system> (EsCD) An area of memory, not exceeding 32 kilobytes in size, used by Ms-DOs(?) asNVRAM for {PNP BIOs} and {PNP Os}. It must be writeable at {run time}. Intel' sICU also uses EsCD to store information for PNP IsA cards and legacy IsA cards. (1999-11-22)