Bios I/O Port Map (Bios Version: Gj.07.Xx) - HP 525 5/XX Technical Reference Manual

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
0000-000F
0020-0021
0040-0043
0060, 0064
0061
0070
0071
0081-0083, 008F
0092
0096-009F
00A0-00A1
00C0-00DF
00F0-00FF
0170-0177, 0376
01F0-01F7
0278-027F
02E8-02EF
02F8-02FF
0370-0377
0378-037F
03B0-03DF
03C0-03DF
4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GJ.07.xx)
Function
DMA Controller 1
Interrupt Controller 1
Interval Timer 1
Keyboard Controller
NMI Status and Control
NMI Mask register, RTC address
RTC data
DMA Low Page register
Alternate reset and A20 Function
Internal Ports
Interrupt Controller 2
DMA Controller 2
Co-processor error
Secondary IDE Controller
Primary IDE Controller
Parallel Port 3
Serial Port 4
Serial Port 2
Secondary Floppy Disk Controller
Parallel Port 2
Integrated Video Graphics Controller
Integrated Video Graphics Controller
Bits
8
8
8
8
8
8
8
8
8
8
8
8
105