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Technical Reference Guide
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
4-35
4.8 REGISTER MAP AND MISCELLANEOUS FUNCTIONS
This section contains the system I/O map and information on general-purpose functions of the ICH
and I/O controller.
4.8.1 SYSTEM I/O MAP
Table 4-14 lists the fixed addresses of the input/output (I/O) ports.
Table 4-14. System I/O Map
Table 4-14.
System I/O Map
I/O Port Function
0000..001Fh DMA Controller 1
0020..002Dh Interrupt Controller 1
002E, 002Fh Index, Data Ports to LPC47B357 I/O Controller (primary)
0030..003Dh Interrupt Controller
0040..0042h Timer 1
004E, 004Fh Index, Data Ports to LPC47B357 I/O Controller (secondary)
0050..0052h Timer / Counter
0060..0067h Microcontroller, NMI Controller (alternating addresses)
0070..0077h RTC Controller
0080..0091h DMA Controller
0092h Port A, Fast A20/Reset Generator
0093..009Fh DMA Controller
00A0..00B1h Interrupt Controller 2
00B2h, 00B3h APM Control/Status Ports
00B4..00BDh Interrupt Controller
00C0..00DFh DMA Controller 2
00F0h Coprocessor error register
0170..0177h IDE Controller 2 (active only if standard I/O space is enabled for primary drive)
01F0..01F7h IDE Controller 1 (active only if standard I/O space is enabled for secondary drive)
0278..027Fh Parallel Port (LPT2)
02E8..02EFh Serial Port (COM4)
02F8..02FFh Serial Port (COM2)
0370..0377h Diskette Drive Controller Secondary Address
0376h IDE Controller 2 (active only if standard I/O space is enabled for primary drive)
0378..037Fh Parallel Port (LPT1)
03B0..03DFh Graphics Controller
03BC..03BEh Parallel Port (LPT3)
03E8..03EFh Serial Port (COM3)
03F0..03F5h Diskette Drive Controller Primary Addresses
03F6h IDE Controller 1 (active only if standard I/O space is enabled for sec. drive)
03F8..03FFh Serial Port (COM1)
04D0, 04D1h Interrupt Controller
0678..067Fh Parallel Port (LPT2)
0778..077Fh Parallel Port (LPT1)
07BC..07BEh Parallel Port (LPT3)
0CF8h PCI Configuration Address (dword access only )
0CF9h Reset Control Register
0CFCh PCI Configuration Data (byte, word, or dword access)
NOTE:
Assume unmarked gaps are unused, reserved, or used by functions that employ variable I/O
address mapping. Some ranges may include reserved addresses.