4
AHA-1530P/1532P Installation Guide
Part Number: 510484-00, Rev. B
Print Spec Number: 492211-00
Current Date: 4/27/94
ECN Date: 5/3/94
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Disabling the BIOS
The AHA-1530P/1532P onboard BIOS is enabled by
default. This allows you to boot your PC from a SCSI
disk drive connected to the host adapter. It also
allows you to run the SCSISelect utility when your
PC boots, as described in Section 6. However, when
the onboard BIOS is enabled, the host adapter ’s IRQ
and other resources are fixed and cannot be reas-
signed by Plug and Play, unless the PC motherboard
BIOS supports Plug and Play.
Depending on how your PC is configured, you may
need to change the default host adapter BIOS setting.
This is controlled by switches
sw1
,
sw2
, and
sw3
on
switch block
s1
. Getting Started explains the possible
configuration scenarios.
Section 9 of this Installation Guide lists the values of
all the available switch settings.
Connecting Peripheral Devices
Assigning SCSI IDs
You can connect up to seven internal and/or external
SCSI devices to your host adapter. Each SCSI disk
drive, CD-ROM drive, or other peripheral device
must have a unique SCSI ID in the range of 0 to 6.
(The host adapter usually has ID 7.)
Some newer SCSI disk drives are SCAM-capable. The
SCAM software included with your host adapter
automatically assigns unique SCSI IDs to SCAM-
capable devices when you boot your PC.
Most SCSI peripherals currently in use, however, are
not SCAM-capable. SCSI IDs on these devices are
set with switches or jumpers and cannot be changed
by SCAM commands.
If your SCSI peripherals are not SCAM-capable, you
must be sure that each device is set to a unique SCSI
ID. See your SCSI device documentation for
instructions.
The host adapter SCSI ID can be set in the SCSISelect
utility but may be changed by SCAM. Normally, you
should leave the host adapter SCSI ID at the default
setting of 7.
5
