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PCI-to-PCI Bridge
The DEC 21050 PCI-to-PCI bridge supports the PCI bus 2 (also known as Secondary Auxiliary),
which is bridged off PCI bus 1. PCI bus 2 includes the expansion slot 8 through 12. Refer to “PCI
Bridge” on page 65 for a description of PCI bus 0 and PCI bus 1.
Lithium Battery
The Lithium battery on the I/O expansion board provides power to the CMOS chip (which stores the
BIOS and the AMIBIOS Setup program) and real time clock. If the battery fails or if the voltage is
low, the message “Battery voltage low” displays during system startup, or the system date and time
information will not display. The battery on the MSMT330 board is not replaceable. If the battery
fails, the board must be replaced.
I/O Connector Board (MSMT328)
The I/O Connector Board plugs into the I/O Connector provided by the I/O Expansion Board. This
panel provides all the external connections required by the various components integrated into the I/O
Expansion board.
Board Layout
Video Port
Mouse Port
Keyboard
Port
SCSI
Port
Parallel
Port
Serial Ports
Flash EEPROM
(Side 2)
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