See the *.doc files for documentation:

* asm.doc: Documentation of assembler.

* emulator.doc: Documentation of the Uxn38 emulator, including of the
nonstandard features which it implements.

* uxn.doc: Documentation of the uxn instruction set.

* varvara.doc: Documentation of the standard devices and features of
Varvara. (Nonstandard features are documented in emulator.doc)

This project is available as both a fossil reopsitory and a git repository;
the fossil is the main one. (Note that pull requests from GitHub cannot be
merged, although you are free to make them, but I will just have to add
them manually instead if I accept the contribution (but I can list you as
a coauthor, if you wish).)

* Fossil:  http://zzo38computer.org/fossil/uxn.ui

* Git:  https://github.com/zzo38/uxn38