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+# PreScheme
+
+## Overview
+
+PreScheme (also spelled Pre-Scheme) is a statically typed dialect of
+Scheme that gives the programmer the efficiency and low-level machine
+access of C while retaining many of the desirable features of Scheme.
+
+The PreScheme compiler makes use of type inference, partial evaluation
+and Scheme and Lisp compiler technology to compile the problematic
+features of Scheme, such as closures, into C code without significant
+run-time overhead. Use of such features in PreScheme programs is
+restricted to those cases that can be compiled into efficient code.
+
+Type reconstruction is done using a modified Hindley/Milner algorithm
+that allows overloaded user-defined functions.
+
+All top-level forms in PreScheme programs are evaluated at compile
+time, which gives the user additional control over the compiler's
+partial evaluation of a program.
+
+PreScheme has been implemented and used to write a byte-code
+interpeter and associated support code for a complete Scheme
+implementation.
+
+## Manuals
+
+* [The Nearly Complete Scheme48 PreScheme 1.3 Reference Manual](1.3/)
+
+## Implementations
+
+### Scheme 48
+
+### VLISP
+
+No known public release.
+
+### SPS
+
+SPS is a Pre-Scheme to (GNU) C compiler written in Pre-Scheme.
+
+Written in 1999.
+
+[GitHub](https://github.com/nineties-retro/sps)
+
+## Research papers
+
+From the MITRE Corporation:
+
+* A Verified Compiler for Pure PreScheme (1991)
+* The VLISP PreScheme Front End (1992)
+* A Verified Run-Time Structure for Pure PreScheme (1992)
+* The Revised VLISP PreScheme Front End (1993)
+* The VLISP Verified PreScheme Compiler (1995)
+* A Verified Compiler for Multithreaded PreScheme (1996)
+
+From Kelsey:
+
+* Pre-Scheme: A Scheme Dialect for Systems Programming (1997)