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18 SKA4 Baseboard Product Guide
Peripherals
Super I/O Chip (SIO)
The National
†
PC97317VUL Super I/O Plug and Play Compatible with ACPI Compliant
Controller/Extender device supports two serial ports, one parallel port, diskette drive, and
PS/2-compatible keyboard and mouse. The system provides the connector interface for each port.
Serial Ports
Both serial ports can be relocated. Each serial port can be set to one of four different COMx ports,
and each can be enabled separately. When disabled, serial port interrupts are available to add-in
boards.
Parallel Port
The SKA4 baseboard provides a 25-pin Parallel Port connector. The SIO provides an IEEE
1284-compliant 25-pin bi-directional parallel port. BIOS programming of the SIO registers enable
the parallel port, and determine the port address and interrupt. When disabled, the interrupt is
available to add-in cards.
Add-in Board Slots
The baseboard has eight slots for PCI add-in boards supported by three PCI bus segments called
PCI-A, PCI-B, and PCI-C. There are two on PCI-A, four on PCI-B, and two on PCI-C. PCI-C
supports half-length boards (5.6" to 6.3") only; the other slots support full-length boards.
The two slots for the PCI bus segment PCI-C consume a maximum of 375 mA of standby current
on a 3.3V AUX power line. The remaining six slots do not have any 3.3V Aux capabilities.
Both PCI segments A and B allow you to add, remove, or replace PCI add-in boards installed in
their slots without interrupting normal operation or powering down the system. To use this PCI
Hot-Plug (PHP) feature, a server system requires PCI Hot-Plug software and PCI Hot-Plug capable
add-in boards. PCI Hot-Plug software usually is a driver loaded for a specific operating system.
Each Hot-Plug PCI slot has two LEDs. The green LED indicates the state of power on each slot.
The amber LED indicates an error condition with that slot.