Hardware Information
7-8
SIMATIC Box PC 620 Manual
A5E00131465-03
Memory addresses assignment
Address
Size
Description
basic function
possible alternative
function
from
to
basic function
function
0000 0000
0007 FFFF
512K
Conventional system memory
0008 0000
0009 8FFF
123k
Conventional system memory
extended
0009 9C00
0009 FFFF
5K
XBDA, extended Bios Data Area
000A 0000
000A FFFF
64K
VGA graphics refresh memory
shared SMM for power
management
000B 0000
000B 7FFF
32K
SW grahics/text refresh memory
000B 8000
000B FFFF
32K
VGA graphics/text refresh
memory
000C 0000
000C BFFF
48K
VGA BIOS expansion
000C C000
000C CFFF
4K
PXE
allways occupied
000C D000
000C DFFF
4K
Optional PXE part,
can be disabled in
SETUP, via EMM High
DOS Memory
000C D000
000C FFFF
12K
unused (devices driver or ISA
hardware)
via EMM High DOS
Memory
000D 0000
000D 7FFF
32K
unused (devices driver or ISA
hardware)
via EMM High DOS
Memory
000D 8000
000D FFFF
32K
unused (devices or ISA
hardware)
via EMM High DOS
Memory
000E 0000
000E 3FFF
16K
Legacy USB BIOS extension ,
not usable for ISA cards!
via EMM High DOS
Memory
000E 6000
000F FFFF
112K
System BIOS
0010 0000
00EF FFFF
14M
System memory
00F0 0000
00FF FFFF
16M–15M=
1M
System memory or Memory Hole
via Setup ISA-Memory
(Memory-Hole)
0100 0000
1FFF FFFF
Max.
512MB –
16MB
System memory, 512 Kbytes of
top of memory are reserved for
USB.
Abhängig vom
Speicherausbau
2000 0000
FFF7 FFFF
PCI Memory address area
For PCI expansion cards
FFF8 0000
FFFF FFFF
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