WD1002-WA2 JUMPER SETTINGS
PIN
CONNECTS
DESCRIPTION
NOTE
DO NOT MOVE PRIMARY ADDRESS JUMPERS
UNLESS YOUR OPERATING SYSTEM IS
CONFIGURED TO ACCEPT TWO HARD DISK
CONTROLLERS. CERTAIN OPERATING SYSTEMS
SUPPORT TWO CONTROLLERS IN THE SAME
SYSTEM. IBM DOS AND MANY IBM-COMPATIBLE
OPERATING SYSTEMS DO NOT SUPPORT THIS
FEATURE.
E2 to E3
Standard factory setting. Selects primary address 3F2,
3F4/3F7 hex for the floppy disk drives.
E5 to E6
Standard factory setting. Selects primary addresses 1FO
hex through lF7 hex, and 3F6 hex and 3F7 hex for the
Winchester diskdrives.
El to E2
Selects secondary addresses 372, 374/377 hex for the
floppy disk drives.
E4 to E5
Selects secondary addresses 170 hex through I 77 hex and
376 hex and 377 hex for the Winchester disk drives.
E7 to E8
Jumper must he installed at all times. DO NOT
REMOVE.
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WD1003-WA2 JUMPER SETTINGS
JUMPER
POSITION
FUNCTION
W1
No jumper
Status Read is non-latched. Dynamic drive select; i.e..
SELECT = DRIVE BUSY. Used for Compaq 286s.
Jumper
Standard factory setting. Status read is latched. Static
drive select (SELECT asserted except during RESET).
Used for IBM Personal Computer ATs.
NOTE
Do NOT MOVE PRIMARY ADDRESS JUMPERS
UNLESS YOUR OPERATING SYSTEM IS
CONFIGURED TO ACCEPT TWO HARD DISK
CONTROLLERS. CERTAIN OPERATING
SYSTEMS SUPPORT TWO CONTROLLERS IN
THE SAME SYSTEM. IBM DOS AND MANY IBM
COMPATIBLE OPERATING SYSTEMS DO NOT
SUPPORT THIS FEATURE
W2
No Jumper
Standard factory setting. Primary addresses selected.
Jumper
Secondary addresses selected.
W3
No jumper
This configuration used with WD1lC00A-22 or when
W5, pins 2 and 3 are jumpered.
Jumper
Required only on early units with WD11C00-22 and
W5. pins 1-2 jumpered. DO NOT JUMPER WITH
WD11C00A-22 INSTALLED.
W4
Jumper 2-3
Standard factory setting. Ties firmware sense bit input
high
Jumper 1-2
Supports 2 head. 612 cylinder second drive with
standard system setup for 4 head. 306 cylinder drive.
W5
Jumper 2-3
Standard factory setting.
Jumper 1-2
Internal signal of Power-up circuit controls WG enable.
W6
Jumper 2-3
Standard factory setting. Ties input high.
Jumper 1-2
Ties input low. The 35 µsec step rate cannot be selected
with W6 in this position. Instead, the 16 µsec step rate is
selected.
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