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- This is the VSL Lisp system. Its key attribute is that it is SMALL.
- The source file (vsl.c) is around 3000 lines long, but despite that
- the system can build and run much of Reduce. Since there is only
- an interpreter it will be slow, but for teaching purposes and for
- fun it may still be of interest.
- There are two versions here (apologies).
- vsl1.c can be compiled and is expected to run Reduce. Try "make reduce" here
- and then "./vsl1 -i reduce.img" possibly followed by a file-name to read.
- This is all interpreted and the bignum arithmetic is painfully slow, but all
- it needs is a simple C compiler so it may be of interest as at leaset a first
- test on a new and potentially tricky machine. But note that a Reduce built
- that was is not only slow but it has not been seriously tested and either
- bugs in vsl1 or missing features may cause problems to arise. Because vsl1.c
- is so compact you are mostly expected to track those down and fix them for
- yourself!
- The second version is called simply vsl.c. That was being used as part of a
- project to explore the bootstrapping phases of building PSL. It thus has
- options to mimic the parsing regime in a raw "bpsl" Lisp (with eg "-" and "&"
- treated as letters so that one can have a token &abc-def without needing
- to use escape characters to spell it). There are some somewhat fragmentary
- files and stages in the Makefile for starting to build a PSL kernel. The work
- there got as far as "proof of concept" and so is available if anybody wants
- to pick it up, but it is not complete or tidy! If you want to port PSL as a
- serious task you will be better off using an existing version and running
- initial bootstrap stages as cross-builds on a platform where everthing is
- known to be stable.
- Arthur Norman. 2012-2018, 2021
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