Compaq deskpro en series Manual De Usuario

4-46

Table 4–19.   System I/O Map

            System I/O Map

0000..000Fh

DMA Controller 1

0020..0021h

Interrupt Controller 1

0040..0043h

Timer 1

0060h

Keyboard Controller Data Byte

0061h

NMI, Speaker Control

0064h

Keyboard Controller Command/Status Byte

0070h

NMI Enable, RTC/Lower CMOS Index

0071h

RTC Data

0078h-007Bh

GPIO Port 1 Control (87307 I/O controller)

007Ch-007Fh

GPIO Port 2 Control (87307 I/O controller)

0080..008Fh

DMA Page Registers

0092h

Port A, Fast A20/Reset

00A0..00A1h

Interrupt Controller 2

00B2h, 00B3h

APM Control/Status Ports

00C0..00DFh

DMA Controller 2

00F0h

Math Coprocessor Busy Clear

015C, 015Dh

87307 I/O Controller Configuration Registers (Index, Data)

0170..0177h

Hard Drive (IDE) Controller 2

01F0..01FFh

Hard Drive (IDE) Controller 1

0201..024Fh

Audio subsystem control (primary & secondary addresses)

0278..027Bh

Parallel Port (LPT2)

02F8..02FFh

Serial Port (COM2)

0371.. 0375h

Diskette Drive Controller Alternate Addresses

0376h

IDE Controller Alternate Address

0377h

IDE Controller Alternate Address, Diskette Drive Controller Alternate Address

0378..037Fh

Parallel Port (LPT1)

0388..038Bh

FM synthesizer (alias addresses)

03B0..03DFh

Graphics Controller

03E8..03EFh

Serial Port (COM3)

03F0..03F5h

Diskette Drive Controller Primary Addresses

03F6, 03F7h

Diskette Drive Controller Primary Addresses, Hard Drive Controller Primary Addresses

03F8..03FFh

Serial Port (COM1)

04D0, 04D1h

Master, Slave Edge/Level INTR Control Register

0C00, 0C01h

PCI IRQ Mapping Index, Data

0C06, 0C07h

Reserved - Compaq proprietary use only

0C50, 0C51h

System Management Configuration Registers (Index, Data)

0C52h

General Purpose Port

0C7Ch

Machine ID

0CF8h

PCI Configuration Address (dword access)

0CF9h

Reset Control Register

0CFCh

PCI Configuration Data (byte, word, or dword access)

FF00..FF07h

IDE Bus Master Register

NOTE:  Assume unmarked gaps are reserved/unused.