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7.2
Memory Area
The first 640 kB of DRAM are used as main memory. Using DOS, you can address 1 MB of memory directly. Memory area
above 1 MB (high memory, extended memory) is accessed under DOS via special drivers such as HIMEM.SYS and
EMM386.EXE, which are part of the operating system. Please refer to the operating system documentation or special
textbooks for infor- mation about HIMEM.SYS and EMM386.EXE.
Other operating systems (Linux or Windows versions) allow you to address the full memory area directly.
Upper Memory
Used for
A0000h – BFFFFh
VGA Memory
C0000h – CFFFFh
VGA BIOS
D0000h – DFFFFh
E0000h – FFFFFh
System BIOS
60
Available
Comment
No
Mainly used by graphic controller
No
Used by onboard VGA ROM
Yes
Free for shadow RAM in standard configurations.
No
Fixed
microETXexpress®-SP / System Ressources
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