System Overview 1-21
Network Controller
The system board includes a 10BASE-T/100BASE-TX network controller based on the
Intel 82559 Fast Ethernet PCI Bus Controller. As a PCI bus master, the controller can
burst data at up to 132 MB/sec. The controller contains two receive and transmit FIFO
buffers that prevent data overruns or underruns while waiting for access to the PCI bus.
The controller has the following:
! 32-bit PCI bus master interface (direct drive of bus), compatible with PCI Bus
Specification, Revision 2.1
! Chained memory structure with improved dynamic transmit chaining for
enhanced performance
! Programmable transmit threshold for improved bus utilization
! Early receive interrupt for concurrent processing of receive data
! On-chip counters for network management
! Autodetect and autoswitching for 10 or 100 Mbps network speeds
! Support for both 10 Mbps and 100 Mbps networks, capable of full or half
duplex, with back-to-back transmit at 100 Mbps
! Support for Wake On LAN.
SCSI Controller
The system I/O board includes an embedded Adaptec AIC7899 dual function SCSI
controller. The AIC7899 provides two Ultra 160/m SCSI interfaces as two independent
SCSI functions. As implemented on the system I/O board, channel A has one
connection to the external connector on the rear of the chassis and another connection to
the 5.25-inch devices in the removable media bays. Channel B is connected to the SCSI
backpanel that supports up to two Ultra 160/m SCA drives unless the optional RAID
controller is installed.
Video Controller
The system has an integrated ATI Rage IIC 64 bit high-performance SVGA subsystem
that supports the following:
! BIOS compatibility with VGA, EGA, CGA, Hercules Graphics, and MDA
! 4 MB of 10 ns onboard Synchronous Graphics Memory (SGRAM)
! Pixel resolutions up to 1280 X 1024
! Analog VGA monitors (single and multiple frequency, interlaced and
noninterlaced) with a maximum vertical retrace noninterlaced frequency of
100 Hz.