(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)