Data General AViiON 5500 Series, Установка, расширение и обслуживание

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7 Adding or replacing system
board options
This chapter contains instructions for adding or replacing
printed–circuit board options that attach directly to the
AViiON 5500 or 550 series system board.
Depending on its configuration, your system might include the
following system board options:
D
a second CPU complex
D
one or two Input/Output (I/O) expansion boards (SCSI and/or LAN)
D
one 8– or 24–bit graphics controller board (AViiON 550)
The “Planning a new configuration” section of Chapter 4 describes
configuration guidelines.
Adding or replacing a second CPU
This section tells how to add a CPU expansion board to an
AViiON 5500 or 550 series computer, and how to replace a failed
expansion CPU board.
NOTE: You will need these instructions to temporarily remove a
CPU expansion board if you need to replace a failed system
board.
The first AViiON 5500 and 550 series CPU complex (CPU0) is
integrated on the system board; to replace this component, you
must replace the system board (as described in Chapter 8).
The optional CPU expansion board (CPU1) attaches to an
interboard connector on the system board. The expansion CPU
board contains an additional Motorola 88110 central processing unit
and Motorola 88410 controller, plus eight static random access
memory chips (SRAMs). Figure 7–1 shows the add–on CPU complex
board used in AViiON 5500 and 550 series systems.
Figure 7–1 AViiON 5500 and 550 series expansion CPU board