The matheson ELS-6400 is an interface board PCB that has been used and is in working condition, originally sourced from Cymer with part numbers 06-05256-00A and 06-05204-01C.
It is also compatible with VersaLogic processors, specifically the VL-7709 and 05-05186-00. This board is essential for relay functions and is known to be used in Cymer's 06-05202-01C and 06-05203-01 models. Its reliability and interchangeability make it a valuable component for industrial applications requiring precise interface and relay operations.