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System Address Map
R
98 Intel
®
82845 MCH for SDR Datasheet
Figure 4. DOS Compatible Area Address Map
Monochrome Display
Adapter Space
Upper, Lower,
Expansion Card BIOS
and Buffer Area
1 MB
sys_addr_map_2
640 KB
704 KB
736 KB
768 KB
0A0000h
0B0000h
0B8000h
0C0000h
Standard PCI/ISA
Video Memory
(SMM Memory)
Controlled by
PAM[6:0]
Controlled by
VGA Enable and
MDA Enable
= Optional AGP
= Optional System Memory
= System Memory
Figure 5. Extended Memory Range Address Map
= System Memory Region
= Optional System Memory Region
1_0000_0000 (4 GB)
FEF0_0000
FEE0_0000
FED0_0000
Top of Low Memory (TOM)
FEC0_0000
FEC8_0000
FF00_0000
100A_0000
100C_0000
00F0_0000 (15 MB)
0100_0000 (16 MB)
0010_0000 (1 MB)
TEM - TSEG
High BIOS, Optional
extended SMRAM
sys_addr_map_3
ISA Hole
Extended SMRAM
(translated to < 1 MB)
Extended SMRAM
Space
Local APIC Space
I/O APIC Space
I/O APIC Space
AGP/PCI
Hub Interface
(always)
Hub Interface
(always)