2-29
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
The following table shows the assignment of memory addresses.
Address
Description
from
to
Size
Basic function
Additional functions
0000 0000
0007 FFFF
512k
Conventional system memory
0008 0000
0009 FBFF
127k
Conventional system memory
extended
via Setup ISA Memory
0009 FC00
0009 FFFF
1k
Conventional system memory
extended BIOS data
via Setup ISA Memory
000A 0000
000A FFFF
64k
VGA graphics refresh memory
shared SMM for Power
management
000B 0000
000B 7FFF
32k
Monochrome graphics/text refresh
memory
shared SMM for Power
management
000B 8000
000B FFFF
32k
VGA graphics/text refresh memory
shared SMM for Power
management
000C 0000
000C 7FFF
32k
VGA-BIOS expansion
000C 8000
000C BFFF
16k
ISA memory usually BIOS
expansion
via EMM High Dos Memory
000C C000
000C C7FF
2k
MPI when enabled (standard
setting)
via EMM High Dos Memory
000C C900
000C FFFF
14k
ISA memory usually BIOS
expansion
via EMM High Dos Memory
000D 0000
000D FFFF
64k
PCMCIA when enabled, usually
BIOS expansion
via EMM High Dos Memory
000E 0000
000E BFFF
48k
System BIOS
via EMM High Dos Memory
000E C000
000E CFFF
4k
System BIOS BootMessageLogo
via EMM High Dos Memory
000E D000
000E DFFF
4k
System BIOS ECSD
(plug & play configuration area)
via EMM High Dos Memory
000E E000
000E FFFF
8k
System BIOS Boot Block
via EMM High Dos Memory
000F 0000
000F FFFF
64k
System BIOS
via EMM High Dos Memory
0010 0000
00EF FFFF
14M
Extended system memory
00F0 0000
00FF FFFF
1M
Extended system memory
via Setup ISA Memory
0100 0000
07FF FFFF
112M
Extended system memory
0800 0000
FFF7 FFFF
4G-128M-
512k
PCI expansion
FFF8 0000
FFFD FFFF
512k-128k
ISA memory, dual port memory
application
FFFE 0000
FFFF FFFF
128k
System BIOS (mirrored from
000E 0000 to 000F FFFF)
Assignment of
Memory
Addresses
Motherboard