HP Vectra 500 Series - Manual (Page 91)

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4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GX.07.xx)
BIOS I/O Port Map (BIOS version: GX.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
00A0-00A1 Interrupt controller 2 8
00C0-00DF DMA controller 2 8
00F0-00FF Co-processor error
0100-0109 HP reserved
015C-015D I/O Controller
0170-0177 IDE controller secondary channel
01F0-01F7 IDE controller primary channel
0278-027F Parallel port 3
02E8-02EF Serial Port 4
02F8-02FF Serial Port 2
0370-0375 Secondary floppy disk controller
0376 IDE controller secondary channel
0377 Secondary floppy disk controller