System memory map specifications

Size

Memory address

System function

 

 

 

640 KB

00000000–0009FFFF

Base memory

 

 

 

128 KB

000A0000–000BFFFF

Video memory

 

 

 

64 KB

000C0000–000CFFFF

Video BIOS

 

 

 

64 KB

000E8000–000FFFFF

System BIOS

 

 

 

 

00100000–XFFFFFFF

Extended memory (based on memory

 

 

installed)

 

 

 

 

(X+1)0000000–FEDFFFFF

PCI bus

 

 

 

 

FED00000–FED003FF

High-precision event timer

 

 

 

 

FEE01000–FFFFFFFF

PCI bus

 

 

 

76 Chapter 5 Specifications