System information

System Configuration and Setup
6-27
6.5 PCI Bus Options
PCI (Peripheral Component Interconnect) is an industry-standard expansion I/O bus
that is the preferred bus for high-performance I/O options. The AlphaServer 800
provides three slots for 32-bit PCI options and one slot for 64-bit PCI options. A PCI
board is shown in Figure 6-5.
Figure 6-5 PCI Board
IP00075A
PCI
Install PCI boards according to the instructions supplied with the option. PCI boards
require no additional configuration procedures; the system automatically recognizes
the boards and assigns the appropriate system resources.
WARNING: For protection against fire, only modules with current-limited outputs
should be used.
6.6 SCSI Bus
The embedded SCSI controller on the motherboard:
• Supports up to seven drives.
• Provides 8-bit fast narrow SCSI support for up to three 5.25-inch internal, half-
height removable-media devices.
• Provides 16-bit fast wide SCSI support for up to four 3.5-inch, internal hard disk
drives.
NOTE: Two half-height removable-media devices can be substituted for one
5.25-inch full-height device.
For Windows NT, adding or removing drives may require rebooting the
operating system. Certain RAID controllers may permit hotswapping of
drives without deallocating drives and rebooting the operating system.