HP Vectra VL800, Техническое справочное руководство

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6 HP BIOS
BIOS Addresses
BIOS Addresses
This section provides a summary of the main features of the HP system
BIOS. This is software that provides an interface between the computer
hardware and the operating system.The procedure for updating the System
ROM firmware is described on
page 113 .
HP I/O Port Map (I/O Addresses Used by the System
1
)
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).
1.If configured.
Default Values for
I/O Address Ports
Function
0000 - 000F DMA controller 1
0020 - 0021 Master interrupt controller (8259)
002E - 002F Super I/O
0040 - 0043 Timer 1
0060, 0064 Keyboard controller (reset, slow A20)
0061 Port B (speaker, NMI status and control)
0070 Bit 7: NMI mask register
0081 - 0083, 008F DMA low page register
0092 PS/2 reset and Fast A20
00A0 - 00A1 Slave interrupt controller
00C0 - 00DF DMA controller 2
00F0 - 00FF Co-processor error
0170 - 0177 Free (IDE secondary channel)
01F0 - 01F7 IDE primary channel
0278 - 027F LPT 2
02E8 - 02EF Serial port 4 (COM4)
02F8 - 02FF Serial port 2 (COM2)
0372 - 0377 Free (IDE secondary channel, secondary floppy disk drive)