READ THIS FIRST
INSTALLATION GUIDE
WD1004-27X
WD1004A-27X
Winchester Disk Controller Boards
FEBRUARY 1989
IDENTIFY DRIVE
The WD1004-27X and WD1004A-27X boards work with any hard disk drive that
has the ST506/412 drive interface and no more than 1024 cylinders and 16 heads.
The Seagate 238 hard disk drive unit is such a drive.
Look in your drive manual to verify that you have an ST506/412 RLL drive or
check with your dealer.
Then check the drive manual for the drive parameters, such as those listed in Table
1-1. You'll need this information to select the proper low level format.
Table 1-1. WD1004 and WD1004A Default Drive Parameters
Formatted
Capacity
32MB 4 615 26
This board does not work with RLL drives. If you have an MFM drive you
need either the WDXT–GEN2 or WD1004A–WX1 board.
Number of
Heads
Number of
Cylinders
1-2
Sectors per
Track
IDENTIFY BOARD
This document describes the installation of the two controller boards, WD100427X and WD1004A-27X. These controllers are similar functionally, except for a
few features. These boards are described below.
WD1004-27X Board
Figure 1-1 shows the connector locations (J1, J2, J3, J4, and J5) on the WD100427X board and the location of the jumpers (W17 to W22, R23, and W25 to W28).
The WD1004-27X board has a connector at J4, which allows the controller to
connect power to FileCard® drives and jumpers W17 to W22, which permit
selection of additional options. Also the WD1004-27X board can be used as a
secondary controller.
WD1004A-27X Board
Figure 1-2 shows the connector locations (J1, J2, J3, and J5) on the WD 1004A27X board and the location of the jumpers (R23, and W25 to W28). The
WD1004A-27X board cannot be used as a secondary controller.
1-3
FIGURE 1-1 WD1004-27X CONNECTOR AND JUMPER LOCATIONS
1-4
FIGURE 1-2 WD1004A-27X CONNECTOR AND JUMPER LOCATIONS
1-5
FIGURE 2-1. DAISY CHAIN CABLE CONNECTIONS
2–5
B
JUMPERS
The WD1004 board has a row of jumper pins at W17 to W22 and W25 to W28. The
WD1004A board has a row of jumper pins at W25 to W28. Adding a jumper shorting plug at
any of these locations, selects a hardware configurations that is different from the default
value selected by Western Digital.
Jumper Functions (W17 to W22, R23, and W25 to W28)
The following list explains the jumper functions.
· W17 & W18 selects factory drive tables for the first hard disk
· W19 & W20 selects factory drive tables for the second hard disk
· W21 and W22 selects the controller and BIOS address ranges
· R23 disables the Western Digital BIOS ROM on WD1004 and WD1004A
boards
· W25 and W26 set sector translation and dynamic configuration
· W27 sets the hardware interrupt (IRQ) value for the hard disk drive
· W28 allows the controller to operate with an XT computer when the jumper
†
Not available on the WD1004A-27X board.
is OUT
B–1
Default Values
Tables B-l through B-5 list the jumper settings. Default factory settings are marked with a "†" symbol.
Table B-1. Pre-selected Drive Tables
Table
Number
First Drive
W17 W18
Second Drive
W19 W20
Capacity Heads Cylinders
0 in in in in 65MB 6 820
1 out in out in 42MB 4 782
2 in out in out 21MB 2 782
†
3
out out out out 32MB 4 615
Table B-2. Select Controller and BIOS Ranges
W21 W22 Controller BIOS
out
†
out
†
320-323 C8000-C9FFF
in out 324-327 CA000-CBFFF
out in 328-32B CC000-CDFFF
in in 32C-32F CE000-CFFFF
B–2
Table B-3. Select BIOS ROM
R23 Select BIOS
in selects external BIOS
†
out
selects internal BIOS
Table B-4. Select Sectors and Configuration Option
W25 W26 Table Sectors Translate Dynamic
†
in
out RLL 17 yes no
out in RLL 26 no yes
Table B-5. Select Hardware Interrupt (IRQ)
W27 Select IRQ
in selects IRQ2
†
out
selects IRQ5
B–3
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