Compaq Deskpro EP 6233 - I;O Map and Register Accessing

Chapter 4 System Support
Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
4-46
4.7 I/O MAP AND REGISTER ACCESSING
4.7.1 SYSTEM I/O MAP
Table 4–19.
System I/O Map
Table 4-19.
System I/O Map
I/O Port Function
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/Lower CMOS Data
0072h, 0073h Upper CMOS Index/Data
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
00E8, 00E9h GPIO Ports 1 and 2 (87309)
00F0h Math Coprocessor Busy Clear
015C, 015Dh 87309 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)
0300-030Fh Network interface controller
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
0C7Ch Machine ID
0C80, 0C81h Scan Chain High/Low Bytes
0C82h Auto Rev Data
0C83h Machine ID
0CD6h, 0CD7h Power Management Registers
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.