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Technical Manual "Thunderbird/MM” Version 1.2
12.08.2005
Page 40 of 48
5 Software Specifications
5.1 System Address Map
This section describes the mapping of the CPU memory and I/O address spaces. Also covered in
this section are the PCI configuration space mapping.
Note:
Depending on enabled or disabled functions
in the BIOS, other or more resources may
be used!
Memory address map
Address Range
(Dec)
Address Range
(Hex)
Size
Description
1024K – XXXXXK
100000 – XXXXXX
xxxx
Extended Memory
960K – 1024K
0F0000 – 0FFFFF
64K
System Bios
823K – 880K
0CC800 – 0EFFFF
~142K
Free
768K – 823K
0C0000 – 0CC7FF
~50K
Adapter ROM
704K – 768K
0B0000 – 0BFFFF
64K
VGA Adapter
640K – 704K
0A0000 – 0AFFFF
64K
VGA Adapter
0K – 640K
0 – 9FFFF
640K
Conventional Memory
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