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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
and Xenix are registered trademarks of Microsoft Corporation.
WD1007A-WAH
User Guide
The WD1007A-WAH controller is designed to interface with up to two
ESDI compatible hard disk drives in an IBM PC AT or compatible
system. The ESDI drives used with this controller generally have two
modes of operation, soft sector and hard sector. At this time, the
WD1007A-WAH offers only the hard sector mode of operation.
There are two versions of the WD1007A-WAH available. Feature 1
(F001) has the WD1007A BIOS which will allow low level formatting of
ESDI type drives using DOS. The Feature 0 (F000) does not have the
BIOS and will work with AT type systems which have ESDI parameters in
the system BIOS or for use with the Novell operating system.
NOTE
DO NOT USE THE WD1007A-WAH WITH MFM TYPE HARD DISK DRIVES
USE ONLY WITH ESDI HARD DISK DRIVES
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); ESDI hard disk
drive; screwdriver; MSDOS Version 3.3 or later; WD1007A BIOS or WDFMT
2.10 formatting utility; FDISK (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 WD1007A-WAH, you will need to be certain
that the jumpers (small shorting plugs) are correctly set. Refer to
Table 1 for correct jumper settings. Modification of factory jumper
settings is rarely necessary. Modify jumpers only under the
direction of a qualified individual; i.e. your dealer.
┌──────────────────────────────────────────────────────────────────┐
│ ┌J4─────────────┐ ┌J3────────┐ ┌J2─Drive 0 ┌J1─Control───┐ │
│ └───────────────┘ └──────────┘ └─────────┘ └─────────────┘ │
│W13∙∙∙ ┌J ∙∙∙W7 ∙∙∙W14 │
│ │5 ∙∙∙W15 │
│ └┘ ∙∙∙W5 ∙∙∙W8 │
│ ∙∙∙W6 W2∙∙∙ ∙∙∙W12 ∙∙∙W9 │
│ ∙∙∙W4 W1∙∙∙ ∙∙∙W11 │
│ WD1007A-WAH ∙∙∙W10 │
└───────────┐ P2 ┌──┐ P1 ∙∙∙W3 ┌───┘
└┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘
Table 1
Jumper Position Function
W1 2-3 Standard: BIOS Address Select (C8000-09FFF)
W2 2-3
W3 Jumper Enables BIOS
W1 2-3 BIOS Address Select (CA000-CBFFF)
W2 1-2
W3 Jumper Enables BIOS
W1 1-2 BIOS Address Select (CC000-CDFFF)
W2 2-3
W3 Jumper Enables BIOS
W1 1-2 BIOS Address Select (CE000-CFFFF)
W2 1-2
W3 Jumper Enables BIOS
W8 No Jumper Standard: WD1007 Mode. Firmware forces a
10 MHz ESDI drive to 35 sectors per track
when using the Set Unformatted Bytes per
Sector command. This mode supports a 1:1
interleave.
W8 Jumper Allows the WD1007A-WAH to be used as a
replacement board for the WD1005-WAH without
reformatting the drive. The controller
reads the Unformatted Bytes Per Sector from
the drive.
W9 No Jumper Standard: Chassis Ground Disconnected
W10 No Jumper Standard: Digital Input Register Unlatched
W11 No Jumper Standard: Diskette Change Enable w/FDC
Option
W12 No Jumper Standard: Secondary Address Select (1FX)
W14 No Jumper Standard: Sector Translation Enabled
Provides physical to logical translation**
W14 Jumper Physical to logical translation disabled.
W15 No Jumper Standard: 4 Bytes ECC
W15 Jumper 7 Bytes ECC
**Because some of the older operating systems can only recognize 17
sectors per track or a maximum of 1048 cylinders per drive, the
WD1007A-WAH provides a translation scheme so that ESDI hard disk
drives with 34-36 sector mode operation can be fully utilized in a PC
AT.
Hardware Installation
WARNING
MAKE SURE COMPUTER IS TURNED OFF
AND POWER IS DISCONNECTED
1. Verify that your host computer has a at least a 200 watt power
supply. If the disk drive(s) is(are) being installed internally, it
is best to locate the controller in the nearest available expansion
slot to the drive.
2. Remove the blank expansion slot bracket. Put the bracket away
and save it for possible future use. The screw will be used to hold
the new controller in place.
3. 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. Verify proper setting
of drive select switches for drive select 1 or 2. Refer to your
system owner's manual for information about proper drive termination
and select switches. Do not use the Radial Select Option on your
drive.
4. Attach 34-pin control connector pin 1 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.
5. Connect control cable to drive (s).
6. Attach 20-pin data connector to J2 (Drive C or 0).
7. Attach 20-pin data connector to J3 (Drive D or 1).
8. Connect data cables to drives.
9. Attach Winchester activity LED connector to J5.
10. Install controller board into the expansion slot. Make sure that
the board is seated properly by pressing down on both ends of the
board. Secure the board with the bracket screw.
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.