Desktop board resources, Memory map, Dma channels – Intel D845PESV User Manual

Page 69

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Technical Reference

69

Desktop Board Resources

Memory Map

Table 32. System Memory Map

Address Range (decimal) Address Range (hex)

Size

Description

1024 K - 2097152 K

100000 - 7FFFFFF

2047 MB

Extended Memory

960 K - 1024 K

F0000 - FFFFF

64 KB

Runtime BIOS

896 K - 960 K

E0000 - EFFFF

64 KB

Reserved

800 K - 896 K

C8000 - DFFFF

96 KB

Available high DOS memory (open to the
PCI bus)

640 K - 800 K

A0000 - C7FFF

160 KB

Video memory and BIOS

639 K - 640 K

9FC00 - 9FFFF

1 KB

Extended BIOS data (movable by
memory manager software)

512 K - 639 K

80000 - 9FBFF

127 KB

Extended conventional memory

0 K - 512 K

00000 - 7FFFF

512 KB

Conventional memory

DMA Channels

Table 33. DMA Channels

DMA Channel Number

Data Width

System Resource

0

8 or 16 bits

1

8 or 16 bits

Parallel port

2

8 or 16 bits

Floppy drive

3

8 or 16 bits

Parallel port (for ECP or EPP)

4

8 or 16 bits

DMA controller

5 16

bits

Open

6 16

bits

Open

7 16

bits

Open

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