WD10035-RAH JUMPER SETTINGS
JUMPER
PIN CONNECTS
DESCRIPTION
W1
1-2
Standard factory setting. Status read is latched. Used for IBM Personal Computer AT
if Winchester activity LED is connected to J6.
OPEN
Status read is not latched. Activity LED turns on during drive access. W5 must be
jumpered 2 to 3. Used for Compaq hosts.
W2
OPEN
Standard factory setting. Selects primary addresses, 1F0 through 1F7 and 3F0 through
3F7 hex. Do not modify the primary address jumper unless your BIOS operating
system is configured to accept more than two hard disk drives.
1-2
Selects secondary addresses, 170 through 177 and 370 through 377 hex.
W3
Applicable to the WD1003-RAH. Eliminated by design and artwork changes to the
WD1003S-RAH.
W4
1-2
Standard factory setting. No translation for drive 0.
2-3
Enables translation for drive 0. Translation is only available for 615 cylinders and four
headed drives. In translation mode, the controller translates the 26 physical sectors per
track into 17 sectors. The extra sectors are "translated" into logical heads. To use the
translation mode, select through the Setup program a 615 cylinder and six head drive
type. (This is drive type three for IBM Personal Computer AT users. Not all AT-
compatible systems use the same drive tables as IBM.) This configuration must be
used when running an operating system or application program which requires a 17
sector per track disk drive.
W5
2-3
Standard factory setting. WG and drive select lines only enabled when drive is
accessed. This configuration also provides power up and down protection.
1-2
WG and drive select lines are disabled during power up reset and when + 5V power
supply drops below approximately +4.1 5V.
W6
1-2
Standard factory setting. No translation for drive 1.
2-3
Enables translation for drive 1. Translation is only available for 615 cylinders and four
headed drives. In translation mode, the controller translates the 26 physical sectors per
track into 17 sectors. The extra sectors are "translated" into logical heads. To use the
translation mode, select through the Setup program a 615 cylinder and six head drive
type. (This is drive type three for IBM Personal Computer AT users. Not all AT-
compatible systems use the same drive tables as IBM.) This configuration must be
used when running an operating system or application program which requires a 17
sector per track disk drive.
W7
1-2
3-4
Standard factory setting. Controller operates with daisy-chained drive(s). Both can be
daisy-chained from J1 or drive 0 can be connected to J1 and drive 1 can be connected
to J5. For daisy-chained operation, set the drive select jumpers on the first drive for
drive 0 and on the second drive for drive 1.
1-3
Controller operates with parallel connected drives. Attach drive 1 control connector to
J1.
2-4
Attach drive 0 control connector to J5. For parallel operation, set the drive select
jumpers on both drives for drive 0.
W8
1-2
Standard factory configuration. Ties input high
.
2-3
Enables seek to landing zone (cylinder 663) on any seek to a cylinder greater than
615. Used only for 615 cylinder drives. This jumper also changes step rate 0 (24 µsec)
to step rate 15 (11 µsec).
Summary of Contents for WD 1003-RA2
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