Extended System Configuration Data

<operating system> (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.

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extended memory manager Extended Memory Specification Extended ML Extended Pascal Extended Self-containing Prolog	ESCD	Extended Tcl Extended Tiny Extended Video Graphics Array eXtended Video Graphics Array extensible