# 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 ) |10 @Console [ &pad $8 &char $1 ] ( init ) |0100 ( -> ) ;hello-word ;print JSR2 BRK @print ( addr* -- ) &loop ( send ) DUP2 GET .Console/char DEO ( incr ) #0001 ADD2 ( loop ) DUP2 GET #00 NEQ ,&loop JNZ POP2 RTN @hello-word "hello 20 "World! ``` ## TODOs - Shortcut to export/import disk state - Implement Uxambly REPL - Load disks at a different place than 0x0000. - Curl device? 8-bit web browser? - Replace LTS/GTS? `LTS = #80 ADD SWP #80 ADD SWP LTH` - `#80 ADD SWP #80 ADD GTH` ## 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/