two types of motor driver configs:
1. Breakout board + 3 driver boards.
A breakout board is a board that connects to the computer by parallel port. it then buffers the signals and sends them to the individual driver boards that attach to the Controller Board (breakout board)
2. Hobby CNC, Mechatronics, and TB6560 chinese boards, and others, are "all-in-one" boards. They contain everything in one single board.