uxn/README.md

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# Uxn
A [stack-based VM](https://wiki.xxiivv.com/site/uxn.html), written in ANSI C.
## Build
To build the Uxn emulator, you must have [SDL2](https://wiki.libsdl.org/).
```sh
./build.sh
--debug # Add debug flags to compiler
--cli # Run rom without graphics
```
## 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 )
|0110 @Console [ &pad $8 &char $1 ]
( program )
|0200
;hello-word ;print JSR2
BRK
@print ( addr -- )
&loop
( send ) DUP2 PEK2 .Console/char IOW
( incr ) #0001 ADD2
( loop ) DUP2 PEK2 #00 NEQ ,&loop JNZ
POP2
RTN
@hello-word [ 48 65 6c 6c 6f 20 57 6f 72 6c 64 21 ]
```
## TODOs
- Shortcut to export/import disk state
- Implement Uxambly REPL
- Load disks at a different place than 0x0000.
- Curl device? 8-bit web browser?
## Palettes
- `#6a03` `#4a0d` `#aa0c`, purple/cyan
- `#a1f3` `#a14d` `#a16c`, grey-pink/teal
- `#8c4b` `#884b` `#e8bb`, commodore64
## 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/