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Uxn

A stack-based VM, written in ANSI C.

Build

To build the Uxn emulator, you must have SDL2.

./build.sh 
	--debug # Add debug flags to compiler
	--cli # Run rom without graphics

Uxambly

Read more in the Uxambly Guide.

( 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 )
	
	$loop NOP
		( send ) DUP2 LDR =Console.char
		( incr ) #0001 ADD2
		( loop ) DUP2 LDR #00 NEQ ^$loop MUL JMP 
	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/