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Notes for Figure 10.1-1a, 10.1-1b, 10.1-1c:
[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J1-Auxiliary and
J6 are given below in left to right order of jumper position. The term "default" means as standard OEM units
are configured when shipped from factory. "Off" means no jumper is installed; "On" means a jumper is
installed. Off or on underlined is factory default condition.
[2] The PCB on "WC/DC" models does not have connector J1-Auxiliary. It has a single 80 pin combined SCSI
I/O and DC power connector (J1) instead of the 68 pin SCSI I/O and 4 pin DC power connectors. Included
among the 80 pins are the SCSI ID, Motor Start and Delayed Motor Start select functions, and the remote
drive activity LED signal. Do not use J6 for these four functions if the host uses the ones included in the
80 pin J1 connector. See Tables 11.6.3-1b and 11.6.3-1d for a list of pin numbers vs. signals for the 80
pin connector. The J1-Auxiliary and J6 connector signals conform to SFF-8009 Revision 2.0, Unitized
Connector for Cabled Drives, signal assignments for auxiliary connectors. (see note [4]). ENTERM– and
FAULT– are not connected.
[3] "WD", "WC" and "DC" models do not have terminators on the drive PCB, so this jumper is not applicable
for those models.
[4] Jumper header J6 can be used in one of five possible ways:
1.Do not use J6 at all , but instead use the same functions conveyed on lines in the 80 pin I/O J1 connector
("WC/DC" models), or for "W" and "WD" models, use J1-Auxiliary (see note [2] above).
2.Use jumpers on J6 only to establish drive ID on the SCSI bus. Do not use both J6 and J1 or J1-
Auxiliary signals to establish the drive ID. The drive activity LED signal in connector J1 or J1-Auxiliary
may be used to convey that signal to/from the host.
3.Install a connector/cable on J6 for remote drive ID switching . Do not use both J6 and J1 signals to
establish the drive ID. The drive activity LED signal in the 80 pin J1 I/O connector or J1-Auxiliary can be
used in this situation, or see option 5 below.
4.Install a connector/cable on J6 for remote Drive Activity LED. Use the 80 pin I/O connector J1 for
the drive ID signals ("WC/DC" models) or J1-Auxiliary ("W" and "WD" models).
5.Install a connector/cable on J6 for all (remote ID switching and remote drive activity LED). Do not use
both J6 and J1 or J1-Auxiliary to establish drive ID.
The drive time-shares the drive ID with the drive activity LED function of J6 and J1-Auxiliary. The drive
reads the ID (asserted low) from J6 and J1-Auxiliary pins 1, 3, 5 and 7 of J6 for 250 ms after power-on or
drive reset. So that ID jumper plugs can be used on J6 or J1-Auxiliary, pins 2, 4, 6 and 8 are driven to ground
through a transistor for the 250 ms period. After that, the drive makes available on the J6 and J1-Auxiliary
headers pin 8 the remote drive activity LED and function the remainder of the time.
For "WC/DC" models, the drive ID signals on J1 (SCSIA1-SCSIA3) are asserted low for 250 ms as
described above for "W/WD" models.
[5] Not applicable to "WC/DC" model drives.
[6] This jumper applies to "W" and "WD" models only.
[7] These signals are also on the 80 pin J1 (see Tables 11.6.3-1b and 11.6.3-1d). If drive ID and option Select
signals on J1 are used, J2 and J6 would not be used.
[8] Reserved usage. Do not install any jumpers.
Product Manual - Hawk 4 Family (Wide) SCSI-2 (Volume 1), Rev. E
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