SCSI and I/O 8-59
Jumper Descriptions
Table 8-20 A3350 J2 Jumper Function Description
Jumper Jumper Function Description
TP TP
(Pins 3-4) (Pins 1-2)
Off Off No terminator power is connected to drive terminators or SCSI bus I/O pin 26.
On Off Drive supplies its own terminator power only.
Off On Drive supplies power to I/O pin 26 of SCSI bus, no power to internal termina-
tors.(Default)
On On Drive supplies terminator power to itself (internal connection) and to I/O pin 26 of
SCSI bus. This is a legal jumper setting.
TP POSITION A
On This horizontally positioned jumper across the two TP positions nearest the PCB
edge, connects terminator power from SCSI bus I/O pin 26 to the drive’s internal
termnators (for single-ended I/O only).
Off See above explanations for TP jumpers.(Default)
PE
On Parity checking and parity error reporting by the drive is enabled.(Default)
Off Drive checks parity, but does not report result of parity checking to host.
WP
On Entire drive is write-protected.
Off Drive is not write-protected.(Default)
DS ME
Off Off Spindle startes immediately after power-up.(Default)
Off On Drive spindle does not start until Start Unit command is received from the host.
On Off Spindle startup is delayed by SCSI ID times 12 seconds after power is applied, that
is, drove 0 spindle starts immediately when DC power is connected, drive 1 starts
after a 12-second delay, drive 2 after s 24-second delay, and so forth.
On On Drive spindle starts when Start Unit command is received from the host. Delayed
start feature is overridden and does not apply when the ME jumper is installed.
SS
Off Reserved jumper position. No jumper is installed.
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