System I/O Addresses 179
0070h
NMI Mask (bit 7) & RTC
Address (bits 6::0)
PIIX4E
0072h
NMI Mask (bit 7) & RTC
Address (bits 6::0)
PIIX4E
Aliased from 0070h
0074h
NMI Mask (bit 7) & RTC
Address (bits 6::0)
PIIX4E
Aliased from 0070h
0076h
NMI Mask (bit 7) & RTC
Address (bits 6::0)
PIIX4E
Aliased from 0070h
0071h
RTC Data
PIIX4E
0073h
RTC Data
PIIX4E
Aliased from 0071h
0075h
RTC Data
PIIX4E
Aliased from 0071h
0077h
RTC Data
PIIX4E
Aliased from 0071h
0080h - 008Fh
DMA Low Page Register
PIIX4E
0090h - 0091h
DMA Low Page Register
PIIX4E
Aliased
0092h
System Control Port A
(PC-AT control Port)
PIIX4E
Not aliased in DMA range
0093h - 009Fh
DMA Low Page Register
PIIX4E
Aliased
0094h
Video Display Controller
00A0h - 00A1h
Interrupt Controller 2
PIIX4E
00A4h - 00A15
Interrupt Controller 2
PIIX4E
Aliased
00A8h - 00A19
Interrupt Controller 2
PIIX4E
Aliased
00Ach - 00Adh
Interrupt Controller 2
PIIX4E
Aliased
00B0h - 00B1h
Interrupt Controller 2
PIIX4E
Aliased
00B2h
Advanced Power
Management Control
PIIX4E
00B3h
Advanced Power
Management Status
PIIX4E
00B4h - 00B5h
Interrupt Controller 2
PIIX4E
Aliased
00B8h - 00B9h
Interrupt Controller 2
PIIX4E
Aliased
00BCh - 00BDh
Interrupt Controller 2
PIIX4E
Aliased
00C0h - 00DFh
DMA Controller 2
PIIX4E
00F0h
Clear NPX error
Resets IRQ13
00F8h - 00FFh
x87 Numeric Coprocessor
0102h
Video Display Controller
0170h - 0177h
Secondary Fixed Disk
Controller (IDE)
PIIX4E
Not used
01F0h - 01F7h
Primary Fixed Disk
Controller (IDE)
PIIX4E
0200h - 0207h
Game I/O Port
Not used
Table 37: System I/O Addresses (Continued)
Address
Resource
Device
Notes
3424.boo Page 179 Wednesday, September 2, 1998 9:23 AM