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

Emulator Controls

• ctrl+h toggle debugger
• alt+h toggle zoom

Uxambly

Read more in the Uxambly Guide.

%RTN { JMP2r }

( devices )

|0100 ;Console { pad 8 char 1 byte 1 short 2 }
|0200 ^RESET JMP
|0204 ,ERROR JMP2
|0208 ,FRAME JMP2

( program )

@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

• Shortcut to export/import disk state
• Implement Uxambly REPL
• Load disks at a different place than 0x0000.

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/