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2.0 Drive mounting and configuration
2.1 Handling and static-discharge precautions
After unpacking, and before installation, the drive may be exposed to
potential handling and ESD hazards. It is mandatory that you observe
standard static-discharge precautions. A grounded wrist-strap is pre-
ferred.
Handle the drive only by the sides of the head/disc assembly. Avoid
contact with the printed circuit board, all electronic components and the
interface connector. Do not apply pressure to the top cover. Always rest
the drive on a padded antistatic surface until you mount it in the host
system.
2.2 Jumper settings
2.2.1 Master/slave configuration
You must establish a master/slave relationship between two drives attached
to a single AT bus. You can configure a drive to become a master or slave
by setting the master/slave jumpers, as described below and shown in
Figure 2 on page 16.
Alternatively, you can configure the drive as a master or slave using the
cable select option. This requires a specialized daisy-chain cable that
grounds pin 28 (CSEL) on one of its two drive connectors. If you attach
the drive to the grounded CSEL connector, it becomes a master. If you
attach the drive to the ungrounded CSEL connector, it becomes a slave.
To use this option, the host system and both drives must support cable
select and both drives must be configured for cable select. To configure
an ST9816AG for cable select, install both master/slave jumpers.
For the host to recognize the slave drive using the DASP– signal, the
slave drive must assert the DASP– signal at power up, and the master
drive must monitor DASP– at power up.
Marathon 810 (ST9816AG) Product Manual, August 1995 15