Manual

IEM-9452 ETX Module
Page 84
 DM Channel 1
 DM Channel 3
 DM Channel 5
 DM Channel 6
 DM Channel 7
 Reserved Memory Size [Disabled]
Use the Reserved Memory Size BIOS option to specify the amount of memory that
should be reserved for legacy ISA devices.

Disabled DEFAULT
No memory block reserved for legacy ISA devices

16K
16KB reserved for legacy ISA devices

32K
32KB reserved for legacy ISA devices

64K
54KB reserved for legacy ISA devices
6.5 Boot
Use the Boot menu (BIOS Menu 14) to configure system boot options.