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INSTALLATION GUIDE

WDAT-140 Adapter Board
for
Intelligent Storage Peripherals and Integrated Drives

Radio Frequency Interference Statement

This Western Digital product has been verified to comply with the limits for a
Class B computing device pursuant to subpart J of Part 15 of FCC rules. This
does not guarantee that interference will not occur in individual
installations. Western Digital is not responsible for any television, radio, or
other interference caused by unauthorized modifications of this product.

If interference problems do occur, please consult the system equipment owner's
manual for suggestions. Some of these suggestions include relocation of the
computer system away from the television or radio or placing the computer AC
power connection on a different circuit or outlet.

This digital apparatus does not exceed the Class B limits for radio noise
emissions from digital apparatus set out in the Radio Interference Regulations
of the Canadian Department of Communications.

Trademarks used in this text: IBM and AT are
registered trademarks of International Business Machines Corporation.

**************************************************************************
INTRODUCTION
**************************************************************************

The WDAT-140 is a printed circuit board that connects an IBM AT or compatible
computer to an intelligent storage peripheralor an integrated hard disk drive.
The WDAT-140 adapter board can be used with either the Western Digital
intelligent storage peripherals or other manufacturers integrated disk drives.

You can attach two disk drives in a daisy chain cable configuration to your
computer system provided the intelligent storage peripherals or integrated
drives themselves are designed for a daisy chain configuration. Look in your
manufacturer's manual to determine whether your intelligent storage peripherals
or integrated drives allow daisy chain configurations.

This document describes installation of the WDAT-140 in the IBM AT-computer and
compatibles.

**************************************************************************
UNPACKING THE ADAPTER BOARD
**************************************************************************

CAUTION

Hold the adapter board by the ends. Static electrical
discharge can permanently damage components if the board is
not carefully handled.













Remove the board from its anti-static pouch and inspect it for any visible
signs of damage (scratches, loose components, broken connectors). Contact the
dealer if there is damage.

Retain any packing materials for reuse if it becomes necessary to return your
WDAT-140 board.


1

SOME PRELIMINARY STEPS

Before you begin the actual installation of the hardware, there are some
preliminary steps that you need to do.

**************************************************************************
GATHER SUPPLIES
**************************************************************************

The installation requires that you gather the following tools and supplies.

screwdriver

AT-compatible computer with space to hold the internal device(s)

intelligent storage peripheral(s) or integrated hard disk
drive(s)

interface cables

installation manual for AT-compatible computer

installation manual for intelligent storage peripheral(s)
or integrated hard disk drive(s)

**************************************************************************
IDENTIFY COMPONENTS
**************************************************************************

The WDAT-140 board works with Winchester hard disk drives that have the AT
intelligent storage peripheral or integrated drive interface.

Look in your drive manuals to verify that you have an AT intelligent storage
peripheral or integrated hard drive or check with your dealer.

This board does not work with XT drives. If you have an XT drive you need the
WDXT-140 board.

Components

You should have the following items and be able to identify them

intelligent storage peripherals or integrated drives (1 or 2)













cable for intelligent storage peripheral or integrated drive
(40 pin in daisy chain configuration)

You need to know the types of components that you plan to connect to your
adapter board because some settings depend on the types of components attached
to it.


J2 Hard
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³ ÚÄÄÄÄÄ40 PinÄÄÄÄÄÄÄÄ¿ ³
³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³
³ ù ù W1 ³
³ ù ù ³
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P2 P1

**************************************************************************
IDENTIFY BOARD
**************************************************************************

Figure 1-1 shows the connector location ( J2) on the WDAT-140 board
and the location of the jumper block (W1).

Look at your board and locate the connector and jumper block. Familiarize
yourself with these locations. Note the connector and jumper names
are also marked on the board itself.

CAUTION
Handle the adapter board by the ends of the board. Some of the
chips are static sensitive and damage may occur if the board is
incorrectly handled.




















**************************************************************************
JUMPERS
**************************************************************************

A jumper block and a jumper plug combination, together, when installed or
removed between a pair of pin locations on a board, turn certain functions on
or off. These functions define the peripheral hardware to your computer.

Western Digital set the jumper combinations for the most common applications.
It is unlikely that you will need to change the jumper settings.

Jumper Settings

The WDAT-140 board contains one jumper block, W1, which defines the hardware
delay time to the intelligent storage peripheral or integrated hard disk. By
moving the jumper plugs, you can change the delay time to your intelligent
storage peripheral or integrated hard disk.

Jumper settings are listed in Appendix B Table B-1. The factory default
settings are identified with the "*" symbols.

Standard Jumper Settings (W1)

The factory default jumper settings is how Western Digital defines the hardware
attached to the WD140-AT board. This setting is shown below.

. W1 with pins 3 and 4 connected passes the hardware interrupt
(DIRQ14) value for the hard disk without delay to your computer

Do I Need To Change Any Jumpers?

No. Do NOT change any jumper settings on your WDAT-140 board,
unless you have the following:

. You want to delay the hardware interrupt (DIRQ14) signal.

See Appendix B for information on changing jumpers.

**************************************************************************
CHANGE JUMPER SETTINGS
**************************************************************************

Only change the jumper setting for your WDAT-140 board, if you want to delay
the hardware interrupt (DIRQ14) signal. In all other cases, do NOT change the
jumper settings.

If you need to change the jumper settings, you should do this before you
install the WDAT-140 board into your computer. You change the jumper settings
by adding or removing the tiny jumper plugs on the WDAT-140 board.

Go to Appendix B for exact instructions BEFORE you change the jumper settings.
If you do not need to change jumpers, you can proceed to Chapter 2.















2

HOW TO INSTALL YOUR HARDWARE

Before you begin the actual installation of the WDAT-140 hardware, you need to
prepare and install your intelligent storage peripherals or integrated drives.
Steps 1 and 2 below refer to these procedures.

Important

Before you install the WDAT-140 board, determine whether
you plan to change the W1 jumpers. Change any jumpers before
you install the board.


1. Turn your computer power switch OFF and unplug the power
cord. Then remove the computer cover. See manufacturer's manual
for details.


2. Look in your intelligent storage peripheral or integrated drive manual and
follow the steps to configure and to install your intelligent storage
peripheral(s) or integrated drive(s). These steps include setting the
drive number and termination resistor, attaching the cable(s) to each
drive, and mounting the drive(s) into the computer case. Be sure that you
attach your drive(s) to a power source. If you have two drives, know which
drive is set as the first drive and which is set as the second drive.

Since the WDAT-140 board has only one integrated drive connector, you must
daisy chain your intelligent storage peripherals or integrated drives.


3. Connect the interface cable 40 pin connector from the intelligent storage
peripheral or integrated drive to J2 on the WDAT-140 board. Attach Pin 1
of the cable connector to Pin 1 on the adapter board. See Figure 2-1.

Pin 1 of the cable connector is marked and is on the
color coded edge of the cable. Pin 20 on the WDAT-140 board is keyed.
Do NOT force the cables and connectors.


























³ ³ ³ ³ ³ Cable from Integrated Drive or
³ ³ ³ ³ ³ ³ ³ ³ ³ ³ Integrated Storage Peripheral
³ ³ ³ ³ ³ ³ ³ ³ ³ ³
³ ³ ³ ³ ³ ³ ³ ³ ³ ³
*ooooooooooooooooooo
[email protected] x=Pin 20
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³ *=Pin 1 ooooooooooxooooooooo ³
³ *[email protected] @=Pin 40 ³
³ J2 (Hard) ³
³ ³
³ ³
³ ³
³ ³
³ ³
³ ³
³ ³
³ ³
³ ³
³ ³
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P2 P1

Figure 2-1. Connect Pin 1 to Pin 1

4. After you have installed the intelligent storage peripheral(s) or
integrated drive(s) into the computer case, secured them in place, and
attached the cables, look and see which expansion slots are empty. Use an
empty expansion slot which is as close to the intelligent storage
peripheral(s) or integrated drive(s) as possible.


5. Loosen the screw holding the cover of the expansion slot, which you
selected in step 4. The screw is located at the rear. Remove the slot
cover screw, but do not remove the expansion slot cover.

Your WDAT-140 board should have a plastic clip attached. If the clip is
not attached to the board, locate the clip and gently push it onto the
upper right-hand corner of the WDAT-140 board. See Figure 2-2.

If your WDAT-140 board has a metal bracket instead of a clip, remove the
expansion slot cover. The metal bracket replaces the slot cover and
plastic clip combination referred to here and in step 7.


6. Hold the WDAT-140 board by the top corners and slide it into the expansion
slot. The WDAT-140's edge connectors fit into the computer's motherboard
expansion slot. Press on the board as you insert it into the expansion
slot. Check that the board is seated properly by pressing down firmly on
both ends of the board.















7. After the board is seated firmly in the expansion slot socket, secure the
board using the plastic clip that is on the end of your board. Place the
screw over the clip and slot cover. Then screw the clip and slot cover to
the computer case.


8. Replace the computer cover. Make sure that cables are out of the way and
not caught between the cover and boards. Check that the cables do not
obstruct the air flow path from the fan or vents.


9. Plug the power cord back into your computer and turn the power switch ON.

Your hardware installation is complete.


4

HOW TO HANDLE PROBLEMS

If you had a problem with your system, first re-read the instructions to be
sure that you followed them correctly. Check that you typed information EXACTLY
as instructed.

Repeat the procedure a second time to verify that you get the same error, then
check the next section, "If You Have a Problem."

If You Have a Problem

First check your physical installation. Check for reversed cables, an
overloaded system power supply, incorrect drive selection, etc.

CAUTION

Turn the power OFF before you open the computer case and attempt to
reverse the cables, etc. Always use your park utility.


This section lists some common problems and possible solutions to try if you
have problems when you install your adapter board.

PROBLEM: Winchester activity LED on front of drive is always on.

SOLUTION: Check cable connections. Check that pin 1 is connected to
pin 1 and, if not, reverse connection. Replace cables. Check whether
the intelligent storage peripheral or integrated drive has
malfunctioned.

PROBLEM: "Error Reading Fixed Disk" when starting the system.

SOLUTION: DOS partition not active. See FDISK instructions in your DOS
manual.














PROBLEM: Error code "40" or "20" appears on screen.

SOLUTION: Check cable connections. Check that pin 1 is connected to
pin 1 and, if not, reverse connection. Replace cables. Check
whether the intelligent storage peripheral or integrated drive
has malfunctioned.

PROBLEM: After you do a high level DOS format (Format C:/S), the message
"Insert disk and press ENTER." appears. The system thinks drive C
is a floppy disk drive.

SOLUTION: Computer motherboard switches are set for the incorrect number
of floppy disk drives. Check to see if RAM disk drivers are present.

PROBLEM: System hangs during multiple sector read or write. DIRQ14
signal needs to be delayed until ACTIVE signal goes high.

SOLUTION: Check that jumper W1 set to delay DIRQ14. Pin 1 is connected
to pin 2 and pins 3 and 4 are open (not connected). This is the
opposite of the Western Digital default. See Appendix B.

PROBLEM: None of the suggestions seem to help.

SOLUTION: Call your dealer.


A

JUMPERS

The WDAT-140 board has a jumper block at W1. Adding or removing a jumper
shorting plug at any of the pins located at W1, defines a hardware
configuration which is different from the default value selected by Western
Digital.

Jumper Functions (W1)

The jumper functions at jumper block W1 set the hardware delay time (DIRQ14)
value for the hard disk. When the pins 3 and 4 are connected, the DIRQ14 signal
is passed through to the host computer without a delay. When the pins 1 and 2
are connected, the DIRQ14 signal is held (delayed) until the ACTIVE signal goes
high.

The Western Digital factory default settings for the W1 jumper is to connect
pins 3 and 4. This means that your board came from the factory set so that the
DIRQ14 signal is passed through to the host computer without a delay.

Delay Hardware Time DIRQ14 (W1)

Most hard disks do not require that you delay the DIRQ14. Thus Western Digital
set this value so that the DIRQ14 signal is passed through to the host computer
without a delay.














However, some hard disks do require you to delay the DIRQ14 signal until the
ACTIVE signal goes high. Your hardware manufacturer should tell you when this
is necessary. See your intelligent storage peripheral or integrated hard disk
drive manual.

If you do set up your system without changing the DIRQ14 delay time and your
intelligent storage peripheral or integrated hard disk requires a delay time,
then your system will hang during a multiple sector read or write.

If your system hangs during a multiple sector read or write, check that jumper
W1 is set to delay DIRQ14. Pin 1 should be connected to pin 2 and pins 3 and 4
should be open (not connected). This is the opposite of the Western Digital
default. See following sections in Appendix B.

**************************************************************************
JUMPER SETTINGS
**************************************************************************

The WDAT-140 board contains one jumper block, W1, which defines the hardware
delay signal to the hard disk drive attached to your computer. Table B-1 lists
the settings possible. The factory default setting is identified with "*"
symbol.
PIN 1 PIN 2
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ CLOSED (Jumper Installed) Pins
³ O O ³ connected (jumpered) plug bar in
W1 ³ ³ ³ place.
³ O O ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ OPEN Jumper NOT installed
Closed Open


This set of jumpers selects to delay DIRQ14 until the ACTIVE signal goes high.

Figure A-1. Close and Open Jumper Settings


Pins Status Function

1-2 closed DIRQ14 enabled when active signal is false,
delays DIRQ til ACTIVE goes high

1-2 open** DIRQ14 passed through to host bus, no delay

3-4 closed** DIRQ14 passed through to host bus, no delay

3-4 open DIRQ14 delays DIRQ til ACTIVE goes high

**Default setting values
1-2 (closed) indicates pin 1 connected (jumpered) to pin 2.
1-2 (open) indicates pin 1 not connected to pin 2.

















**************************************************************************
HOW TO CHANGE JUMPERS
**************************************************************************

To change a jumper, you need to either add or remove a tiny jumper plug or bar.
The jumper plugs or bars necessary for the default values are supplied by
Western Digital and are already installed on the board.

First determine if you need to change the W1 jumper settings. Table B-1 lists
the definitions for each jumper setting in jumper block W1. Look at Table B-1.
Then change the setting according to the values listed in the table. See the
example for exact details.

EXAMPLE

From the information in Chapter 1 and by looking at Table B-1, you see that the
WDAT-140 board is not set for DIRQ14 delay until the signal ACTIVE goes high.
If you want to set your system so that DIRQ14 is delayed until the signal
ACTIVE , then you will have to change the WDAT-140 board's W1 jumper.

You also see from Table B-1 that the default value for the W1 jumper block is
with pins 1 and 2 (open) not connected and the new value (DIRQ14 delay until
ACTIVE ) will have the W1 jumper block with pins 1and 2 (closed) connected and
pins 3 and 4 (open) not connected.

To change the jumper setting from the default value at W1 with pins 1 and 2
(open), you take the jumper plug from pins 3 and 4 (closed) and place the
jumper plug across the W1 jumper block so that pins 1 and 2 (closed) are
connected and pins 3 and 4 (open) are not connected.

This changes the WDAT-140 board's so that DIRQ14 is delayed until
the signal ACTIVE goes high.


COPYRIGHT 1989 WESTERN DIGITAL CORPORATION
ALL RIGHTS RESERVED

INFORMATION FURNISHED BY WESTERN DIGITAL CORPORATION IS BELIEVED TO BE
ACCURATE. HOWEVER, NO RESPONSIBILITY IS ASSUMED BY WESTERN DIGITAL CORPORATION
FOR ITS USE; NOR FOR ANY INFRINGEMENT OF PATENTS OR OTHER RIGHTS OF THIRD
PARTIES WHICH MAY RESULT FROM ITS USE. NO LICENSE IS GRANTED BY IMPLICATION OR
OTHERWISE UNDER ANY PATENT OR PATENT RIGHTS OF WESTERN DIGITAL CORPORATION.
WESTERN DIGITAL CORPORATION RESERVES THE RIGHT TO CHANGE SPECIFICATIONS AT ANY
TIME WITHOUT NOTICE.

Doc. No. 79-000403

Western Digital
8105 Irvine Center Drive
Irvine, CA 92718
(714) 932-5000
Technical Support (800) 832-4778
Bulletin Board Support (714) 753-1234