Compaq 60002MC10 - Manual (Page 28)

BIOS
Page 4-7
D4000 - D7FFF Shadow:
D8000 - DBFFF Shadow:
DC000 - DFFFF Shadow:
These categories determine whether ROMs from option cards will be copied into
RAM. This will be in 16K byte or 32K byte units, and the size will depend on
chipset of the option card.
Enabled: Optional shadow is enabled.
Disabled: Optional shadow is disabled.