Extended System Configuration Data
ESCD or Extended System Configuration Data is a part of
nonvolatile BIOS memory(aka CMOS memory) on the motherboardof a personal computer, where information about ISA PnP devices is stored. It's used by the BIOSto allocate resources for devices like expansion cards.
The BIOS also updates the ESCD each time the hardware configuration changes, after deciding how to re-allocate resources like IRQ and memory mapping ranges. After the ESCD has been updated, the decision need not be made again, which thereafter results in faster startup without conflicts until the next hardware configuration change.
An ISA Configuration Utility (ICU) can be used to update the ESCD via PnP BIOS interfaces. The
Microsoft Windows operating system Device Manageris an instance of such a utility (and more).
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