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6.2 Before you begin
SDMS software requires an IBM PC/AT or compatible computer with
an 80486 or higher microprocessor. An understanding of basic
operating system commands is assumed. In addition, users should
have a general knowledge of the SCSI standard.
Before using the SDMS software, you should configure the Symbios
SCSI controller into your system, taking into account the
configuration of other host adapters and system resources (see Section
6.3).
Symbios recommends that you back up all data before making any
changes or installing any software, including the Symbios SCSI
controllers and software. Failure to adhere to this accepted computer
practice may lead to loss of data.
6.3 Basic rules for SCSI host adapter and
device installation
You must terminate both ends of the SCSI bus. Refer to the hardware
manuals for the devices and the host adapter to properly terminate the
bus.
Unless your system is SCSI Configured AutoMatically (SCAM)
capable, you must configure each SCSI device with a different SCSI
ID number. Refer to the hardware manuals for the devices to locate
where the jumpers of dip switches are for setting SCSI ID numbers.
Usually, the host adapter is ID 7. The devices are then set at IDs 0
through 6 (plus 8 through 15 for Wide SCSI). The bootable hard drive
must have the lowest numerical SCSI ID, unless you are able to use
the BIOS Boot Specification (BBS).
The red or blue line on a standard SCSI cable (or the black line on one
end of a multi-colored SCSI cable) designates pin one on the cable
connector and must connect to pin one on the device or host adapter
connector. Refer to Appendix C to find pin one of the connector.
Chapter 6 SCSI Setup and Configurations
61
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