There is yet another level at which all machine instructions of the CSC-1 need to be described, which is down to the actual wires: what gets turned on and off, and when. These wires, such as the LD and MUX wires and the ALU and shifter control inputs, are often called control points because they are the places where the operation of the CPU is controlled.

Let us go through some of the mechanisms by which elements of RTL are implemented using the CSC-1 control points. First, whenever a register appears on the left side of the copies operator (<-) its LD wire is set high. Thus, A <- S implies that A-LD is 1.