Western Digital WD1007A-WAH, WD1007A-WA2 USER’S GUIDE
USER’S GUIDE
WD1007A-WAH/WA2
Winchester/Floppy
Disk Controller
Important Information
Do Not Discard
1.0 Document Scope
This document describes installation of the WDl007A-WAH/WA2 Winchester/Floppy
Disk Controller in the IBM* Personal Computer AT*. If you have an AT compatible,
you should refer to your system manuals or contact your dealer for information
concerning installation of the WDl007A-WAH/WA2. Refer to the fol lowing docum ents
for a more thorough explanation of board functions:
• WDl007A-WAH/WA2 Data Sheet (79-000261)
• WDl007A-WAH/WA2 Application Notes
• WDl007A Support Diskette (Contact your local sales office)
2.0 Description
The WDl007A-WA2 and the WDl007A-WAH are single board Winchester Disk
Controllers designed to interface two ESDI compatible disk drives to the IBM PC/AT or
compatible host computer. The WDl007A-WA2 supports two 5.25 or 3.5 inch floppy
disk drives; the WDl007A-WAH is a hard disk only version of the controller.
The ESDI drives used with this controller generally have two modes of operation, soft
sector and hard sector. At this time the WDl007A-WA2 offers only the hard sector mode
of operation.
In most systems the BIOS and/or operating system supports only the older MFM/ ST -506
drives which use 17 sectors per track. The ESDI disk drive typically has 34 sectors per
track when operating in the hard sector mode. To integrate the hard disk drive into the
AT environment, select a drive parameters table that reflects the physical characteristics
of the drive, i.e., the number of cylinders, heads, and sectors per track.
The WDl007A-WAH/WA2 controller has an optional BIOS ROM that provides drive
parameter tables, low-level formatting routines, and surface analysis routines. While
low-level formatting of the drive can be accomplished by several means, Western
Digital recommends that you use the low-level formatting routine present in the
WDl007A BIOS. If your controller does not have the BIOS option, obtain Western
Digital's WDFMT 2.10 formatting utility.
(*) IBM and AT are registered trademarks of International Business Machines Corporation.
3.0 Hardware Installation Instructions
This section briefly describes installation of the WDl007A-WA2. If you wish to install
the disk drive internally, it is best to locate the controller in the closest available
expansion slot relative to the drive. The WDl007A controller can be installed in any 16bit slot in the IBM PC-AT or compatible host computer. Connecting cables for the ESDI
hard disk are the same as those used on ST506 type drives. Device ID jumpers are
implemented on the ESDI device just as with an ST506 drive. Verify that the drive is
configured to support the hard sector mode.
CAUTION
Handle the controller board by the ends of the board. Some of the chips are static
sensitive and damage may occur if the board is incorrectly handled.
1. Verify the controller jumper settings. Modification of the standard factor settings on
the controller is rarely necessary. Modify the jumpers only under the direction of a
qualified individual; i.e., your dealer. Figure 1 illustrates the jumper locations. Table 1
lists the jumper default settings for the WDl007A-WA2 and the WDl007A-WAH.
Table 2 provides the various address select ranges and corresponding jumper settings.
The WDlOO7A-WAH can be used as a field replacement board for existing
WD1005WAH boards without reformatting the hard disk drive. The WDl005WAH
firmware does not recognize the Set Unformatted Bytes per Sector command, so you
must set jumper/switches on the drive to the desired sectors per track. Substituting the
WD1007A-WAH board and installing a jumper at W8 precludes the use of the Set
Unformatted Bytes/Sector command. When in the WDl007A-WA2 mode (no jumpe r on
W8), the E SDI drive is forced t o 35 sectors per track by t he Set Unformatted Bytes per
Sector command. The interleave ratio is 1:1.
2. Remove or disable any other floppy controller in your system if you are installing the
WDl007A-WA2.
3. Verify termination of the last hard disk drive. Verify proper setting of drive select
switches on the drive, if necessary. Do NOT use the drive's radial select option. Refer to
the drive owner's manual for information about proper drive termination and select
switches.
4. Remove the blank expansion slot bracket. Put the bracket away and save it for
possible future use. The bracket screw will be used to hold the controller board in place.
5. Connect the 34-pin control cable to Jl connector. Keyed connectors prevent reversal
of the cables.
6. Connect the control cable to the hard disk drive(s).
7. Attach a 20-pin data cable to J2 connector (for Drive 0).
8. Attach a 20-pin data cable to J3 connector (for Drive 1).
9. Connect the cable(s) to the proper hard disk drive(s).
10. Attach the 34-pin daisy-chain cable to J4 connector.
11. Connect the cable to the floppy drive(s).
12. Attach Winchester activity LED connector to J5.
13. Install the controller board into the expansion slot. Ensure that the board is seated
properly by pressing down on both ends of the board. Secure the board with the bracket
screw.
FIGURE 1. CONTROLLER MODULE LAYOUT
TABLE 1. JUMPER DEFAULT SETTINGS
JUMPER FUNCTION
BIOS Address Select (C8000-09FFF) W1 2-3 WI 2-3
BIOS Address Select W2 2-3 W2 2-3
BIOS Shadow RAM Enabled W3 Jumper W3 Jumper
Floppy Controller Enabled W4 No Jumper
Single Spindle Speed Selected W5 No Jumper
Floppy Address Select (3FX) W6 2-3
Floppy Drive Select W7 1-2
WD1007 Mode W8 No Jumper W8 No Jumper
Chassis Ground Disconnected W9 No Jumper W9 No Jumper
Digital Input Register Unlatched W10 No Jumper W10 No Jumper
Diskette Change Enable with FDC Option W11 Jumper W11 No Jumper
Secondary Address Select (1 FX) W12 No Jumper W12 No Jumper
Floppy Controller Enabled - In Etch W13 Uncut
Sector Translation Enabled W14 No Jumper W14 No Jumper
ECC Length Select (4 Bytes) W15 No Jumper W15 No Jumper
WDl007A-WA2 WDlOO7A-WAH
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