Chapter 3 System Boards; Main Board - Acer AcerAltos 21000 System Manual

Chapter 3
The system boards consist of the main board, the memory board, the
SCSI backplane board, and the LCD display module. This chapter
discusses the system board configurations in detail.
3.1

Main Board

The main board has the following major components:
Four Slot 2 CPU (Central Processing Unit) connectors that
support one, two, three, or four Intel Pentium II Xeon processors
and the next generation of Pentium processors:
Intel Pentium II Xeon running at 400 with integrated 512K
and 1MB L2 write-back cache
Intel Pentium II Xeon running at 450 with integrated 512K,
1MB, and 2MB L2 write-back cache
One VRM (Voltage Regulator Module) for each CPU and
one VRM for the L2 cache of two CPUs
256-KB Flash ROM for system BIOS
Supports two PCI buses through one PXB (PCI Expander Bridge)
System clock/calendar with battery backup
One 68-pin Wide SCSI connector for each SCSI channel
One narrow SCSI connector for connecting legacy SCSI
devices, such as SCSI CD-ROM, DAT drives, etc.
Server management functions
PCI SVGA on-board, supports up to 1024 x 768 resolution
Onboard 2MB VGA RAM
Enhanced IDE hard disk and diskette drive interfaces
PCI local bus IDE (Integrated Device Electronics) controller
System Boards
System Boards
3-1