WDl003-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
OPEN
1-2
This configuration used with WD11C00C-22 at board location US
or if W5 is jumpered 1 to 2. Required only on early units with
WD11C00-22 at board location U8 and W5 is jumpered 1 to 2. DO
NOT JUMPER WITH THE WDl1C00C-22 INSTALLED.
W4
2-3
Standard factory setting. No translation for drive 0.
1-2
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
2-3
Standard factory setting. No translation for drive 1.
1-2
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.
Содержание WD 1003-RA2
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