Data General AViiON 5000 Series, Customer Documentation

Page: 68 / 210

Configuring VME Option Boards
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014–001867
Determining the Board’s Current Orientation
If you received your VSA board factory-installed in your AViiON

computer, it
should be configured as you need it. The board has a tag attached to one of its
handles, on which the orientation of the ports is labeled at the factory (see Figure
2–13). Each SCSI port will be labeled S.E. (for single-ended) or DIFF (for
differential), so you will not have to remove the VSA board to determine the
orientation of the daughter boards.
Board components
Figure 2–13 Labeled SCSI Ports
NOTE: Figure 2–13 is accurate only for customer-installable AViiON systems with
no more than two 6U VME option slots. The instructions in this manual
that deal with installing and/or removing the VSA board do not apply to
systems in which the VSA board mounts in a 6U-to-9U adapter before
installation.
If you must install the VSA board yourself, or if the daughter boards are not
oriented the way you need them, you will have to position the daughter boards and
fill in the label yourself. Each daughter board has the abbreviations S.E. and DIFF
silk-screened onto opposite corners. The corner that is adjacent to the SCSI
connector shows which way the board is oriented. For example, Figure 2–14 shows
one daughter board positioned for single-ended operation and one positioned for
differential.