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4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GJ.07.xx)
Addressing System Board Components
(BIOS version: GJ.07.xx)
This section provides further details of how the BIOS uses the system board
components mentioned in the I/O port list.
DMA Channel Controllers (BIOS version: GJ.07.xx)
Only “I/O-to-memory” and “memory-to-I/O” transfers are allowed.
“I/O-to-I/O” and “memory-to-memory” transfers are disallowed by the
hardware configuration.
The system controller supports seven DMA channels, each with a page
register used to extend the addressing range of the channel to 16 MB.
1.
These addresses are dedicated to configuration registers for PCI devices.
03BC-03BF Parallel Port 1
03F0--03F5-03F7 Integrated Floppy Disk Controller
03F8-03FF Serial Port 1
03E8-03EF Serial Port 3
0CF8-0CFF Used for PCI Configuration
1
0496-0497 HP Reserved
0678-067A Parallel Port if ECP Mode is Selected
0778-077A Parallel Port if ECP Mode is Selected
I/O Address Ports Function Bits