Lanner electronics EM-535 Series Manual page 49

AWARD BIOS SETUP
set the corresponding IRQ or DMA to " Legacy ISA"; otherwise you should set to PCI/ISA PnP.
PCI IRQ Activated By : Options are "Level" or "Edge". The default setting is "Level", this option is used
to select the IRQ's trigger method.
Used MEM base addr : Because BIOSes fail to auto detect some specific ISA Legacy cards with
requested memory space below 1M address, we have added the "Used MEM base addr" and "Used
MEM Length" to support such kind of cards. Now, with these two functions, users can define where
the used memory address is located and its length of the legacy area correspondingly. Based on this,
BIOS will skip the UMB area that is used by the legacy device to avoid the memory space conflict.
For example, if the user select "D000" for "Used MEM base addr" and "16K" for "Used MEM Length"
that means the address region D0000H-D3FFFH is occupied by ISA legacy cards, and BIOS will not
assign this region for PnP/ISA and PCI cards.
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