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README.md

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.

( 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/