DS3800DMPC is a Microprocessor board developed by General Electric under the Mark IV series. The Mark IV included a triple modular redundant (TMR) design with fault-tolerant control, making it the first Speedtronic system to use a two-out-of-three voting mechanism for important controls and protective settings. The DS3800DMPC and other Mark IV boards can be found in the WOC catalog as tested, refurbished devices.