Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
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J5
Jumper
Installation
Jumper Function Description
1, 2, 3
Drive ID on SCSI Bus (J6 may be used instead). The drive ID is binary coded position-
*(A2,A1,A0)
wise i.e., jumper in position A2 is drive ID 4, in position A1 is ID 2, position A0 is ID 1 and
**(A0,A1,A2)
no jumpers is ID 0. Default is ID = 0.
J5 does not exist on "NC" model drives. The drive ID signals are in the 80 pin I/O connector
and on J6.
J6
Jumper
Installation
Jumper Function Description
1, 2, 3
Drive ID on SCSI bus. Either J5 or J6 (optional) may be used to select
(A2,A1,A0)
drive ID. Both should not be used at the same time, because at some future time when the
ID is changed the user could fail to configure both J5 and J6 the same. On "NC" model
drives, drive ID signals are also included in the 80 pin I/O connector.
SSP
No jumper ever installed. Used only as a cable connection for the reference index signal
() (J6 Pin 6, bottom) for sync spindle feature. J6 pin 5 is GRD. See paragraphs
10.2, 5.7 for description of synchronized spindle operation.
LED
No jumper ever installed. These pins used to connect a cable for a remote LED indicator.
Pin 3 (top, nearest HDA), the anode connection, connects in the drive to the +5V supply
through a pull-up resistor. Pin 4 (bottom), the cathode connection connects in the drive to
signal common through the emitter-collector junction of a transistor switch that controls the
LED on/off condition.
RES
Reserved position. No jumper to be installed.
*
Address jumper position significance for old PCB’s, P/N’s 75782395 and 75782485
(Figure 10.1-1a).
**
Address jumper position significance for newer PCB’s (Figure 10.1-1b).
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