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4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GJ.07.xx)
BIOS I/O Port Map (BIOS version: GJ.07.xx)
This section describes the HP BIOS port map. The next section provides
more details about how the BIOS uses the system board components
mentioned in the I/O port list.
I/O Address Ports
Function
Bits
0000-000F
DMA Controller 1
8
0020-0021
Interrupt Controller 1
8
0040-0043
Interval Timer 1
8
0060, 0064
Keyboard Controller
8
0061
NMI Status and Control
8
0070
NMI Mask register, RTC address
8
0071
RTC data
8
0081-0083, 008F
DMA Low Page register
8
0092
Alternate reset and A20 Function
8
0096-009F
Internal Ports
8
00A0-00A1
Interrupt Controller 2
8
00C0-00DF
DMA Controller 2
8
00F0-00FF
Co-processor error
0170-0177, 0376
Secondary IDE Controller
01F0-01F7
Primary IDE Controller
0278-027F
Parallel Port 3
02E8-02EF
Serial Port 4
02F8-02FF
Serial Port 2
0370-0377
Secondary Floppy Disk Controller
0378-037F
Parallel Port 2
03B0-03DF
Integrated Video Graphics Controller
03C0-03DF
Integrated Video Graphics Controller