Setup and Operation 2-39
ISA Shared Memory Size
The ISA Shared Memory Size field is used to set a block of system memory which
will not be shadowed. (Shadowing is a technique which copies a block of memory
from an address in the expansion board’s ROM to the same address in the system
memory to allow faster access to the code and achieve higher performance.)
If “Disabled,” all upper memory is shadowed and ISA Shared Memory Base
Address field is not displayed. This field provides the following choices.
When a value other than “Disabled” is selected, a block is unshawdowed and the
ISA Shared Memory Base Address field will appear.
Disabled (default)
16 KB
32 KB
48 KB
64 KB
80 KB
96 KB
NOTE:
If a value of
“
96 KB
”
is selected, then
the ISA Shared Memory Base Address field can
only be set to C8000h; if
“
80 KB,
”
then a value
of C8000 or CC000h, etc.
ISA Shared Memory Base Address
The ISA Shared Memory Base Address field is only displayed when an ISA
Shared Memory Size has been selected. The choices are as follows.
C8000h (default)
CC000h
D0000h
D4000h
D8000h
DC000h
Available interrupt requests (IRQ) between IRQ3 through IRQ15 will be
displayed. Interrupts consumed by on-board resources will not be visible.
