nuclear@0: ALU opcodes
nuclear@0: -----------
nuclear@0: 0	(0000)	move
nuclear@0: 1	(0001)	?
nuclear@0: 2	(0010)	add
nuclear@0: 3	(0011)	subtract
nuclear@0: 4	(0100)	and
nuclear@0: 5	(0101)	or
nuclear@0: 6	(0110)	xor
nuclear@0: 7	(0111)	not
nuclear@0: 8	(1000)	shl/sal
nuclear@0: 9	(1001)	shr
nuclear@0: 10	(1010)	sar