4 Summary of the HP/Phoenix BIOS

HP/Phoenix BIOS (BIOS version: GX.07.xx)

I/O Addresses Used by the System (BIOS version: GX.07.xx)

Peripheral devices, accessory devices and system controllers are accessed via the system I/O space. The 64 KB of addressable I/O space comprises 8-bit and 16-bit I/O ports (these are registers that are located in the various system components). When installing an expansion card, ensure that the I/O address space selected is in the free area of the space reserved for expansion cards (100h to 3FFh).

100h-109h

HP reserved

15Ch-15Dh

I/O controller

170h-177h, 376h

IDE controller secondary channel

1F0h-1F7h, 3F6h

IDE controller primary channel

278h-27Fh, 378h-37Fh

Parallel port

2E8h-2EFh, 2F8h-2FFh, 3E8h-3EFh, 3F8h-3FFh

Serial port

370h-371h

Integrated I/O Controller

3B0h-3DFh

Integrated video graphics controller

3F0h-3F5h, 3F7h

Integrated floppy disk drive controller

496h-497h

HP reserved

678h-67Bh

Parallel port if ECP mode is selected

778h-77Bh

Parallel port if ECP mode is selected

Refer to the BIOS I/O Port Map (BIOS version: GX.07.xx), on page 91 for more detailed information.

System Memory Map (BIOS version: GX.07.xx)

00000h - 9FFFFh

640 KB– Base Memory Area

A0000h - BFFFFh

128 KB– Video Memory

C0000h - C7FFFh

32

KB– Video BIOS

C8000h - DFFFFh

96

KB– Expansion Cards Memory

E0000h - EFFFFh

64 KB– Available

F0000h - FFFFFh

64

KB– System BIOS

100000h - FFFFFFFFh

1 MB plus– Extended Memory

Reserved memory used by expansion cards must be located in the area from C8000h to EFFFFh.

90