	11 of 30 - Our simple ALU - all operations in parallel    
	23 of 30 - Hello Computer
*****	https://katie.mtech.edu/classes/archive/f11/csci255/slides/255-lec5.pdf

***	https://inst.eecs.berkeley.edu/~cs61c/resources/blocks.pdf
	p4 of 8
	A common way to implement an ALU is to provide an instance of a 
	CL block for each of the possible ALU functions.

