Product data

v When the switch is set for the 2104 Model TU3, the two-color LEDs that are related
to the 2104 Power light and to the 2104 Check light are set so that the upper LED
becomes the green Power light, and the lower LED becomes the amber Check light.
If the switch card assembly is not present when the 2104 is first switched on, or when
the 2104 receives a ‘Reset’ signal, the default logical setting for this switch is Off (that
is, for Model DU3).
SCSI Bus Split switch 9: This switch controls the SCSI bus configuration. When the
switch is set to Off, the 2104 is configured in single SCSI bus mode. When the switch is
set to On, the 2104 is configured in dual SCSI bus (split bus) mode.
If a 2104 Model DU3 is in dual SCSI bus mode and the SCSI address switch 7 is set
to Off , the SCSI addresses of one SCSI bus are 0 through 6 from left to center, and
the SCSI addresses of the other SCSI bus are 8 through 14 from center to right. If the
SCSI address switch is set to On, the SCSI addresses of one SCSI bus are 14 through
8 from left to center, and the SCSI addresses of the other SCSI bus are 6 through 0
from center to right.
If a 2104 Model TU3 is in dual SCSI bus mode and the SCSI address switch 7 is set
to Off , the SCSI addresses of one SCSI bus are 0 through 6 from bottom to center,
and the SCSI addresses of the other SCSI bus are 8 through 14 from center to top. If
the SCSI address switch is set to On, the SCSI addresses of one SCSI bus are 14
through 8 from bottom to center, and the SCSI addresses of the other SCSI bus are 6
through 0 from center to top.
If the switch card assembly is not present when the 2104 is first switched on, or when
the 2104 receives a ‘Reset’ signal, the default logical setting for this switch is Off.
Reserved 10: This switch must always be set to Off.
12 2104 Service Guide