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1991-05-17
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Western Digital is a registered trademark of Western Digital
Corporation; IBM PC, AT and XT are registered trademarks of the
International Business Machines Corporation; MS DOS, OS2 and PC DOS
are registered trademarks of Microsoft Corporation.
WD1002A-27X
USER GUIDE
Introduction
The WD1002A-27X controller is designed for use with RLL type hard
disk drives only. Consult your drive manual or contact the drive
manufacturer to determine that your drive type is RLL compatible.
The WD1002A-27X is an easy to install, RLL controller, which
interfaces either one or two Winchester disk drives to a single host
computer. It is to be used as the primary hard disk controller in
IBM PC XT or compatible systems.
Installation of the controller requires three steps: 1) Verifying
jumper settings; 2) installing into the host computer; 3) formatting
the hard disk drives. To complete installation you will need the
following:
Two hard disk cables (3 if using 2 hard disk drives); RLL drive;
screwdriver; MSDOS Version 2.0 or later; *DEBUG utility; *FDISK
utility; *Format utility (*normally included with MSDOS)
Preparation of Controller
WARNING
HANDLE THE CONTROLLER BY THE ENDS OF THE BOARD
SOME OF THE CHIPS ARE STATIC SENSITIVE AND DAMAGE
MAY OCCUR IF THE BOARD IS INCORRECTLY HANDLED
Before you can install your WD1002A-27X you will need to be certain
that the jumpers (small shorting plugs) located at position W1 and W2
are correctly set. There are only two possible settings, both ON or
both OFF.
┌────────Drive 0───────────────────────────┐
│ ┌J4┐ Data Cable 34pin Control Cable │
│ └──┘ ┌──J2──┐ ┌──────J1───────┐ │
│ LED └──────┘ └───────────────┘ │
│ ┌──J3──┐ │
│ └──────┘ │
│ Drive 1 │
│ Data Cable │
│ │
│ ┌W2─┐ │
│ │───│ │
│ └W1─┘ │
│ │
│ ┌─BIOS──┐ │
│ │ ( │
│ └───U8──┘ │
│ │
└───────┐ ┌───────┘
│ WD1002A-27X │
└┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘
Before setting the jumpers, you will need to know the parameters of
your RLL drive. For your convenience, we have provided a list of the
most common drives. You may access the list by returning to the
previous menu. If your drive has 4 heads, a formatted capacity of
32 megabytes, and fewer than 663 cylinders, the controller jumper
settings (W1 and W2) should be (ON).
Note: Some versions of DOS or other operating systems will not
recognize the 26 sector per track feature of RLL drives. Jumpers ON
translates the configuration characteristics into a 17 sector per
track format recognized by the Operating System.
WITH JUMPER SETTINGS ON, YOU MAY USE THE SIMPLIFIED FORMATTING
INSTRUCTIONS ON PAGE 4.
DRIVES WITH GREATER THAN 663 CYLINDERS
If your drive has more than 663 cylinders, jumpers must be OFF and
you must use the Dynamic Formatting procedure. (See page 7)
IF YOUR DRIVE IS NOT LISTED, YOU WILL NEED TO OBTAIN THE PARAMETERS
FROM YOUR DRIVE MANUFACTURER OR MANUAL.
Preparation of Drive
WARNING
MAKE SURE COMPUTER IS TURNED OFF
AND POWER IS DISCONNECTED
There are 3 steps in preparing your drive to interface with the
WD1002A-27X Controller.
1) Power for drive is supplied by host computer through an extra
connector from its power supply. Verify that the host computer
contains a 135 watt power supply.
2) The terminating resistor must be present only on the last hard
disk drive connected. If there are two drives, the terminating
resistor must be present on the second drive.
3) Drive Select: If the controller cable has a twisted portion
between two drive connectors, both drives must be jumpered for Drive
Select 2. If controller cable has no twisted portion, first drive
select should be 1, second drive select 2.
See your drive manual for drive preparation and installation
procedures.
Note: The hard disk drive cable is not the same cable used for
floppy disk drives.
Installation Into Host Computer
WARNING
MAKE SURE COMPUTER IS TURNED OFF
AND POWER IS DISCONNECTED
Installation of Controller into Host Computer
Remove blank expansion slot bracket and save for future use. The
screw will be used to hold the controller board into place.
INSTALL CONTROLLER INTO ANY AVAILABLE SLOT EXCEPT SLOT 8
Connect the 34-pin (wide control cable) connector to J1 on the
controller board. Make sure that Pin 1 of the cable connector goes
to Pin 1 on the controller board. Pin 1 of the cable connector is
typically located on the color coded side of the cable.
Connect the 20-pin (data cable) to J2 (Drive 0 Data Connector) on the
controller board. Make sure that Pin 1 on the cable is connected to
Pin 1 on the controller board.
If a second drive is being installed, connect the Drive 1 data cable
to J3.
Verify that the disk drive(s) is(are) installed properly. This
includes correct placement of drive select jumpers and drive
terminator installation. Refer to the disk drive installation manual
for further information. DO NOT USE THE RADIAL SELECT OPTION.
Install the drive(s) per manufacturer's instructions.
CAUTION
WHEN ROUTING CABLES, BE CAREFUL NOT TO PINCH
THEM. CABLES MUST NOT GET CAUGHT BETWEEN THE
COVER AND THE BOARDS, NOR SHOULD THEY OBSTRUCT
ANY AIR FLOW PATH FROM FANS OR VENTS.