GE IS420UCSBH4A | Mark VIe Controller.The GE IS420UCSBH4A is a high-speed controller module produced by General Electric. It is part of the Mark VIe Series control system and is designed for use in applications that require high reliability and high speeds.Controller IS420UCSBH4A was designed by General Electric for the Mark VIe series to be used in high-speed applications, with a 1066 MHz EP80579 Intel Processor. This controller can be used in EX2100e and LS2100e applications along with the Mark VIe series.