7
7-2
Programming Device PG 740
C79000-G7076-C742-01
7.1 Hardware Address Table
There are two kinds of address area:
S Memory address area
S I/O address area.
Different read/write signals (I/O WR, I/O RD, MEMR, MEMR) are used to
reference these areas. The following tables will give you an overview of the
address areas used. Please refer to the descriptions of the individual
functional groups for more details.
Table 7-1 Assignment of the Memory-Addresses
From
Address
To
Address
Size
ÁÁÁÁÁÁÁÁ
Basic Function Described
ÁÁÁÁÁÁÁÁ
Possible Alternative Function
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
ÁÁÁÁÁÁÁÁ
Conventional system memory
extended BIOS data
ÁÁÁÁÁÁÁÁ
Via Setup ISA memory
000A 0000 000A FFFF 64k
ÁÁÁÁÁÁÁÁ
VGA graphics refresh memory
ÁÁÁÁÁÁÁÁ
Shared SMM for power
management
000B 0000 000B 7FFF 32k
B/W graphics/text refresh memory
Shared SMM for power
management
000B 8000 000B FFFF 32k
ÁÁÁÁÁÁÁÁ
VGA graphics/text refresh memory
ÁÁÁÁÁÁÁÁ
Shared SMM for power
management
000C 0000 000C BFFF 48k
VGA BIOS expansion
000C C000 000C C7FF 2k
MPI if enabled
Via EMM high DOS memory
000C C800 000C FFFF 12k
ISA memory normally BIOS
expansion
Via EMM high DOS memory
000D 0000 000D FFFF 64k
ÁÁÁÁÁÁÁÁ
PCMCIA if enabled, normally
BIOS expansion
ÁÁÁÁÁÁÁÁ
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
configurations 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
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
ÁÁÁÁÁÁÁÁ
PCI expansion
ÁÁÁÁÁÁÁÁ
FFF8 0000 FFFD FFFF 512-128k
ÁÁÁÁÁÁÁÁ
ISA memory, dual-port memory
application
ÁÁÁÁÁÁÁÁ
FFFE 0000 FFFF FFFF 128k
ÁÁÁÁÁÁÁÁ
System BIOS (shadow of 000E
0000 .. 000F FFFF)
ÁÁÁÁÁÁÁÁ
Hardware Information