AC450NX Rack Server System Product Guide
190
Extended VGA Modes (continued)
Mode(s)
in Hex
Colors
(number/
palette size) Char. x
Row Char.
Cell Resolution
Pixel
Freq.
(MHz)
Horiz.
Freq.
(KHz)
Vert.
Freq.
(Hz)
79 16M - - 1024 x 768 75 56 70
79 16M - - 1024 x 768 78.7 60 75
79 16M - - 1024 x 768 94.5 68.3 85
7C 256/256K 144 x 54 8 x 16 1152 x 864 94.5 63.9 70
7C 256/256K 144 x 54 8 x 16 1152 x 864 108 67.5 75
7D 64K - - 1152 x 864 94.5 63.9 70
7D 64K - - 1152 x 864 94.5 67.5 75
* Interlac ed Mode. ‡ 32K Direc t-Color/256-Color Mi xed Mode.

Symbios 53C896 SCSI Controller

A Symbios 53C896 LVDS SCSI controller provides embedded SCSI on the primary 32-bit PCI
bus. The configuration registers define PCI-related parameters for the 53C896 device. The
53C896 supports all mandatory registers in the PCI configuration space header, including the
vendor ID, device ID, class code, revision ID, header type, and command and status fields.
The 53C896 supports two LVDS channels. One channel controls slow devices such as CD-ROMs,
and DVDs; the other channel provides a high speed connection to the internal LVDS drives or an
external disk array.

IDE Controller

The PIIX4 multifunction device on the PHP I/O baseboard acts as a PCI-based Fast IDE controller
that supports:
• PIO and IDE DMA/bus master operations
• Mode 4 timings
• transfer rates up to 33 MB/sec
• buffering for PCI/IDE burst transfers
• master/slave IDE mode

Serv er Mana gement ( SM)

During normal operation, SM receives information about the status of the server. SM also
monitors the power supply voltages and operating temperature of the server. If SM determines
that the server is not operating within specified limits, it attempts to notify a supervisor or an
administrator about the condition of the server. The microcontrollers on the front panel board, disk
backplane, and PHP I/O baseboard implement the server management features.