jumper definitions  : mounting guide  : specifications  : marketing guide

Jumper Settings
The following describes the jumper options and settings available on the Atlas-III disk drive. For more detail on jumper definitions; please refer to the jumper definition section.


Termination Power (TP)

Enable termination power	Jumper across pins 35-36 *
Disable termination power	No jumper across pins 35-36

SCSI ID (A3, A2, A1, A0)

Set drive SCSI ID	See ID settings table below

Spin Up

Enable spin up	Jumper across pins 11-12 *
Disable spin up	No jumper across pins 11-12

Write Protect

Write Protection	Jumper across pins 19-20
Write Enable	No jumper across pins 19-20 *

Stagger Spin

Enable stagger spin	Jumper across pins 21-22
Disable stagger spin	No jumper across pins 21-22 *

Enable Narrow

Enable Narrow	Jumper across pins 23-24
Disable Narrow	No jumper across pins 23-24 *

Disable Synchronous Negotiation

Enable SyncReq	No jumper across pins 25-26 *
Disable SyncReq	Jumper across pins 25-26

Disable Parity

Enable Parity	No jumper across pins 27-28 *
Disable Parity	Jumper across pins 27-28

Disable Attention

Enable Attention	No jumper across pins 29-30 *
Disable Attention	Jumper across pins 29-30

Termination Note

The Quantum Atlas III wide disk drive is manufactured as an Ultra2 Multi-Mode LVD device only. This drive does not provide for onboard SCSI bus termination. Refer to your system or SCSI controller documentation regarding recommendations on SCSI bus termination.

* Indicates default jumper setting


Jumper Locations
The Atlas III wide disk drive has two locations where user configurable jumpers are found. The primary jumper block (Front option connector J3) for the Atlas III wide drive is found on the front edge of the disk drive printed circuit board. Using these jumper pins you can establish the various drive configuration options. The secondary option jumper block provides an alternate method for setting primary drive features. The alternate jumper block is located at the rear of the drive and is incorporated into the SCSI cable connector.

Pin	Signal	Pin	Signal
1	A3	2	logic_gnd
3	A2	4	logic_gnd
5	A1	6	logic_gnd
7	A0	8	logic_gnd
9	Key (blank)	10	Fault LED
11	Spin Up	12	logic_gnd
13	logic_gnd	14	Reserved
15	Reserved	16	Reserved
17	Busy LED	18	+5 volts
19	Write Protect	20	logic_gnd
21	Stagger Spin	22	logic_gnd
23	Enable Narrow	24	logic_gnd
25	Disable SyncNeg	26	logic_gnd
27	Disable Parity	28	logic_gnd
29	Disable Attention	30	logic_gnd
31	Customize	32	logic_gnd
33	No pins	34	No pins
35	Term Power	36	Term Power

Pin	Signal	Pin	Signal
1	A0	2	Fault LED
3	A1	4	logic_gnd
5	A2	6	logic_gnd
7	A3	8	Busy LED
9	Reserved	10	logic_gnd
11	+5VDC out	12	No connect

SCSI ID Settings
The following table identifies the various SCSI ID values and the jumper positions required to set them.

Drive ID	A0 (Pins 7-8)	A1 (Pins 5-6)	A2 (Pins 3-4)	A3 (Pins 1-2)
ID 0	OFF	OFF	OFF	OFF
ID 1	ON	OFF	OFF	OFF
ID 2	OFF	ON	OFF	OFF
ID 3	ON	ON	OFF	OFF
ID 4	OFF	OFF	ON	OFF
ID 5	ON	OFF	ON	OFF
ID 6	OFF	ON	ON	OFF
ID 7	ON	ON	ON	OFF
ID 8	OFF	OFF	OFF	ON
ID 9	ON	OFF	OFF	ON
ID 10	OFF	ON	OFF	ON
ID 11	ON	ON	OFF	ON
ID 12	OFF	OFF	ON	ON
ID 13	ON	OFF	ON	ON
ID 14	OFF	ON	ON	ON
ID 15	ON	ON	ON	ON