5 Desktop Board Resources

Memory Map

Table 13. System Memory Map

Address Range (decimal)

Address Range (hex)

Size

Description

 

 

 

 

1024 K - 4194304 K

100000 - FFFFFFFF

4095 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 14. 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

 

 

 

71

Page 71
Image 71
Intel D915GAV, D915GAG, D915GUX, D915GEV manual Desktop Board Resources, DMA Channels, System Memory Map

D915GAV, D915GEV, D915GUX, D915GAG specifications

The Intel D915GAG, D915GUX, D915GEV, and D915GAV are part of Intel's 915 chipset series, which was introduced to enhance the performance and capabilities of desktop computers in the mid-2000s. These motherboards provided users with a balanced combination of features suitable for both general computing and gaming needs.

The D915GAG motherboard features support for Intel Pentium 4 processors with the LGA 775 socket, providing robust performance for a range of applications. It supports a maximum of 4 GB of DDR2 RAM, ensuring that users can run multiple applications smoothly. The chipset supports a front-side bus speed of up to 800 MHz, facilitating quick data transfer rates that enhance overall system responsiveness.

The D915GUX variant is known for its enhanced graphics capabilities, featuring Intel Graphics Media Accelerator 900 integrated graphics. This component provides a decent visual experience for casual gaming and multimedia tasks without the need for a dedicated graphics card. The board also includes PCI Express x16 slots, enabling expansion for those who require higher graphical performance.

The D915GEV model stands out for its extensive connectivity options. It comes equipped with multiple USB 2.0 ports, SATA interfaces for faster data storage solutions, and built-in Ethernet to facilitate internet connectivity. The D915GEV is designed with stability and reliability in mind, making it suitable for use in both personal and professional environments.

Lastly, the D915GAV offers an alternative for users seeking a reliable and cost-effective chipset. It supports Intel’s SpeedStep technology, which dynamically adjusts processor voltage and frequency according to workload, optimizing energy consumption. This model emphasizes user-friendly performance, making it a practical choice for home users and small businesses alike.

All models support Intel Quiet System Technology, reducing fans' noise levels and maintaining an efficient cooling environment, which is essential for long-term reliability. Collectively, the Intel D915 series motherboards emphasize versatility, solid performance, and expanded connectivity options, making them a worthy choice for various computing needs during their time.