Projects

Pre-Scheme Restoration

The Pre-Scheme Restoration project, porting the Pre-Scheme compiler from Scheme 48 to R7RS Schemes (work in progress!).

• https://codeberg.org/prescheme/prescheme

Pre-Scheme Demo

A collection of tiny demo programs written in Pre-Scheme, with a simple Makefile build system using the stand-alone scheme48-prescheme package available in Guix.

• https://codeberg.org/prescheme/prescheme-demo

Scheme 48

The original Pre-Scheme project, with a bytecode virtual machine, two-space garbage collector, and BIBOP garbage collector, all implemented in Pre-Scheme. The VM and GC code can be found in the scheme/vm directory, and the Pre-Scheme compiler itself can be found in the ps-compiler directory.

• https://www.s48.org/
• https://www.s48.org/cgi-bin/hgwebdir.cgi/s48
• https://codeberg.org/prescheme/scheme48

3L Project

3L is an experimental minimalistic operating system, consisting of a Lisp core image implemented in Pre-Scheme, which boots natively in an x86-64 virtual machine.

• https://3lproject.org/
• https://code.thintz.com/tjhintz/3l