(ESCD) An area of memory, not exceeding 32 kilobytes in size, USed by MS-DOS(?) as NVRAM for {PNP BIOS} and {PNP OS}. It mUSt be writeable at {run time}. Intel' s ICU also USes ESCD to store information for PNP ISA cards and legacy ISA cards. (1999-11-22)