GE IS420UCSBH4A UCSB Controller ModuleDescription The GE IS420UCSBH4A is a high performance UCSB controller module from the Mark VIe control system series. Designed for gas and steam turbine applications, it executes real time control logic, manages I O communications, and supports critical automation functions with speed and reliability. Specifications Model Number: IS420UCSBH4A Processor: Intel EP80579 @ 1066 MHz Memory: 256 MB DDR2 SDRAM Operating System: QNX Neutrino real time OS