APPENDIX A: Server Specifications

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Electronic specifications

Memory map

Address Range (hex)

Amount

Function

 

 

 

0 to 07FFFFh

640 KB

DOS region, base system memory

 

 

 

0A0000h to 0BFFFFh

128 KB

Video or SMM memory

 

 

 

0C0000h and 0DFFFFh

128 KB

Expansion card BIOS and buffer area

 

 

 

0E0000h to 0FFFFFh

128 KB

System BIOS

 

 

 

0E0000h to 0EFFFFh

2 MB

Extended system BIOS

 

 

 

FC000000h to FFFFFFFFh

64 MB

PCI memory space

 

 

 

Interrupts

Important

If you disable an IDE controller to free the interrupt for that controller, you must physically unplug the IDE cable from the system board. Simply disabling the drive by configuring the BIOS option does not make the interrupt available.

The following table reflects a typical configuration, but you can change these interrupts. Use this information to determine how to program each interrupt.

ISA Interrupt

Description

 

 

IRQ0

8254 timer

 

 

IRQ1

Keyboard controller

 

 

IRQ2

Cascade for IRQ9

 

 

IRQ3

Free

 

 

IRQ4

Serial port

 

 

IRQ5

Hot-plug SCSI controller

 

 

IRQ6

Diskette controller

 

 

IRQ7

Free

 

 

IRQ8

Real-time clock

 

 

IRQ9

Generic, Option for SCI

 

 

IRQ10

VGA

 

 

IRQ11

USB

 

 

IRQ12

Mouse controller

 

 

IRQ13

Numeric data processor

 

 

IRQ14

Primary IDE controller

 

 

IRQ15

Secondary IDE controller

 

 

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