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PCI/I-486SP3G
User's Manual
Setting Up the PCl-SC200
There are two jumper settings you may need ·to make on the card
to set it up. One setting assigns the PC! INT interrupt, the other sets
the card's
termination.
Setting the INT Assignment
As explained in Chapter 2, any PCI card you install must have
PCI INT A assigned to it. On the PCI-SC200, you assign the INT by
setting jumper JPl or JP2. The default setting for the card is INT A
The INT assignment must be the same as the INT assigned to the PCI
-slot you install the card in, which for this mainboard is INT A
The INT assignment jumper settings are illustrated
below.
The
settings are printed on the card for your
convenience.
JP1 & 2: Interrupt settings
a : :
l
o
~
--,
C!>
0
--,
oo
·
INTA
(default)
~Iii
§
!~
INTB
O: :
[l
( j)
~
--,
0
C!> --,
00
INTC
~!§I
i
i~
INTO
Technical Summary
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Tenninator Settings
SCSI,
devices are connected together in a "chain" by cables. In-
ternal devices connect to the PCI-SC200 with a fifty-pin flat ribbon
cable. External devices connect to the external port with a SCSI-2
cable. If there is more than one internal or external device, additional
devices are connected with cables to form a "daisy chain." The SCSI
chain must be
"terminated"
at both ends, or the devices in the chain
will not work properly. Many SCSI devices use a set of three termi-
nating resistors
to/~inate
the device. The PCI-SC200 has "active"
termination that you set using jumper JPS. If you need to
t_
e rminate
the PCI-SC200, you do it by setting the jumper. The two settings, ter-
minated and
unterminated,
are shown below.
JP5: Terminator setting
LO
a.. --,
~
Termination
Enabled (default)
LO
a.. --,
~
Termination
Disabled
Decide whether you need to terminate the PCI-SC200 based on
its position in the SCSI chain. Only the devices at each end of the
chain need to be
terminated.
If
you have
only
internal or
only
exter-
nal devices connected to the PCI-SC200, then you
must
terminate the
PCI-SC200. If you have
both
internal and external devices connected,
you
must not
terminate the
card.
The figures opposite illustrate these
requirements .
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4-16
4-17
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