7
Multiple Host Adapters
■ Multiple SCSI host adapters can be installed in your
computer; you are limited only by available system
resources (e.g., I/O port and BIOS addresses).
■ Each host adapter you install forms a separate SCSI
bus with a different set of SCSI devices. SCSI IDs can
be reused as long as the ID is assigned to a device on
a different host adapter (e.g., each host adapter can
have a device with SCSI ID 0).
Modifying PCI Parameters
You may need to change the PCI configuration parame-
ters in the computer’s setup program if
■ your system CMOS setup requires you to enable PCI
parameters.
■ your computer does not recognize the host adapter
after you install it.
■ you cannot access any of the devices.
Usually you start the setup program by pressing a speci-
fied key like Delete or F1 when your computer boots (refer
to your computer documentation). Listed below are some
things you may need to change in the setup program.
Some configuration options apply to a specific PCI bus
slot. Therefore, if you change these options, be sure you
are applying them to the slot in which the host adapter is
installed. Read your computer documentation if you are
not sure which slot corresponds to each number.
■ If there is an Interrupt Type or Interrupt Line option
in the setup program, be sure to select Int-A or
Interrupt Type = A. Depending on your computer,
you may also be required to change a motherboard
jumper setting.
■ If there is a Triggering Interrupt option, be sure to
select Level.
■ If there is an option to enable or disable individual
PCI slots, be sure to enable the slot in which the host
adapter is installed.
■ If your computer has a combination of ISA (or EISA)
boards and PCI boards, you may need to mark the
IRQs used by ISA/EISA boards as Used so the com-
puter BIOS will not try to assign these IRQs to other
PCI boards.
■ In some computers the BIOS reserves a set of avail-
able IRQs for PCI boards, and you have to assign
these IRQs manually.
Connecting to the LED Connector
(Optional) Most computers have an LED disk activity light
on the front panel. If you want the LED to light whenever
there is activity on the SCSI bus, then disconnect the cable
from the LED connector on the motherboard and connect
it to the LED connector on the host adapter (the LED will
no longer indicate non-SCSI, i.e., IDE, activity). On com-
puters with a two-position LED cable, connect the LED
cable to pins 1 and 2 of the LED connector.
LED Connector
1
LED Cable
Pin 1
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