Comprising single-axis PCL6114 and 4-axis PCL6144 servo/stepper controller chips, PCL61x4 Series features SPI serial bus for 4-wire connection to augment existing 8-/16-bit parallel bus. Programmable software limits and 27 event factors are provided to initiate interrupt signal output. Along with built-in pre-registers for continuous operation, features include linear interpolation, 9 major operating modes, and input terminals for manual pulsers, jog switches, and limit/homing switches.