Tal or Uxntal is a stack-based assembly language designed for the Uxn virtual machine. There are 256 instructions designed to work within a 16-bit addressing space. The Uxn specification provides Tal with two 256 bytes long circular stacks and 64kb of RAM. The language even features support for anonymous functions, and arity checking.

Sample Code

@fib ( num* -- numfib* )
	#0001 GTH2k ?{
		POP2 JMP2r }
	SUB2k fib STH2 INC2
	SUB2 fib STH2r
		ADD2
JMP2r

@paint-sprite ( x* y* -- )
	.Screen/y DEO2 ( set y position )
	.Screen/x DEO2 ( set x position )
	#16 .Screen/auto DEO ( set length 2 with auto y and addr )
	;23x-icns .Screen/addr DEO2 ( set addr )
	#01 .Screen/sprite DEOk DEOk DEO ( draw 3 rows of 1-bit sprites )
	JMP2r

@23x-icns
	( 0 ) ( 1 )
	( 0 ) 0010 2847 2810 0001 0000 00e0 2040 8000
	( 1 ) 0204 080f 0000 0001 0000 00e0 2040 8000

Uxn

Uxn is a small stack-based computer with an implementation-first design. It is specialized for building small, low-energy, audio-visual applications. The specification for Uxn fits onto a single page, and its implementation is 100 lines of C. Finally, it powers the personal computing stack called Varvara.