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Decathlon 850 ATA Product Manual, July 1995
17
2.4 Options jumper block (J8)
The ST5850A is manually configured using the options jumper block (J8)
shown in Figure 3 on page 18 for Type A drives and in Figure 5 on page
20 for Type B drives. The Type A options jumper block is a 12-pin header.
The Type B options jumper block is a 34-pin header. The options jumper
block allows you to:
• Install two drives on the hard disc controller.
• Install the drive using dual-drive emulation.
• Install a remote LED.
• Install the drive in systems that support cable select.
2.4.1 Spare jumpers
The factory ships the drives with spare jumpers attached to the options
jumper block (J8). The locations of spares are shown in Figure 4 on page
19 for Type A drives and Figure 6 for Type B drives. Use these jumpers
to configure your drive. The jumper block is designed to accept 2-mm
connectors. If you need additional jumpers, order Seagate part number
13211-001 or an equivalent.
2.4.2 Master/slave configuration
Pins 1 and 2 and pins 3 and 4 are used to configure the drive as a master
or a slave.
One drive only. No jumpers are used.
Drive as master. Use this setting if the drive is the master.
Drive as slave. Use this setting if the drive is the slave.
2.4.3 Master/slave timing protocol
This protocol involves the communication between the host and the disc
drives during the boot up cycle. The host queries the master for the status
of both drives. The slave must signal the master within a certain time
period or the master reports that the slave has failed and the host won't
recognize it. The ST5850A is shipped configured to work with other
drives that use the standard ATA master/slave timing protocol.
Some drives use the signal differently. This setting allows the Seagate
drive to communicate with those drives as the slave only. Try using this
setting if the slave is not identified after power-on.
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