# Uxn
An [8-bit stack-based computer](https://wiki.xxiivv.com/site/uxn.html), written in ANSI C.
## Build
### Linux
To build the Uxn emulator on Linux, you must have [SDL2](https://wiki.libsdl.org/).
```sh
./build.sh
--debug # Add debug flags to compiler
--cli # Run rom without graphics
```
### Plan 9
To build the Uxn emulator on [9front](http://9front.org/), via [npe](https://git.sr.ht/~ft/npe):
```rc
mk
```
If the build fails on 9front because of missing headers or functions,
try again after `rm -r /sys/include/npe`.
## Getting Started
Begin by building the assembler and emulator by running the build script.
```
./build.sh
```
You now have the assembler(`uxnasm`) and the emulator(`uxnemu`). To create a rom, from a [usm file](https://wiki.xxiivv.com/site/uxambly.html), use the following command. This example will create the `life.rom` from the `life.usm` uxambly file, point to a different file or folder to assemble a different rom. You can find additional roms [here](https://sr.ht/~rabbits/uxn/sources).
```
bin/uxnasm projects/demos/life.usm bin/life.rom
```
To launch the rom:
```
bin/uxnemu bin/life.rom
```
## Emulator Controls
- `ctrl+h` toggle debugger
- `alt+h` toggle zoom
## Uxambly
Read more in the [Uxambly Guide](https://wiki.xxiivv.com/site/uxambly.html).
```
( dev/console )
%RTN { JMP2r }
( devices )
|10 @Console [ &pad $8 &char $1 ]
( init )
|0100 ( -> )
,hello-word
&loop
( send ) LDRk .Console/char DEO
( incr ) #01 ADD
( loop ) DUP ,&loop JCN
POP
BRK
@hello-word "hello 20 "World!
```
## TODOs
- Shortcut to export/import disk state
## Palettes
- `#6a03` `#4a0d` `#aa0c`, purple/cyan
- `#a1f3` `#a14d` `#a16c`, grey-pink/teal
- `#8c4b` `#884b` `#e8bb`, commodore64
## Convert audio for Unx
```sox sub202_C.wav -b 8 -c 1 -e signed output.raw```
## Refs
https://code.9front.org/hg/plan9front/file/a7f9946e238f/sys/src/games/nes/cpu.c
http://www.w3group.de/stable_glossar.html
http://www.emulator101.com/6502-addressing-modes.html
http://forth.works/8f0c04f616b6c34496eb2141785b4454
https://justinmeiners.github.io/lc3-vm/