Appendix D Memory Map

Address Range (Decimal)

Address Range (hex)

Size

Description

1024K-131072K

100000-8000000

127M

Extended Memory

960K-1023K

F0000-FFFFF

64K

AMI System BIOS

952K-959K

EE000-EFFFF

8K

FLASH Boot Block (Available as UMB)

948K-951K

ED000-EDFFF

4K

ESCD (Plug and 'Play configuration area)

944K-947K

EC000-ECFFF

4K

OEM LOGO (available as UMB)

896K-943K

E0000-EBFFF

48K

BIOS RESERVED (Currently available as UMB)

800K-895K

C8000-DFFFF

96K

Available HI DOS memory (open to ISA and PCI bus)

640K-799K

A0000-C7FFF

160K

Available HI DOS memory (open to ISA and PCI bus)

639K

9FC00-9FFFF

1K

Extended BIOS Data (moveable by QEMM, 386MAX)

512K-638K

80000-9FBFF

127K

Extended conventional

0K-511K

00000-7FFFF

512K

Conventional

 

 

 

 

 

Table D

-1. Advanced/ZP

Memory Map

The table above details the Advanced/ZE memory map. The ESCD area from ED000-EDFFF is not available for use as an Upper Memory Block (UMB) by memory managers. The area from E0000-EBFFF is currently not used by the BIOS and is available for use as UMB by memory managers. Parts of this area may be used by future versions of the BIOS to add increased functionality.

Appendix E Interrupts & DMA Channels

IRQ

System Resource

NMI

Unused

0

Reserved, Interval Timer

1

Reserved, Keyboard buffer full

2

Reserved, Cascade interrupt from slave PIC

3

Serial Port 2

4

Serial Port 1

5

Parallel Port 2

6

Floppy

7

Parallel Port 1

8

Real Time Clock

9

User available

10

User available

11

User available

12

User available

13

Reserved, Math coprocessor

14

Primary IDE if enabled, else available to user

15

Secondary IDE if enabled, else available to user

Table E-1.Advanced/ZP Interrupts

DMA

Data Width

System Resource

0

8- or 16-bits

Open

1

8- or 16-bits

Open - Normally used for LAN

2

8- or 16-bits

Floppy

3

8- or 16-bits

Parallel Port

4

 

Reserved - Cascade channel

5

16-bits

Open

6

16-bits

Open

7

16-bits

ISA IDE

Table E-2. Advanced/ZP DMA Map

Advanced/ZP Technical Product Summary Page 18

Page 18
Image 18
Intel 281786-002 manual Appendix D − Memory Map, Appendix E − Interrupts & DMA Channels

281786-002 specifications

The Intel 281786-002 is a highly regarded microprocessor that was part of Intel’s extensive portfolio of technology solutions. Originally released in the mid-1990s, it is recognized for its robust performance and advanced features, which catered to the needs of both personal computing and embedded systems.

One of the standout features of the Intel 281786-002 is its architecture, which includes a 32-bit data bus. This architecture allows for efficient data processing and memory management. The processor is built on a 0.6-micron process technology, contributing to reduced power consumption while enhancing overall performance. The chip operates at various clock speeds, typically ranging around 25MHz to 50MHz, allowing it to suit different applications and user requirements.

The Intel 281786-002 also boasts a sophisticated instruction set that supports a wide range of operations. This multi-functionality ensures that it can efficiently handle complex computations and multitasking scenarios. Its ability to execute instructions in parallel paves the way for better performance when running multiple applications simultaneously.

In terms of memory support, the processor is designed to interface effectively with both SRAM and DRAM technologies, accommodating a vast range of memory configurations, thereby enhancing flexibility for system designers. It is also compatible with both 16-bit and 32-bit data buses, making it versatile enough for use in various computing environments.

Another notable aspect of the Intel 281786-002 is its integrated security features. These allow for better data protection and integrity, making it a viable choice for systems requiring enhanced security protocols.

Furthermore, the microprocessor's reliability and stability have made it a preferred choice for embedded applications, network devices, and industrial systems. Its proven track record in various computing environments underscores Intel's commitment to quality and performance.

Additionally, the Intel 281786-002 supports various operating systems, providing flexibility in deployment across different computing platforms. This compatibility ensures that users can leverage existing software ecosystems without extensive modifications.

In conclusion, the Intel 281786-002 microprocessor encapsulates an amalgamation of performance, efficiency, and versatility. With its advanced features and robust architecture, it has played a significant role in shaping computing technology, making it a noteworthy component in Intel’s legacy of innovation.