Aaeon SBC-456 User Manual page 61

Reserved Memory Size
This option specifies the size of the memory area reserved for
legacy ISA adapter cards.
The settings are Disabled, 16K, 32K, and 64K. The default
settings are Disabled.
Reserved Memory Address
This option specifies the beginning address (in hex) of the reserved
memory area. The specified ROM memory area is reserved for use
by legacy ISA adapter cards.
The settings are C0000, C4000, C8000, CC000, D0000, D4000,
D8000, or DC000.
Chapter 3 AMIBIOS setup 53