4 Summary of the HP/Phoenix BIOS

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

I/O Address Ports

Function

Bits

 

 

 

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 Configuration1

 

0496-0497

HP Reserved

 

 

 

 

0678-067A

Parallel Port if ECP Mode is Selected

 

 

 

 

0778-077A

Parallel Port if ECP Mode is Selected

 

 

 

 

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

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.

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