# 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). ``` ( hello world ) %RTN { JMP2r } ( devices ) |0100 ;Console { pad 8 char 1 byte 1 short 2 } |01F0 .RESET .FRAME .ERROR ( vectors ) |01F8 [ 13fd 1ef3 1bf2 ] ( palette ) ( program ) |0200 @RESET ,text1 ,print-label JSR2 ,text2 ,print-label JSR2 #ab =Console.byte #cdef =Console.short BRK @print-label ( text ) $loop ( send ) DUP2 PEK2 =Console.char ( incr ) #0001 ADD2 ( loop ) DUP2 PEK2 #00 NEQ ^$loop JNZ POP2 RTN @text1 [ Welcome 20 to 20 UxnVM 0a00 ] @text2 [ Hello 20 World 0a00 ] @FRAME BRK @ERROR BRK ``` ## TODOs ### OS Boot Disk - Load external disk in disk2 ### Assembler - Includes - Defines - Jump helpers - Implement Peek/Pook to helpers - Create a theme designer application - DateTime device - Document controller.player2 ## Notes ## Palettes - `[ 6a03 4a0d aa0c ]`, purple/cyan - `[ a1f3 a14d a16c ]`, grey-pink/teal ## 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/