4 Summary of the HP/Phoenix BIOS

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

I/O Address Ports

Function

Bits

 

 

 

0378-037F

Parallel port 2

 

 

 

 

03B0-03BB

Integrated video graphics controller

 

 

 

 

03BC--03BF

Parallel port 1

 

 

 

 

03C0-03DF

Integrated video graphics controller

 

 

 

 

03E8-03EF

Serial port 3

 

 

 

 

03F0-03F5

Floppy disk controller

 

 

 

 

03F6

IDE controller primary channel

 

 

 

 

03F7

Floppy disk controller

 

 

 

 

03F8-03FF

Serial port 1

 

 

 

 

0496-0497

Internal ports (or HP reserved)

 

 

 

 

0CF8-0CFF

Used for PCI configuration1

 

1.These addresses are dedicated to configuration registers for PCI devices.

System Board Components (BIOS version: GX.07.xx)

This section provides more details of how the BIOS uses the system board components mentioned in the I/O port list.

DMA Channel Controllers (BIOS version: GX.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.

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