I/O Map

Table 31. I/O Map

Address (hex)

0000 - 000F

0020 - 0021

0040 - 0043

0060

0061

0064

0070 - 0071

0072 - 0073

0080 - 008F

0092

00A0 - 00A1

00B2 - 00B3

00C0 - 00DF

00F0

0170 - 0177

01F0 - 01F7

0228 - 022F*

0278 - 027F*

02E8 - 02EF*

02F8 - 02FF*

0376

0377, bits 6:0

0378 - 037F

03B0 - 03BB

03C0 - 03DF

03E8 - 03EF

03F0 - 03F5

03F6

03F8 - 03FF

04D0 - 04D1

LPTn + 400

0CF8 - 0CFB**

0CF9***

0CFC - 0CFF

FFA0 - FFA7

FFA8 - FFAF

Size

16bytes

2bytes

4bytes

1byte

1byte

1byte

2bytes

2bytes

16bytes

1byte

2bytes

2bytes

32bytes

1byte

8bytes

8bytes

8bytes

8bytes

8bytes

8bytes

1byte

7bits

8bytes

12bytes

32bytes

8bytes

6bytes

1byte

8bytes

2bytes

8bytes

4bytes

1byte

4bytes

8bytes

8bytes

Technical Reference

Description

DMA controller

Programmable Interrupt Control (PIC)

System timer

Keyboard controller byte— reset IRQ

System speaker

Keyboard controller, CMD / STAT byte

System CMOS / Real Time Clock

System CMOS

DMA controller

Fast A20 and PIC

PIC

APM control

DMA

Numeric data processor

Secondary IDE channel

Primary IDE channel

LPT3

LPT2

COM4 / video (8514A)

COM2

Secondary IDE channel command port

Secondary IDE channel status port

LPT1

Video (VGA)

Video (VGA)

COM3

Diskette channel 1

Primary IDE channel command port

COM1

Edge / level triggered PIC

ECP port, LPTn base address + 400h

PCI configuration address register

Turbo and reset control register

PCI configuration data register

Primary bus master IDE registers

Secondary bus master IDE registers

continued

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Intel D845HV, D845WN manual O Map, Address hex, Technical Reference Description

D845HV, D845WN specifications

The Intel D845WN and D845HV motherboards have garnered attention for their robust features and reliability, making them suitable choices for a range of computing needs. Both motherboards belong to Intel’s 845 chipset family, which was designed to support the Pentium 4 processors, providing a foundation for both performance and value.

The Intel D845WN motherboard is recognized for its standard ATX form factor, which allows for versatility in case selection and expands the options for build configurations. It supports the Pentium 4 processors with a socket 478 interface, accommodating speeds of 1.3 GHz to 3.0 GHz. This motherboard is equipped with a front-side bus (FSB) speed of 400/533 MHz, ensuring fast data transfer rates between the processor and other components.

On the memory side, the D845WN supports up to 2 GB of DDR SDRAM, making it compatible with a range of memory options for efficient multitasking and improved performance. It features two memory slots for Dual Channel DDR support, enhancing memory bandwidth. The onboard graphics capabilities are powered by Intel's integrated graphics, making the D845WN capable of basic graphical tasks without requiring a dedicated graphics card, ideal for general computing or light gaming.

In contrast, the D845HV model shares many similarities with the D845WN but emphasizes additional features that cater to more advanced users. It includes support for Intel's RAID technology, allowing users to set up mirrored or striped disk configurations for improved data redundancy and performance. Furthermore, the D845HV motherboard comes with more extensive expansion slots, including additional PCI and an AGP slot for dedicated graphics cards, enhancing its overall upgradeability.

Both motherboards include integrated audio capabilities courtesy of Intel’s AC'97 Audio technology, ensuring satisfactory sound output for everyday multimedia use. Networking is facilitated through integrated Ethernet support, enabling reliable internet connectivity without needing additional network cards.

In terms of expansion and connectivity, both models feature USB ports, allowing users to connect multiple peripherals effortlessly. The combination of legacy and contemporary interfaces on the D845WN and D845HV ensures compatibility with a wide range of devices and peripherals.

In summary, the Intel D845WN and D845HV motherboards epitomize value-driven performance, offering essential features that cater to a variety of users, from casual computer users to more demanding applications. With their solid build quality and Intel's backing, these motherboards continue to be appreciated even in today's evolving computing landscape.