Summary Of The Hp/Phoenix Bios; Hp/Phoenix Bios Description; Overview Of Address Space; I/O Addresses Used By The System - HP Vectra VL5 4 Technical Reference Manual

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SUMMARY OF THE HP/PHOENIX BIOS

This chapter is a summary of the main features of the new HP/Phoenix system BIOS.
For a more detailed description, refer to the manual System BIOS for IBM PCs, Compatibles,
and EISA Computers by Phoenix Technologies Ltd. Information for ordering this manual is
given in the preface.

HP/PHOENIX BIOS DESCRIPTION

This chapter and the following two chapters give an overview of the HP/Phoenix BIOS. The
information is divided into three main sections:
• The address space, with details of the interrupts used, described in this chapter.
• The Desktop Management Interface or DMI, which is the new method for storing and
accessing information about the PC, described in chapter 3.
• The Power-On-Self-Test or POST, which is the sequence of tests the PC performs to
ensure that the system is functioning correctly, described in chapter 4.

OVERVIEW OF ADDRESS SPACE

Peripheral devices, accessory devices and system controllers are accessed via the system I/O
space, which is not located in system memory space. The 64 KB of addressable I/O space
comprises 8-bit and 16-bit registers (called I/O ports) located in the various system
components. When installing an accessory board, ensure that the I/O address space selected
is in the free area of the space reserved for accessory boards (100h to 3FFh).

I/O ADDRESSES USED BY THE SYSTEM*

170h-177h, 376h
1F0h-1F7h, 3F6h
278h-27Fh
2E8h-2EFh
2F8h-2FFh
370h-371h
378h-37Fh
3B0h-3DFh
3E8h-3EFh
3F0h-3F5h, 3F7h
3F8h-3FFh
496h-497h
678h-67Bh
778h-77Bh
*If configured.
Refer to the "HP BIOS I/O Port Map" in this chapter for more detailed information.
IDE secondary channel
IDE primary channel
Parallel port
Serial Port
Serial Port
Integrated I/O Controller
Parallel Port
Integrated video graphics controller
Serial Port
Integrated flexible disk drive controller
Serial Port
HP reserved
Parallel port if ECP mode is selected
Parallel port if ECP mode is selected