NOTE: The original LISPF4, written in FORTRAN IV (included herein as lispf4.orig), always worked flawlessly. I converted it to 32-bit C via the FORTRAN to C converter. I think it worked, but didn't use it a lot. I later made a few adjustments for 64 bits. At first, I thought it worked, but I now realize it does not. This is going to take some effort to debug. I just do not have the time right now. If someone were to, I might suggest starting back with the original known-working FORTRAN source.
LISPF4 is an InterLisp interpreter written by Mats Nordstrom from Uppsala, Sweden, in the early '80s. It was written in FORTRAN and found by me, over the course of a few years of use, to be quite stable. I subsequently used the F2C program to convert it to C. I then gave it the ability to have command-line determination of the memory size. I have much less experience with the C port in terms of reliability.
The original FORTRAN code required a small assembler piece to provide byte indexing into integers. This small piece caused no end of trouble when porting to a new compiler. Since C can do this without assembler, this problem has hopefully been eliminated.
The system supports much of the InterLisp standard, and a few bits of the standard were added by me. There is no GUI. Sometime in the late '90s Mats was kind enough to give me a copy of the latest version he had (8/22/83). He also gave me permission to release it so long as I retained his credits. Among other things, this distribution includes the entire, untouched, original source code and documentation.
The current status of the C conversion eliminates the need for a FORTRAN compiler or F2C. It is all C code now. I've had it working on Windows, Mac, and Linux.
Interlisp is a dynamically scoped Lisp system. It supports LAMBDA (evaluates function arguments), NLAMBDA (doesn't evaluate its arguments), and a variable number of arguments. Macros are supported as well.
The system comes with a pretty complete user manual and implementor's manual. I also include the documentation this system is based on.
Pre-built systems for Linux, Mac, and Windows are also included.
See the Documentation/README.txt file for more complete documentation.
Source code located at: https://github.com/blakemcbride/LISPF4
Enjoy.
Blake McBride