https://wiki.xxiivv.com/site/uxn.html

XXIIVV

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  * uxntal
  * varvara

Uxn StickerUxn Sticker

Uxn is a virtual machine with 32 instructions.

[uxn]

This one-page computer is capable of hosting small applications,
programmable in a unique language. It was designed with an
implementation-first mindset with a focus on creating portable tools
and games.

This wiki and most of the audio-visual works documented on here were
created with Uxn-powered tools.

Memory

Uxn has no registers. It can tunnel through 127 subroutines and find
its way back. Up to 16 devices can interface with the CPU at once;
devices are peripherals such as screens, controllers, or even other
uxns. It has 64kb of observable memory, programs can move stacks into
addressable range to allow reading and writing directly into stack
memory.

+--------------------------------------+
|Memory|RAM          |Data   |64kb     |
|------+-------------+-------+---------|
|      |             |Data   |254 bytes|
|      |             |-------+---------|
|      |Working Stack|Error  |1 byte   |
|      |             |-------+---------|
|      |             |Pointer|1 byte   |
|Stacks|-------------+-------+---------|
|      |             |Data   |254 bytes|
|      |             |-------+---------|
|      |Return Stack |Error  |1 byte   |
|      |             |-------+---------|
|      |             |Pointer|1 byte   |
|------+-------------+-------+---------|
|  IO  |Devices      |Data   |256 bytes|
+--------------------------------------+

Design

Because Uxn was explicitly created to be hosted on pre-existing
hardware, the design was advised primarily by relative software
complexity; generating novel electronics is at odds with the project.
Features were weighted against the relative difficulty they would add
for programmers implementing their own emulators.

Stack-machines are ideal candidates for this scale of personal
computing. Not only do they limit the complexity of the assembler,
the resulting programs are quite succinct.

[fizzbuzz] -- fizzbuzz.rom, 99 bytes

With only 64kb of memory, it will never run Chrome, TensorFlow or a
blockchain. It sucks at doing most modern computing activities. It's
more about finding novel things could be made in such a small system.

While this project aspires to act as a target that may last, it is in
its infancy, the design could still change and break compatibility.

The VM can be implemented in about 100 lines of C, it lives at the
core of the Varvara computer. Uxn is to Varvara, what the 6502 is to
the Classic Nintendo.

Original illustrations created by Rekka Bellum.

[uxn64]

  * download emulator
  * visit forums
  * community projects
  * mailing list

Rostiger's Uxn ZineRostiger's Uxn ZineThe Sound Of Plumpkinsvarvara --
The Sound Of Plumpkins

  * 15B13 -- Uxn is born!

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