104
4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GJ.07.xx)
I/O Addresses Used by the System (BIOS version: GJ.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).
Refer to the BIOS I/O Port Map (BIOS version: GJ.07.xx), on page 105 for
more detailed information.
System Memory Map (BIOS version: GJ.07.xx)
NOTE
Reserved memory used by expansion cards must be located in the
area from C8000h to EFFFFh.
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
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
E000h - EFFFFh
64 KB
–
Available
F0000h - FFFFFh
64 KB
–
System BIOS
100000h - FFFFFFFFh
1 MB plus
–
Extended Memory