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Other operating systems (OS/2, Windows NT) allow you to address the full memory area
directly.
Upper
Memory
C0000h –
C8000h
C8000h –
DFFFFh
E0000h –
EFFFFh
F0000h –
FFFFFh
System Resource Allocations
Use
Available
Yes
Yes
SSD Flash
No
pages and
tables
System
No
BIOS
46
Comment
Free for ISA bus or shadow RAM in standard
configuration, mainly used by ISA VGA cards.
Free for ISA bus or shadow RAM in standard
configuration.
If onboard SSD is enabled, the matrix
keyboard or JRC is used; a 32K block is
shadowed for BIOS extensions, starting with
first free area at D8000h or D0000h or C8000h
or C0000h. (BIOS extensions do not use the
whole shadow block.)
If the onboard SSD is disabled in setup, the
area is free for other devices to use (ISA bus
only, no shadow RAM).
MOPS/386A User's Guide
Kontron
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