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U41290-J-Z816-3-76
CHAPTER 4 Hardware Overview
4.5
Basic I/O Board
This section describes the basic I/O board for the PRIMEPOWER900 main unit, and
provides specifications for the PCI slots mounted on the basic I/O board.
4.5.1
Overview of basic I/O board
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One basic I/O board has seven slots for short cards and one slot for a long card.
Up to two basic I/O boards can be installed in the main unit.
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As shown in
, there are two types of basic I/O board. One type is
mounted on the left side of the unit and the other is mounted on the right side of the
unit. These boards are not interchangeable.
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The basic I/O board conforms to the PCI local bus specifications (Rev. 2.1).
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The basic I/O board supports a bus width of 64 bits and clock frequencies of 33
MHz (5.0 V) and 33/66 MHz (3.3 V).
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The PCI slot supports hot replacement (PCI Hot Plug). For details, refer to
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Standard I/O features on the basic I/O board include LAN ports, SCSI ports
(dedicated ports for internal hard disk units), and serial ports (RS232C).
Note:
If an optional PCI/disk box is installed, six slots for short cards and four slots
for long cards can be added. A total of two PCI/disk boxes can be installed.
For details, see
Figure 4.6 Basic I/O board
