b4

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#+title: The b4 virtual machine

• About

b4 is a tiny virtual machine, with a forth-like flavor.

There are currently five implementations:

• [[./jlang/]], implemented in [[https://code.jsoftware.com/wiki/Main_Page][J]].
• [[./pas/]], implemented in [[https://www.freepascal.org/][free pascal]].
• [[./lil/]], implemented in [[https://beyondloom.com/decker/lil.html][lil]].
• [[./js/]], implemented in javascript.
• [[https://github.com/tangentstorm/b4-gd][b4-gd]], implemented in GDScript for [[https://docs.godotengine.org/en/stable/][Godot 4]].

The implementations are kept in sync through the tests in [[./b4-tests.org]]

See [[./bios/bios.b4a.org]] for an example of b4 assembly language.

• Links

• [[https://github.com/tangentstorm/b4][b4 github repo]]
• twitter: [[https://twitter.com/tangentstorm][@tangentstorm]] / [[https://twitter.com/#!/search/realtime/%23b4lang][#b4lang]]
• reddit: [[http://reddit.com/r/b4lang][/r/b4lang]]

• Background

B4 is a forth-like language. Quick intros to forth (free and online):

• [[http://www.colorforth.com/POL.htm][Programming a Problem-Oriented Language]]
• [[http://www.forth.com/starting-forth/][Starting Forth]]

B4 was strongly influenced by the [[http://retroforth.org/docs/The_Ngaro_Virtual_Machine.html][ngaro virtual machine]] from retroforth 11, as well as the [[https://www.greenarraychips.com/home/documents/index.php#architecture][forth chips from greenarrays]].