IS420UCSBH1A is the controller of general electric Mark VIe system. MKVIe is one of the most advanced Speedtronic systems designed by GE to control water turbine, gas turbine and steam turbine systems. IS420UCSBH1A is one of the five available UCSB modules. IS420UCSBH1A is a single-module controller, which uses its onboard I/O network to interface with I/O groups. The old controller in the previous Speedtronic system realized the same interface through the backplane connector. The device is an air-cooled device. It doesn’t have an onboard fan or battery, but it has a built-in power supply. The unit is small, covering an area of 6.4 inches x 8.1 inches x 1.4 inches. Other specifications include: 600 MHz Intel EP80579 microprocessor 256 MB DDR2 SDRAM memory, SRAMQNX Neutrino OS with flash memory support, control block language (analog and digital), twisted-pair 10Base-TX/100Base-TX and RJ-45 connectors. TCP/IP protocol for many applications is 2.4 pounds, excluding transportation and packaging environment. Operating temperature is -22 to 149 degrees Fahrenheit.