Pci Slots; Isa Connector - HP X Class 500/550MHz Reference Manual

PCI Slots

There is a total of five Peripheral Component Interconnect (PCI) connectors on the system
board. From top to bottom, the PCI slots are numbered 1 to 5 (refer to the diagram on the
previous page). The third PCI connector has a special extension called ARO or FastRaid
connector (refer to the section "FastRAID Port" for details about this connector), into which
the HP FastRAID accessory board can be installed. The fifth PCI connector shares the
corresponding slot with an ISA connector. This slot is called a Combo (Combination) slot,
since a PCI board or an ISA board can be installed in it.
The system board and BIOS support the PCI specification 2.1. It fully supports PCI-to-PCI
bridges and multi-function PCI devices, and each of the five PCI slots has Master
capabilities.
The maximum supported power consumption per slot is 25W, either from the 5V or the
3.3V supply and must respect the electrical specifications of the PCI 2.1 specification. Total
power consumption for the PCI slots must not exceed 85W.
The power consumption of each PCI board is automatically reported to the system through
the two Presence Detect pins of each PCI slot. These pins code the following cases:
• No accessory board in the PCI slot.
• 7W maximum PCI board in the PCI slot.
• 15W maximum PCI board in the PCI slot.
• 25W maximum PCI board in the PCI slot.
This information is reported in the BIOS setup screen. If the total power used in the PCI
slots exceeds 85W, the BIOS will display a warning during the boot sequence.
In addition to these PCI slots, there are three other devices connected on the PCI Bus:
• 440GX AGPset chipset, bridge between the Processor Front Side Bus (FSB) and the PCI
bus.
• PIIX4E chip, bridge between the PCI and the ISA, USB and IDE buses.
• AIC 7880 chip from Adaptec, PCI to SCSI (wide) controller.
Devices on the PCI bus are explained in the section "Devices on the PCI Bus" in this
chapter.

ISA Connector

There is only one ISA connector provided on the system board. The corresponding slot is
shared with the PCI connector (Combo slot).
In addition to this ISA slot, the following devices (refer to the section "Devices on the ISA
Bus" in this chapter for more details about devices on the ISA bus) are also connected to
the ISA bus:
• Ultra I/O (NS 97317), which integrates one parallel port, two serial ports, a keyboard
and mouse controller (8042), a floppy controller and a battery backed-up Real Time
Clock + CMOS (RTC).
Chapter 2
System Board
Accessory Board Slots
33