System DMA specifications

 

Hardware

DMA System function

 

 

 

 

DMA0

Not applicable

 

 

 

 

DMA1*

Not applicable

 

 

 

 

DMA2*

Not applicable

 

 

 

 

DMA3

Not applicable

 

 

 

 

DMA4

Direct memory access controller

 

 

 

 

DMA5*

Not applicable

 

 

 

 

DMA6

Not assigned

 

 

 

 

DMA7

Not assigned

 

 

 

 

*PC Card controller can use DMA 1, 2, or 5.

 

 

 

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

 

 

 

Specifications

6–7