6-update1 released. This is a bug fix release.

2008-08-01 Ypsilon 0.9.6 released. This version fixed all bugs found in version 0.9.5.

Links

• Known bugs in current release
• Changes in latest version (trunk)

• Ypsilon development roadmap

• Xcode3: How to checkout latest source code from repository

• Windows: How to install Ypsilon to 'C:\Users\<UserName>\Ypsilon'
• Using binfmt_misc linux kernel module

Other Resources

Ypsilon has been developed as a fundamental technology for LittleWing Pinball Construction System. * Ypsilon Wiki: http://www.littlewingpinball.net/mediawiki/index.php/Ypsilon * Ypsilon Background Story: http://www.littlewingpinball.com/contents/en/ypsilon.html * Draft documents (r6rs, socket, ffi, c-types): http://www.littlewing.co.jp/ypsilon/doc-draft/ * (Japanese) Ypsilon Background Story: http://www.littlewingpinball.com/contents/ja/ypsilon.html * (Japanese) Ypsilon Wiki: http://www.littlewingpinball.net/mediawiki-ja/index.php/Ypsilon * LittleWing Pinball Home: http://www.littlewingpinball.com/